diff --git a/applications/app-loader/app-loader.c b/applications/app-loader/app-loader.c
index bc170e85..a01f9835 100644
--- a/applications/app-loader/app-loader.c
+++ b/applications/app-loader/app-loader.c
@@ -7,12 +7,12 @@
 typedef struct {
     FuriApp* handler;
     Widget* widget;
-    FlipperStartupApp* current_app;
+    const FlipperStartupApp* current_app;
 } AppLoaderState;
 
 typedef struct {
     AppLoaderState* state;
-    FlipperStartupApp* app;
+    const FlipperStartupApp* app;
 } AppLoaderContext;
 
 // TODO add mutex for contex
diff --git a/applications/cc1101-workaround/cc1101-workaround.cpp b/applications/cc1101-workaround/cc1101-workaround.cpp
index b794bd23..03556fa1 100644
--- a/applications/cc1101-workaround/cc1101-workaround.cpp
+++ b/applications/cc1101-workaround/cc1101-workaround.cpp
@@ -54,7 +54,7 @@ void setup_freq(CC1101* cc1101, const FreqConfig* config) {
 int16_t rx_rssi(CC1101* cc1101, const FreqConfig* config) {
     cc1101->SetReceive();
 
-    delayMicroseconds(RSSI_DELAY);
+    delay_us(RSSI_DELAY);
 
     // 1.4.8) read PKTSTATUS register while the radio is in RX state
     /*uint8_t _pkt_status = */ cc1101->SpiReadStatus(CC1101_PKTSTATUS);
@@ -262,7 +262,7 @@ extern "C" void cc1101_workaround(void* p) {
     GpioPin* led_record = &led;
 
     // configure pin
-    pinMode(led_record, GpioModeOutputOpenDrain);
+    gpio_init(led_record, GpioModeOutputOpenDrain);
 
     const int16_t RSSI_THRESHOLD = -89;
 
@@ -327,9 +327,9 @@ extern "C" void cc1101_workaround(void* p) {
             state->need_cc1101_conf = false;
         }
 
-        digitalWrite(
+        gpio_write(
             led_record,
-            (state->last_rssi > RSSI_THRESHOLD && !state->need_cc1101_conf) ? LOW : HIGH);
+            (state->last_rssi > RSSI_THRESHOLD && !state->need_cc1101_conf) ? false : true);
 
         release_mutex(&state_mutex, state);
         widget_update(widget);
diff --git a/applications/cc1101-workaround/cc1101.cpp b/applications/cc1101-workaround/cc1101.cpp
index 279e1256..1feae6b1 100644
--- a/applications/cc1101-workaround/cc1101.cpp
+++ b/applications/cc1101-workaround/cc1101.cpp
@@ -17,7 +17,7 @@ CC1101::CC1101(GpioPin* ss_pin) {
     pinMode(gdo0_pin, OUTPUT); //GDO0 as asynchronous serial mode input
     pinMode(gdo2_pin, INPUT); //GDO2 as asynchronous serial mode output
     */
-    pinMode(ss_pin, OUTPUT);
+    gpio_init(ss_pin, GpioModeOutputPushPull);
     this->ss_pin = ss_pin;
 
     // TODO open record
@@ -79,9 +79,9 @@ Function: SpiMode
                (1<<CPOL) | (1 << CPHA)       3
 *OUTPUT       :none
 ******************************************************************************/
-void CC1101::SpiMode(byte config) {
+void CC1101::SpiMode(uint8_t config) {
     /*
-  byte tmp;
+  uint8_t tmp;
   // enable SPI master with configuration byte specified
   SPCR = 0;
   SPCR = (config & 0x7F) | (1<<SPE) | (1<<MSTR);
@@ -95,7 +95,7 @@ void CC1101::SpiMode(byte config) {
 *INPUT        :value: data to send
 *OUTPUT       :data to receive
 ****************************************************************/
-byte CC1101::SpiTransfer(byte value) {
+uint8_t CC1101::SpiTransfer(uint8_t value) {
     uint8_t buf[1] = {value};
     uint8_t rxbuf[1] = {0};
 
@@ -110,13 +110,13 @@ byte CC1101::SpiTransfer(byte value) {
 *INPUT        :addr: register address; value: register value
 *OUTPUT       :none
 ****************************************************************/
-void CC1101::SpiWriteReg(byte addr, byte value) {
-    digitalWrite(ss_pin, LOW);
-    while(digitalRead(this->miso_pin_record))
+void CC1101::SpiWriteReg(uint8_t addr, uint8_t value) {
+    gpio_write(ss_pin, false);
+    while(gpio_read(this->miso_pin_record))
         ;
     SpiTransfer(addr);
     SpiTransfer(value);
-    digitalWrite(ss_pin, HIGH);
+    gpio_write(ss_pin, true);
 }
 
 /****************************************************************
@@ -125,18 +125,18 @@ void CC1101::SpiWriteReg(byte addr, byte value) {
 *INPUT        :addr: register address; buffer:register value array; num:number to write
 *OUTPUT       :none
 ****************************************************************/
-void CC1101::SpiWriteBurstReg(byte addr, byte* buffer, byte num) {
-    byte i, temp;
+void CC1101::SpiWriteBurstReg(uint8_t addr, uint8_t* buffer, uint8_t num) {
+    uint8_t i, temp;
 
     temp = addr | WRITE_BURST;
-    digitalWrite(ss_pin, LOW);
-    while(digitalRead(this->miso_pin_record))
+    gpio_write(ss_pin, false);
+    while(gpio_read(this->miso_pin_record))
         ;
     SpiTransfer(temp);
     for(i = 0; i < num; i++) {
         SpiTransfer(buffer[i]);
     }
-    digitalWrite(ss_pin, HIGH);
+    gpio_write(ss_pin, true);
 }
 
 /****************************************************************
@@ -145,12 +145,12 @@ void CC1101::SpiWriteBurstReg(byte addr, byte* buffer, byte num) {
 *INPUT        :strobe: command; //refer define in CC1101.h//
 *OUTPUT       :none
 ****************************************************************/
-void CC1101::SpiStrobe(byte strobe) {
-    digitalWrite(ss_pin, LOW);
-    while(digitalRead(this->miso_pin_record))
+void CC1101::SpiStrobe(uint8_t strobe) {
+    gpio_write(ss_pin, false);
+    while(gpio_read(this->miso_pin_record))
         ;
     SpiTransfer(strobe);
-    digitalWrite(ss_pin, HIGH);
+    gpio_write(ss_pin, true);
 }
 
 /****************************************************************
@@ -159,16 +159,16 @@ void CC1101::SpiStrobe(byte strobe) {
 *INPUT        :addr: register address
 *OUTPUT       :register value
 ****************************************************************/
-byte CC1101::SpiReadReg(byte addr) {
-    byte temp, value;
+uint8_t CC1101::SpiReadReg(uint8_t addr) {
+    uint8_t temp, value;
 
     temp = addr | READ_SINGLE;
-    digitalWrite(ss_pin, LOW);
-    while(digitalRead(this->miso_pin_record))
+    gpio_write(ss_pin, false);
+    while(gpio_read(this->miso_pin_record))
         ;
     SpiTransfer(temp);
     value = SpiTransfer(0);
-    digitalWrite(ss_pin, HIGH);
+    gpio_write(ss_pin, true);
 
     return value;
 }
@@ -179,18 +179,18 @@ byte CC1101::SpiReadReg(byte addr) {
 *INPUT        :addr: register address; buffer:array to store register value; num: number to read
 *OUTPUT       :none
 ****************************************************************/
-void CC1101::SpiReadBurstReg(byte addr, byte* buffer, byte num) {
-    byte i, temp;
+void CC1101::SpiReadBurstReg(uint8_t addr, uint8_t* buffer, uint8_t num) {
+    uint8_t i, temp;
 
     temp = addr | READ_BURST;
-    digitalWrite(ss_pin, LOW);
-    while(digitalRead(this->miso_pin_record))
+    gpio_write(ss_pin, false);
+    while(gpio_read(this->miso_pin_record))
         ;
     SpiTransfer(temp);
     for(i = 0; i < num; i++) {
         buffer[i] = SpiTransfer(0);
     }
-    digitalWrite(ss_pin, HIGH);
+    gpio_write(ss_pin, true);
 }
 
 /****************************************************************
@@ -199,16 +199,16 @@ void CC1101::SpiReadBurstReg(byte addr, byte* buffer, byte num) {
 *INPUT        :addr: register address
 *OUTPUT       :status value
 ****************************************************************/
-byte CC1101::SpiReadStatus(byte addr) {
-    byte value, temp;
+uint8_t CC1101::SpiReadStatus(uint8_t addr) {
+    uint8_t value, temp;
 
     temp = addr | READ_BURST;
-    digitalWrite(ss_pin, LOW);
-    while(digitalRead(this->miso_pin_record))
+    gpio_write(ss_pin, false);
+    while(gpio_read(this->miso_pin_record))
         ;
     SpiTransfer(temp);
     value = SpiTransfer(0);
-    digitalWrite(ss_pin, HIGH);
+    gpio_write(ss_pin, true);
 
     return value;
 }
@@ -220,17 +220,17 @@ byte CC1101::SpiReadStatus(byte addr) {
 *OUTPUT       :none
 ****************************************************************/
 void CC1101::Reset(void) {
-    digitalWrite(ss_pin, LOW);
+    gpio_write(ss_pin, false);
     delay(1);
-    digitalWrite(ss_pin, HIGH);
+    gpio_write(ss_pin, true);
     delay(1);
-    digitalWrite(ss_pin, LOW);
-    while(digitalRead(this->miso_pin_record))
+    gpio_write(ss_pin, false);
+    while(gpio_read(this->miso_pin_record))
         ;
     SpiTransfer(CC1101_SRES);
-    while(digitalRead(this->miso_pin_record))
+    while(gpio_read(this->miso_pin_record))
         ;
-    digitalWrite(ss_pin, HIGH);
+    gpio_write(ss_pin, true);
 }
 /****************************************************************
 *FUNCTION NAME:Init
@@ -238,20 +238,21 @@ void CC1101::Reset(void) {
 *INPUT        :none
 *OUTPUT       :none
 ****************************************************************/
-byte CC1101::Init(void) {
+uint8_t CC1101::Init(void) {
 #ifdef CC1101_DEBUG
     printf("Init SPI...\n");
 #endif
     SpiInit(); //spi initialization
-    digitalWrite(ss_pin, HIGH);
-// digitalWrite(SCK_PIN, HIGH);
-// digitalWrite(MOSI_PIN, LOW);
+    gpio_write(ss_pin, true);
+// gpio_write(SCK_PIN, true);
+// gpio_write(MOSI_PIN, false);
 #ifdef CC1101_DEBUG
     printf("Reset CC1101...\n");
 #endif
     Reset(); //CC1101 reset
 
-    byte partnum, version;
+    uint8_t partnum __attribute__((unused));
+    uint8_t version;
     partnum = SpiReadStatus(CC1101_PARTNUM);
     version = SpiReadStatus(CC1101_VERSION);
 
@@ -277,15 +278,15 @@ byte CC1101::Init(void) {
 *INPUT        :byte mode
 *OUTPUT       :none
 ****************************************************************/
-void CC1101::SetMod(byte mode) {
+void CC1101::SetMod(uint8_t mode) {
     SpiWriteReg(CC1101_MDMCFG2, mode); //no sync/preamble; ASK/OOK only support up to -1dbm
     if((mode | 0x30) == ASK) {
         SpiWriteReg(CC1101_FREND0, 0x11); //use first up to PATABLE(0)
-        byte PaTabel[8] = {0x00, POWER, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
+        uint8_t PaTabel[8] = {0x00, POWER, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
         SpiWriteBurstReg(CC1101_PATABLE, PaTabel, 8); //CC1101 PATABLE config
     } else {
         SpiWriteReg(CC1101_FREND0, 0x10); //use first up to PATABLE(0)
-        byte PaTabel[8] = {POWER, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
+        uint8_t PaTabel[8] = {POWER, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
         SpiWriteBurstReg(CC1101_PATABLE, PaTabel, 8); //CC1101 PATABLE config
     }
 
@@ -377,7 +378,7 @@ void CC1101::RegConfigSettings(void) {
  *INPUT        :Freq2, Freq1, Freq0
  *OUTPUT       :none
  ****************************************************************/
-void CC1101::SetFreq(byte freq2, byte freq1, byte freq0) {
+void CC1101::SetFreq(uint8_t freq2, uint8_t freq1, uint8_t freq0) {
     SpiWriteReg(CC1101_FREQ2, freq2);
     SpiWriteReg(CC1101_FREQ1, freq1);
     SpiWriteReg(CC1101_FREQ0, freq0);
@@ -392,7 +393,7 @@ void CC1101::SetChannel(int channel) {
 #ifdef CC1101_DEBUG
     printf("Set CC1101 channel to: %d \n", channel);
 #endif
-    SpiWriteReg(CC1101_CHANNR, (byte)channel); //related to channel numbers
+    SpiWriteReg(CC1101_CHANNR, (uint8_t)channel); //related to channel numbers
 }
 /****************************************************************
  *FUNCTION NAME:SetReceive
diff --git a/applications/cc1101-workaround/cc1101.h b/applications/cc1101-workaround/cc1101.h
index 862e4525..aa4b7cfe 100644
--- a/applications/cc1101-workaround/cc1101.h
+++ b/applications/cc1101-workaround/cc1101.h
@@ -143,25 +143,25 @@ private:
     GpioPin* gdo2_pin;
 
 private:
-    void SpiMode(byte config);
-    byte SpiTransfer(byte value);
+    void SpiMode(uint8_t config);
+    uint8_t SpiTransfer(uint8_t value);
     void Reset(void);
-    void SpiWriteBurstReg(byte addr, byte* buffer, byte num);
-    byte SpiReadReg(byte addr);
-    void SpiReadBurstReg(byte addr, byte* buffer, byte num);
+    void SpiWriteBurstReg(uint8_t addr, uint8_t* buffer, uint8_t num);
+    uint8_t SpiReadReg(uint8_t addr);
+    void SpiReadBurstReg(uint8_t addr, uint8_t* buffer, uint8_t num);
     void RegConfigSettings(void);
 
 public:
     CC1101(GpioPin* ss_pin);
 
-    void SpiWriteReg(byte addr, byte value);
+    void SpiWriteReg(uint8_t addr, uint8_t value);
     void SpiInit(void);
     void SpiEnd(void);
-    void SetMod(byte mode);
-    void SetFreq(byte Freq2, byte Freq1, byte Freq0);
-    byte Init(void);
-    void SpiStrobe(byte strobe);
-    byte SpiReadStatus(byte addr);
+    void SetMod(uint8_t mode);
+    void SetFreq(uint8_t Freq2, uint8_t Freq1, uint8_t Freq0);
+    uint8_t Init(void);
+    void SpiStrobe(uint8_t strobe);
+    uint8_t SpiReadStatus(uint8_t addr);
     void SetReceive(void);
     void SetTransmit(void);
     void SetChannel(int channel);
diff --git a/applications/examples/blink.c b/applications/examples/blink.c
index 195a13cf..abd0dd1c 100644
--- a/applications/examples/blink.c
+++ b/applications/examples/blink.c
@@ -9,12 +9,12 @@ void application_blink(void* p) {
     GpioPin* led_record = &led;
 
     // configure pin
-    pinMode(led_record, GpioModeOutputOpenDrain);
+    gpio_init(led_record, GpioModeOutputOpenDrain);
 
     while(1) {
-        digitalWrite(led_record, HIGH);
+        gpio_write(led_record, true);
         delay(500);
-        digitalWrite(led_record, LOW);
+        gpio_write(led_record, false);
         delay(500);
     }
 }
\ No newline at end of file
diff --git a/applications/examples/fatfs_list.c b/applications/examples/fatfs_list.c
index de24124c..afb7fd63 100644
--- a/applications/examples/fatfs_list.c
+++ b/applications/examples/fatfs_list.c
@@ -3,6 +3,8 @@
 #include "flipper_v2.h"
 #include <stdio.h>
 
+extern uint8_t BSP_SD_Init();
+
 // TODO currently we have small stack, so it will be static
 FuriRecordSubscriber* furi_log;
 #define STR_BUFFER_SIZE 128
@@ -72,8 +74,6 @@ void fatfs_list(void* p) {
     u8g2_ClearBuffer(fb);
     furi_commit(fb_record);
 
-    // TODO these lines should be executed in the target driver
-    // so i dont fix "implicit declaration of function 'BSP_SD_Init'"
     bsp_result = BSP_SD_Init();
 
     if(bsp_result != 0) {
diff --git a/applications/examples/input_dump.c b/applications/examples/input_dump.c
index ce740d9c..fc794620 100644
--- a/applications/examples/input_dump.c
+++ b/applications/examples/input_dump.c
@@ -1,10 +1,16 @@
 #include "flipper_v2.h"
 #include <stdio.h>
 
-static void state_cb(const void* value, void* ctx) {
-    const InputState* state = value;
+typedef union {
+    unsigned int packed;
+    InputState state;
+} InputDump;
 
-    printf("state: %02x\n", *state);
+static void state_cb(const void* value, void* ctx) {
+    InputDump dump = {.packed = 0};
+    dump.state = *(InputState*)value;
+
+    printf("state: %02x\n", dump.packed);
 }
 
 static void event_cb(const void* value, void* ctx) {
diff --git a/applications/examples/uart_write.c b/applications/examples/uart_write.c
index 95d6ec49..217b1563 100644
--- a/applications/examples/uart_write.c
+++ b/applications/examples/uart_write.c
@@ -9,7 +9,7 @@ void application_uart_write(void* p) {
     // TODO open record
     GpioPin* led_record = &led;
 
-    pinMode(led_record, GpioModeOutputOpenDrain);
+    gpio_init(led_record, GpioModeOutputOpenDrain);
 
     // get_default_log open "tty" record
     FuriRecordSubscriber* log = get_default_log();
@@ -27,9 +27,9 @@ void application_uart_write(void* p) {
         counter++;
 
         // flash at every send
-        digitalWrite(led_record, LOW);
+        gpio_write(led_record, false);
         delay(50);
-        digitalWrite(led_record, HIGH);
+        gpio_write(led_record, true);
 
         // delay with overall perion of 1s
         delay(950);
diff --git a/applications/irda/irda.c b/applications/irda/irda.c
index 13747ef4..9dd8fec2 100644
--- a/applications/irda/irda.c
+++ b/applications/irda/irda.c
@@ -80,12 +80,10 @@ void render_carrier(CanvasApi* canvas, State* state) {
     canvas->draw_str(canvas, 2, 37, "? /\\ freq | \\/ duty cycle");
     {
         char buf[24];
-        sprintf(buf, "frequency: %d Hz", state->carrier_freq);
+        sprintf(buf, "frequency: %u Hz", state->carrier_freq);
         canvas->draw_str(canvas, 2, 50, buf);
         sprintf(
-            buf,
-            "duty cycle: %d/1000",
-            (uint32_t)(duty_cycles[state->carrier_duty_cycle_id] * 1000));
+            buf, "duty cycle: %d/1000", (int)(duty_cycles[state->carrier_duty_cycle_id] * 1000));
         canvas->draw_str(canvas, 2, 62, buf);
     }
 }
diff --git a/applications/lf-rfid/lf-rfid.c b/applications/lf-rfid/lf-rfid.c
index 48115de1..cc7f6253 100644
--- a/applications/lf-rfid/lf-rfid.c
+++ b/applications/lf-rfid/lf-rfid.c
@@ -28,7 +28,7 @@ static void render_callback(CanvasApi* canvas, void* ctx) {
 
     canvas->draw_str(canvas, 2, 24, state->on ? "ON" : "OFF");
     char buf[12];
-    sprintf(buf, "%d kHz", state->freq_khz);
+    sprintf(buf, "%d kHz", (int)state->freq_khz);
     canvas->draw_str(canvas, 2, 36, buf);
 
     release_mutex((ValueMutex*)ctx, state);
diff --git a/applications/nfc/nfc.c b/applications/nfc/nfc.c
index a87bf240..e5fe8908 100644
--- a/applications/nfc/nfc.c
+++ b/applications/nfc/nfc.c
@@ -15,6 +15,8 @@
 #include <rfal_nfc.h>
 #include <rfal_nfca.h>
 
+#include <st25r3916_irq.h>
+
 #include "dispatcher.h"
 
 typedef enum {
diff --git a/applications/power/power.c b/applications/power/power.c
index 36804a16..665e9881 100644
--- a/applications/power/power.c
+++ b/applications/power/power.c
@@ -46,7 +46,7 @@ void power_draw_battery_callback(CanvasApi* canvas, void* context) {
 void power_input_events_callback(const void* value, void* ctx) {
     assert(ctx);
     Power* power = ctx;
-    InputEvent* event = value;
+    const InputEvent* event = value;
 
     if(event->input != InputCharging) return;
 
@@ -63,7 +63,7 @@ Power* power_alloc() {
 
     ValueManager* input_state_manager = furi_open("input_state");
     InputState input_state;
-    read_mutex_block(input_state_manager, &input_state, sizeof(input_state));
+    read_mutex_block(&input_state_manager->value, &input_state, sizeof(input_state));
     widget_enabled_set(power->usb_widget, input_state.charging);
 
     widget_draw_callback_set(power->usb_widget, power_draw_usb_callback, power);
diff --git a/applications/tests/furi_event_test.c b/applications/tests/furi_event_test.c
index f6b9a5e0..2edb0af8 100644
--- a/applications/tests/furi_event_test.c
+++ b/applications/tests/furi_event_test.c
@@ -18,7 +18,8 @@ void test_furi_event() {
     mu_check(!wait_event_with_timeout(&event, 100));
 
     // Create second app
-    FuriApp* second_app = furiac_start(furi_concurent_app, "furi concurent app", (void*)&event);
+    FuriApp* second_app __attribute__((unused)) =
+        furiac_start(furi_concurent_app, "furi concurent app", (void*)&event);
 
     // The event should be signalled now
     mu_check(wait_event_with_timeout(&event, 100));
diff --git a/applications/tests/furi_pubsub_test.c b/applications/tests/furi_pubsub_test.c
index 4447f542..5d3a0a9e 100644
--- a/applications/tests/furi_pubsub_test.c
+++ b/applications/tests/furi_pubsub_test.c
@@ -12,7 +12,7 @@ const uint32_t notify_value_1 = 0x11223344;
 uint32_t pubsub_value = 0;
 uint32_t pubsub_context_value = 0;
 
-void test_pubsub_handler(void* arg, void* ctx) {
+void test_pubsub_handler(const void* arg, void* ctx) {
     pubsub_value = *(uint32_t*)arg;
     pubsub_context_value = *(uint32_t*)ctx;
 }
diff --git a/applications/tests/furi_value_expanders_test.c b/applications/tests/furi_value_expanders_test.c
index 8a795a4e..5d9a965c 100644
--- a/applications/tests/furi_value_expanders_test.c
+++ b/applications/tests/furi_value_expanders_test.c
@@ -112,7 +112,7 @@ static const uint32_t notify_value_1 = 0x11223344;
 
 static uint32_t pubsub_value = 0;
 
-void test_value_manager_handler(void* arg, void* ctx) {
+void test_value_manager_handler(const void* arg, void* ctx) {
     pubsub_value = *(uint32_t*)arg;
 }
 
diff --git a/applications/tests/minunit.h b/applications/tests/minunit.h
index e7caee40..466cf9c1 100644
--- a/applications/tests/minunit.h
+++ b/applications/tests/minunit.h
@@ -76,8 +76,8 @@ extern "C" {
 #include "minunit_vars_ex.h"
 
 /*  Test setup and teardown function pointers */
-static void (*minunit_setup)(void) = NULL;
-static void (*minunit_teardown)(void) = NULL;
+__attribute__((unused)) static void (*minunit_setup)(void) = NULL;
+__attribute__((unused)) static void (*minunit_teardown)(void) = NULL;
 
 /*  Definitions */
 #define MU_TEST(method_name) static void method_name(void)
@@ -457,7 +457,7 @@ static void (*minunit_teardown)(void) = NULL;
  * The returned real time is only useful for computing an elapsed time
  * between two calls to this function.
  */
-static double mu_timer_real(void) {
+__attribute__((unused)) static double mu_timer_real(void) {
 #if defined(_WIN32)
     /* Windows 2000 and later. ---------------------------------- */
     LARGE_INTEGER Time;
@@ -529,7 +529,7 @@ static double mu_timer_real(void) {
  * Returns the amount of CPU time used by the current process,
  * in seconds, or -1.0 if an error occurred.
  */
-static double mu_timer_cpu(void) {
+__attribute__((unused)) static double mu_timer_cpu(void) {
 #if defined(_WIN32)
     /* Windows -------------------------------------------------- */
     FILETIME createTime;
diff --git a/applications/tests/test_index.c b/applications/tests/test_index.c
index fc459336..133259fb 100644
--- a/applications/tests/test_index.c
+++ b/applications/tests/test_index.c
@@ -18,26 +18,26 @@ void flipper_test_app(void* p) {
     GpioPin* blue_record = &blue;
 
     // configure pins
-    pinMode(red_record, GpioModeOutputOpenDrain);
-    pinMode(green_record, GpioModeOutputOpenDrain);
-    pinMode(blue_record, GpioModeOutputOpenDrain);
+    gpio_init(red_record, GpioModeOutputOpenDrain);
+    gpio_init(green_record, GpioModeOutputOpenDrain);
+    gpio_init(blue_record, GpioModeOutputOpenDrain);
 
-    digitalWrite(red_record, HIGH);
-    digitalWrite(green_record, HIGH);
-    digitalWrite(blue_record, LOW);
+    gpio_write(red_record, true);
+    gpio_write(green_record, true);
+    gpio_write(blue_record, false);
 
     uint32_t exitcode = run_minunit();
 
     if(exitcode == 0) {
         // test passed
-        digitalWrite(red_record, HIGH);
-        digitalWrite(green_record, LOW);
-        digitalWrite(blue_record, HIGH);
+        gpio_write(red_record, true);
+        gpio_write(green_record, false);
+        gpio_write(blue_record, true);
     } else {
         // test failed
-        digitalWrite(red_record, LOW);
-        digitalWrite(green_record, HIGH);
-        digitalWrite(blue_record, HIGH);
+        gpio_write(red_record, false);
+        gpio_write(green_record, true);
+        gpio_write(blue_record, true);
     }
 
     set_exitcode(exitcode);
diff --git a/core/api-basic/pubsub.h b/core/api-basic/pubsub.h
index bc866a9f..1bd5bedc 100644
--- a/core/api-basic/pubsub.h
+++ b/core/api-basic/pubsub.h
@@ -12,7 +12,7 @@ and also subscriber can set `void*` context pointer that pass into
 callback (you can see callback signature below).
 */
 
-typedef void (*PubSubCallback)(void*, void*);
+typedef void (*PubSubCallback)(const void*, void*);
 typedef struct PubSubType PubSub;
 
 typedef struct {
diff --git a/core/api-hal/api-gpio.h b/core/api-hal/api-gpio.h
index e9176393..6c424f0b 100644
--- a/core/api-hal/api-gpio.h
+++ b/core/api-hal/api-gpio.h
@@ -23,7 +23,7 @@ static inline void gpio_write(GpioPin* gpio, bool state) {
 }
 
 // read value from GPIO, false = LOW, true = HIGH
-static inline bool gpio_read(GpioPin* gpio) {
+static inline bool gpio_read(const GpioPin* gpio) {
     return hal_gpio_read(gpio);
 }
 
diff --git a/core/flipper.h b/core/flipper.h
index a1dc6659..a76f10eb 100644
--- a/core/flipper.h
+++ b/core/flipper.h
@@ -17,7 +17,6 @@ extern "C" {
 #endif
 
 #include <stdio.h>
-#include "flipper_arduino.h"
 
 void set_exitcode(uint32_t _exitcode);
 
diff --git a/core/furi_ac.c b/core/furi_ac.c
index d4d87a01..592b68b5 100644
--- a/core/furi_ac.c
+++ b/core/furi_ac.c
@@ -1,4 +1,5 @@
 #include "flipper.h"
+#include "api-hal-task.h"
 
 // TODO: this file contains printf, that not implemented on uC target
 
diff --git a/firmware/Makefile b/firmware/Makefile
index 1562c735..dafd3af6 100644
--- a/firmware/Makefile
+++ b/firmware/Makefile
@@ -1,6 +1,9 @@
 PROJECT_ROOT	= $(abspath $(dir $(abspath $(firstword $(MAKEFILE_LIST))))..)
 PROJECT			= firmware
 
+CFLAGS += -Werror
+CPPFLAGS += -Werror
+
 include 		$(PROJECT_ROOT)/make/base.mk
 include			$(PROJECT_ROOT)/assets/assets.mk
 include			$(PROJECT_ROOT)/core/core.mk
diff --git a/firmware/targets/f2/Inc/usbd_conf.h b/firmware/targets/f2/Inc/usbd_conf.h
index 272ad1e8..a16cd92f 100644
--- a/firmware/targets/f2/Inc/usbd_conf.h
+++ b/firmware/targets/f2/Inc/usbd_conf.h
@@ -36,7 +36,8 @@
 #include "stm32l4xx_hal.h"
 
 /* USER CODE BEGIN INCLUDE */
-
+void *USBD_static_malloc(uint32_t size);
+void USBD_static_free(void* p);
 /* USER CODE END INCLUDE */
 
 /** @addtogroup USBD_OTG_DRIVER
diff --git a/firmware/targets/f2/Makefile b/firmware/targets/f2/Makefile
deleted file mode 100644
index e0bc903b..00000000
--- a/firmware/targets/f2/Makefile
+++ /dev/null
@@ -1,285 +0,0 @@
-##########################################################################################################################
-# File automatically-generated by tool: [projectgenerator] version: [3.10.0-B14] date: [Wed Oct 21 03:57:12 VLAT 2020] 
-##########################################################################################################################
-
-# ------------------------------------------------
-# Generic Makefile (based on gcc)
-#
-# ChangeLog :
-#	2017-02-10 - Several enhancements + project update mode
-#   2015-07-22 - first version
-# ------------------------------------------------
-
-######################################
-# target
-######################################
-TARGET = cube
-
-
-######################################
-# building variables
-######################################
-# debug build?
-DEBUG = 1
-# optimization
-OPT = -Og
-
-
-#######################################
-# paths
-#######################################
-# Build path
-BUILD_DIR = build
-
-######################################
-# source
-######################################
-# C sources
-C_SOURCES =  \
-Src/main.c \
-Src/gpio.c \
-Src/freertos.c \
-Src/adc.c \
-Src/comp.c \
-Src/spi.c \
-Src/tim.c \
-Src/usart.c \
-Src/usb_device.c \
-Src/usbd_conf.c \
-Src/usbd_desc.c \
-Src/usbd_cdc_if.c \
-Src/stm32l4xx_it.c \
-Src/stm32l4xx_hal_msp.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_pcd.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_pcd_ex.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_ll_usb.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_i2c.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_i2c_ex.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_rcc.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_rcc_ex.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_flash.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_flash_ex.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_flash_ramfunc.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_gpio.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_dma.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_dma_ex.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_pwr.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_pwr_ex.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_cortex.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_exti.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_adc.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_adc_ex.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_comp.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_spi.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_spi_ex.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_tim.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_tim_ex.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_uart.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_uart_ex.c \
-Src/system_stm32l4xx.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Middlewares/Third_Party/FreeRTOS/Source/croutine.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Middlewares/Third_Party/FreeRTOS/Source/event_groups.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Middlewares/Third_Party/FreeRTOS/Source/list.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Middlewares/Third_Party/FreeRTOS/Source/queue.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Middlewares/Third_Party/FreeRTOS/Source/stream_buffer.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Middlewares/Third_Party/FreeRTOS/Source/tasks.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Middlewares/Third_Party/FreeRTOS/Source/timers.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Middlewares/Third_Party/FreeRTOS/Source/CMSIS_RTOS_V2/cmsis_os2.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Middlewares/Third_Party/FreeRTOS/Source/portable/GCC/ARM_CM4F/port.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Middlewares/ST/STM32_USB_Device_Library/Core/Src/usbd_core.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Middlewares/ST/STM32_USB_Device_Library/Core/Src/usbd_ctlreq.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Middlewares/ST/STM32_USB_Device_Library/Core/Src/usbd_ioreq.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Middlewares/ST/STM32_USB_Device_Library/Class/CDC/Src/usbd_cdc.c \
-/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Middlewares/Third_Party/FreeRTOS/Source/portable/MemMang/heap_4.c \
-Src/stm32l4xx_hal_timebase_tim.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_pcd.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_pcd_ex.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_ll_usb.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_i2c.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_i2c_ex.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_rcc.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_rcc_ex.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_flash.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_flash_ex.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_flash_ramfunc.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_gpio.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_dma.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_dma_ex.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_pwr.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_pwr_ex.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_cortex.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_exti.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_adc.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_adc_ex.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_comp.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_spi.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_spi_ex.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_tim.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_tim_ex.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_uart.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_uart_ex.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Middlewares/Third_Party/FreeRTOS/Source/croutine.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Middlewares/Third_Party/FreeRTOS/Source/event_groups.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Middlewares/Third_Party/FreeRTOS/Source/list.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Middlewares/Third_Party/FreeRTOS/Source/queue.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Middlewares/Third_Party/FreeRTOS/Source/stream_buffer.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Middlewares/Third_Party/FreeRTOS/Source/tasks.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Middlewares/Third_Party/FreeRTOS/Source/timers.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Middlewares/Third_Party/FreeRTOS/Source/CMSIS_RTOS_V2/cmsis_os2.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Middlewares/Third_Party/FreeRTOS/Source/portable/MemMang/heap_4.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Middlewares/Third_Party/FreeRTOS/Source/portable/GCC/ARM_CM4F/port.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Middlewares/ST/STM32_USB_Device_Library/Core/Src/usbd_core.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Middlewares/ST/STM32_USB_Device_Library/Core/Src/usbd_ctlreq.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Middlewares/ST/STM32_USB_Device_Library/Core/Src/usbd_ioreq.c \
-C:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Middlewares/ST/STM32_USB_Device_Library/Class/CDC/Src/usbd_cdc.c
-
-# ASM sources
-ASM_SOURCES =  \
-startup_stm32l476xx.s
-
-
-#######################################
-# binaries
-#######################################
-PREFIX = arm-none-eabi-
-# The gcc compiler bin path can be either defined in make command via GCC_PATH variable (> make GCC_PATH=xxx)
-# either it can be added to the PATH environment variable.
-ifdef GCC_PATH
-CC = $(GCC_PATH)/$(PREFIX)gcc
-AS = $(GCC_PATH)/$(PREFIX)gcc -x assembler-with-cpp
-CP = $(GCC_PATH)/$(PREFIX)objcopy
-SZ = $(GCC_PATH)/$(PREFIX)size
-else
-CC = $(PREFIX)gcc
-AS = $(PREFIX)gcc -x assembler-with-cpp
-CP = $(PREFIX)objcopy
-SZ = $(PREFIX)size
-endif
-HEX = $(CP) -O ihex
-BIN = $(CP) -O binary -S
- 
-#######################################
-# CFLAGS
-#######################################
-# cpu
-CPU = -mcpu=cortex-m4
-
-# fpu
-FPU = -mfpu=fpv4-sp-d16
-
-# float-abi
-FLOAT-ABI = -mfloat-abi=hard
-
-# mcu
-MCU = $(CPU) -mthumb $(FPU) $(FLOAT-ABI)
-
-# macros for gcc
-# AS defines
-AS_DEFS = 
-
-# C defines
-C_DEFS =  \
--DUSE_HAL_DRIVER \
--DSTM32L476xx
-
-
-# AS includes
-AS_INCLUDES =  \
--IInc
-
-# C includes
-C_INCLUDES =  \
--IInc \
--I/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Inc \
--I/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Inc/Legacy \
--I/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Middlewares/Third_Party/FreeRTOS/Source/include \
--I/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Middlewares/Third_Party/FreeRTOS/Source/CMSIS_RTOS_V2 \
--I/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Middlewares/Third_Party/FreeRTOS/Source/portable/GCC/ARM_CM4F \
--I/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Middlewares/ST/STM32_USB_Device_Library/Core/Inc \
--I/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Middlewares/ST/STM32_USB_Device_Library/Class/CDC/Inc \
--I/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/CMSIS/Device/ST/STM32L4xx/Include \
--I/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/CMSIS/Include \
--I/Users/aku/Work/flipper/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/CMSIS/Include \
--IC:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Inc \
--IC:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/STM32L4xx_HAL_Driver/Inc/Legacy \
--IC:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Middlewares/Third_Party/FreeRTOS/Source/include \
--IC:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Middlewares/Third_Party/FreeRTOS/Source/CMSIS_RTOS_V2 \
--IC:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Middlewares/Third_Party/FreeRTOS/Source/portable/GCC/ARM_CM4F \
--IC:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Middlewares/ST/STM32_USB_Device_Library/Core/Inc \
--IC:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Middlewares/ST/STM32_USB_Device_Library/Class/CDC/Inc \
--IC:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/CMSIS/Device/ST/STM32L4xx/Include \
--IC:/work/cmake-stm32/projects/flipperzero-firmware-community/lib/STM32CubeL4/Drivers/CMSIS/Include
-
-
-# compile gcc flags
-ASFLAGS = $(MCU) $(AS_DEFS) $(AS_INCLUDES) $(OPT) -Wall -fdata-sections -ffunction-sections
-
-CFLAGS = $(MCU) $(C_DEFS) $(C_INCLUDES) $(OPT) -Wall -fdata-sections -ffunction-sections
-
-ifeq ($(DEBUG), 1)
-CFLAGS += -g -gdwarf-2
-endif
-
-
-# Generate dependency information
-CFLAGS += -MMD -MP -MF"$(@:%.o=%.d)"
-
-
-#######################################
-# LDFLAGS
-#######################################
-# link script
-LDSCRIPT = STM32L476RGTx_FLASH.ld
-
-# libraries
-LIBS = -lc -lm -lnosys 
-LIBDIR = 
-LDFLAGS = $(MCU) -specs=nano.specs -T$(LDSCRIPT) $(LIBDIR) $(LIBS) -Wl,-Map=$(BUILD_DIR)/$(TARGET).map,--cref -Wl,--gc-sections
-
-# default action: build all
-all: $(BUILD_DIR)/$(TARGET).elf $(BUILD_DIR)/$(TARGET).hex $(BUILD_DIR)/$(TARGET).bin
-
-
-#######################################
-# build the application
-#######################################
-# list of objects
-OBJECTS = $(addprefix $(BUILD_DIR)/,$(notdir $(C_SOURCES:.c=.o)))
-vpath %.c $(sort $(dir $(C_SOURCES)))
-# list of ASM program objects
-OBJECTS += $(addprefix $(BUILD_DIR)/,$(notdir $(ASM_SOURCES:.s=.o)))
-vpath %.s $(sort $(dir $(ASM_SOURCES)))
-
-$(BUILD_DIR)/%.o: %.c Makefile | $(BUILD_DIR) 
-	$(CC) -c $(CFLAGS) -Wa,-a,-ad,-alms=$(BUILD_DIR)/$(notdir $(<:.c=.lst)) $< -o $@
-
-$(BUILD_DIR)/%.o: %.s Makefile | $(BUILD_DIR)
-	$(AS) -c $(CFLAGS) $< -o $@
-
-$(BUILD_DIR)/$(TARGET).elf: $(OBJECTS) Makefile
-	$(CC) $(OBJECTS) $(LDFLAGS) -o $@
-	$(SZ) $@
-
-$(BUILD_DIR)/%.hex: $(BUILD_DIR)/%.elf | $(BUILD_DIR)
-	$(HEX) $< $@
-	
-$(BUILD_DIR)/%.bin: $(BUILD_DIR)/%.elf | $(BUILD_DIR)
-	$(BIN) $< $@	
-	
-$(BUILD_DIR):
-	mkdir $@		
-
-#######################################
-# clean up
-#######################################
-clean:
-	-rm -fR $(BUILD_DIR)
-  
-#######################################
-# dependencies
-#######################################
--include $(wildcard $(BUILD_DIR)/*.d)
-
-# *** EOF ***
diff --git a/firmware/targets/f2/Src/fatfs/spi_sd_hal.c b/firmware/targets/f2/Src/fatfs/spi_sd_hal.c
index 832431bd..8b6ae579 100644
--- a/firmware/targets/f2/Src/fatfs/spi_sd_hal.c
+++ b/firmware/targets/f2/Src/fatfs/spi_sd_hal.c
@@ -51,7 +51,7 @@ static void SPIx_WriteReadData(const uint8_t* DataIn, uint8_t* DataOut, uint16_t
  * @param  Value: value to be written
  * @retval None
  */
-static void SPIx_Write(uint8_t Value) {
+__attribute__((unused)) static void SPIx_Write(uint8_t Value) {
     HAL_StatusTypeDef status = HAL_OK;
     uint8_t data;
 
diff --git a/firmware/targets/f2/Src/hacks.c b/firmware/targets/f2/Src/hacks.c
deleted file mode 100644
index 8fa6665f..00000000
--- a/firmware/targets/f2/Src/hacks.c
+++ /dev/null
@@ -1,7 +0,0 @@
-#include <cmsis_os.h>
-#include <stdbool.h>
-
-bool task_equal(TaskHandle_t a, TaskHandle_t b) {
-    if(a == NULL || b == NULL) return false;
-    return a == b;
-}
diff --git a/firmware/targets/f2/api-hal/api-hal-delay.c b/firmware/targets/f2/api-hal/api-hal-delay.c
index 53db1fb0..bda9cace 100644
--- a/firmware/targets/f2/api-hal/api-hal-delay.c
+++ b/firmware/targets/f2/api-hal/api-hal-delay.c
@@ -1,4 +1,6 @@
 #include "api-hal-delay.h"
+#include "assert.h"
+#include "cmsis_os2.h"
 
 void delay_us_init_DWT(void) {
     CoreDebug->DEMCR |= CoreDebug_DEMCR_TRCENA_Msk;
@@ -6,9 +8,17 @@ void delay_us_init_DWT(void) {
     DWT->CYCCNT = 0U;
 }
 
-void delay_us(float time) {
+void delay_us(float microseconds) {
     uint32_t start = DWT->CYCCNT;
-    uint32_t time_ticks = time * (SystemCoreClock / 1000000);
+    uint32_t time_ticks = microseconds * (SystemCoreClock / 1000000.0f);
     while((DWT->CYCCNT - start) < time_ticks) {
     };
+}
+
+// cannot be used in ISR
+// TODO add delay_ISR variant
+void delay(float milliseconds) {
+    uint32_t ticks = milliseconds / (1000.0f / osKernelGetTickFreq());
+    osStatus_t result = osDelay(ticks);
+    assert(result == osOK);
 }
\ No newline at end of file
diff --git a/firmware/targets/f2/api-hal/api-hal-delay.h b/firmware/targets/f2/api-hal/api-hal-delay.h
index 4df5cd4b..9ab51e24 100644
--- a/firmware/targets/f2/api-hal/api-hal-delay.h
+++ b/firmware/targets/f2/api-hal/api-hal-delay.h
@@ -1,5 +1,6 @@
 #pragma once
 #include "main.h"
 
-void delay_us(float time);
-void delay_us_init_DWT(void);
\ No newline at end of file
+void delay(float milliseconds);
+void delay_us(float microseconds);
+void delay_us_init_DWT(void);
diff --git a/firmware/targets/f2/api-hal/api-hal-gpio.h b/firmware/targets/f2/api-hal/api-hal-gpio.h
index e31b63f9..b125a445 100644
--- a/firmware/targets/f2/api-hal/api-hal-gpio.h
+++ b/firmware/targets/f2/api-hal/api-hal-gpio.h
@@ -52,7 +52,7 @@ static inline void hal_gpio_write(GpioPin* gpio, bool state) {
 }
 
 // read value from GPIO, false = LOW, true = HIGH
-static inline bool hal_gpio_read(GpioPin* gpio) {
+static inline bool hal_gpio_read(const GpioPin* gpio) {
     if((gpio->port->IDR & gpio->pin) != 0x00U) {
         return true;
     } else {
diff --git a/firmware/targets/f2/api-hal/api-hal-task.c b/firmware/targets/f2/api-hal/api-hal-task.c
index c6127d65..263bc797 100644
--- a/firmware/targets/f2/api-hal/api-hal-task.c
+++ b/firmware/targets/f2/api-hal/api-hal-task.c
@@ -1,5 +1,5 @@
-#include "api-hal-task.h"
 #include "cmsis_os.h"
+#include "api-hal-task.h"
 
 //-----------------------------cmsis_os2.c-------------------------------
 // helpers to get isr context
@@ -51,4 +51,9 @@
 
 bool task_is_isr_context(void) {
     return IS_IRQ();
+}
+
+bool task_equal(TaskHandle_t a, TaskHandle_t b) {
+    if(a == NULL || b == NULL) return false;
+    return a == b;
 }
\ No newline at end of file
diff --git a/firmware/targets/f2/api-hal/api-hal-task.h b/firmware/targets/f2/api-hal/api-hal-task.h
index 87ee5ae7..f1d015cb 100644
--- a/firmware/targets/f2/api-hal/api-hal-task.h
+++ b/firmware/targets/f2/api-hal/api-hal-task.h
@@ -1,5 +1,7 @@
 #pragma once
 #include "main.h"
+#include <cmsis_os.h>
 #include <stdbool.h>
 
-bool task_is_isr_context(void);
\ No newline at end of file
+bool task_equal(TaskHandle_t a, TaskHandle_t b);
+bool task_is_isr_context(void);
diff --git a/firmware/targets/local/Inc/cmsis_os.h b/firmware/targets/local/Inc/cmsis_os.h
index 0fa7ef68..12019bf8 100644
--- a/firmware/targets/local/Inc/cmsis_os.h
+++ b/firmware/targets/local/Inc/cmsis_os.h
@@ -47,7 +47,6 @@ TaskHandle_t xTaskCreateStatic(TaskFunction_t pxTaskCode,
 void vTaskDelete(TaskHandle_t xTask);
 TaskHandle_t xTaskGetCurrentTaskHandle(void);
 SemaphoreHandle_t xSemaphoreCreateMutexStatic(StaticSemaphore_t* pxMutexBuffer);
-bool task_equal(TaskHandle_t a, TaskHandle_t b);
 
 QueueHandle_t xQueueCreateStatic(UBaseType_t uxQueueLength,
                                  UBaseType_t uxItemSize,
diff --git a/firmware/targets/local/Src/lo_hal.c b/firmware/targets/local/Src/lo_hal.c
index 6b13ee82..b1d3106d 100644
--- a/firmware/targets/local/Src/lo_hal.c
+++ b/firmware/targets/local/Src/lo_hal.c
@@ -16,4 +16,6 @@ HAL_UART_Transmit(UART_HandleTypeDef* handle, uint8_t* bufer, uint16_t size, uin
     return res;
 }
 
-void BSP_SD_Init() {}
+uint8_t BSP_SD_Init() {
+    return 0;
+}
diff --git a/firmware/targets/local/Src/lo_os.c b/firmware/targets/local/Src/lo_os.c
index 6b0440eb..7a8e51ea 100644
--- a/firmware/targets/local/Src/lo_os.c
+++ b/firmware/targets/local/Src/lo_os.c
@@ -74,12 +74,6 @@ TaskHandle_t xTaskGetCurrentTaskHandle(void) {
     return thread;
 }
 
-bool task_equal(TaskHandle_t a, TaskHandle_t b) {
-    if(a == NULL || b == NULL) return false;
-
-    return pthread_equal(*a, *b) != 0;
-}
-
 BaseType_t xQueueSend(QueueHandle_t xQueue, const void* pvItemToQueue, TickType_t xTicksToWait) {
     // TODO: add implementation
     return pdTRUE;
@@ -269,11 +263,11 @@ osStatus_t osMutexDelete (osMutexId_t mutex_id) {
 osSemaphoreId_t osSemaphoreNew(uint32_t max_count, uint32_t initial_count, const osSemaphoreAttr_t *attr) {
     if(max_count != 1) {
         // Non-binary semaphors are not supported at the moment
-        return osErrorParameter;
+        return NULL;
     }
     if(attr != NULL) {
         // Attributes are not supported at the moment
-        return osErrorParameter;
+        return NULL;
     }
 
     SemaphoreHandle_t handle = osMutexNew(NULL);
diff --git a/firmware/targets/local/api-hal/api-hal-delay.c b/firmware/targets/local/api-hal/api-hal-delay.c
index e40d084f..b9cfb36c 100644
--- a/firmware/targets/local/api-hal/api-hal-delay.c
+++ b/firmware/targets/local/api-hal/api-hal-delay.c
@@ -1,7 +1,11 @@
 #include "api-hal-delay.h"
 #include <stdio.h>
+#include <unistd.h>
 
-void delay_us(uint32_t time) {
-    // How to deal with it
-    printf("[DELAY] %d us\n", time);
+void delay_us(float microseconds) {
+    usleep(microseconds);
+}
+
+void delay(float milliseconds) {
+    usleep(milliseconds * 1000);
 }
\ No newline at end of file
diff --git a/firmware/targets/local/api-hal/api-hal-delay.h b/firmware/targets/local/api-hal/api-hal-delay.h
index 9db6e3a8..ff69ce4b 100644
--- a/firmware/targets/local/api-hal/api-hal-delay.h
+++ b/firmware/targets/local/api-hal/api-hal-delay.h
@@ -1,4 +1,6 @@
 #pragma once
 #include "main.h"
 
-void delay_us(uint32_t time);
\ No newline at end of file
+void delay_us(float microseconds);
+
+void delay(float milliseconds);
\ No newline at end of file
diff --git a/firmware/targets/local/api-hal/api-hal-gpio.c b/firmware/targets/local/api-hal/api-hal-gpio.c
index 13124ace..69e8e4f8 100644
--- a/firmware/targets/local/api-hal/api-hal-gpio.c
+++ b/firmware/targets/local/api-hal/api-hal-gpio.c
@@ -41,7 +41,7 @@ void hal_gpio_write(GpioPin* gpio, bool state){
 }
 
 // read value from GPIO, false = LOW, true = HIGH
-bool hal_gpio_read(GpioPin* gpio){
+bool hal_gpio_read(const GpioPin* gpio){
     // TODO emulate pin state?
     return false;
 }
diff --git a/firmware/targets/local/api-hal/api-hal-gpio.h b/firmware/targets/local/api-hal/api-hal-gpio.h
index e6dd4856..75872856 100644
--- a/firmware/targets/local/api-hal/api-hal-gpio.h
+++ b/firmware/targets/local/api-hal/api-hal-gpio.h
@@ -46,4 +46,4 @@ void hal_gpio_init(GpioPin* gpio, GpioMode mode, GpioPull pull, GpioSpeed speed)
 void hal_gpio_write(GpioPin* gpio, bool state);
 
 // read value from GPIO, false = LOW, true = HIGH
-bool hal_gpio_read(GpioPin* gpio);
\ No newline at end of file
+bool hal_gpio_read(const GpioPin* gpio);
\ No newline at end of file
diff --git a/firmware/targets/local/api-hal/api-hal-task.c b/firmware/targets/local/api-hal/api-hal-task.c
index 9729cedd..f3d5f8d1 100644
--- a/firmware/targets/local/api-hal/api-hal-task.c
+++ b/firmware/targets/local/api-hal/api-hal-task.c
@@ -1,5 +1,14 @@
 #include "api-hal-task.h"
 
+bool task_equal(TaskHandle_t a, TaskHandle_t b) {
+    if(a == NULL || b == NULL) return false;
+    return pthread_equal(*a, *b) != 0;
+}
+
 bool task_is_isr_context(void) {
     return false;
-}
\ No newline at end of file
+}
+
+void taskDISABLE_INTERRUPTS(void){
+    // we cant disable main os sheduler
+};
diff --git a/firmware/targets/local/api-hal/api-hal-task.h b/firmware/targets/local/api-hal/api-hal-task.h
index 87ee5ae7..8aed7f0f 100644
--- a/firmware/targets/local/api-hal/api-hal-task.h
+++ b/firmware/targets/local/api-hal/api-hal-task.h
@@ -1,5 +1,8 @@
 #pragma once
 #include "main.h"
+#include <cmsis_os.h>
 #include <stdbool.h>
 
-bool task_is_isr_context(void);
\ No newline at end of file
+bool task_equal(TaskHandle_t a, TaskHandle_t b);
+bool task_is_isr_context(void);
+__attribute__((unused)) void taskDISABLE_INTERRUPTS(void);