USB VCP Cli (#237)

* Core: ring buffer.
* Api: usb vcp. F3: vcp glue code.
* Applications: cli draft version.
* Cli: basic working version, includes help and version commands
* HAL: vcp on f2
* Makefile: update openocd conf
* F3: vcp rx with freertos stream
* Cli: help
* Cli: standard commands, api-hal-uid
* Power: cli poweroff.

firmware/targets/f3/api-hal/api-hal-uuid.c

@@ -0,0 +1,10 @@
+#include <api-hal-uid.h>
+#include <stm32wbxx.h>
+
+size_t api_hal_uid_size() {
+    return 64/8;
+}
+
+const uint8_t* api_hal_uid() {
+    return (const uint8_t *)UID64_BASE;
+}

firmware/targets/f3/api-hal/api-hal-vcp.c

@@ -0,0 +1,92 @@
+#include <api-hal-vcp.h>
+#include <usbd_cdc_if.h>
+#include <flipper_v2.h>
+#include <stream_buffer.h>
+
+#define API_HAL_VCP_RX_BUFFER_SIZE 600
+
+typedef struct {
+    StreamBufferHandle_t rx_stream;
+    osSemaphoreId_t tx_semaphore;
+    volatile bool alive;
+    volatile bool underrun;
+} ApiHalVcp;
+
+ApiHalVcp api_hal_vcp;
+
+static const uint8_t ascii_soh = 0x01;
+static const uint8_t ascii_eot = 0x04;
+
+void _api_hal_vcp_init();
+void _api_hal_vcp_deinit();
+void _api_hal_vcp_control_line(uint8_t state);
+void _api_hal_vcp_rx_callback(const uint8_t* buffer, size_t size);
+void _api_hal_vcp_tx_complete(size_t size);
+
+void api_hal_vcp_init() {
+    api_hal_vcp.rx_stream = xStreamBufferCreate(API_HAL_VCP_RX_BUFFER_SIZE, 1);
+    api_hal_vcp.tx_semaphore = osSemaphoreNew(1, 1, NULL);
+    api_hal_vcp.alive = false;
+    api_hal_vcp.underrun = false;
+}
+
+void _api_hal_vcp_init() {
+    osSemaphoreRelease(api_hal_vcp.tx_semaphore);
+}
+
+void _api_hal_vcp_deinit() {
+    api_hal_vcp.alive = false;
+    osSemaphoreRelease(api_hal_vcp.tx_semaphore);
+}
+
+void _api_hal_vcp_control_line(uint8_t state) {
+    // bit 0: DTR state, bit 1: RTS state
+    // bool dtr = state & 0b01;
+    bool rts = state & 0b10;
+
+    if (rts) {
+        api_hal_vcp.alive = true;
+        _api_hal_vcp_rx_callback(&ascii_soh, 1); // SOH
+    } else {
+        api_hal_vcp.alive = false;
+        _api_hal_vcp_rx_callback(&ascii_eot, 1); // EOT
+    }
+
+    osSemaphoreRelease(api_hal_vcp.tx_semaphore);
+}
+
+void _api_hal_vcp_rx_callback(const uint8_t* buffer, size_t size) {
+    BaseType_t xHigherPriorityTaskWoken = pdFALSE;
+    size_t ret = xStreamBufferSendFromISR(api_hal_vcp.rx_stream, buffer, size, &xHigherPriorityTaskWoken);
+    if (ret != size) {
+        api_hal_vcp.underrun = true;
+    }
+    portYIELD_FROM_ISR(xHigherPriorityTaskWoken);
+}
+
+void _api_hal_vcp_tx_complete(size_t size) {
+    osSemaphoreRelease(api_hal_vcp.tx_semaphore);
+}
+
+size_t api_hal_vcp_rx(uint8_t* buffer, size_t size) {
+    return xStreamBufferReceive(api_hal_vcp.rx_stream, buffer, size, portMAX_DELAY);
+}
+
+void api_hal_vcp_tx(uint8_t* buffer, size_t size) {
+    while (size > 0 && api_hal_vcp.alive) {
+        furi_check(osSemaphoreAcquire(api_hal_vcp.tx_semaphore, osWaitForever) == osOK);
+
+        size_t batch_size = size;
+        if (batch_size > APP_TX_DATA_SIZE) {
+            batch_size = APP_TX_DATA_SIZE;
+        }
+
+        if (CDC_Transmit_FS(buffer, batch_size) == USBD_OK) {
+            size -= batch_size;
+            buffer += batch_size;
+        } else {
+            // Shouldn't be there 
+            osDelay(100);
+        }
+    }
+}

firmware/targets/f3/api-hal/api-hal.h

@@ -1,7 +0,0 @@
-#pragma once
-
-#include "api-hal-gpio.h"
-#include "api-hal-delay.h"
-#include "api-hal-pwm.h"
-#include "api-hal-task.h"
-#include "api-hal-tim.h"