fix multithread logic in template app, update gpio HAL (#250)

* fix multithread logic
* more buffer for dallas id string
* update apps to use new logic
* delay_us small speedup
* add consant qualifier to gpio records and some core api
* fix some apps to use simpler method of getting gpio record
* fix ibutton app, stupid stack problem

applications/ibutton/ibutton.cpp

@@ -4,25 +4,21 @@
 
 // start app
 void AppiButton::run() {
-    acquire_state();
     mode[0] = new AppiButtonModeDallasRead(this);
     mode[1] = new AppiButtonModeDallasEmulate(this);
-    release_state();
 
     switch_to_mode(0);
 
-    // create pin
-    GpioPin red_led = led_gpio[0];
-    GpioPin green_led = led_gpio[1];
-
     // TODO open record
-    red_led_record = &red_led;
-    green_led_record = &green_led;
+    red_led_record = &led_gpio[0];
+    green_led_record = &led_gpio[1];
 
     // configure pin
     gpio_init(red_led_record, GpioModeOutputOpenDrain);
     gpio_init(green_led_record, GpioModeOutputOpenDrain);
 
+    app_ready();
+
     AppiButtonEvent event;
     while(1) {
         if(get_event(&event, 100)) {
@@ -61,9 +57,7 @@ void AppiButton::render(CanvasApi* canvas) {
     canvas->set_font(canvas, FontPrimary);
     canvas->draw_str(canvas, 2, 12, "iButton");
 
-    if(mode[state.mode_index] != NULL) {
-        mode[state.mode_index]->render(canvas, &state);
-    }
+    mode[state.mode_index]->render(canvas, &state);
 }
 
 void AppiButton::blink_red() {

applications/ibutton/ibutton.h

@@ -38,11 +38,11 @@ public:
 // with template variables <state, events>
 class AppiButton : public AppTemplate<AppiButtonState, AppiButtonEvent> {
 public:
-    GpioPin* red_led_record;
-    GpioPin* green_led_record;
+    const GpioPin* red_led_record;
+    const GpioPin* green_led_record;
 
     static const uint8_t modes_count = 2;
-    AppTemplateMode<AppiButtonState, AppiButtonEvent>* mode[modes_count] = {NULL, NULL};
+    AppTemplateMode<AppiButtonState, AppiButtonEvent>* mode[modes_count];
 
     void run();
     void render(CanvasApi* canvas);

applications/ibutton/ibutton_mode_dallas_emulate.h

@@ -17,8 +17,7 @@ public:
         app = parent_app;
 
         // TODO open record
-        GpioPin one_wire_pin = ibutton_gpio;
-        GpioPin* one_wire_pin_record = &one_wire_pin;
+        const GpioPin* one_wire_pin_record = &ibutton_gpio;
         onewire_slave = new OneWireGpioSlave(one_wire_pin_record);
     };
 };
@@ -39,9 +38,11 @@ void AppiButtonModeDallasEmulate::render(CanvasApi* canvas, AppiButtonState* sta
     canvas->draw_str(canvas, 2, 25, "< dallas emulate");
     canvas->draw_str(canvas, 2, 37, "unimplemented");
     {
-        char buf[24];
-        sprintf(
+        const uint8_t buffer_size = 32;
+        char buf[buffer_size];
+        snprintf(
             buf,
+            buffer_size,
             "%x:%x:%x:%x:%x:%x:%x:%x",
             state->dallas_address[0],
             state->dallas_address[1],

applications/ibutton/ibutton_mode_dallas_read.h

@@ -17,8 +17,7 @@ public:
         app = parent_app;
 
         // TODO open record
-        GpioPin one_wire_pin = ibutton_gpio;
-        GpioPin* one_wire_pin_record = &one_wire_pin;
+        const GpioPin* one_wire_pin_record = &ibutton_gpio;
         onewire = new OneWireGpio(one_wire_pin_record);
     };
 
@@ -68,9 +67,11 @@ void AppiButtonModeDallasRead::render(CanvasApi* canvas, AppiButtonState* state)
     canvas->draw_str(canvas, 2, 25, "dallas read >");
     canvas->draw_str(canvas, 2, 37, "touch me, iButton");
     {
-        char buf[24];
-        sprintf(
+        const uint8_t buffer_size = 32;
+        char buf[buffer_size];
+        snprintf(
             buf,
+            buffer_size,
             "%x:%x:%x:%x:%x:%x:%x:%x",
             state->dallas_address[0],
             state->dallas_address[1],

applications/ibutton/one_wire_gpio.h

@@ -5,10 +5,10 @@
 
 class OneWireGpio {
 private:
-    GpioPin* gpio;
+    const GpioPin* gpio;
 
 public:
-    OneWireGpio(GpioPin* one_wire_gpio);
+    OneWireGpio(const GpioPin* one_wire_gpio);
     ~OneWireGpio();
     bool reset(void);
     bool read_bit(void);
@@ -20,7 +20,7 @@ public:
     void stop(void);
 };
 
-OneWireGpio::OneWireGpio(GpioPin* one_wire_gpio) {
+OneWireGpio::OneWireGpio(const GpioPin* one_wire_gpio) {
     gpio = one_wire_gpio;
 }
 

applications/ibutton/one_wire_slave_gpio.h

@@ -5,10 +5,10 @@
 
 class OneWireGpioSlave {
 private:
-    GpioPin* gpio;
+    const GpioPin* gpio;
 
 public:
-    OneWireGpioSlave(GpioPin* one_wire_gpio);
+    OneWireGpioSlave(const GpioPin* one_wire_gpio);
     ~OneWireGpioSlave();
     void start(void);
     void stop(void);
@@ -25,7 +25,7 @@ public:
     OneWiteTimeType wait_while_gpio(volatile OneWiteTimeType retries, const bool pin_value);
 };
 
-OneWireGpioSlave::OneWireGpioSlave(GpioPin* one_wire_gpio) {
+OneWireGpioSlave::OneWireGpioSlave(const GpioPin* one_wire_gpio) {
     gpio = one_wire_gpio;
 }