nrf52840 example work with boot keyboard

examples/device/nrf52840/src/main.c

@@ -106,10 +106,29 @@ void usb_hid_task(void)
   {
     if ( !tud_hid_keyboard_busy() )
     {
-      static bool toggle = false; // send either A or B
+      // Poll every 10ms
+      static tu_timeout_t tm = { .start = 0, .interval = 10 };
 
-      tud_hid_keyboard_send_char( toggle ? 'A' : 'B' );
-      toggle = !toggle;
+      if ( !tu_timeout_expired(&tm) ) return; // not enough time
+      tu_timeout_reset(&tm);
+
+      uint32_t bt = board_buttons();
+
+      if ( bt )
+      {
+        uint8_t keycode[6] = { 0 };
+
+        for(uint8_t i=0; i < 6; i++)
+        {
+          if ( bt & (1 << i) ) keycode[i] = HID_KEY_A + i;
+        }
+
+        tud_hid_keyboard_send_keycode(0, keycode);
+      }else
+      {
+        // Null means empty (all zeroes) report
+        tud_hid_keyboard_send_report(NULL);
+      }
     }
 
     if ( !tud_hid_mouse_busy() )
@@ -143,15 +162,11 @@ void tud_cdc_rx_cb(uint8_t itf)
 //--------------------------------------------------------------------+
 void led_blinking_task(void)
 {
-  enum { BLINK_INTEVAL = 1000 };
-
+  static tu_timeout_t tm = { .start = 0, .interval = 1000 }; // Blink every 1000 ms
   static bool led_state = false;
-  static uint32_t last_blink = 0;
-
-  // not enough time
-  if ( last_blink + BLINK_INTEVAL > tusb_hal_millis() ) return;
 
-  last_blink += BLINK_INTEVAL;
+  if ( !tu_timeout_expired(&tm) ) return; // not enough time
+  tu_timeout_reset(&tm);
 
   board_led_control(BOARD_LED0, led_state);
   led_state = 1 - led_state; // toggle

hw/bsp/board.h

@@ -150,7 +150,6 @@ static inline void board_led_off(uint32_t led_id)
   board_led_control(led_id, false);
 }
 
-
 /** \brief Get the current state of the buttons on the board
  * \return Bitmask where a '1' means active (pressed), a '0' means inactive.
  */

hw/bsp/pca10056/board_pca10056.c

@@ -44,10 +44,16 @@
 /* MACRO TYPEDEF CONSTANT ENUM
  *------------------------------------------------------------------*/
 #define LED_1           13
+
 #define LED_STATE_ON    0
 #define LED_STATE_OFF   (1-LED_STATE_ON)
 
 
+uint8_t _button_pins[] = { 11, 12, 24, 25 };
+
+#define BOARD_BUTTON_COUNT  arrcount_(_button_pins)
+
+
 /*------------------------------------------------------------------*/
 /* TUSB HAL MILLISECOND
  *------------------------------------------------------------------*/
@@ -60,44 +66,72 @@ void SysTick_Handler (void)
 
 uint32_t tusb_hal_millis(void)
 {
-  //#define tick2ms(tck)         ( ( ((uint64_t)(tck)) * 1000) / configTICK_RATE_HZ )
-  //return tick2ms( app_timer_cnt_get() );
-
   return board_tick2ms(system_ticks);
 }
 
 /*------------------------------------------------------------------*/
 /* BOARD API
  *------------------------------------------------------------------*/
+
+/* tinyusb function that handles power event (detected, ready, removed)
+ * We must call it within SD's SOC event handler, or set it as power event handler if SD is not enabled.
+ */
+extern void tusb_hal_nrf_power_event(uint32_t event);
+
 void board_init(void)
 {
   // Config clock source: XTAL or RC in sdk_config.h
   NRF_CLOCK->LFCLKSRC = (uint32_t)((CLOCK_LFCLKSRC_SRC_Xtal << CLOCK_LFCLKSRC_SRC_Pos) & CLOCK_LFCLKSRC_SRC_Msk);
   NRF_CLOCK->TASKS_LFCLKSTART = 1UL;
 
+  // LED
   nrf_gpio_cfg_output(LED_1);
 
+  // Button
+  for(uint8_t i=0; i<BOARD_BUTTON_COUNT; i++) nrf_gpio_cfg_input(_button_pins[i], NRF_GPIO_PIN_PULLUP);
+
+  // Tick init
+  SysTick_Config(SystemCoreClock/1000);
+  NVIC_EnableIRQ(SysTick_IRQn);
+
+  // USB power may already be ready at this time -> no event generated
+  // We need to invoke the handler based on the status initially
+  uint32_t usb_reg;
+
 #ifdef SOFTDEVICE_PRESENT
-  // TODO support Softdevice config
+  uint8_t sd_en = false;
+  (void) sd_softdevice_is_enabled(&sd_en);
+
+  if ( sd_en ) {
+    sd_power_usbdetected_enable(true);
+    sd_power_usbpwrrdy_enable(true);
+    sd_power_usbremoved_enable(true);
+
+    sd_power_usbregstatus_get(&usb_reg);
+  }else
 #else
-  // Softdevice is not present, init power module and register tusb power event function
-  // for vusb detect, ready, removed
-  extern void tusb_hal_nrf_power_event(uint32_t event);
+  {
+    // Power module init
+    const nrfx_power_config_t pwr_cfg = { 0 };
+    nrfx_power_init(&pwr_cfg);
 
-  // Power module init
-  const nrfx_power_config_t pwr_cfg = { 0 }; 
-  nrfx_power_init(&pwr_cfg);
+    // Register tusb function as USB power handler
+    const nrfx_power_usbevt_config_t config = { .handler = (nrfx_power_usb_event_handler_t) tusb_hal_nrf_power_event };
+    nrfx_power_usbevt_init(&config);
 
-  // USB Power detection
-  const nrfx_power_usbevt_config_t config = { .handler = (nrfx_power_usb_event_handler_t) tusb_hal_nrf_power_event };
-  nrfx_power_usbevt_init(&config);
+    nrfx_power_usbevt_enable();
 
-  nrfx_power_usbevt_enable();
+    usb_reg = NRF_POWER->USBREGSTATUS;
+  }
 #endif
 
-  // Tick init
-  SysTick_Config(SystemCoreClock/1000);
-  NVIC_EnableIRQ(SysTick_IRQn);
+  if ( usb_reg & POWER_USBREGSTATUS_VBUSDETECT_Msk ) {
+    tusb_hal_nrf_power_event(NRFX_POWER_USB_EVT_DETECTED);
+  }
+
+  if ( usb_reg & POWER_USBREGSTATUS_OUTPUTRDY_Msk ) {
+    tusb_hal_nrf_power_event(NRFX_POWER_USB_EVT_READY);
+  }
 }
 
 void board_led_control(uint32_t led_id, bool state)
@@ -108,7 +142,15 @@ void board_led_control(uint32_t led_id, bool state)
 
 uint32_t board_buttons(void)
 {
-  return 0;
+  uint32_t ret = 0;
+
+  for(uint8_t i=0; i<BOARD_BUTTON_COUNT; i++)
+  {
+    // button is active LOW
+    ret |= ( nrf_gpio_pin_read(_button_pins[i]) ? 0 : BIT_(i));
+  }
+
+  return ret;
 }
 
 uint8_t  board_uart_getchar(void)