fix -Wcast-function-type warnings

Makefile

@@ -261,6 +261,7 @@ CFLAGS += \
 	-mcpu=cortex-m4 \
 	-mfloat-abi=hard \
 	-mfpu=fpv4-sp-d16 \
+	-ggdb \
 	-Os \
 	-ffunction-sections \
 	-fdata-sections \
@@ -280,8 +281,7 @@ CFLAGS += \
 	-Wsign-compare \
 	-Wmissing-format-attribute \
 	-Wno-endif-labels \
-	-Wunreachable-code \
-	-ggdb
+	-Wunreachable-code
 
 # Suppress warning caused by SDK
 CFLAGS += -Wno-unused-parameter -Wno-expansion-to-defined

src/main.c

@@ -76,6 +76,10 @@
 void usb_init(bool cdc_only);
 void usb_teardown(void);
 
+// 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);
+
 #else
 
 #define usb_init(x)       led_state(STATE_USB_MOUNTED) // mark nrf52832 as mounted
@@ -474,13 +478,12 @@ uint32_t proc_soc(void)
     pstorage_sys_event_handler(soc_evt);
 
 #ifdef NRF_USBD
-    extern void tusb_hal_nrf_power_event(uint32_t event);
     /*------------- usb power event handler -------------*/
     int32_t usbevt = (soc_evt == NRF_EVT_POWER_USB_DETECTED   ) ? NRFX_POWER_USB_EVT_DETECTED:
                      (soc_evt == NRF_EVT_POWER_USB_POWER_READY) ? NRFX_POWER_USB_EVT_READY   :
                      (soc_evt == NRF_EVT_POWER_USB_REMOVED    ) ? NRFX_POWER_USB_EVT_REMOVED : -1;
 
-    if ( usbevt >= 0) tusb_hal_nrf_power_event(usbevt);
+    if ( usbevt >= 0) tusb_hal_nrf_power_event((uint32_t) usbevt);
 #endif
   }
 

src/usb/usb.c

@@ -42,9 +42,13 @@
  * 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);
 
-//--------------------------------------------------------------------+
+// power callback when SD is not enabled
+static void power_event_handler(nrfx_power_usb_evt_t event)
+{
+  tusb_hal_nrf_power_event((uint32_t) event);
+}
+
 // Forward USB interrupt events to TinyUSB IRQ Handler
-//--------------------------------------------------------------------+
 void USBD_IRQHandler(void)
 {
   tud_int_handler(0);
@@ -80,8 +84,8 @@ void usb_init(bool cdc_only)
     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 };
+    // Register USB power handler
+    const nrfx_power_usbevt_config_t config = { .handler = power_event_handler };
     nrfx_power_usbevt_init(&config);
 
     nrfx_power_usbevt_enable();