Cannot Read PA1 Button State or Print Debug Logs in STM32WB05KZ BLE RC Peripheral Project

[pradeepaan]

Hi everyone,

I’m working with the STM32WB05KZ using the BLE RC Peripheral example from STM32CubeMX.
I added a push button on PA1 and an LED on PA0.

My goal:

• Read PA1 button state

• Turn ON LED on PA0 when button is pressed

• Send BLE notification to the central device

• Continuously print PA1 state every 1 second on the serial monitor

Here is the code snippet:

APP_DBG_MSG("SW1 OK\n"); 
uint32_t lastPrint = 0; // Print every 1 second 
if ((HAL_GetTick() - lastPrint) >= 1000) 
{
  lastPrint = HAL_GetTick(); 
  uint8_t state = HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_1); 
  APP_DBG_MSG("PA1 State = %d\n", state); 
} 

while (1) { // Needed for BLE MX_APPE_Process(); }

The output I get is:

aci_gap_configure_filter_accept_and_resolving_list command
 ==>> End BLE_Init function 

Services and Characteristics creation 
  Success: aci_gatt_srv_add_service command: 
RC_LR_Periph 
End of Services and Characteristics creation 

  Success: aci_hal_set_radio_activity_mask command
==>> Success: aci_gap_set_advertising_configuration 
==>> Success: aci_gap_set_advertising_data 
==>> Success: aci_gap_set_advertising_enable 
SW1 OK

After that, I never see “PA1 State = …”.
No further serial output.

I tried placing the print inside the while loop and outside the loop, but still no data in the serial monitor.

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Does anyone know:

1. Why APP_DBG_MSG prints only once?

2. Where is the correct place to add periodic debug logs in the BLE WB05 project?

3. Do I need to enable any UART / trace settings for continuous debug output?

4. Is MX_APPE_Process() blocking the CPU?

Any suggestions or example code would be appreciated.

Thank you!

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[pradeepaan]

my code

output

[Saket_Om · Accepted solution]

Hello @pradeepaan 

The code does not enter the if condition, which is why the pin state is not printed.

[pradeepaan]

Hello @Saket_Om
Thanks for the response.

I understand why the if() is not entering, but my question is:

How can I run this function (LED toggle logic) without using while() or if() inside the main loop?

I want the LED toggle to work automatically when the button callback sets led_toggle_active = 1, but the BLE example uses:

Since everything must run inside the BLE scheduler, I am not sure what is the correct method to schedule or run my LED toggle function without adding blocking code or polling inside the while(1) loop.

Should this be implemented using:

• UTIL_SEQ_SetTask() or

• a timer callback

• or some other recommended method?

Please advise on the proper way to execute such logic in STM32WB without adding if() checks inside the main loop.

Thank you!