APP_UART_DATA_READY reset nRF52832

[daniel]

Hi, I am a beginner programmer and I have the next problem.

I am working with nRF52832 SDK 12.2 trying to send AT commands to an ESP8266. I send the AT commands byte by byte through UART which I managed with APP_UART_TX_EMPTY. Then I receive the ESP8266 response in APP_UART_DATA_READY and when I should get a response such as \r\nOK\r\n I get half data instead. When it happens the nRF52 resets. The ESP8266 is working rigth because I check the response with a terminal so I think I could be a problem with UART. Any help will be appreciated.

Thanks in advance

[Matt]

Can you share your uart_event_handle() code here? Are you using an array to buffer up the received bytes? Can it be an array index out of bound issue?

[daniel]

I haven't had a solution yet. I have debug and get the reset reason 0x00000004. Here it is my uart_event_handle() :

void uart_wifi_event_handle(app_uart_evt_t * p_event) { static uint8_t data_wifi_array; uint32_t err_code;

switch (p_event->evt_type)
{
		
		case APP_UART_DATA_READY:
				
		UNUSED_VARIABLE(app_uart_get(&data_wifi_array));
		
		
		if(ind_datawifi_uart == 0)
			{
				if(data_wifi_array == 0x0D)
					{
					startreadwifiUART=true;
					memset(cmd_wifi_buff,0,UART_TX_BUF_SIZE);
					}
			}
				
			if (startreadwifiUART)
				{
					cmd_wifi_buff[ind_datawifi_uart]=data_wifi_array;
					ind_datawifi_uart++;
                                     }

    break;
			
			case APP_UART_TX_EMPTY:
				if(wlenps > 0)
				{	
					err_code = app_uart_put(stringwifi[windps]);
					APP_ERROR_CHECK(err_code);
					windps++;
				}
			break;

    default:
				
        break;
			}
	}

}

Where I sent AT commands through APP_UART_TX_EMPTY and I should get the completely response on APP_UART_DATA_READY.

[Matt]

I assume you have the global

uint8_t cmd_wifi_buff[UART_TX_BUF_SIZE];

defined in some other c module correct?

Is it possible to run the app_uart_put() in your main() program instead of inside the uart_event_handle()? Just try this quick test and let us know how it goes.

[daniel]

Yes Matt, it is already defined. Unless I run app_uart_put() inside the uart_event_handle() I just get the first byte of AT commands.

Thanks

[Matt]

But how would you stop sending the AT command? i.e. when would wlenps become 0? Can you try this in the main()

    char stringwifi[] = "<put your AT cmd here...>";
for (uint16_t i = 0; i < strlen(stringwifi); i++)
{
	while(app_uart_put(stringwifi[i]) != NRF_SUCCESS);
}