I can't read on my uart

[Geoffroy]

Hi, i'm using nRF52840

I'm using 2 uarts : 

one (uart0) is only for logging and another one (uart1) is for communication.

I can send from both uart, i can see i receive datas from uart1 but i can't read it  

I try to read with an event_handle, event occurs i go inside in correct  case, i can see i'm in the good case (using docklight software i can send one charac then another... and each time i send one i enter in case for reading)

see below code for init : 

NRF_SERIAL_DRV_UART_CONFIG_DEF(m_uart0_drv_config,
                      ARDUINO_SDA_PIN, ARDUINO_SCL_PIN,
                      ARDUINO_12_PIN, ARDUINO_13_PIN,
                      APP_UART_FLOW_CONTROL_DISABLED, NRF_UART_PARITY_EXCLUDED,
                      NRF_UART_BAUDRATE_57600,
                      APP_IRQ_PRIORITY_LOWEST);
NRF_SERIAL_DRV_UART_CONFIG_DEF(m_uart1_drv_config,
					  RX_PIN_NUMBER, TX_PIN_NUMBER,
                      RTS_PIN_NUMBER, CTS_PIN_NUMBER,
                      APP_UART_FLOW_CONTROL_DISABLED, NRF_UART_PARITY_EXCLUDED,
                      NRF_UART_BAUDRATE_19200,
                      APP_IRQ_PRIORITY_LOWEST);

NRF_SERIAL_QUEUES_DEF(serial0_queues, 32, 32);
NRF_SERIAL_QUEUES_DEF(serial1_queues, 32, 32);

NRF_SERIAL_BUFFERS_DEF(serial0_buffs, 1, 1);
NRF_SERIAL_BUFFERS_DEF(serial1_buffs, 1, 1);

NRF_SERIAL_CONFIG_DEF(serial0_config, NRF_SERIAL_MODE_IRQ,
                      &serial0_queues, &serial0_buffs, NULL, sleep_handler);
NRF_SERIAL_CONFIG_DEF(serial1_config, NRF_SERIAL_MODE_IRQ,
                      &serial1_queues, &serial1_buffs, uart_event_handle, sleep_handler);

NRF_SERIAL_UART_DEF(serial0_uart, 0);
NRF_SERIAL_UART_DEF(serial1_uart, 1);

and code for event_handle :

void uart_event_handle(struct nrf_serial_s const * p_serial,
        nrf_serial_event_t event)
{
    switch (event)
    {
    	case NRF_SERIAL_EVENT_RX_DATA :
        	//I enter each time i send one charac
        	SEGGER_RTT_WriteString(0, "Uart : NRF_SERIAL_EVENT_RX_DATA\n");
        	mbedtls_mutex_lock( &mutex_uart );
			char c;
			nrf_serial_read(&serial1_uart, &c, sizeof(c), NULL, 1000);
			SEGGER_RTT_printf(0, "Data reçue : %#02x \n", c);
			//I always receive 10 
            mbedtls_mutex_unlock( &mutex_uart );
        default:
   		    SEGGER_RTT_WriteString(0, "Uart : default\n");
            break;
    }
}

All this code comes from examples provided bay sdk...

maybe i'm not reading the correct buffer but i don't know which one to read then.

thx for help

Geoffroy

[Geoffroy]

EDIT : 

I add ret = to function nrf_serial_read to get err_code.

i get err_code 0x80 for NRF_ERROR_MODULE_NOT_INITIALIZED.

code for init (above) is in main.c and code for event_handle is in another file, uart.c could it be a problem ?

[bjorn-spockeli]

It might be if the p_serial pointer passed to nrf_serial_read() function is not the same as the one the one defined in NRF_SERIAL_UART_DEF(serial1_uart, 1). Have you placed NRF_SERIAL_UART_DEF(serial1_uart, 1) in a common header file that that is included in both main and uart.c?

ret_code_t nrf_serial_read(nrf_serial_t const * p_serial,
                           void * p_data,
                           size_t size,
                           size_t * p_read,
                           uint32_t timeout_ms)
{
    ret_code_t ret;

    ASSERT(p_serial);
    if (!p_serial->p_ctx->p_config)
    {
        return NRF_ERROR_MODULE_NOT_INITIALIZED;
    }
    
    .
    .
    .
}

Best regards

Bjørn

[bjorn-spockeli]

Then is sounds like the data pointed to by p_serial is modified between the calls. Can you print or set a breakpoint at the nrf_serial_read() call and see if the data is being modified between the calls?

Best regards

Bjørn

[Geoffroy]

data isn't modified between calls.

i changed timeout value to 0 in nrf_serial_read() call and it works correctly now.

[bjorn-spockeli]

Ok, so changing the timeout_ms  variable to 0, i.e. executing the nrf_serial_read function as a non-blocking call fixed the issue? I do not see why that change resolves teh issue with nrf_serial_read returning 0x80, i.e. NRF_ERROR_MODULE_NOT_INITIALIZED.

[Geoffroy]

yes right now i can read each data so that's good (i still have other tests to do)

i don't understand neither.

i understand to get an err 0x80 because my function event_handle wasn't in same file that def of uart OK.

but why there is an err for module not initialized after i could read data once I don't know !!!

[bjorn-spockeli]

The NRF_ERROR_MODULE_NOT_INITIALIZED error should only be returned if the following evaluates to false:

if (!p_serial->p_ctx->p_config)
{
return NRF_ERROR_MODULE_NOT_INITIALIZED;
}