UART pin change

[Aftab]

Hello,

I'm using SDK v16.0. I'm trying to change the default UART pins from 6,8 to 45,46. In the pca10056.h I have made following changes.

//#define RX_PIN_NUMBER 8
//#define TX_PIN_NUMBER 6

// Changed in hardware v1.6
#define RX_PIN_NUMBER 45
#define TX_PIN_NUMBER 46

But I still see log on pin 6 and 8.

I also tried to change pins in sdk_config.h like following, but no success:

// <o> HCI_UART_RX_PIN - UART RX pin 
#ifndef HCI_UART_RX_PIN
//#define HCI_UART_RX_PIN 8
#define HCI_UART_RX_PIN 45
#endif

// <o> HCI_UART_TX_PIN - UART TX pin 
#ifndef HCI_UART_TX_PIN
//#define HCI_UART_TX_PIN 6
#define HCI_UART_TX_PIN 46
#endif

Tried this: https://devzone.nordicsemi.com/f/nordic-q-a/53691/re-changing-the-uart-tx-rx-pins

But it throws error: Cannot find definition of app_uart_comm_params_t

Thanks

[Aftab]

I'm not using any development kit, we have our custom board. Basically we were using default pin 6/8 for UART logging. Then we had to assign these pins for some other peripheral. Now pin 45/46 are reserved for UART and no peripheral is connected to them. We just wanted to output the logs on these pins. 

This is the error I get on terminal:

<error> app: ERROR 8 [NRF_ERROR_INVALID_STATE]

The error is on last line of the following code snippet:

static void uart_init(void)
{   
    uint32_t err_code;
    const app_uart_comm_params_t comm_params =
      {
          DTM_RX_PIN,
          DTM_TX_PIN,
          RTS_PIN_NUMBER,
          CTS_PIN_NUMBER,
          APP_UART_FLOW_CONTROL_DISABLED,
          false,
          DTM_BITRATE
      };

    APP_UART_FIFO_INIT(&comm_params,
                       UART_RX_BUF_SIZE,
                       UART_TX_BUF_SIZE,
                       uart_error_handle,
                       APP_IRQ_PRIORITY_LOWEST,
                       err_code);

    APP_ERROR_CHECK(err_code);
}

[Amanda Hsieh]

Hi Aftab, 

Are you using the NRF_LOG module and UART at the same time?

There are several similar cases on Devzone that might help you. 

https://devzone.nordicsemi.com/f/nordic-q-a/46109/error-code-0x08-nrf_error_invalid_state-is-returned-by-uart_init/226458#226458

https://devzone.nordicsemi.com/f/nordic-q-a/37735/app_uart_fifo_init-returns-nrf_error_invalid_state-error-0x00000008

https://devzone.nordicsemi.com/f/nordic-q-a/19767/app_uart_fifo_init-crashes

If they still cannot help, please create a new for it. This issue is far away from the original issue.

-Amanda H.