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

[Amanda Hsieh]

Hi Aftab, 

But it throws error: Cannot find definition of app_uart_comm_params_t

You have to include app_uart.h and app_uart.c under nRF5_SDK\components\libraries\uart. See Including header files and Adding source files.

-Amanda H.

[Aftab]

I get this error after adding above files:

undefined reference to `app_uart_init'

In the app_uart.c file it seems that I need to enable APP_UART, this pre-processor directive is disabling the whole file:

#if NRF_MODULE_ENABLED(APP_UART)

BTW, why do we need to add this code, why not change some pin settings?

[Amanda Hsieh]

Hi Aftab, 

 

Aftab said:

In the app_uart.c file it seems that I need to enable APP_UART, this pre-processor directive is disabling the whole file:

#if NRF_MODULE_ENABLED(APP_UART)

You need to enable the app_uart - UART driver in the sdk_config.h as

// <e> APP_UART_ENABLED - app_uart - UART driver
//==========================================================
#ifndef APP_UART_ENABLED
#define APP_UART_ENABLED 1
#endif

 

Aftab said:

why do we need to add this code, why not change some pin settings?

You can just change the pin setting or rename the pin in the app_uart_comm_params_t as that case. It depends on your usage. 

 

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.

 Are you using on nRF52840DK? If so, I don't think there are P0.45, P0.46 on nRF52840DK. You might consider other pins.

-Amanda H.