Remapping of i2c pins

[Tony]

Hi,

I would like to use the SDA pin for i2c to be pin 7 for nRF52. I did the following change to my code, but it is still not working. Note that CTS pin is by default mapped to pin 7, so I remapped it to pin 10.

Any idea ? Thanks !!!

//=======================================
//Use pins 7 for SDA and 30 for SCL in main.c
    const nrf_drv_twi_config_t twi_GPS_config = {
       .scl                = 30,
       .sda                = 7,
       .frequency          = NRF_TWI_FREQ_100K,
       .interrupt_priority = APP_IRQ_PRIORITY_HIGH
    };

//In pca10040.h, remap CTS to pin 10 and use in for UART in main.cpp
###\#define RX_PIN_NUMBER  8
###\#define TX_PIN_NUMBER  6
###\#define CTS_PIN_NUMBER 10
###\#define RTS_PIN_NUMBER 5

    const app_uart_comm_params_t comm_params =
    {
        RX_PIN_NUMBER,
        TX_PIN_NUMBER,
        RTS_PIN_NUMBER,
        CTS_PIN_NUMBER,
        APP_UART_FLOW_CONTROL_DISABLED,
        false,
        UART_BAUDRATE_BAUDRATE_Baud115200
    };

I also changes the sda, scl pin defintiion in nrf_drv_config.h (not sure if this is needed)

###\#define TWI0_CONFIG_SCL 0x1d
###\#define TWI0_CONFIG_SDA 0x07

[MartinBL]

Hi

Changing the pin defines like that is usually all there is to it. However, if you are using nRF52 DK then P0.07 is also connected to the Segger chip on board, and this might be the root cause of your troubles. To work around this you can cut the solder bridge SB23 (on PCA10040). Refer to the reference design files.

[cyberluke]

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