RE: TWI communication issue with nRF52840 Dongle

Håkon Alseth — Fri, 08 May 2020 12:08:59 GMT

Hi,

It seems that you're using the NFC pins as TWI SCL/SDA pins (P0.09 and P0.10). You need the preprocessor define "CONFIG_NFCT_PINS_AS_GPIOS" set in order to use those as normal GPIOs, or use any other available GPIOs for this purpose. On development kits (nrf52-DK, nrf52840-DK, etc), you also need to move some zero-ohm resistors to route the signals to the pin header.

Kind regards,

Håkon

RE: TWI communication issue with nRF52840 Dongle

Gyuri — Thu, 07 May 2020 16:40:32 GMT

void i2c_write( uint8_t address, uint8_t * data, int count ) {
    m_xfer_done = false;
    m_err_code = nrf_drv_twi_tx( &m_twi, address, data, count, false );
    if ( m_err_code != NRF_SUCCESS ) {
      NRF_LOG_DEBUG( "I2C WRITE ERROR: %d\r\n", m_err_code );
    }
    while (m_xfer_done == false){
    blinkit();
    };
    APP_ERROR_CHECK( m_err_code );
}

/* Blocking reading call for I2C */
void i2c_read( uint8_t address, uint8_t * data, int count ) {
    m_xfer_done = false;
    m_err_code = nrf_drv_twi_rx( &m_twi, address, data, count );
    if ( m_err_code != NRF_SUCCESS ) {
    	NRF_LOG_DEBUG( "I2C READ ERROR: %d\r\n", m_err_code );
        printf( "I2C READ ERROR: %d\r\n", m_err_code );
    }
    while (m_xfer_done == false);
    APP_ERROR_CHECK( m_err_code );
}

/**
 * @brief TWI events handler.
 */
void twi_handler(nrf_drv_twi_evt_t const * p_event, void * p_context)
{
    switch (p_event->type)
    {
        case NRF_DRV_TWI_EVT_DONE:
            m_xfer_done = true;
            break;
        default:
            break;
    }
}

void twi_init(void){

    ret_code_t err_code;

    const nrf_drv_twi_config_t twi_LSM6DS33_config = {
       .scl                = SCL_PIN,
       .sda                = SDA_PIN,
       .frequency          = NRF_DRV_TWI_FREQ_400K,
       .interrupt_priority = APP_IRQ_PRIORITY_LOW,
       .clear_bus_init     = false
    };

    err_code = nrf_drv_twi_init(&m_twi, &twi_LSM6DS33_config, twi_handler, NULL);
    APP_ERROR_CHECK(err_code);

    nrf_drv_twi_enable(&m_twi);
}

TWI init and write

#ifndef PCA10059_H
#define PCA10059_H

#ifdef __cplusplus
extern "C" {
#endif

#include "nrf_gpio.h"

// LED definitions for PCA10059
// Each LED color is considered a separate LED
#define LEDS_NUMBER    4

#define LED1_G         NRF_GPIO_PIN_MAP(0,6)
#define LED2_R         NRF_GPIO_PIN_MAP(0,8)
#define LED2_G         NRF_GPIO_PIN_MAP(1,9)
#define LED2_B         NRF_GPIO_PIN_MAP(0,12)

#define LED_1          LED1_G
#define LED_2          LED2_R
#define LED_3          LED2_G
#define LED_4          LED2_B

#define LEDS_ACTIVE_STATE 0

#define LEDS_LIST { LED_1, LED_2, LED_3, LED_4 }

#define LEDS_INV_MASK  LEDS_MASK

#define BSP_LED_0      LED_1
#define BSP_LED_1      LED_2
#define BSP_LED_2      LED_3
#define BSP_LED_3      LED_4

// There is only one button for the application
// as the second button is used for a RESET.
#define BUTTONS_NUMBER 1

#define BUTTON_1       NRF_GPIO_PIN_MAP(1,6)
#define BUTTON_PULL    NRF_GPIO_PIN_PULLUP

#define BUTTONS_ACTIVE_STATE 0

#define BUTTONS_LIST { BUTTON_1 }

#define BSP_BUTTON_0   BUTTON_1

#define BSP_SELF_PINRESET_PIN NRF_GPIO_PIN_MAP(0,19)

#define SDA_PIN       NRF_GPIO_PIN_MAP(0,9)
#define SCL_PIN       NRF_GPIO_PIN_MAP(0,10)

#define HWFC           true

#ifdef __cplusplus
}
#endif

#endif // PCA10059_H

Pin define

RE: TWI communication issue with nRF52840 Dongle

awneil — Thu, 07 May 2020 16:21:34 GMT