Hi, I'm using nRF52 DK (nRF52832) to detect my sensor. The sensor I2C address is 0x21 (verified by Arduino UNO).
My nRF52 DK (master) could detect the slave sensor before. But after I changed code somewhere (I forgot), the nRF52 DK cannot detect the slave sensor anymore. Any idea, pls? Thank you!
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/** @file
* @defgroup tw_scanner main.c
* @{
* @ingroup nrf_twi_example
* @brief TWI Sensor Example main file.
*
* This file contains the source code for a sample application using TWI.
*
*/
#include <stdbool.h>
#include <stdint.h>
#include "nrf_delay.h"
#include <stdio.h>
#include "boards.h"
#include "app_util_platform.h"
#include "app_error.h"
#include "nrf_drv_twi.h"
#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"
/* TWI instance ID. */
#if TWI0_ENABLED
#define TWI_INSTANCE_ID 0
#elif TWI1_ENABLED
#define TWI_INSTANCE_ID 1
#endif
/* Number of possible TWI addresses. */
#define TWI_ADDRESSES 127
/* TWI instance. */
static const nrf_drv_twi_t m_twi = NRF_DRV_TWI_INSTANCE(TWI_INSTANCE_ID);
/**
* @brief TWI initialization.
*/
void twi_init (void)
{
ret_code_t err_code;
const nrf_drv_twi_config_t twi_config = {
.scl = ARDUINO_SCL_PIN,
.sda = ARDUINO_SDA_PIN,
.frequency = NRF_DRV_TWI_FREQ_100K,
.interrupt_priority = APP_IRQ_PRIORITY_HIGH,
.clear_bus_init = false
};
/**
* @brief Function for initializing the TWI driver instance.
*
* @param[in] p_instance Pointer to the driver instance structure.
* @param[in] p_config Initial configuration.
* @param[in] event_handler Event handler provided by the user. If NULL, blocking mode is enabled.
* @param[in] p_context Context passed to event handler.
*
* @retval NRF_SUCCESS If initialization was successful.
* @retval NRF_ERROR_INVALID_STATE If the driver is in invalid state.
* @retval NRF_ERROR_BUSY If some other peripheral with the same
* instance ID is already in use. This is
* possible only if PERIPHERAL_RESOURCE_SHARING_ENABLED
* is set to a value other than zero.
*/
err_code = nrf_drv_twi_init(&m_twi, &twi_config, NULL, NULL);
APP_ERROR_CHECK(err_code);
nrf_drv_twi_enable(&m_twi);
NRF_LOG_INFO("TWI enabled");
}
/**
* @brief Function for main application entry.
*/
int main(void)
{
ret_code_t err_code;
uint8_t address;
uint8_t sample_data[9];
bool detected_device = false;
APP_ERROR_CHECK(NRF_LOG_INIT(NULL));
NRF_LOG_DEFAULT_BACKENDS_INIT();
NRF_LOG_INFO("TWI scanner started.");
NRF_LOG_FLUSH();
twi_init();
/* Configure board. */
bsp_board_init(BSP_INIT_LEDS);
for (address = 0; address < TWI_ADDRESSES; address++)
{
/**
* @brief Function for reading data from a TWI slave.
*
* The transmission will be stopped when an error occurs. If a transfer is ongoing,
* the function returns the error code @ref NRF_ERROR_BUSY.
*
* @param[in] p_instance Pointer to the driver instance structure.
* @param[in] address Address of a specific slave device (only 7 LSB).
* @param[in] p_data Pointer to a receive buffer.
* @param[in] length Number of bytes to be received.
*
* @retval NRF_SUCCESS If the procedure was successful.
* @retval NRF_ERROR_BUSY If the driver is not ready for a new transfer.
* @retval NRF_ERROR_INTERNAL If an error was detected by hardware.
* @retval NRF_ERROR_DRV_TWI_ERR_OVERRUN If the unread data was replaced by new data
* @retval NRF_ERROR_DRV_TWI_ERR_ANACK If NACK received after sending the address in polling mode.
* @retval NRF_ERROR_DRV_TWI_ERR_DNACK If NACK received after sending a data byte in polling mode.
*/
err_code = nrf_drv_twi_rx(&m_twi, address, sample_data, sizeof(sample_data));
if (err_code == NRF_SUCCESS)
{
detected_device = true;
NRF_LOG_INFO("TWI device detected at address decimal %d = hex 0x%x.",address ,address);
NRF_LOG_FLUSH();
}
NRF_LOG_FLUSH();
}
if (!detected_device)
{
NRF_LOG_INFO("No device was found.");
NRF_LOG_FLUSH();
}
while (true)
{
/* Empty loop. */
}
}
/** @} */
