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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IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * */ /** @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. */ } } /** @} */