Hi everybody! My application is based on SDK 17.02. I try to communicate with an spi device using spim driver and the code is basically based on the nrfx-spim example.
After some effort, now I managed to get the right signals on a oscilloscope. But I just cannot get the input in my application. Any suggestion is largely appreciated
Below are my code.
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#include "nrfx_spim.h"
#include "app_util_platform.h"
#include "nrf_gpio.h"
#include "nrf_delay.h"
#include "boards.h"
#include "app_error.h"
#include <string.h>
#include "SEGGER_RTT.h"
#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"
#define NRFX_SPIM_SCK_PIN NRF_GPIO_PIN_MAP(1,9)
#define NRFX_SPIM_MOSI_PIN NRF_GPIO_PIN_MAP(0,6)
#define NRFX_SPIM_MISO_PIN NRF_GPIO_PIN_MAP(0,5)
#define NRFX_SPIM_SS_PIN NRF_GPIO_PIN_MAP(0,8)
//#define NRFX_SPIM_DCX_PIN 30
#define SPI_INSTANCE 3 /**< SPI instance index. */
static const nrfx_spim_t spi = NRFX_SPIM_INSTANCE(SPI_INSTANCE); /**< SPI instance. */
static volatile bool spi_xfer_done; /**< Flag used to indicate that SPI instance completed the transfer. */
#define BUF_LEN 128
static uint8_t m_tx_buf[BUF_LEN] ; /**< TX buffer. */
static uint8_t m_rx_buf[BUF_LEN] ; /**< RX buffer. */
static const uint8_t m_length = sizeof(m_tx_buf); /**< Transfer length. */
void spim_event_handler(nrfx_spim_evt_t const * p_event,
void * p_context)
{
spi_xfer_done = true;
NRF_LOG_INFO("Transfer completed.");
NRF_LOG_INFO("RX buf:");
NRF_LOG_HEXDUMP_INFO(m_rx_buf, strlen((const char *)m_rx_buf));
// if (m_rx_buf[0] != 0)
// {
// NRF_LOG_INFO(" Received:");
// NRF_LOG_HEXDUMP_INFO(m_rx_buf, strlen((const char *)m_rx_buf));
// }
}
int main(void)
{
bsp_board_init(BSP_INIT_LEDS);
APP_ERROR_CHECK(NRF_LOG_INIT(NULL));
NRF_LOG_DEFAULT_BACKENDS_INIT();
m_tx_buf[0] = 0x93;
m_tx_buf[1] = 0xff;
nrfx_spim_xfer_desc_t xfer_desc = NRFX_SPIM_XFER_TRX(m_tx_buf, 2, m_rx_buf, 2);
nrfx_spim_config_t spi_config = NRFX_SPIM_DEFAULT_CONFIG;
spi_config.frequency = NRF_SPIM_FREQ_500K;
spi_config.ss_pin = NRFX_SPIM_SS_PIN;
spi_config.miso_pin = NRFX_SPIM_MISO_PIN;
spi_config.mosi_pin = NRFX_SPIM_MOSI_PIN;
spi_config.sck_pin = NRFX_SPIM_SCK_PIN;
spi_config.mode = NRF_SPIM_MODE_3;
spi_config.use_hw_ss = false;
spi_config.ss_active_high = false;
// spi_config.rx_delay = 0x02;
// spi_config.ss_duration = 0x02;
APP_ERROR_CHECK(nrfx_spim_init(&spi, &spi_config, spim_event_handler, NULL));
while (1)
{
// Reset rx buffer and transfer done flag
memset(m_rx_buf, 0, m_length);
spi_xfer_done = false;
APP_ERROR_CHECK(nrfx_spim_xfer(&spi, &xfer_desc, 0));
while (!spi_xfer_done)
{
__WFE();
}
NRF_LOG_FLUSH();
bsp_board_led_invert(BSP_BOARD_LED_0);
nrf_delay_ms(200);
}
}
