Hi,
I am using nrf52840 customized dongle in our project. We have interfaced ADS1118 using spi communication with nrf52840 (customized dongle). The problem here with the spi communication is i am not able to read the data from the ADS1118 using spi communication i am reading the adc value as 0.
When we checked with the oscilloscope we are not getting clk signal ,MISO ,MOSI signal only Chip select is high.
I am here by attaching the code Please give me the solution what could be the problem.
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* Semiconductor ASA integrated circuit in a product or a software update for
* such product, must reproduce the above copyright notice, this list of
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* 3. Neither the name of Nordic Semiconductor ASA nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
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* 4. This software, with or without modification, must only be used with a
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*/
#include "nrf_drv_spi.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 "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"
#include "SEGGER_RTT.h"
#define SPI_INSTANCE 0 /**< SPI instance index. */
static const nrf_drv_spi_t spi = NRF_DRV_SPI_INSTANCE(SPI_INSTANCE); /**< SPI instance. */
static volatile bool spi_xfer_done; /**< Flag used to indicate that SPI instance completed the transfer. */
#define TEST_STRING "Nordic"
static uint8_t m_tx_buf[] = {0x0CB,0x9B}; //TEST_STRING; /**< TX buffer. */
static uint8_t m_rx_buf [2];//[sizeof(TEST_STRING) + 1]; /**< RX buffer. */
static const uint8_t m_length = sizeof(m_tx_buf); /**< Transfer length. */
static uint8_t m_tx_buf1[] = {0x00,0x00}; //TEST_STRING; /**< TX buffer. */
static uint8_t m_rx_buf1[2]; //TEST_STRING; /**< TX buffer. */
/**
* @brief SPI user event handler.
* @param event
*/
void spi_event_handler(nrf_drv_spi_evt_t const * p_event,
void * p_context)
{
spi_xfer_done = true;
NRF_LOG_INFO("Transfer completed.");
SEGGER_RTT_printf(0," Transfer completed\n");
for(int i=0;i<5;i++)
{
NRF_LOG_INFO("Data=%x\n.",m_rx_buf[i]);
}
if (m_rx_buf[0] != 0)
{
NRF_LOG_INFO(" Received:");
SEGGER_RTT_printf(0," Recieved\n");
NRF_LOG_HEXDUMP_INFO(m_rx_buf, strlen((const char *)m_rx_buf));
}
}
int main(void)
{
bsp_board_init(BSP_INIT_LEDS);
uint8_t data=0xff;
APP_ERROR_CHECK(NRF_LOG_INIT(NULL));
NRF_LOG_DEFAULT_BACKENDS_INIT();
nrf_drv_spi_config_t spi_config = NRF_DRV_SPI_DEFAULT_CONFIG;
spi_config.ss_pin = SPI_SS_PIN;
spi_config.miso_pin = SPI_MISO_PIN;
spi_config.mosi_pin = SPI_MOSI_PIN;
spi_config.sck_pin = SPI_SCK_PIN;
APP_ERROR_CHECK(nrf_drv_spi_init(&spi, &spi_config, spi_event_handler, NULL));
NRF_LOG_INFO("SPI example started.");
while (1)
{
// Reset rx buffer and transfer done flag
memset(m_rx_buf, 0, m_length);
spi_xfer_done = false;
nrf_gpio_cfg_output(31);
nrf_delay_us(100);
nrf_gpio_pin_clear(31);
nrf_delay_ms(100);
APP_ERROR_CHECK(nrf_drv_spi_transfer(&spi, m_tx_buf1, m_length, m_rx_buf1, m_length));
SEGGER_RTT_printf(0," Data Received1: %x\n",m_rx_buf1[0]);
SEGGER_RTT_printf(0," Data Received2: %x\n",m_rx_buf1[1]);
APP_ERROR_CHECK(nrf_drv_spi_transfer(&spi, m_tx_buf, m_length, m_rx_buf, m_length));
SEGGER_RTT_printf(0," Received1: %x\n",m_rx_buf[0]);
SEGGER_RTT_printf(0," Received2: %x\n",m_rx_buf[1]);
nrf_delay_ms(200);
nrf_delay_ms(200);
nrf_gpio_pin_set(31);
while (!spi_xfer_done)
{
__WFE();
}
NRF_LOG_FLUSH();
bsp_board_led_invert(BSP_BOARD_LED_0);
nrf_delay_ms(500);
}
}
