Hello,
I'm a beginner and I have lots of questions. So I wanna communication with MCP4110 chip. But I can't. I configured SS, MISO and CLK pin in sdk_config.h. (SEGGER Embedded Studio, Mac OS). So I wrote this code:
#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"
#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. */
static const nrf_drv_spi_t m_spi_master_0 = NRF_DRV_SPI_INSTANCE(0);
#define ContrReg "{0x21, 0x00}" //constant
#define FreqRegL "{0x4D, 0xB8}" //90C7
#define FreqRegM "{0x40, 0x1A}" //8000
#define PhaseReg "{0xC0, 0x00}" //constant
#define Exit_Reg "{0x11, 0x10}" //constant
#define Potmeter "{0x11, 0x11}" //0x1_ write data, 0x2_ shut down, 0x_0 no ch, 0x_1 0.ch; value
#define High 1
static uint8_t m_tx_buf0[] = ContrReg; // SINGEN_DATA
static uint8_t m_tx_buf1[] = FreqRegL; // SINGEN_DATA
static uint8_t m_tx_buf2[] = FreqRegM; // SINGEN_DATA
static uint8_t m_tx_buf3[] = PhaseReg; // SINGEN_DATA
static uint8_t m_tx_buf4[] = Exit_Reg; // SINGEN_DATA
static uint8_t m_tx_buf5[] = Potmeter; // POTMETER_DATA
static uint8_t m_rx_buf[sizeof(NULL) + 1]; /**< RX buffer. */
static const uint8_t m_length0 = sizeof(m_tx_buf5); /**< Transfer length. */
//static const uint8_t m_length1 = sizeof(m_tx_buf1); /**< Transfer length. */
//static const uint8_t m_length2 = sizeof(m_tx_buf2); /**< Transfer length. */
//static const uint8_t m_length3 = sizeof(m_tx_buf3); /**< Transfer length. */
//static const uint8_t m_length4 = sizeof(m_tx_buf4); /**< Transfer length. */
//static const uint8_t m_length5 = sizeof(m_tx_buf5); /**< Transfer length. */
void spi_event_handler(nrf_drv_spi_evt_t const * p_event,
void * p_context)
{
spi_xfer_done = true;
NRF_LOG_INFO("Transfer completed.");
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)
{
nrf_gpio_pin_dir_set(SPI_SS_PIN, '1');
bsp_board_init(BSP_INIT_LEDS);
//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.sck_pin = SPI_SCK_PIN;
nrf_gpio_pin_dir_set(SPI_SS_PIN, NULL);
spi_config.frequency = NRF_SPIM_FREQ_125K;
spi_config.mode = NRF_DRV_SPI_MODE_0;
spi_config.bit_order = NRF_SPI_BIT_ORDER_LSB_FIRST;
spi_config.ss_pin = NRF_DRV_SPI_PIN_NOT_USED;
spi_config.miso_pin = NRF_DRV_SPI_PIN_NOT_USED;
//APP_ERROR_CHECK(nrf_drv_spi_init(&m_spi_master_0, &spi_config, spi_event_handler, NULL));
//APP_ERROR_CHECK(nrf_drv_spi_init(&spi, &spi_config, spi_event_handler, NULL));
uint32_t err_code = nrf_drv_spi_init(&m_spi_master_0, &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_length0);
spi_xfer_done = false;
//APP_ERROR_CHECK(nrf_drv_spi_transfer(&spi, m_tx_buf0, m_length0, NULL, NULL));
/*
err_code = nrf_drv_spi_transfer(&m_spi_master_0, m_tx_buf0, sizeof(m_tx_buf0), m_rx_buf, sizeof(m_rx_buf));
APP_ERROR_CHECK(err_code);
nrf_delay_us(2);
err_code = nrf_drv_spi_transfer(&m_spi_master_0, m_tx_buf1, sizeof(m_tx_buf1), m_rx_buf, sizeof(m_rx_buf));
APP_ERROR_CHECK(err_code);
nrf_delay_us(2);
err_code = nrf_drv_spi_transfer(&m_spi_master_0, m_tx_buf2, sizeof(m_tx_buf2), m_rx_buf, sizeof(m_rx_buf));
APP_ERROR_CHECK(err_code);
nrf_delay_us(2);
err_code = nrf_drv_spi_transfer(&m_spi_master_0, m_tx_buf3, sizeof(m_tx_buf3), m_rx_buf, sizeof(m_rx_buf));
APP_ERROR_CHECK(err_code);
nrf_delay_us(2);
err_code = nrf_drv_spi_transfer(&m_spi_master_0, m_tx_buf4, sizeof(m_tx_buf4), m_rx_buf, sizeof(m_rx_buf));
APP_ERROR_CHECK(err_code);
nrf_delay_ms(2);*/
err_code = nrf_drv_spi_transfer(&m_spi_master_0, m_tx_buf5, sizeof(m_tx_buf5), m_rx_buf, sizeof(m_rx_buf));
APP_ERROR_CHECK(err_code);
//while(1){};
while (!spi_xfer_done)
{
__WFE();
}
NRF_LOG_FLUSH();
while(1){};
}
}
(0-4 buffers is sinus generator data, later I want to use 2 spi. First they should operate separately.)
My experience MISO pin always show 1.2V and CLK 0V. The CLK will be 0 if communication is ended? The digital potetiometer's wiper can't move. I check ohm from wiper to A pin, and B is 0V.
1) What do you think abaut my code? Where I made fault?
2) If you have a good spi code what is use 2 channel I'll be very happy:)
3) I want to use the potentiometer ({0x11, 0x00-FF}) get data from bluetooth.
4) Finally, If I have a good code in DK I want to write this code nRF52840 dongle.
Thanks your answers.
Regards,
Beni
