当试图使2个SPI主设备同时工作时，我遇到了问题。它们都有不同的引脚（mosi，味o，sck，ss），一个由SD卡使用，另一个由加速度计使用。我的设备是nRF52832，我一直在尝试使用nRF52 SDK 15.2.0中的SPI驱动程序。
我不确定它们是否可以同时初始化和使用，但是如果程序需要在与另一个spi实例进行通信时进行初始化和取消初始化，则感觉很不对劲。
似乎每当初始化一个实例时，第二个实例就无法正常工作。该程序没有给出任何错误。这是我对嵌入式系统的第一次接触，因此，我的技能水平是新手。我真的很感谢所有帮助。
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/** @file
* @defgroup fatfs_example_main main.c
* @{
* @ingroup fatfs_example
* @brief FATFS Example Application main file.
*
* This file contains the source code for a sample application using FAT filesystem and SD card library.
*
*/
#include "nrf.h"
#include "bsp.h"
#include "ff.h"
#include "diskio_blkdev.h"
#include "nrf_block_dev_sdc.h"
#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"
#include "nrf_gpio.h"
#include "nrf_delay.h"
#include "nrf_drv_spi.h"
#define FILE_NAME "NORDIC.TXT"
#define TEST_STRING "SD card example."
#define SDC_SCK_PIN 16 ///< SDC serial clock (SCK) pin.
#define SDC_MOSI_PIN 17 ///< SDC serial data in (DI) pin.
#define SDC_MISO_PIN 18 ///< SDC serial data out (DO) pin.
#define SDC_CS_PIN 11 ///< SDC chip select (CS) pin.
#define SDC2_SCK_PIN 5
#define SDC2_MOSI_PIN 4
#define SDC2_MISO_PIN 3
#define SDC2_CS_PIN 12
#define SPI_AC_INSTANCE 1
static const nrf_drv_spi_t spi = NRF_DRV_SPI_INSTANCE(SPI_AC_INSTANCE);
/**
* @brief SDC block device definition
* */
NRF_BLOCK_DEV_SDC_DEFINE(
m_block_dev_sdc,
NRF_BLOCK_DEV_SDC_CONFIG(
SDC_SECTOR_SIZE,
APP_SDCARD_CONFIG(SDC_MOSI_PIN, SDC_MISO_PIN, SDC_SCK_PIN, SDC_CS_PIN)
),
NFR_BLOCK_DEV_INFO_CONFIG("Nordic", "SDC", "1.00")
);
/**
* @brief Function for demonstrating FAFTS usage.
*/
static void fatfs_example()
{
static FATFS fs;
static DIR dir;
static FILINFO fno;
static FIL file;
uint32_t bytes_written;
FRESULT ff_result;
DSTATUS disk_state = STA_NOINIT;
// Initialize FATFS disk I/O interface by providing the block device.
static diskio_blkdev_t drives[] =
{
DISKIO_BLOCKDEV_CONFIG(NRF_BLOCKDEV_BASE_ADDR(m_block_dev_sdc, block_dev), NULL)
};
diskio_blockdev_register(drives, ARRAY_SIZE(drives));
NRF_LOG_INFO("Initializing disk 0 (SDC)...");
for (uint32_t retries = 3; retries && disk_state; --retries)
{
disk_state = disk_initialize(0);
}
if (disk_state)
{
NRF_LOG_INFO("Disk initialization failed.");
return;
}
uint32_t blocks_per_mb = (1024uL * 1024uL) / m_block_dev_sdc.block_dev.p_ops->geometry(&m_block_dev_sdc.block_dev)->blk_size;
uint32_t capacity = m_block_dev_sdc.block_dev.p_ops->geometry(&m_block_dev_sdc.block_dev)->blk_count / blocks_per_mb;
NRF_LOG_INFO("Capacity: %d MB", capacity);
NRF_LOG_INFO("Mounting volume...");
ff_result = f_mount(&fs, "", 1);
if (ff_result)
{
NRF_LOG_INFO("Mount failed.");
return;
}
NRF_LOG_INFO("\r\n Listing directory: /");
ff_result = f_opendir(&dir, "/");
if (ff_result)
{
NRF_LOG_INFO("Directory listing failed!");
return;
}
do
{
ff_result = f_readdir(&dir, &fno);
if (ff_result != FR_OK)
{
NRF_LOG_INFO("Directory read failed.");
return;
}
if (fno.fname[0])
{
if (fno.fattrib & AM_DIR)
{
NRF_LOG_RAW_INFO(" <DIR> %s",(uint32_t)fno.fname);
}
else
{
NRF_LOG_RAW_INFO("%9lu %s", fno.fsize, (uint32_t)fno.fname);
}
}
}
while (fno.fname[0]);
NRF_LOG_RAW_INFO("");
NRF_LOG_INFO("Writing to file " FILE_NAME "...");
ff_result = f_open(&file, FILE_NAME, FA_READ | FA_WRITE | FA_OPEN_APPEND);
if (ff_result != FR_OK)
{
NRF_LOG_INFO("Unable to open or create file: " FILE_NAME ".");
return;
}
ff_result = f_write(&file, TEST_STRING, sizeof(TEST_STRING) - 1, (UINT *) &bytes_written);
if (ff_result != FR_OK)
{
NRF_LOG_INFO("Write failed\r\n.");
}
else
{
NRF_LOG_INFO("%d bytes written.", bytes_written);
}
(void) f_close(&file);
return;
}
static uint8_t tx_buf[3];
static uint8_t rx_buf[10]; /**< RX buffer. */
uint8_t accReadByte(uint8_t RegisterAddress)
{
tx_buf[0] = 0x7F & RegisterAddress;
tx_buf[1] = 0x80 & RegisterAddress;
APP_ERROR_CHECK(nrf_drv_spi_transfer(&spi, tx_buf, 2, rx_buf, 1+2));
return rx_buf[2];
}
void initAcc()
{
//nrf_gpio_set_cfg_output(SDC2_CS_PIN);
nrf_drv_spi_config_t spi_config = NRF_DRV_SPI_DEFAULT_CONFIG;
spi_config.ss_pin = SDC2_CS_PIN;
spi_config.miso_pin = SDC2_MISO_PIN;
spi_config.mosi_pin = SDC2_MOSI_PIN;
spi_config.sck_pin = SDC2_SCK_PIN;
spi_config.frequency = NRF_SPI_FREQ_250K;
APP_ERROR_CHECK(nrf_drv_spi_init(&spi, &spi_config, NULL, NULL));
}
/**
* @brief Function for main application entry.
*/
int main(void)
{
bsp_board_init(BSP_INIT_LEDS);
APP_ERROR_CHECK(NRF_LOG_INIT(NULL));
NRF_LOG_DEFAULT_BACKENDS_INIT();
NRF_LOG_INFO("FATFS example started.");
fatfs_example();
initAcc();
if ( accReadByte(0x0D) == 0x6A )
{
NRF_LOG_INFO("Got right whoami!");
}
while (true)
{
__WFE();
}
}
/** @} */
答案 0 :(得分：0)
问题解决了。默认情况下，SD卡和加速度计都有不同的串行总线。当第一次初始化另一个时，第二次初始化总线失败，这导致nRF52832无法获得正确的答案。