如何解决STM32:简单的SPI传输
我正在与STM32F3disCOVERY板一起工作,并且试图深入研究HAL的抽象。我制作了一个简单的函数版本,该函数可以通过SPI传输数据,但遗憾的是它不起作用(至少我将其发送到的DAC不会更改状态),而且我不确定在那里缺少什么。初始化代码中可能还有一些不适用于我的简单版本。我很乐意提供任何指导或参考。谢谢!
#include <stm32f3xx_hal.h>
#define PINS_SPI GPIO_PIN_5 | GPIO_PIN_7
#define GPIO_PORT GPIOA
/* This is the simplest function I Could come up with to do the transfer but I'm clearly missing something here */
uint8_t SPI_SendReceive(SPI_HandleTypeDef *hspi,uint8_t data) {
/* Loop while DR register in not empty */
while ((hspi->Instance->SR & SPI_FLAG_TXE) == RESET) {
}
/* Send data through the SPI1 peripheral */
hspi->Instance->DR = data;
/* Wait to receive data */
while ((hspi->Instance->SR & SPI_FLAG_RXNE) == RESET) {
}
return hspi->Instance->DR;
}
int main() {
HAL_Init();
__HAL_RCC_GPIOA_CLK_ENABLE();
__HAL_RCC_SPI1_CLK_ENABLE();
static SPI_HandleTypeDef spi = {.Instance = SPI1};
spi.Init.BaudratePrescaler = SPI_BAUdratEPRESCALER_256;
spi.Init.Direction = SPI_DIRECTION_2LInes;
spi.Init.CLKPhase = SPI_PHASE_1EDGE;
spi.Init.CLKPolarity = SPI_POLARITY_LOW;
spi.Init.CRCCalculation = SPI_CRCCALculaTION_disABLE;
spi.Init.DataSize = SPI_DATASIZE_8BIT;
spi.Init.FirstBit = SPI_FirsTBIT_MSB;
spi.Init.NSS = SPI_NSS_HARD_OUTPUT;
spi.Init.TIMode = SPI_TIMODE_disABLE;
spi.Init.Mode = SPI_MODE_MASTER;
HAL_SPI_Init(&spi);
__HAL_SPI_ENABLE(&spi);
GPIO_InitTypeDef GPIO_InitStruct;
GPIO_InitStruct.Pin = PINS_SPI;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF5_SPI1;
HAL_GPIO_Init(GPIOA,&GPIO_InitStruct);
GPIO_InitStruct.Pin = GPIO_PIN_4;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
HAL_GPIO_Init(GPIOA,&GPIO_InitStruct);
/* TI 8564 DAC Settings */
uint8_t cmd1 = 0b00010000;
/* DAC output value (16-bit) */
uint16_t cmd23 = 0;
uint8_t cmd2 = cmd23 >> 8;
uint8_t cmd3 = cmd23 & 0xff;
uint8_t command[3] = {cmd1,cmd2,cmd3};
while (true) {
HAL_GPIO_WritePin(GPIOA,GPIO_PIN_4,GPIO_PIN_RESET);
/* This does not work :( */
SPI_SendReceive(&spi,command[0]);
SPI_SendReceive(&spi,command[1]);
SPI_SendReceive(&spi,command[2]);
/* This works! When commenting in the lines above and commenting this out */
/* HAL_SPI_Transmit(&spi,command,3,HAL_MAX_DELAY); */
HAL_GPIO_WritePin(GPIOA,GPIO_PIN_SET);
HAL_Delay(1000);
}
}
解决方法
检查HAL_SPI_Init的内容。此函数很可能会调用另一个应该进行低级初始化的函数,您有责任自己提供此函数。更复杂的是,这个所谓的第二个函数已经定义了“虚拟”弱别名,因此工具链不会返回任何错误,而只是构建无法执行任何操作的代码。
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