STM32F407 SPI发送数据
时间: 2023-09-14 13:11:26 浏览: 360
以下是STM32F407的SPI发送数据的示例代码:
```c
#include "stm32f4xx.h"
#define SPIx SPI1
void SPI_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
SPI_InitTypeDef SPI_InitStructure;
// 使能SPI时钟和GPIO时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
// 配置SPI引脚
GPIO_PinAFConfig(GPIOA, GPIO_PinSource5, GPIO_AF_SPI1); // SCK
GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_SPI1); // MISO
GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_SPI1); // MOSI
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &GPIO_InitStructure);
// 配置SPI
SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Tx;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPIx, &SPI_InitStructure);
SPI_Cmd(SPIx, ENABLE);
}
void SPI_SendData(uint8_t data)
{
// 等待发送缓冲区为空
while (SPI_I2S_GetFlagStatus(SPIx, SPI_I2S_FLAG_TXE) == RESET);
// 发送数据
SPI_I2S_SendData(SPIx, data);
// 等待发送完成
while (SPI_I2S_GetFlagStatus(SPIx, SPI_I2S_FLAG_BSY) == SET);
}
int main(void)
{
SPI_Init();
while (1)
{
// 发送数据
SPI_SendData(0x55);
}
}
```
在上面的代码中,首先在SPI初始化函数`SPI_Init()`中配置了SPI引脚和SPI参数。然后,`SPI_SendData()`函数用于发送数据,它首先等待发送缓冲区为空,然后发送数据,并等待发送完成。在`main()`函数中,不断发送数据。
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