STM32单片机SPI通信双向全双工的标准库C语言程序
时间: 2023-12-28 21:24:29 浏览: 86
以下是一个简单的STM32单片机SPI通信双向全双工的标准库C语言程序,您可以根据您的具体需求进行修改:
```c
#include "stm32f10x.h"
void SPI_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
SPI_InitTypeDef SPI_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_SPI1, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
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_8;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStructure);
SPI_Cmd(SPI1, ENABLE);
}
uint8_t SPI_ExchangeByte(SPI_TypeDef* SPIx, uint8_t byte)
{
while(SPI_I2S_GetFlagStatus(SPIx, SPI_I2S_FLAG_TXE) == RESET);
SPI_I2S_SendData(SPIx, byte);
while(SPI_I2S_GetFlagStatus(SPIx, SPI_I2S_FLAG_RXNE) == RESET);
return SPI_I2S_ReceiveData(SPIx);
}
int main(void)
{
uint8_t tx_data = 0x55, rx_data;
SPI_Configuration();
while(1)
{
rx_data = SPI_ExchangeByte(SPI1, tx_data);
}
}
```
在这个程序中,我们使用SPI1作为主设备,配置为全双工模式。在主设备中,我们使用SPI_ExchangeByte()函数来发送和接收数据。此函数的作用是:首先等待SPI传输缓冲区为空,然后发送要发送的数据。然后等待接收缓冲区有数据,最后返回接收到的数据。主程序中,我们将不断发送一个字节,并接收到一个字节。
阅读全文