STM32F103标准库函数实现SPI通信
时间: 2023-10-31 12:05:38 浏览: 49
STM32F103标准库提供了一些函数来实现SPI通信,以下是SPI主设备的发送数据和接收数据的示例代码:
```c
#include "stm32f10x.h"
void SPI_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
SPI_InitTypeDef SPI_InitStructure;
// 使能SPI对应的GPIO时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
// 使能SPI时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
// 配置SPI对应的GPIO
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_IPU;
GPIO_Init(GPIOA, &GPIO_InitStructure);
// 配置SPI
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_High;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_Init(SPI1, &SPI_InitStructure);
// 使能SPI
SPI_Cmd(SPI1, ENABLE);
}
uint8_t SPI_SendByte(uint8_t data)
{
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
SPI_I2S_SendData(SPI1, data);
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);
return SPI_I2S_ReceiveData(SPI1);
}
void SPI_SendData(uint8_t* data, uint32_t len)
{
for (uint32_t i = 0; i < len; i++)
{
SPI_SendByte(data[i]);
}
}
void SPI_ReceiveData(uint8_t* data, uint32_t len)
{
for (uint32_t i = 0; i < len; i++)
{
data[i] = SPI_SendByte(0xFF);
}
}
```
上述代码中,`SPI_Configuration`函数用于配置SPI,`SPI_SendByte`函数用于发送一个字节的数据并接收一个字节的数据,`SPI_SendData`函数用于发送一串数据,`SPI_ReceiveData`函数用于接收一串数据。使用时,只需要调用这些函数即可完成SPI通信。