开发一个stm32 spi 通信程序
时间: 2023-05-14 14:04:42 浏览: 118
好的,我可以回答这个问题。以下是一个简单的基于STM32的SPI通信程序:
#include "stm32f4xx.h"
void SPI_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct;
SPI_InitTypeDef SPI_InitStruct;
// Enable clock for GPIOB
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
// Enable clock for SPI1
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
/* Configure SPI1 pins: SCK, MISO and MOSI */
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOB, &GPIO_InitStruct);
// Connect SPI1 pins to SPI alternate function
GPIO_PinAFConfig(GPIOB, GPIO_PinSource3, GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource4, GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource5, GPIO_AF_SPI1);
/* Configure SPI1 */
SPI_InitStruct.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStruct.SPI_Mode = SPI_Mode_Master;
SPI_InitStruct.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStruct.SPI_CPOL = SPI_CPOL_Low;
SPI_InitStruct.SPI_CPHA = SPI_CPHA_1Edge;
SPI_InitStruct.SPI_NSS = SPI_NSS_Soft;
SPI_InitStruct.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
SPI_InitStruct.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStruct.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStruct);
// Enable SPI1
SPI_Cmd(SPI1, ENABLE);
}
void SPI_SendData(uint8_t data)
{
// Wait until transmit buffer is empty
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
// Send data
SPI_I2S_SendData(SPI1, data);
// Wait until receive buffer is not empty
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);
// Read received data to clear RXNE flag
SPI_I2S_ReceiveData(SPI1);
}
int main(void)
{
// Initialize SPI
SPI_Init();
// Send data
SPI_SendData(0x55);
while (1);
return 0;
}