STM32F103C8T6 SPI主从通讯问题及待解决方案

                     STM32F103C8T6 SPI主从通讯问题及待解决方案

好久没有再碰STM32的程序，今天出于需求又把程序捡起来调试了一下，发现问题居多，以下就归纳总结以下：

1.我是用两块STM32F103C8T6进行SPI通讯，一块做主机，一块作为从机；

主机部分代码：

void SPI2_Config(void)//SPI2的传输配置
{
	SPI_InitTypeDef SPI_InitStructure;
	SPI_Cmd(SPI2, DISABLE);
	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_2Edge;
	SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
	SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
	SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;//SPI_FirstBit_MSB;
	SPI_InitStructure.SPI_CRCPolynomial = 7;
	SPI_Init(SPI2, &SPI_InitStructure);
	SPI_Cmd(SPI2, ENABLE);
}
void Spi2_Master_Fun(void)//SPI2端口配置
{		
	GPIO_InitTypeDef GPIO_InitStructure;
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);//使能GPIOB时钟
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);//使能spi2


	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //推挽复用
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13|GPIO_Pin_15;//sck mosi
	GPIO_Init(GPIOB,&GPIO_InitStructure);

	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_14;//miso
	GPIO_Init(GPIOB,&GPIO_InitStructure);

	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;//cs
	GPIO_Init(GPIOB,&GPIO_InitStructure);

	SPI2_Config();
	printf("MasterFunInitOver!\r\n");
}

//SPI读写数据：
unsigned char SPIWriteByte(unsigned char Byte)
{

	while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE) == RESET);		//等待发送区空	  
	SPI_I2S_SendData(SPI2, Byte);	 	            //发送一个byte  
	//delayms(100);	
	while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_RXNE) == RESET);      //等待接收完一个byte  
	return SPI_I2S_ReceiveData(SPI2);         	    //返回收到的数据			
}

void USART1_IRQHandler(void)//将串口的传过来的数据发送给从机
{
	u8 k;
	if(USART_GetITStatus(USART1,USART_IT_RXNE)!=RESET)//检查指定的USART中断发生与否
	{
		
//		k=USART_ReceiveData(USART1);
//		printf("Send_Data:%x\r\n",k);
		GPIO_ResetBits(GPIOB,GPIO_Pin_12);	
		SPIWriteByte(USART_ReceiveData(USART1));	
		
		GPIO_SetBits(GPIOB,GPIO_Pin_12);
	}
}

从机部分代码：

void SPI2_Slaver_Config(void)//从机配置
{
	SPI_InitTypeDef SPI_InitStructure;
	SPI_Cmd(SPI2, DISABLE);
	SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
	SPI_InitStructure.SPI_Mode = SPI_Mode_Slave;
	SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
	SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
	SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
	SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
	SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_64;
	SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;//SPI_FirstBit_MSB;
	SPI_InitStructure.SPI_CRCPolynomial = 7;
	SPI_Init(SPI2, &SPI_InitStructure);
	 /*Enable SPI1.NSS as a GPIO*/
	//SPI_SSOutputCmd(SPI1, ENABLE);
	SPI_Cmd(SPI2, ENABLE);
	SPI_I2S_ClearITPendingBit(SPI2, SPI_I2S_IT_RXNE);
	//spi1_cs_low;
}
/* 中断嵌套控制器配置 */
void NVIC_config(void)
{
NVIC_InitTypeDef NVIC_InitStructure;

/* 选择中断分组2 */
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_4);


/* 设置SPI1中断 */
NVIC_InitStructure.NVIC_IRQChannel = SPI2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 4;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 4;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}

void Spi2_Slaver_Fun(void)
{
		GPIO_InitTypeDef GPIO_InitStructure;
		RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);//使能GPIOB时钟
		RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);//使能spi2


		GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //推挽复用
		GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
		GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13|GPIO_Pin_15;//sck mosi
		GPIO_Init(GPIOB,&GPIO_InitStructure);

		GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
		GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
		GPIO_InitStructure.GPIO_Pin = GPIO_Pin_14;//miso
		GPIO_Init(GPIOB,&GPIO_InitStructure);

		GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
		GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
		GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;//cs
		GPIO_Init(GPIOB,&GPIO_InitStructure);
	
		NVIC_config();
		SPI_I2S_ITConfig(SPI2, SPI_I2S_IT_RXNE, ENABLE); 
		SPI2_Slaver_Config();
		printf("SlaverFunInitOver!\r\n");
}

void SPI2_IRQHandler(void)//接受数据并且打印到串口
{
	u8 i;
  if (SPI_I2S_GetITStatus(SPI2, SPI_I2S_IT_RXNE) == SET)
  {
		SPI_I2S_ClearITPendingBit(SPI2, SPI_I2S_IT_RXNE);
		while(SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_RXNE) == RESET);	
		i = SPI_I2S_ReceiveData(SPI2);
		printf("Receive_Data:%x\r\n",i);
		while(SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE) == RESET);
		SPI_I2S_SendData(SPI2, i);
		
		
  }	

延迟函数：

void delayms(u32 i)
{
	u32 temp;
	SysTick->CTRL=0X01;
	SysTick->LOAD=9000*i;
	SysTick->VAL=0X00;
	do
	{
		temp=SysTick->CTRL;	
	}
	while((temp&0x01)&&(!(temp&(1<<16))));
	SysTick->CTRL=0X00;
	SysTick->VAL=0X00;
}

main函数：

#include"stm32f10x.h"
#include "../APP/SPI/SPI.h"
#include "../APP/Usart/Uart.h"


#define Spi_Master 1
#define Spi_Slaver 0

int main(void)
{
	Uart1_Init_Config();
	
#if Spi_Master
	Spi2_Master_Fun();
	printf("Please Input:\r\n");
	while(1)
	{
		delayms(100);
	};
	
#endif
	
#if Spi_Slaver
	Spi2_Slaver_Fun();
	while(1);
#endif
}

接线图：

单片机1：NSS -> 单片机2:NSS

单片机1：SCK-> 单片机2:SCK

单片机1：MISO-> 单片机2:MISO

单片机1：MOSI-> 单片机2:MOSI

实验结果：

虽然进行慢速发没问题，但是将速度加到10ms后就会发生接收数据偏移错误，目前不知道是什么原因，希望有大侠可以告知根号的解决方案。