SPI双机通信成功了，但有点小问题

七里香666 · 发表于 2019-8-5 10:13:32

我用的两块Mini板子，从机读取DS18B20的温度数据后传给主机，两块板子都用LCD显示数据。刚开始通信正常，但运行一会后主机会卡死，显示的温度数值是正常值的两倍（有时候还会抽风显示别的数），停止发送数据。希望大家能帮我看看

主机SPI.C
SPI_InitTypeDef  SPI_InitStructure;
void SPI1_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA|RCC_APB2Periph_SPI1, ENABLE );

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  //
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
  GPIO_SetBits(GPIOA,GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4; //片选
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;  //
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
  GPIO_ResetBits(GPIOA,GPIO_Pin_4);

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_256;  //
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; //
SPI_InitStructure.SPI_CRCPolynomial = 7; //
SPI_Init(SPI1, &SPI_InitStructure);  //

SPI_Cmd(SPI1, ENABLE); //

}

//写一个字节
u8 SPI1_Write_Byte(u8 TxData)
{
  u8 retry=0;
  while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET)
  {
retry++;
   if(retry>200)return 0;
  } //
SPI_I2S_SendData(SPI1, TxData); //
  return 0 ;
}
//读一个字节
u8 SPI_Read_Byte(u8 txdata)
{
u8 retry=0;
  while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET)
  {
retry++;
   if(retry>200)return 0;
  } //
return SPI_I2S_ReceiveData(SPI1); //
}

主机主函数
#include "led.h"
#include "delay.h"
#include "sys.h"
#include "usart.h"
#include "lcd.h"
#include "key.h"
#include "spi.h"
u8 DataRx=0;
int main()
{
delay_init();
uart_init(9600);
LED_Init();
SPI1_Init();
  LCD_Init();
KEY_Init();
POINT_COLOR=RED;
  LCD_ShowString(60,50,200,16,16,"START");
  while(1)
{
  LCD_ShowString(60,70,200,16,16,"reading");
  SPI1_Write_Byte(0x55);    //主机写，从机读
  DataRx=SPI_Read_Byte(0x00);  //主机读，从机写
  LCD_ShowNum(60,90,DataRx,2,16);  //显示
  LCD_ShowString(60,110,200,16,16,"read finish");
}
}

从机SPI.C
SPI_InitTypeDef  SPI_InitStructure;
void SPI1_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
//NVIC_InitTypeDef  NVIC_InitStructure;

RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA|RCC_APB2Periph_SPI1, ENABLE );

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;  //推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
  GPIO_SetBits(GPIOA,GPIO_Pin_6);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5| GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;  //浮空输入
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;  //片选
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);

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_High;  //
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge; //
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;  //
//SPI_InitStructure.SPI_NSS = SPI_NSS_Hard;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;  //
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7; //
SPI_Init(SPI1, &SPI_InitStructure);  //

SPI_Cmd(SPI1, ENABLE);

}

//写一个字节
u8 SPI1_Write_Byte(u8 TxData)
{
  u8 retry=0;
  while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET)
  {
retry++;
   if(retry>200)return 0;
  } //
SPI_I2S_SendData(SPI1, TxData); //
  return 0 ;
}

//读一个字节
u8 SPI_Read_Byte(u8 txdata)
{
u8 retry=0;
  while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET)
  {
retry++;
   if(retry>200)return 0;
  } //
return SPI_I2S_ReceiveData(SPI1); //
}

从机主函数
#include "led.h"
#include "delay.h"
#include "sys.h"
#include "usart.h"
#include "lcd.h"
#include "ds18b20.h"
#include "spi.h"
short temperature;
u8 slave_temp=0;
int main(void)
{
delay_init();
uart_init(9600);
LED_Init();
SPI1_Init();
  LCD_Init();
  POINT_COLOR=RED;

  while(DS18B20_Init())             // DS18B20初始化判断
{
  LCD_ShowString(60,130,200,16,16,"DS18B20 Error");
  delay_ms(200);
  LCD_Fill(60,130,239,130+16,WHITE);
delay_ms(200);
}
LCD_ShowString(60,130,200,16,16,"DS18B20 OK");
POINT_COLOR=BLUE;//
  LCD_ShowString(60,150,200,16,16,"Temp: . C");

while(1)
{
  temperature=DS18B20_Get_Temp();
  LCD_ShowNum(60+40+8,150,temperature/10,2,16); //
  LCD_ShowNum(60+40+32,150,temperature%10,1,16); //
slave_temp=SPI_Read_Byte(0x00);    //主机写，从机读
  SPI1_Write_Byte(temperature/10);       //主机读，从机写
  LCD_ShowNum(60,170,slave_temp,1,16);
}
}