SPI读取flash的ID返回值为0xffffff

Howie000 · 发表于 2021-5-29 18:12:30

以下是调用函数程序

这个是原理图

#include  "SPI_FLASH.h"
#include  <stdio.h>

//SPI2_SCK  PB13
//SPI2_MOSI PB15
//SPI2_MISO PB14
//F_CS    PB12
int Time;

int fgetc(FILE *f)
{
while(USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == 0);

return(int)USART_ReceiveData(USART1);
}

uint8_t Error_code1(uint8_t num)
{
  printf("error code is %d",num);
}

static void GPIO_INITIAL()
{
GPIO_InitTypeDef  GPIO_InitStructure;

//开启GPIOB和SPI2的时钟，APB1挂在SPI2， APB2挂载GPIOB
   RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);
   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);

//PB12
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Pin=SPI2_FCS_PIN;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOB,&GPIO_InitStructure);

//PB13
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Pin=SPI2_SCK_PIN;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOB,&GPIO_InitStructure);

//PB14
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Pin=SPI2_MISO_PIN;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOB,&GPIO_InitStructure);

//PB15
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Pin=SPI2_MOSI_PIN;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOB,&GPIO_InitStructure);

SPI2_stop_high1;
}

static void SPI_INITIAL()
{
SPI_InitTypeDef SPI_InitStructure;
SPI_InitStructure.SPI_BaudRatePrescaler=SPI_BaudRatePrescaler_8;
SPI_InitStructure.SPI_CPHA=SPI_CPHA_2Edge;
SPI_InitStructure.SPI_CPOL= SPI_CPOL_High;
SPI_InitStructure.SPI_CRCPolynomial=0;
SPI_InitStructure.SPI_DataSize=SPI_DataSize_8b;
SPI_InitStructure.SPI_Direction=SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_FirstBit=SPI_FirstBit_MSB;
SPI_InitStructure.SPI_Mode=SPI_Mode_Master;
SPI_InitStructure.SPI_NSS= SPI_NSS_Soft;;

SPI_Init(SPI2,&SPI_InitStructure);
SPI_Cmd(SPI2,ENABLE);
}

void SPI_FLASH_INITIAL()
{
GPIO_INITIAL();
SPI_INITIAL();
printf("初始化没问题\n");
}

uint8_t SPI_SENT(uint8_t Data)
{

Time=10000;
while(SPI_I2S_GetFlagStatus (SPI2,SPI_I2S_FLAG_TXE)==RESET)
{
if(Time--==0)
{
   return Error_code1(0);
}
}
SPI_I2S_SendData ( SPI2,Data);
Time=10000;
while(SPI_I2S_GetFlagStatus  (SPI2,SPI_I2S_FLAG_RXNE)==RESET)
{
if(Time--==0)
{
   return Error_code1(1);
}
}
return SPI_I2S_ReceiveData (SPI2);
}

//uint8_t SPI_READ_DATA()
//{
//}

uint32_t READ_FLASH_ID_DATA(void)
{
uint32_t temp=0,temp0=0,temp1=0,temp2=0;

SPI2_start_low1;
SPI_SENT(0x9F);

temp0=SPI_SENT(0x00);
temp1=SPI_SENT(0x00);
temp2=SPI_SENT(0x00);

SPI2_stop_high1;

printf("读取ID\n");

temp=(temp0<<16)|(temp1<<8)|temp2;

return  temp;
}

头文件

#ifndef SPI_FLASH
#define SPI_FLASH

//SPI2_SCK  PB13
//SPI2_MOSI PB15
//SPI2_MISO PB14
//F_CS    PB12

#include "stm32f10x.h"

#define FLASHX SPI2

#define SPI2_SCK_PIN       GPIO_Pin_13
#define SPI2_MOSI_PIN       GPIO_Pin_15
#define SPI2_MISO_PIN       GPIO_Pin_14
#define SPI2_FCS_PIN       GPIO_Pin_12

#define  SPI2_stop_high1    GPIO_SetBits( GPIOB, SPI2_FCS_PIN )
#define  SPI2_start_low1 GPIO_ResetBits(GPIOB, SPI2_FCS_PIN)

uint32_t READ_FLASH_ID_DATA();
void SPI_FLASH_INITIAL();
uint8_t SPI_READ_DATA();

#endif

主程序

int main(void)
{
   uint32_t ID=0;


   Usart_inial();
   printf("这是一个SPI通讯实验\n");

   SPI_FLASH_INITIAL();

   ID=READ_FLASH_ID_DATA();

   printf("ID=0x%x\n",ID);

}

发送0x9f之后返回值一直是0xffff 找了一天也没找到问题出在哪里了，请大佬们看看。不胜感激