SPI 实验怎么读取不了ID？？困惑了一天了到底哪里出毛病了

xc1989 · 发表于 2013-11-15 23:19:40

#include "SpiFlash.h"

#include "stm32f10x_spi.h"

void SPI2_Init(void)

{

GPIO_InitTypeDef GPIO_InitStructure;

SPI_InitTypeDef SPI_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE); //?ò???±??

RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2,ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15; // 13 14 15 ??SPI?????è??????

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

GPIO_Init(GPIOB,&GPIO_InitStructure);

GPIO_SetBits(GPIOB,GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15); //PB13/14/15????

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12; //12??????????CS????

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

GPIO_Init(GPIOB,&GPIO_InitStructure);

SPI_FLASH_CS = 1;

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_2;

SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;

SPI_InitStructure.SPI_CRCPolynomial = 7;

SPI_Init( SPI2, &SPI_InitStructure);

SPI_Cmd( SPI2, ENABLE);

}

uint8_t SPI2_ReadWriteByte(uint8_t TxData)

{

while(SPI_I2S_GetFlagStatus( SPI2, SPI_I2S_FLAG_TXE) == RESET);//????·????????÷????

SPI_I2S_SendData(SPI2, TxData);

while(SPI_I2S_GetFlagStatus( SPI2, SPI_I2S_FLAG_RXNE) == RESET);

return SPI_I2S_ReceiveData(SPI2);

}

uint16_t SPI_Flash_ReadID(void)

{

uint16_t Temp;

SPI_FLASH_CS = 0;

SPI2_ReadWriteByte(0x90);

SPI2_ReadWriteByte(0x00);

Temp |= SPI2_ReadWriteByte(0xFF)<<8;

Temp |= SPI2_ReadWriteByte(0xFF);

SPI_FLASH_CS = 1;

return Temp;

}

int main(void)
{
LED_Init();

LCD_Init();

SPI2_Init();
if(SPI_Flash_ReadID() == 0XEF16)

{

LCD_ShowString(60,150,200,16,16,"24C02 Check Failed!");

LED0=0;

}

while(1);
}

这个FLASH的ID怎么都读取不到，到底哪里有毛病或者少了哪一步？知道的大神给指点指点啊晕了都快T_T

八度空间 · 发表于 2013-11-16 08:11:01

回复【楼主位】xc1989:
---------------------------------
楼主的SPI FLASH是什么幸好的，要知道他的ID才行，你的主函数那里应该错了吧， if(SPI_Flash_ReadID() == 0XEF16)改为 if(SPI_Flash_ReadID() ！= 0XEF16)

xc1989 · 发表于 2013-11-16 15:44:36

回复【2楼】Badu_Space:
---------------------------------
这个芯片的ID就是战舰上的W25Q64 ID没有错，我就是想验证下读到是否正确，如果正确就在LCD上显示字符，我拿原子的程序考上去没有问题，可是自己编的就不行，程序走不到WHILE（1）循环，看原子的程序和自己的程序都对照着看了好几遍了，还是没找到问题所在

八度空间 · 发表于 2013-11-17 10:40:45

回复【3楼】xc1989:
---------------------------------
看你的代码，你的LCD应该显示“24C02 Check Failed!”了，程序已经进入while(1)循环了

fgq369 · 发表于 2013-11-18 11:12:27

回复【楼主位】xc1989:

#include "SpiFlash.h"
#include "stm32f10x_spi.h"
void SPI2_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
SPI_InitTypeDef  SPI_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);   //?ò???±??
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2,ENABLE);

GPIO_InitStructure.GPIO_Pin   = GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15;  // 13 14 15 ??SPI?????è??????
GPIO_InitStruc
......
---------------------------------
你主函数里的SPI初始化有问题，SPI2_Init();应该为SPI_Flash_Init();   //SPI FLASH 初始化