我使用从官网下载的例程包中的\EXAM\SPI\SPI_FLASH文件夹内的程序来测试读取w25Q32JVSIQ中的数据（已经预先通过烧录器烧写进数据了）发现读取到的数据与实际数据不符，但是读取flash的ID又是正确的。
例如，我读取地址0xDA0，得到的数据是：00 00 00 00 18 00 00 00 00 18 00 00 00 00 0C 00 但实际上0xDA0地址的数据如下图。麻烦大家帮忙看看是什么原因?
程序如下（删掉了部分原代码）：
*@Note
SPI接口操作FLASH外设例程：
Master：SPI1_SCK(PA5)、SPI1_MISO(PA6)、SPI1_MOSI(PA7)。
本例程演示 SPI 操作 Winbond W25Qxx SPIFLASH。
注：
pins:
CS —— PA2
DO —— PA6(SPI1_MISO)
WP —— 3.3V
DI —— PA7(SPI1_MOSI)
CLK —— PA5(SPI1_SCK)
HOLD —— 3.3V
*/
#include "debug.h"
#include "string.h"
/* Winbond SPIFalsh ID */
#define W25Q80 0XEF13
#define W25Q16 0XEF14
#define W25Q32 0XEF15
#define W25Q64 0XEF16
#define W25Q128 0XEF17
/* Winbond SPIFalsh Instruction List */
#define W25X_WriteEnable 0x06 //Write Enable
#define W25X_WriteDisable 0x04 //Write Disable
#define W25X_ReadStatusReg 0x05 //Read Status Register-1
#define W25X_WriteStatusReg 0x01 //Write Status Register-1
#define W25X_ReadData 0x03 //Read Data
#define W25X_FastReadData 0x0B //Fast Read
#define W25X_FastReadDual 0x3B //Fast Read Dual Output
#define W25X_PageProgram 0x02 //Page Program
#define W25X_BlockErase 0xD8 //Block Erase (64KB)
#define W25X_SectorErase 0x20 //Sector Erase (4KB)
#define W25X_ChipErase 0xC7 //Chip Erase
#define W25X_PowerDown 0xB9 //Power-down
#define W25X_ReleasePowerDown 0xAB //Release Power-down / ID
#define W25X_DeviceID 0xAB
#define W25X_ManufactDeviceID 0x90 //Manufacturer/Device ID
#define W25X_JedecDeviceID 0x9F //JEDEC ID
/* Global define */
/* Global Variable */
u8 SPI_FLASH_BUF[4096];
const u8 TEXT_Buf[] = {"CH32F103 SPI FLASH W25Qxx"};
#define SIZE sizeof(TEXT_Buf)
/*********************************************************************
* @fn SPI1_ReadWriteByte
*
* @brief SPI1 read or write one byte.
*
* @param TxData - write one byte data.
*
* @return Read one byte data.
*/
u8 SPI1_ReadWriteByte(u8 TxData)
{
u8 i = 0;
while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET)//检测TXE是否置位，是，则表示 DR为空，可以写入数据
{
i++;
if(i > 200)
return 0;
}
SPI_I2S_SendData(SPI1, TxData);
i = 0;
while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET)//检测RXE是否置位，是，则表示 DR接收到数据，即发送完成
{
i++;
if(i > 200)
return 0;
}
return SPI_I2S_ReceiveData(SPI1);
}
/*********************************************************************
* @fn SPI_Flash_Init
*
* @brief Configuring the SPI for operation flash.
*
* @return none
*/
void SPI_Flash_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure = {0};
SPI_InitTypeDef SPI_InitStructure = {0};
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_SPI1, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_SetBits(GPIOA, GPIO_Pin_2);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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_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_4;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStructure);
SPI_Cmd(SPI1, ENABLE);
}
/*********************************************************************
* @fn SPI_Flash_ReadSR
*
* @brief Read W25Qxx status register.
* ——BIT7 6 5 4 3 2 1 0
* ——SPR RV TB BP2 BP1 BP0 WEL BUSY
*
* @return byte - status register value.
*/
u8 SPI_Flash_ReadSR(void)
{
u8 byte = 0;
GPIO_WriteBit(GPIOA, GPIO_Pin_2, 0);
SPI1_ReadWriteByte(W25X_ReadStatusReg);
byte = SPI1_ReadWriteByte(0Xff);
GPIO_WriteBit(GPIOA, GPIO_Pin_2, 1);
return byte;
}
/*********************************************************************
* @fn SPI_Flash_ReadID
*
* @brief Read flash ID.
*
* @return Temp - FLASH ID.
*/
u16 SPI_Flash_ReadID(void)
{
u16 Temp = 0;
GPIO_WriteBit(GPIOA, GPIO_Pin_2, 0);//cs
SPI1_ReadWriteByte(W25X_ManufactDeviceID);
SPI1_ReadWriteByte(0x00);
SPI1_ReadWriteByte(0x00);
SPI1_ReadWriteByte(0x00);
Temp |= SPI1_ReadWriteByte(0xFF) << 8;
Temp |= SPI1_ReadWriteByte(0xFF);
printf("IDtemp=%x\n\r",Temp);
GPIO_WriteBit(GPIOA, GPIO_Pin_2, 1);
return Temp;
}
/*********************************************************************
* @fn SPI_Flash_Read
*
* @brief Read data from flash.
*
* @param pBuffer -
* ReadAddr -Initial address(24bit).
* size - Data length.
*
* @return none
*/
void SPI_Flash_Read(u8 *pBuffer, u32 ReadAddr, u16 size)
{
u16 i;
GPIO_WriteBit(GPIOA, GPIO_Pin_2, 0);
SPI1_ReadWriteByte(W25X_ReadData);
SPI1_ReadWriteByte((u8)((ReadAddr) >> 16));//发送24位地址
SPI1_ReadWriteByte((u8)((ReadAddr) >> 8));
SPI1_ReadWriteByte((u8)ReadAddr);
printf("read=>0x%.6X\n\r",ReadAddr);
for(i = 0; i < size; i++){
pBuffer[i] = SPI1_ReadWriteByte(0XFF);
// printf("p-%.2x ",pBuffer[i]);
}
GPIO_WriteBit(GPIOA, GPIO_Pin_2, 1);
}
int main(void)
{
//u8 datap[SIZE];
u8 datap[16];
u16 Flash_Model;
u8 x;
Delay_Init();
USART_Printf_Init(115200);
printf("SystemClk:%d\r\n", SystemCoreClock);
SPI_Flash_Init();
Flash_Model = SPI_Flash_ReadID();
printf("Flash_Model->\r\n",Flash_Model);
SPI_Flash_Read(datap, 0xDA0, 16);//从地址0xDA0读取16个字节
for(x=0; x<16; x++)
{
printf("%.2X ",datap[x]);
}
printf("\r\n");
while(1);
}
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