怎么让我再次读取w25q128ID为正常值

要再次读取W25Q128的正常ID值，你需要向芯片发送一个读取ID的命令。W25Q128的读取ID命令是0x90，它需要一个3字节的地址作为参数。你可以使用SPI接口向芯片发送这个命令，并读取返回值。以下是一个示例代码片段，可以帮助你实现这个功能：

// 发送读取ID命令
SPI_Transmit(0x90);
SPI_Transmit(0x00);
SPI_Transmit(0x00);
// 读取ID返回值
uint8_t manufacturer = SPI_Receive();
uint8_t device_type = SPI_Receive();
uint8_t device_id = SPI_Receive();

在这个例子中，SPI_Transmit()函数用于向芯片发送一个字节的命令或数据，SPI_Receive()函数用于从芯片接收一个字节的返回值。通过这种方式，你可以重新读取W25Q128的ID，并获得正确的返回值。

相关问题

stm32读取w25Q128的ID

以下是基于STM32的SPI接口读取W25Q128的ID的示例代码：

#include "stm32f4xx.h"
#include "spi.h"

#define W25Q128_ID 0xEF4018

uint32_t w25q128_read_id(void)
{
    uint8_t tx_data[4] = {0x9F, 0x00, 0x00, 0x00}; // 发送读取ID命令
    uint8_t rx_data[4] = {0};
    uint32_t id = 0;

    SPI_CS_LOW(); // 使能SPI片选信号

    // 发送读取ID命令并接收返回数据
    for (int i = 0; i < 4; i++)
    {
        rx_data[i] = spi_transfer(tx_data[i]);
    }

    SPI_CS_HIGH(); // 禁用SPI片选信号

    // 将接收到的数据转换为32位ID值
    id = ((uint32_t)rx_data[1] << 16) | ((uint32_t)rx_data[2] << 8) | (uint32_t)rx_data[3];

    return id;
}

int main(void)
{
    uint32_t id = 0;

    spi_init(); // 初始化SPI接口

    id = w25q128_read_id(); // 读取W25Q128的ID

    if (id == W25Q128_ID)
    {
        // ID匹配成功
    }
    else
    {
        // ID匹配失败
    }

    while (1)
    {
        // 程序循环主体
    }
}

需要注意的是，这里的`spi_transfer()`函数是自定义的SPI数据传输函数，需要根据具体的硬件配置进行修改。同时，在读取W25Q128的ID之前需要先初始化SPI接口。

stm32读取w25Q128的8字节ID

以下是一个示例代码，使用SPI接口读取W25Q128的8字节ID：

#include "stm32f4xx.h"
#include "stm32f4xx_spi.h"
#include "stm32f4xx_gpio.h"

#define SPIx                    SPI1
#define SPIx_CLK                RCC_APB2Periph_SPI1

#define SPIx_CS_PIN             GPIO_Pin_4
#define SPIx_CS_GPIO_PORT       GPIOA
#define SPIx_CS_GPIO_CLK        RCC_AHB1Periph_GPIOA

#define SPIx_MOSI_PIN           GPIO_Pin_7
#define SPIx_MOSI_GPIO_PORT     GPIOA
#define SPIx_MOSI_GPIO_CLK      RCC_AHB1Periph_GPIOA
#define SPIx_MOSI_SOURCE        GPIO_PinSource7
#define SPIx_MOSI_AF            GPIO_AF_SPI1

#define SPIx_MISO_PIN           GPIO_Pin_6
#define SPIx_MISO_GPIO_PORT     GPIOA
#define SPIx_MISO_GPIO_CLK      RCC_AHB1Periph_GPIOA
#define SPIx_MISO_SOURCE        GPIO_PinSource6
#define SPIx_MISO_AF            GPIO_AF_SPI1

#define SPIx_SCK_PIN            GPIO_Pin_5
#define SPIx_SCK_GPIO_PORT      GPIOA
#define SPIx_SCK_GPIO_CLK       RCC_AHB1Periph_GPIOA
#define SPIx_SCK_SOURCE         GPIO_PinSource5
#define SPIx_SCK_AF             GPIO_AF_SPI1

void SPIx_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    SPI_InitTypeDef  SPI_InitStructure;

    /* SPIx_CS_GPIO, SPIx_MOSI_GPIO, SPIx_MISO_GPIO and SPIx_SCK_GPIO Periph clock enable */
    RCC_AHB1PeriphClockCmd(SPIx_CS_GPIO_CLK | SPIx_MOSI_GPIO_CLK | SPIx_MISO_GPIO_CLK | SPIx_SCK_GPIO_CLK, ENABLE);

    /* SPIx Periph clock enable */
    RCC_APB2PeriphClockCmd(SPIx_CLK, ENABLE);

    /* Configure SPIx_CS_PIN in output pushpull mode */
    GPIO_InitStructure.GPIO_Pin = SPIx_CS_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_Init(SPIx_CS_GPIO_PORT, &GPIO_InitStructure);

    /* Configure SPIx pins: SCK, MISO and MOSI */
    GPIO_InitStructure.GPIO_Pin = SPIx_SCK_PIN | SPIx_MISO_PIN | SPIx_MOSI_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_NOPULL;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    /* Connect SPIx pins to AF */
    GPIO_PinAFConfig(SPIx_SCK_GPIO_PORT, SPIx_SCK_SOURCE, SPIx_SCK_AF);
    GPIO_PinAFConfig(SPIx_MISO_GPIO_PORT, SPIx_MISO_SOURCE, SPIx_MISO_AF);
    GPIO_PinAFConfig(SPIx_MOSI_GPIO_PORT, SPIx_MOSI_SOURCE, SPIx_MOSI_AF);

    /* SPIx configuration ------------------------------------------------------*/
    SPI_I2S_DeInit(SPIx);
    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_1Edge;
    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(SPIx, &SPI_InitStructure);

    /* Enable SPIx */
    SPI_Cmd(SPIx, ENABLE);
}

uint8_t SPIx_ReadWriteByte(uint8_t data)
{
    /* Wait until the transmit buffer is empty */
    while (SPI_I2S_GetFlagStatus(SPIx, SPI_I2S_FLAG_TXE) == RESET);

    /* Send the byte */
    SPI_I2S_SendData(SPIx, data);

    /* Wait until a data is received */
    while (SPI_I2S_GetFlagStatus(SPIx, SPI_I2S_FLAG_RXNE) == RESET);

    /* Get the received data */
    return SPI_I2S_ReceiveData(SPIx);
}

uint32_t W25Q128_ReadID(void)
{
    uint32_t id = 0;
    SPIx_CS_GPIO_PORT->BSRRH = SPIx_CS_PIN; // set CS low

    SPIx_ReadWriteByte(0x90); // send read ID command
    SPIx_ReadWriteByte(0x00); // send address byte 1
    SPIx_ReadWriteByte(0x00); // send address byte 2
    SPIx_ReadWriteByte(0x00); // send address byte 3
    id |= SPIx_ReadWriteByte(0xFF) << 16;
    id |= SPIx_ReadWriteByte(0xFF) << 8;
    id |= SPIx_ReadWriteByte(0xFF);

    SPIx_CS_GPIO_PORT->BSRRL = SPIx_CS_PIN; // set CS high
    return id;
}

int main(void)
{
    SPIx_Init();
    uint32_t id = W25Q128_ReadID();
    return 0;
}