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;
}