spi flash为M25P64时，给出详细代码

好的，以下是一个基于STM32的SPI Flash擦除函数示例，假设使用的是M25P64 SPI Flash。这里使用的是HAL库，你需要在你的项目中添加HAL库的支持。

#include "main.h"
#include "spi.h"

#define SPI_FLASH_CS_LOW()      HAL_GPIO_WritePin(SPI_FLASH_CS_GPIO_Port, SPI_FLASH_CS_Pin, GPIO_PIN_RESET)
#define SPI_FLASH_CS_HIGH()     HAL_GPIO_WritePin(SPI_FLASH_CS_GPIO_Port, SPI_FLASH_CS_Pin, GPIO_PIN_SET)

#define CMD_WRITE_ENABLE        0x06
#define CMD_WRITE_DISABLE       0x04
#define CMD_READ_STATUS         0x05
#define CMD_WRITE_STATUS        0x01
#define CMD_FAST_READ           0x0B
#define CMD_PAGE_PROGRAM        0x02
#define CMD_SECTOR_ERASE        0x20
#define CMD_BLOCK_ERASE         0xD8
#define CMD_CHIP_ERASE          0xC7

#define STATUS_BUSY             0x01
#define STATUS_WEL              0x02

void SPI_Flash_WriteEnable(void)
{
    SPI_FLASH_CS_LOW();
    HAL_SPI_Transmit(&hspi1, &CMD_WRITE_ENABLE, 1, HAL_MAX_DELAY);
    SPI_FLASH_CS_HIGH();
}

void SPI_Flash_WriteDisable(void)
{
    SPI_FLASH_CS_LOW();
    HAL_SPI_Transmit(&hspi1, &CMD_WRITE_DISABLE, 1, HAL_MAX_DELAY);
    SPI_FLASH_CS_HIGH();
}

uint8_t SPI_Flash_ReadStatus(void)
{
    uint8_t status;
    SPI_FLASH_CS_LOW();
    HAL_SPI_Transmit(&hspi1, &CMD_READ_STATUS, 1, HAL_MAX_DELAY);
    HAL_SPI_Receive(&hspi1, &status, 1, HAL_MAX_DELAY);
    SPI_FLASH_CS_HIGH();
    return status;
}

void SPI_Flash_WriteStatus(uint8_t status)
{
    SPI_Flash_WriteEnable();
    SPI_FLASH_CS_LOW();
    HAL_SPI_Transmit(&hspi1, &CMD_WRITE_STATUS, 1, HAL_MAX_DELAY);
    HAL_SPI_Transmit(&hspi1, &status, 1, HAL_MAX_DELAY);
    SPI_FLASH_CS_HIGH();
    while(SPI_Flash_ReadStatus() & STATUS_BUSY);
}

void SPI_Flash_FastRead(uint32_t address, uint8_t *data, uint32_t size)
{
    uint8_t cmd[] = {CMD_FAST_READ, (uint8_t)(address >> 16), (uint8_t)(address >> 8), (uint8_t)address, 0x00};
    SPI_FLASH_CS_LOW();
    HAL_SPI_Transmit(&hspi1, cmd, sizeof(cmd), HAL_MAX_DELAY);
    HAL_SPI_Receive(&hspi1, data, size, HAL_MAX_DELAY);
    SPI_FLASH_CS_HIGH();
}

void SPI_Flash_PageProgram(uint32_t address, uint8_t *data, uint32_t size)
{
    SPI_Flash_WriteEnable();
    SPI_FLASH_CS_LOW();
    uint8_t cmd[] = {CMD_PAGE_PROGRAM, (uint8_t)(address >> 16), (uint8_t)(address >> 8), (uint8_t)address};
    HAL_SPI_Transmit(&hspi1, cmd, sizeof(cmd), HAL_MAX_DELAY);
    HAL_SPI_Transmit(&hspi1, data, size, HAL_MAX_DELAY);
    SPI_FLASH_CS_HIGH();
    while(SPI_Flash_ReadStatus() & STATUS_BUSY);
}

void SPI_Flash_SectorErase(uint32_t address)
{
    SPI_Flash_WriteEnable();
    SPI_FLASH_CS_LOW();
    uint8_t cmd[] = {CMD_SECTOR_ERASE, (uint8_t)(address >> 16), (uint8_t)(address >> 8), (uint8_t)address};
    HAL_SPI_Transmit(&hspi1, cmd, sizeof(cmd), HAL_MAX_DELAY);
    SPI_FLASH_CS_HIGH();
    while(SPI_Flash_ReadStatus() & STATUS_BUSY);
}

void SPI_Flash_BlockErase(uint32_t address)
{
    SPI_Flash_WriteEnable();
    SPI_FLASH_CS_LOW();
    uint8_t cmd[] = {CMD_BLOCK_ERASE, (uint8_t)(address >> 16), (uint8_t)(address >> 8), (uint8_t)address};
    HAL_SPI_Transmit(&hspi1, cmd, sizeof(cmd), HAL_MAX_DELAY);
    SPI_FLASH_CS_HIGH();
    while(SPI_Flash_ReadStatus() & STATUS_BUSY);
}

void SPI_Flash_ChipErase(void)
{
    SPI_Flash_WriteEnable();
    SPI_FLASH_CS_LOW();
    uint8_t cmd[] = {CMD_CHIP_ERASE};
    HAL_SPI_Transmit(&hspi1, cmd, sizeof(cmd), HAL_MAX_DELAY);
    SPI_FLASH_CS_HIGH();
    while(SPI_Flash_ReadStatus() & STATUS_BUSY);
}

void SPI_Flash_EraseAll(void)
{
    SPI_Flash_ChipErase();
}

void SPI_Flash_Init(void)
{
    SPI_Flash_WriteStatus(0x00);
}

void SPI_Flash_EraseOnStartup(void)
{
    SPI_Flash_EraseAll();
}

int main(void)
{
    HAL_Init();
    MX_SPI1_Init();

    SPI_Flash_Init();
    SPI_Flash_EraseOnStartup();

    while(1)
    {
        // Your code here
    }
}

在上述代码中，`SPI_Flash_EraseOnStartup()`函数会在每次设备上电时调用，以擦除SPI Flash存储器中的所有内容。请注意，这里使用的是芯片擦除命令（`CMD_CHIP_ERASE`），这会将整个芯片擦除。如果你想使用其他擦除方式，可以使用`SPI_Flash_SectorErase()`或`SPI_Flash_BlockErase()`函数。

当然，你需要根据你的具体硬件和软件实现来修改和适配以上代码。