stm32 读写fm25cl64代码

以下是基于STM32的SPI接口读写FM25CL64的示例代码：

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

#define FM25CL64_CS_LOW()   GPIO_ResetBits(GPIOE, GPIO_Pin_3)
#define FM25CL64_CS_HIGH()  GPIO_SetBits(GPIOE, GPIO_Pin_3)

#define FM25CL64_WREN       0x06    /* write enable */
#define FM25CL64_WRDI       0x04    /* write disable */
#define FM25CL64_RDSR       0x05    /* read status register */
#define FM25CL64_WRSR       0x01    /* write status register */
#define FM25CL64_READ       0x03    /* read data bytes */
#define FM25CL64_WRITE      0x02    /* write data bytes */

void fm25cl64_init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    /* enable the peripheral clock for GPIOE */
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOE, ENABLE);

    /* configure GPIOE pin 3 as output push-pull */
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
    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(GPIOE, &GPIO_InitStructure);

    /* deselect the chip */
    FM25CL64_CS_HIGH();
}

void fm25cl64_write_enable(void)
{
    uint8_t cmd = FM25CL64_WREN;

    /* select the chip */
    FM25CL64_CS_LOW();

    /* send the write enable command */
    spi_write(&cmd, 1);

    /* deselect the chip */
    FM25CL64_CS_HIGH();
}

void fm25cl64_write_disable(void)
{
    uint8_t cmd = FM25CL64_WRDI;

    /* select the chip */
    FM25CL64_CS_LOW();

    /* send the write disable command */
    spi_write(&cmd, 1);

    /* deselect the chip */
    FM25CL64_CS_HIGH();
}

uint8_t fm25cl64_read_status(void)
{
    uint8_t cmd[2] = {FM25CL64_RDSR, 0xFF};
    uint8_t status;

    /* select the chip */
    FM25CL64_CS_LOW();

    /* send the read status command */
    spi_write_read(cmd, 2, &status, 1);

    /* deselect the chip */
    FM25CL64_CS_HIGH();

    return status;
}

void fm25cl64_write_status(uint8_t status)
{
    uint8_t cmd[2] = {FM25CL64_WRSR, status};

    /* select the chip */
    FM25CL64_CS_LOW();

    /* send the write status command */
    spi_write(cmd, 2);

    /* deselect the chip */
    FM25CL64_CS_HIGH();
}

void fm25cl64_read(uint16_t addr, uint8_t *data, uint16_t len)
{
    uint8_t cmd[3] = {FM25CL64_READ, (uint8_t)(addr >> 8), (uint8_t)(addr & 0xFF)};

    /* select the chip */
    FM25CL64_CS_LOW();

    /* send the read command and address */
    spi_write(cmd, 3);

    /* read the data */
    spi_read(data, len);

    /* deselect the chip */
    FM25CL64_CS_HIGH();
}

void fm25cl64_write(uint16_t addr, const uint8_t *data, uint16_t len)
{
    uint8_t cmd[3] = {FM25CL64_WRITE, (uint8_t)(addr >> 8), (uint8_t)(addr & 0xFF)};

    /* select the chip */
    FM25CL64_CS_LOW();

    /* send the write enable command */
    fm25cl64_write_enable();

    /* send the write command and address */
    spi_write(cmd, 3);

    /* write the data */
    spi_write(data, len);

    /* deselect the chip */
    FM25CL64_CS_HIGH();

    /* send the write disable command */
    fm25cl64_write_disable();
}

在上面的代码中，我们使用了SPI接口来和FM25CL64进行通信，需要先在STM32中初始化SPI接口。在初始化FM25CL64之后，我们可以使用`fm25cl64_read`和`fm25cl64_write`函数来读取和写入数据，其中需要指定要读写的地址和数据的长度。在读写数据之前，需要先通过`fm25cl64_write_enable`和`fm25cl64_write_disable`函数来启用和禁用写操作。在读取数据时，需要先发送读命令和地址，然后读取数据；在写入数据时，需要先发送写命令和地址，然后写入数据。需要注意的是，在写入数据之前需要先启用写操作，在写入数据之后需要禁用写操作。