AT25DF081A 典型电路

AT25DF081A是一种8Mbit的串行闪存存储器，常用于嵌入式系统中。下面是AT25DF081A的典型电路图：


该电路中，AT25DF081A与主控芯片通过SPI接口进行通信，主控芯片可以读写AT25DF081A中存储的数据。VCC和GND分别为芯片的供电端口。CS（Chip Select）为片选信号，通过该信号来选中AT25DF081A，使其与主控芯片进行通信。SO（Serial Output）和SI（Serial Input）分别为串行输出和输入信号线，用于AT25DF081A与主控芯片之间的数据传输。SCK（Serial Clock）为串行时钟信号线，用于同步数据传输的时序。WP（Write Protect）为写保护信号线，当该信号为高电平时，AT25DF081A不能进行写操作。HOLD为暂停信号线，当该信号为高电平时，AT25DF081A将暂停当前的操作。

相关问题

AT25DF081A 和AT26DF081A区别

AT25DF081A和AT26DF081A是两种不同的闪存存储器芯片，它们的主要区别在于存储密度和供电电压。

首先，AT25DF081A是一种8Mbit的闪存存储器，而AT26DF081A是一种16Mbit的闪存存储器，存储密度比AT25DF081A高一倍。

其次，AT25DF081A的供电电压范围是2.7V至3.6V，而AT26DF081A的供电电压范围是1.65V至1.95V，因此AT26DF081A的功耗更低，适合于低功耗应用场景。

除此之外，它们的主要功能和特性都比较相似，都采用了SPI接口进行通信，支持多种读写模式，并且都具有写保护和暂停功能等。

总之，AT25DF081A和AT26DF081A虽然有一些区别，但是它们都是闪存存储器芯片，可以根据不同的应用场景选择适合的芯片。

at25df081a HAL库驱动代码

以下是AT25DF081A的HAL库驱动代码，供您参考：

#include "stm32f10x.h"
#include "spi.h"
#include "at25df081a.h"

#define AT25DF081A_PAGESIZE        256
#define AT25DF081A_PAGESIZE_MASK   0xFF

#define AT25DF081A_SECTORSIZE      4096
#define AT25DF081A_SECTORSIZE_MASK 0xFFF

#define AT25DF081A_MAXADDRESS      0x7FFFFF

static uint8_t at25df081a_tx_buf[AT25DF081A_PAGESIZE+4];
static uint8_t at25df081a_rx_buf[AT25DF081A_PAGESIZE+4];

void AT25DF081A_Init(void)
{
    SPI2_Init();
}

void AT25DF081A_WriteEnable(void)
{
    uint8_t cmd = AT25DF081A_CMD_WRITE_ENABLE;

    SPI2_CS_LOW();
    SPI2_SendData(&cmd, 1);
    SPI2_CS_HIGH();
}

void AT25DF081A_WriteDisable(void)
{
    uint8_t cmd = AT25DF081A_CMD_WRITE_DISABLE;

    SPI2_CS_LOW();
    SPI2_SendData(&cmd, 1);
    SPI2_CS_HIGH();
}

uint8_t AT25DF081A_ReadStatusRegister(void)
{
    uint8_t cmd = AT25DF081A_CMD_READ_STATUS_REGISTER;
    uint8_t data;

    SPI2_CS_LOW();
    SPI2_SendData(&cmd, 1);
    SPI2_ReceiveData(&data, 1);
    SPI2_CS_HIGH();

    return data;
}

void AT25DF081A_WriteStatusRegister(uint8_t value)
{
    uint8_t cmd[2];

    cmd[0] = AT25DF081A_CMD_WRITE_STATUS_REGISTER;
    cmd[1] = value;

    SPI2_CS_LOW();
    SPI2_SendData(cmd, 2);
    SPI2_CS_HIGH();
}

void AT25DF081A_EraseChip(void)
{
    uint8_t cmd = AT25DF081A_CMD_ERASE_CHIP;

    AT25DF081A_WriteEnable();

    SPI2_CS_LOW();
    SPI2_SendData(&cmd, 1);
    SPI2_CS_HIGH();

    while (AT25DF081A_ReadStatusRegister() & AT25DF081A_STATUS_REGISTER_BUSY_FLAG);

    AT25DF081A_WriteDisable();
}

void AT25DF081A_EraseSector(uint32_t address)
{
    uint8_t cmd[4];

    cmd[0] = AT25DF081A_CMD_ERASE_SECTOR;
    cmd[1] = (address >> 16) & 0xFF;
    cmd[2] = (address >> 8) & 0xFF;
    cmd[3] = address & 0xFF;

    AT25DF081A_WriteEnable();

    SPI2_CS_LOW();
    SPI2_SendData(cmd, 4);
    SPI2_CS_HIGH();

    while (AT25DF081A_ReadStatusRegister() & AT25DF081A_STATUS_REGISTER_BUSY_FLAG);

    AT25DF081A_WriteDisable();
}

void AT25DF081A_EraseBlock(uint32_t address)
{
    uint8_t cmd[4];

    cmd[0] = AT25DF081A_CMD_ERASE_BLOCK;
    cmd[1] = (address >> 16) & 0xFF;
    cmd[2] = (address >> 8) & 0xFF;
    cmd[3] = address & 0xFF;

    AT25DF081A_WriteEnable();

    SPI2_CS_LOW();
    SPI2_SendData(cmd, 4);
    SPI2_CS_HIGH();

    while (AT25DF081A_ReadStatusRegister() & AT25DF081A_STATUS_REGISTER_BUSY_FLAG);

    AT25DF081A_WriteDisable();
}

void AT25DF081A_WritePage(uint32_t address, uint8_t *data, uint16_t length)
{
    uint8_t cmd[4];
    uint16_t i;

    cmd[0] = AT25DF081A_CMD_PAGE_PROGRAM;
    cmd[1] = (address >> 16) & 0xFF;
    cmd[2] = (address >> 8) & 0xFF;
    cmd[3] = address & 0xFF;

    AT25DF081A_WriteEnable();

    if (length > AT25DF081A_PAGESIZE)
    {
        length = AT25DF081A_PAGESIZE;
    }

    at25df081a_tx_buf[0] = cmd[0];
    at25df081a_tx_buf[1] = cmd[1];
    at25df081a_tx_buf[2] = cmd[2];
    at25df081a_tx_buf[3] = cmd[3];
    for (i = 0; i < length; i++)
    {
        at25df081a_tx_buf[i+4] = data[i];
    }

    SPI2_CS_LOW();
    SPI2_SendData(at25df081a_tx_buf, length+4);
    SPI2_CS_HIGH();

    while (AT25DF081A_ReadStatusRegister() & AT25DF081A_STATUS_REGISTER_BUSY_FLAG);

    AT25DF081A_WriteDisable();
}

void AT25DF081A_ReadPage(uint32_t address, uint8_t *data, uint16_t length)
{
    uint8_t cmd[4];
    uint16_t i;

    cmd[0] = AT25DF081A_CMD_READ_DATA;
    cmd[1] = (address >> 16) & 0xFF;
    cmd[2] = (address >> 8) & 0xFF;
    cmd[3] = address & 0xFF;

    if (length > AT25DF081A_PAGESIZE)
    {
        length = AT25DF081A_PAGESIZE;
    }

    at25df081a_tx_buf[0] = cmd[0];
    at25df081a_tx_buf[1] = cmd[1];
    at25df081a_tx_buf[2] = cmd[2];
    at25df081a_tx_buf[3] = cmd[3];

    SPI2_CS_LOW();
    SPI2_SendData(at25df081a_tx_buf, 4);
    SPI2_ReceiveData(at25df081a_rx_buf, length+4);
    SPI2_CS_HIGH();

    for (i = 0; i < length; i++)
    {
        data[i] = at25df081a_rx_buf[i+4];
    }
}

void AT25DF081A_Write(uint32_t address, uint8_t *data, uint16_t length)
{
    uint16_t offset;

    while (length > 0)
    {
        offset = address & AT25DF081A_PAGESIZE_MASK;
        if (offset + length > AT25DF081A_PAGESIZE)
        {
            length = AT25DF081A_PAGESIZE - offset;
        }

        AT25DF081A_WritePage(address, data, length);

        address += length;
        data += length;
        length -= length;
    }
}

void AT25DF081A_Read(uint32_t address, uint8_t *data, uint16_t length)
{
    uint16_t offset;

    while (length > 0)
    {
        offset = address & AT25DF081A_PAGESIZE_MASK;
        if (offset + length > AT25DF081A_PAGESIZE)
        {
            length = AT25DF081A_PAGESIZE - offset;
        }

        AT25DF081A_ReadPage(address, data, length);

        address += length;
        data += length;
        length -= length;
    }
}

注意，以上代码是基于STM32 HAL库编写的，如果您使用的是其他平台或库，需要相应地进行修改。另外，代码中还使用了SPI驱动，需要您先编写好SPI驱动，并在代码中调用相应的函数。