spiFLASH芯片W25Q80的单片机驱动代码

#include "w25q80.h"


// 注：W25Q80由256 BYTE 组成一个 PAGE，不可PGAE擦除，可以进行BYTE PROGRAM 或者 PAGE PROGRAM
// 由16 PAGE 组成一个 SECTOR， 可 SECTOR擦除
// 由16 SECTOR组成一个 BLOCK， 可 BLOCK 擦除
// 由16 BLOCK 组成一个 FULL MEMEORY，可 FULL MEMORY 擦除
// 所以，总容量是1M bytes


// W25Q80主要命令字
#define READ_ARRAY 0x03
#define SECTOR_ERASE 0x20
#define BYTE_OR_PAGE_PROGRAM 0x02
#define WRITE_ENABLE 0x06
#define WRITE_DISABLE 0x04
#define READ_STATUS_REGISTER 0x05
#define Manufacturer_DeviceID 0x9F


// 定义W25Q80的CS脚对应MCU的IO
#define W25Q80_CS P1_2


// SPI硬件初始化
void Spi_Init(void)
{
PERCFG |= 0x02; // SPI1映射到P1口
P1SEL |= 0xE0; // P15~P17作复用功能(clk mosi miso)
P1SEL &= ~0x04; // P12作GPIO
P1DIR |= 0x04; // P12作输出
P1_2 = 1; // P12输出高电平

U1CSR &= ~0xA0; // SPI主方式
U1GCR &= ~0xC0; // CPOL=0 CPHA=0
U1GCR |= 0x20; // MSB
U1BAUD = 0; // 波特率设为sysclk/8
U1GCR |= 0x11;
}


// SPI发送与接收字节
static u8 Spi_ReadWriteByte(u8 TxData)
{
U1DBUF = TxData; // 发送数据
while( !(U1CSR&0x02) ); // 等待发送完成
U1CSR &= 0xFD; // 清除发送完成标志

return U1DBUF;
}


// CS线拉低，使能芯片
static void W25Q80_Enable( void )
{
volatile u8 i;

W25Q80_CS = 0;
for ( i=5; i>0; i-- ); // 延时
}


// CS线拉高，禁能芯片
#define W25Q80_Disable() ( W25Q80_CS = 1 )


// 设置FLASH芯片"写使能"
static void SetW25Q80WriteEnable(void)
{
W25Q80_Enable();
Spi_ReadWriteByte(WRITE_ENABLE);
W25Q80_Disable();
}


// 设置FLASH芯片"写禁能"
//static void ClearW25Q80WriteEnable(void)
//{
// W25Q80_Enable();
// Spi_ReadWriteByte(WRITE_DISABLE);
// W25Q80_Disable();
//}


// 读取FLASH芯片的状态字节，可判断芯片是否busy
static u8 ReadW25Q80StatusRegister(void)
{
u8 temp;

W25Q80_Enable();

Spi_ReadWriteByte(READ_STATUS_REGISTER);
temp = Spi_ReadWriteByte(0xF0);

W25Q80_Disable();

return temp;
}


// 读取FLASH的内容，读取的字节数没有限制
void ReadW25Q80Operation(u32 addr,u8 *databuf,u32 len)
{
u32 i = 0;
u8 temp;

temp = ReadW25Q80StatusRegister();
while( temp&0x01 ) // 等待FLASH芯片结束BUSY状态
{
temp = ReadW25Q80StatusRegister();
if ( ++i>1000000 ) return;
}


W25Q80_Enable();

Spi_ReadWriteByte(READ_ARRAY);
Spi_ReadWriteByte((u8)(addr >>16));
Spi_ReadWriteByte((u8)(addr >>8));
Spi_ReadWriteByte((u8)addr);
for ( i=0; i{

databuf[i] = Spi_ReadWriteByte(0xF0);
}

W25Q80_Disable();
}


// 写入FLASH，一次最多写256字节，注意不要越界（不要超过页边界）
void WriteW25Q80Operation(u32 addr,u8 *databuf,u16 len)
{
u32 i = 0;
u8 temp;

temp = ReadW25Q80StatusRegister();
while( temp&0x01 ) // 等待FLASH芯片结束BUSY状态
{
temp = ReadW25Q80StatusRegister();
if ( ++i>1000000 ) return;
}

SetW25Q80WriteEnable(); // 设置芯片写使能

W25Q80_Enable();

Spi_ReadWriteByte(BYTE_OR_PAGE_PROGRAM);
Spi_ReadWriteByte((u8)(addr >>16));
Spi_ReadWriteByte((u8)(addr >>8));
Spi_ReadWriteByte((u8)addr);
for ( i=0; i{
Spi_ReadWriteByte(databuf[i]);
}

W25Q80_Disable();
}


// 对FLASH进行SECTOR擦除
void EraseW25Q80Operation(u32 addr)
{
u32 i = 0;
u8 temp;

temp = ReadW25Q80StatusRegister();
while( temp&0x01 ) // 等待FLASH芯片结束BUSY状态
{
temp = ReadW25Q80StatusRegister();
if ( ++i>1000000 ) return;
}

SetW25Q80WriteEnable(); // 设置芯片写使能

W25Q80_Enable();

Spi_ReadWriteByte(SECTOR_ERASE);
Spi_ReadWriteByte((u8)(addr >>16));
Spi_ReadWriteByte((u8)(addr >>8));
Spi_ReadWriteByte((u8)addr);

W25Q80_Disable();
}


// 读取FLASH芯片的JEDEC ID信息
void ReadW25Q80DeviceID(u8 *buf)
{
W25Q80_Enable();

Spi_ReadWriteByte(Manufacturer_DeviceID);
buf[0] = Spi_ReadWriteByte(0xF0);
buf[1] = Spi_ReadWriteByte(0xF0);
buf[2] = Spi_ReadWriteByte(0xF0);

W25Q80_Disable();
}