STM32 USB虚拟U盘例程 spi w25q16 flash芯片源码 -

#include <stm32f10x.h>
#include "W25X16.h"
#include <stdio.h>
#define MAX_ADDR 0x1fffff
#define SEC_SIZE 4095 //byte
#define SEC_MAX 511
//以下是SPI模块的初始化代码，配置成主机模式，访问SD Card/W25X16/24L01/JF24C
//SPI口初始化
//这里针是对SPI1的初始化
SPI_InitTypeDef SPI_InitStructure;
#define DF_CS_ENABLE() GPIO_ResetBits(GPIOB,GPIO_Pin_6) //选中SD卡
#define DF_CS_DISABLE() GPIO_SetBits(GPIOB,GPIO_Pin_6) //不选中SD卡
u8 SPIx_ReadWriteByte(u8 TxData);
void SPIx_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA|RCC_APB2Periph_SPI1, ENABLE );
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_SetBits(GPIOA,GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7);
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; //设置SPI单向或者双向的数据模式:SPI设置为双线双向全双工
SPI_InitStructure.SPI_Mode = SPI_Mode_Master; //设置SPI工作模式:设置为主SPI
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b; //设置SPI的数据大小:SPI发送接收8位帧结构
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High; //选择了串行时钟的稳态:时钟悬空高
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge; //数据捕获于第二个时钟沿
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; //NSS信号由硬件（NSS管脚）还是软件（使用SSI位）管理:内部NSS信号有SSI位控制
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256; //定义波特率预分频的值:波特率预分频值为256
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; //指定数据传输从MSB位还是LSB位开始:数据传输从MSB位开始
SPI_InitStructure.SPI_CRCPolynomial = 7; //CRC值计算的多项式
SPI_Init(SPI1, &SPI_InitStructure); //根据SPI_InitStruct中指定的参数初始化外设SPIx寄存器
SPI_Cmd(SPI1, ENABLE); //使能SPI外设
SPIx_ReadWriteByte(0xff);//启动传输
}
//SPIx 读写一个字节
//TxData:要写入的字节
//返回值:读取到的字节
u8 SPIx_ReadWriteByte(u8 TxData)
{
u8 retry=0;
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET) //检查指定的SPI标志位设置与否:发送缓存空标志位
{
retry++;
if(retry>200){printf("SPI Write TimeOut!\r\n");return 0;}
}
SPI_I2S_SendData(SPI1, TxData); //通过外设SPIx发送一个数据
retry=0;
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET)//检查指定的SPI标志位设置与否:接受缓存非空标志位
{
retry++;
if(retry>200){printf("SPI Read TimeOut!\r\n");return 0;}
}
return SPI_I2S_ReceiveData(SPI1); //返回通过SPIx最近接收的数据
}
//SPI硬件层初始化
void Flash_SPI_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB, ENABLE );
GPIO_InitStructure.GPIO_Pin =GPIO_Pin_4 | GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP ; //推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_SetBits(GPIOB,GPIO_Pin_6);
GPIO_SetBits(GPIOB,GPIO_Pin_7);
GPIO_SetBits(GPIOA,GPIO_Pin_4);
SPIx_Init();
}
// 读
u8 W25X16_Read(u32 DstAdr, u8* RcvBufPt ,u32 NByte)
{
u32 i = 0;
if ((DstAdr+NByte > MAX_ADDR)||(NByte == 0)) return (0); /* 检查入口参数 */
DF_CS_ENABLE();
SPIx_ReadWriteByte(0x05); //
while(SPIx_ReadWriteByte(0xff)&0x01)
{}
DF_CS_DISABLE();
DF_CS_ENABLE();
SPIx_ReadWriteByte(0x0B); //read comand
SPIx_ReadWriteByte(((DstAdr & 0xFFFFFF) >> 16)); /* 发送地址信息:该地址由3个字节组成 */
SPIx_ReadWriteByte(((DstAdr & 0xFFFF) >> 8));
SPIx_ReadWriteByte(DstAdr & 0xFF);
SPIx_ReadWriteByte(0xff); //哑字节
for (i = 0; i < NByte; i++)
{
RcvBufPt[i] = SPIx_ReadWriteByte(0xFF);
}
DF_CS_DISABLE();
return 1;
}
u8 W25X16_SectorRead(u32 sec, u8* RcvBufPt)
{
u16 i;
sec*=4096;
DF_CS_ENABLE();
SPIx_ReadWriteByte(0x03); //read comand
SPIx_ReadWriteByte(((sec & 0xFFFFFF) >> 16)); /* 发送地址信息:该地址由3个字节组成 */
SPIx_ReadWriteByte(((sec & 0xFFFF) >> 8));
SPIx_ReadWriteByte(sec & 0xFF);
// SPIx_ReadWriteByte(0xff); //哑字节
for (i = 0; i < 4096; i++)
{
RcvBufPt[i] = SPIx_ReadWriteByte(0xFF);
}
DF_CS_DISABLE();
DF_CS_ENABLE();
SPIx_ReadWriteByte(0x05); //
while(SPIx_ReadWriteByte(0xff)&0x01)
{}
DF_CS_DISABLE();
return 1;
}
//写一个扇区
//每个扇区有4096个字节
u8 W25X16_SectorWrite(u32 sec, u8* SndbufPt)
{
u32 i = 0, j;
// u32 addr;
sec*=4096;
for(j=0;j<16;j++)
{
DF_CS_ENABLE();
SPIx_ReadWriteByte(0x06); //write enable
DF_CS_DISABLE();
DF_CS_ENABLE();
SPIx_ReadWriteByte(0x02); //page program
SPIx_ReadWriteByte((( sec& 0xFFFFFF) >> 16)); /* 发送3个字节的地址信息 */
SPIx_ReadWriteByte(((sec& 0xFFFF) >> 8));
SPIx_ReadWriteByte( sec& 0xFF);
for(i=0;i<256;i++)
{
SPIx_ReadWriteByte(SndbufPt[i]);
}
DF_CS_DISABLE();
SndbufPt+=256;
sec+=256;
DF_CS_ENABLE();
SPIx_ReadWriteByte(0x05); // 等待 BUZY = 0
while(SPIx_ReadWriteByte(0xff)&0x01)
{}
DF_CS_DISABLE();
}
return 1;
}
//sec1,sec (0,511)
u8 W25X16_SectorErase(u32 sec)
{
sec *=4096;
DF_CS_ENABLE();
SPIx_ReadWriteByte(0x06); //write enable WEL = 1
DF_CS_DISABLE();
DF_CS_ENABLE();
SPIx_ReadWriteByte(0x20); // sector erase reg
SPIx_ReadWriteByte((((sec) & 0xFFFFFF) >> 16)); /* 发送3个字节的地址信息 */
SPIx_ReadWriteByte((((sec) & 0xFFFF) >> 8));
SPIx_ReadWriteByte((sec) & 0xFF);
DF_CS_DISABLE();
DF_CS_ENABLE();
SPIx_ReadWriteByte(0x05); // 等待 BUZY = 0
while(SPIx_ReadWriteByte(0xff)&0x01)
{}
DF_CS_DISABLE();
return 1;
}

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