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發(fā)一個stm32 usb虛擬U盤的例程，采用spi w25q16 flash 芯片
1、該例程為USB-Mass_Storage-SD Card使用例程。
2、使用說明
(1)工程文件路徑：例程目錄\USB-Mass_Storage-SD Card\MDK-ARM\Project.uvproj。
(2)請使用MDK 4.0以上版本打開,MDK版本過低會導(dǎo)致無法識別工程。
(3)下載調(diào)試工具為ULINK。
(4)請將USB線插板子上。
(6)HEX文件下載到板子后,打開我的電腦往新識別磁盤拷貝文件(LED為讀寫指示燈),成功拷貝表明例程運行正確。
3、注意事項
請務(wù)必在下載、調(diào)試、運行過程中，保持板子上電、ULINK連接并插在電腦上。
USB-Mass_Storage-SPI_Flash(W25X16)
單片機源程序如下:
- #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模塊的初始化代碼，配置成主機模式，訪問SD Card/W25X16/24L01/JF24C
- //SPI口初始化
- //這里針是對SPI1的初始化
- SPI_InitTypeDef SPI_InitStructure;
- #define DF_CS_ENABLE() GPIO_ResetBits(GPIOB,GPIO_Pin_6) //選中SD卡
- #define DF_CS_DISABLE() GPIO_SetBits(GPIOB,GPIO_Pin_6) //不選中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; //復(fù)用推挽輸出
- 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; //設(shè)置SPI單向或者雙向的數(shù)據(jù)模式:SPI設(shè)置為雙線雙向全雙工
- SPI_InitStructure.SPI_Mode = SPI_Mode_Master; //設(shè)置SPI工作模式:設(shè)置為主SPI
- SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b; //設(shè)置SPI的數(shù)據(jù)大小:SPI發(fā)送接收8位幀結(jié)構(gòu)
- SPI_InitStructure.SPI_CPOL = SPI_CPOL_High; //選擇了串行時鐘的穩(wěn)態(tài):時鐘懸空高
- SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge; //數(shù)據(jù)捕獲于第二個時鐘沿
- SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; //NSS信號由硬件（NSS管腳）還是軟件（使用SSI位）管理:內(nèi)部NSS信號有SSI位控制
- SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256; //定義波特率預(yù)分頻的值:波特率預(yù)分頻值為256
- SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; //指定數(shù)據(jù)傳輸從MSB位還是LSB位開始:數(shù)據(jù)傳輸從MSB位開始
- SPI_InitStructure.SPI_CRCPolynomial = 7; //CRC值計算的多項式
- SPI_Init(SPI1, &SPI_InitStructure); //根據(jù)SPI_InitStruct中指定的參數(shù)初始化外設(shè)SPIx寄存器
-
- SPI_Cmd(SPI1, ENABLE); //使能SPI外設(shè)
-
- SPIx_ReadWriteByte(0xff);//啟動傳輸
- }
- //SPIx 讀寫一個字節(jié)
- //TxData:要寫入的字節(jié)
- //返回值:讀取到的字節(jié)
- u8 SPIx_ReadWriteByte(u8 TxData)
- {
- u8 retry=0;
- while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET) //檢查指定的SPI標(biāo)志位設(shè)置與否:發(fā)送緩存空標(biāo)志位
- {
- retry++;
- if(retry>200){printf("SPI Write TimeOut!\r\n");return 0;}
- }
- SPI_I2S_SendData(SPI1, TxData); //通過外設(shè)SPIx發(fā)送一個數(shù)據(jù)
- retry=0;
- while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET)//檢查指定的SPI標(biāo)志位設(shè)置與否:接受緩存非空標(biāo)志位
- {
- retry++;
- if(retry>200){printf("SPI Read TimeOut!\r\n");return 0;}
- }
- return SPI_I2S_ReceiveData(SPI1); //返回通過SPIx最近接收的數(shù)據(jù)
- }
- //SPI硬件層初始化
- 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 ; //推挽輸出
- 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();
- }
- // 讀
- u8 W25X16_Read(u32 DstAdr, u8* RcvBufPt ,u32 NByte)
- {
- u32 i = 0;
- if ((DstAdr+NByte > MAX_ADDR)||(NByte == 0)) return (0); /* 檢查入口參數(shù) */
- 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)); /* 發(fā)送地址信息:該地址由3個字節(jié)組成 */
- SPIx_ReadWriteByte(((DstAdr & 0xFFFF) >> 8));
- SPIx_ReadWriteByte(DstAdr & 0xFF);
- SPIx_ReadWriteByte(0xff); //啞字節(jié)
- 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)); /* 發(fā)送地址信息:該地址由3個字節(jié)組成 */
- SPIx_ReadWriteByte(((sec & 0xFFFF) >> 8));
- SPIx_ReadWriteByte(sec & 0xFF);
- // SPIx_ReadWriteByte(0xff); //啞字節(jié)
- 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;
- }
- //寫一個扇區(qū)
- //每個扇區(qū)有4096個字節(jié)
- 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)); /* 發(fā)送3個字節(jié)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)); /* 發(fā)送3個字節(jié)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;
- }
所有資料51hei提供下載:
USB-Mass_Storage-SPI_Flash(W25X16).rar
(538.94 KB, 下載次數(shù): 359)
2018-10-26 16:16 上傳
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