READ_SD_CARD.rar_SD-read driver_SD卡 源代码_sd 驱动_sd卡 单片机_sd卡 驱动

/************************************************************************************** //------------------ MMC/SD-Card Reading and Writing implementation ------------------- //FileName : mmc.c //Function : Connect AVR to MMC/SD //Created by : ZhengYanbo //Created date : 15/08/2005 //Version : V1.2 //Last Modified: 19/08/2005 //Filesystem : Read or Write MMC without any filesystem //CopyRight (c) 2005 ZhengYanbo //Email: Datazyb_007@163.com ****************************************************************************************/ #include <avr/io.h> #include "mmc.h" #if USE_MMC //**************************************************************************** // Port Init void MMC_Port_Init(void) //**************************************************************************** { //Config ports cbi(MMC_Direction_REG,SPI_DI); //Set Pin MMC_DI as Input sbi(MMC_Direction_REG,SPI_Clock); //Set Pin MMC_Clock as Output sbi(MMC_Direction_REG,SPI_DO); //Set Pin MMC_DO as Output sbi(MMC_Direction_REG,MMC_Chip_Select); //Set Pin MMC_Chip_Select as Output //busy led port init sbi(MMC_Direction_REG,SPI_BUSY); //Set spi busy led port output sbi(MMC_Write,SPI_BUSY); //busy led off sbi(MMC_Write,MMC_Chip_Select); //Set MMC_Chip_Select to High,MMC/SD Invalid. } //**************************************************************************** //Routine for Init MMC/SD card(SPI-MODE) unsigned char MMC_Init(void) //**************************************************************************** { unsigned char retry,temp; unsigned char i; unsigned char CMD[] = {0x40,0x00,0x00,0x00,0x00,0x95}; //MMC_Port_Init(); //Init SPI port for(i=0;i<200;i++) //Wait MMC/SD ready... { asm("nop"); } Init_Flag=1; //Set the init flag for (i=0;i<0x0f;i++) { Write_Byte_MMC(0xff); //send 74 clock at least!!! } //Send Command CMD0 to MMC/SD Card retry=0; do { //retry 200 times to send CMD0 command temp=Write_Command_MMC(CMD); retry++; if(retry==200) { //time out return(INIT_CMD0_ERROR);//CMD0 Error! } } while(temp!=1); //Send Command CMD1 to MMC/SD-Card CMD[0] = 0x41; //Command 1 CMD[5] = 0xFF; retry=0; do { //retry 100 times to send CMD1 command temp=Write_Command_MMC(CMD); retry++; if(retry==100) { //time out return(INIT_CMD1_ERROR);//CMD1 Error! } } while(temp!=0); Init_Flag=0; //Init is completed,clear the flag MMC_Disable(); //set MMC_Chip_Select to high return(0); //All commands have been taken. } //**************************************************************************** //returns the : // size of the card in MB ( ret * 1024^2) == bytes // sector count and multiplier MB are in u08 == C_SIZE / (2^(9-C_SIZE_MULT)) // name of the media void MMC_get_volume_info(void) //**************************************************************************** { //unsigned char i; VOLUME_INFO_TYPE MMC_volume_Info,*vinf; vinf=&MMC_volume_Info; //Init the pointoer; // read the CSD register Read_CSD_MMC(sectorBuffer.data); // get the C_SIZE value. bits [73:62] of data // [73:72] == sectorBuffer.data[6] && 0x03 // [71:64] == sectorBuffer.data[7] // [63:62] == sectorBuffer.data[8] && 0xc0 vinf->sector_count = sectorBuffer.data[6] & 0x03; vinf->sector_count <<= 8; vinf->sector_count += sectorBuffer.data[7]; vinf->sector_count <<= 2; vinf->sector_count += (sectorBuffer.data[8] & 0xc0) >> 6; // get the val for C_SIZE_MULT. bits [49:47] of sectorBuffer.data // [49:48] == sectorBuffer.data[5] && 0x03 // [47] == sectorBuffer.data[4] && 0x80 vinf->sector_multiply = sectorBuffer.data[9] & 0x03; vinf->sector_multiply <<= 1; vinf->sector_multiply += (sectorBuffer.data[10] & 0x80) >> 7; // work out the MBs // mega bytes in u08 == C_SIZE / (2^(9-C_SIZE_MULT)) vinf->size_MB = vinf->sector_count >> (9-vinf->sector_multiply); // get the name of the card Read_CID_MMC(sectorBuffer.data); vinf->name[0] = sectorBuffer.data[3]; vinf->name[1] = sectorBuffer.data[4]; vinf->name[2] = sectorBuffer.data[5]; vinf->name[3] = sectorBuffer.data[6]; vinf->name[4] = sectorBuffer.data[7]; vinf->name[5] = 0x00; //end flag /*---------------------------------------------------------- LCDclrscr(); //Print Product name on lcd i=0; writestring("Product:"); while((vinf->name[i]!=0x00)&&(i<16)) writechar(vinf->name[i++]); //Print Card Size(eg:128MB) gotoxy(1,0); writestring("Tot:"); writeNumber(vinf->size_MB); writestring("MB "); //gotoxy(2,0); //writestring("sector_mult:"); writeNumber(vinf->sector_multiply); //gotoxy(3,0); //writestring("sect_cnt:"); writeNumber(vinf->sector_count);*/ } //**************************************************************************** //Send a Command to MMC/SD-Card //Return: the second byte of response register of MMC/SD-Card unsigned char Write_Command_MMC(unsigned char *CMD) //**************************************************************************** { unsigned char tmp; unsigned char retry=0; unsigned char i; //set MMC_Chip_Select to high (MMC/SD-Card disable) MMC_Disable(); //send 8 Clock Impulse Write_Byte_MMC(0xFF); //set MMC_Chip_Select to low (MMC/SD-Card active) MMC_Enable(); //send 6 Byte Command to MMC/SD-Card for (i=0;i<0x06;i++) { Write_Byte_MMC(*CMD++); } //get 16 bit response Read_Byte_MMC(); //read the first byte,ignore it. do { //Only last 8 bit is used here.Read it out. tmp = Read_Byte_MMC(); retry++; } while((tmp==0xff)&&(retry<100)); return(tmp); } //**************************************************************************** //Routine for reading a byte from MMC/SD-Card unsigned char Read_Byte_MMC(void) //**************************************************************************** { unsigned char temp=0; unsigned char i; cbi(MMC_Write,SPI_BUSY); //MMC_BUSY_LED=0; //Software SPI for (i=0; i<8; i++) //MSB First { cbi(MMC_Write,SPI_Clock); //Clock Impuls (Low) if(Init_Flag) delay_us_8_; //read mmc data out pin if((MMC_Read&(1<<SPI_DI))!=0) temp = (temp << 1) + 1; else temp = (temp << 1) + 0; sbi(MMC_Write,SPI_Clock); //set Clock Impuls High if(Init_Flag) delay_us_8_; } sbi(MMC_Write,SPI_BUSY); //MMC_BUSY_LED=1; return (temp); } //**************************************************************************** //Routine for sending a byte to MMC/SD-Card void Write_Byte_MMC(unsigned char value) //**************************************************************************** { unsigned char i; cbi(MMC_Write,SPI_BUSY); //MMC_BUSY_LED=0; //Software SPI for (i=0; i<8; i++) { //write a byte if (((value >> (7-i)) & 0x01)==0x01) sbi(MMC_Write,SPI_DO); //Send bit by bit(MSB First) else cbi(MMC_Write,SPI_DO); cbi(MMC_Write,SPI_Clock); //set Clock Impuls low if(Init_Flag) delay_us_8_; sbi(MMC_Write,SPI_Clock); //set Clock Impuls High if(Init_Flag) delay_us_8_; }//write a byte sbi(MMC_Write,SPI_DO); //set Output High sbi(MMC_Write,SPI_BUSY); //MMC_BUSY_LED=1; } //**************************************************************************** //Routine for writing a Block(512Byte) to MMC/SD-Card //Return 0 if sector writing is completed. unsigned char MMC_write_sector(unsigned long addr,unsigned char *Buffer) //**************************************************************************** { unsigned char tmp,