stm32和51單片機讀寫SD卡的源碼與電路圖

ID:180782 · 發表于 2018-5-28 19:06

部分51單片機程序的，源文件里面還有stm32的

電路原理圖如下：

單片機源程序：

/*
* SD模塊測試程序
*
* 用途：SD模塊測試程序
*
* 作者日期備注
* Huafeng Lin 20010/10/03 新增
* Huafeng Lin 20010/10/03 修改
*
*/
#include "REG52.H"
////////////////////////****************/
unsigned char *SDInfo1="SD Init Success.";
unsigned char *SDInfo2="SD Init Fail.";
unsigned int xdata ReadBuffer[128] ;
unsigned int xdata WriteBuffer[128] ;
unsigned int BlockSize;
unsigned long int BlockNR;
//sbit sd_clk=P3^2;
//sbit sd_cse=P3^0;
//sbit sd_dai=P3^3; //Do
//sbit sd_dao=P3^1; //DI
sbit sd_cse=P1^0;
sbit sd_dao=P1^1;//DI
sbit sd_clk=P1^2;
sbit sd_dai=P1^3;//Do
void Delay5us()
{
unsigned char a=0;
for(a=0;a<40;a++)
;
}
//********************************************
void SD_2Byte_Write(unsigned int IOData)
{
unsigned char BitCounter;
for (BitCounter=0;BitCounter<16;BitCounter++)
{
sd_clk=0;//CLK Low
if(IOData&0x8000)//If the MSB of IOData is 1, then Do=1, else Do=0.
sd_dao=1;//Do High
else
sd_dao=0;//Do Low
sd_clk=1;//CLK High
Delay5us();
IOData=IOData<<1;//Because the MSB is transmitted firstly, shift to next lower bit.
}
}
//********************************************
void SD_Write(unsigned int IOData)
{
unsigned char BitCounter;
IOData=IOData<<8;
for (BitCounter=0;BitCounter<8;BitCounter++)
{
sd_clk=0;//CLK Low
if(IOData&0x8000)//If the MSB of IOData is 1, then Do=1, else Do=0.
sd_dao=1;//Do High
else
sd_dao=0;//Do Low
sd_clk=1;//CLK High
Delay5us();
IOData=IOData<<1;//Because the MSB is transmitted firstly, shift to next lower bit.
}
}
//********************************************
unsigned int SD_2Byte_Read()
{
unsigned int Buffer;
unsigned char BitCounter;
Buffer=0;
for (BitCounter=0;BitCounter<16;BitCounter++)
{
sd_clk=0;//CLK Low
Delay5us();
sd_clk=1;//CLK High
Buffer=Buffer<<1;//Because the MSB is transmitted firstly, shift to next lower bit.
//Because the LSB will be damaged, we can not put this line under next line.
if(sd_dai)
Buffer++;//If SPI_Din=1 then the LSB_of_Buffer=1.
}
return Buffer;
}
//********************************************
unsigned int SD_Read()
{
unsigned int Buffer;
unsigned char BitCounter;
Buffer=0xffff;
for (BitCounter=0;BitCounter<8;BitCounter++)
{
sd_clk=0;//CLK Low
Delay5us();
sd_clk=1;//CLK High
Buffer=Buffer<<1;//Because the MSB is transmitted firstly, shift to next lower bit.
//Because the LSB will be damaged, we can not put this line under next line.
if(sd_dai)
Buffer++;//If SPI_Din=1 then the LSB_of_Buffer=1.
}
return Buffer;
}
//********************************************
unsigned int SD_CMD_Write(unsigned int CMDIndex,unsigned long CMDArg,unsigned int ResType,unsigned int CSLowRSV)//ResType:Response Type, send 1 for R1; send 2 for R1b; send 3 for R2.
{ //There are 7 steps need to do.(marked by [1]-[7])
unsigned int temp,Response,Response2,CRC,MaximumTimes;
Response2=0;
MaximumTimes=10;
CRC=0x0095;//0x0095 is only valid for CMD0
if (CMDIndex!=0) CRC=0x00ff;
sd_cse=0;//[1] CS Low
SD_2Byte_Write(((CMDIndex|0x0040)<<8)+(CMDArg>>24));//[2] Transmit Command_Index & 1st Byte of Command_Argument.
SD_2Byte_Write((CMDArg&0x00ffff00)>>8); //[2] 2nd & 3rd Byte of Command_Argument
SD_2Byte_Write(((CMDArg&0x000000ff)<<8)+CRC); //[2] 4th Byte of Command_Argument & CRC only for CMD0
sd_dao=1;//[3] Do High
//[3] Restore Do to High Level
for (temp=0;temp<8;temp++)//[4] Provide 8 extra clock after CMD
{
sd_clk=0;//CLK Low
Delay5us();
sd_clk=1;//CLK High
Delay5us();
}
switch (ResType)//[5] wait response
{
case 1://R1
{
do
Response=SD_Read();
while (Response==0xffff);
break;
}
case 2://R1b
{
do
Response=SD_Read();
while (Response==0xffff);//Read R1 firstly
do
Response2=SD_Read()-0xff00;
while (Response2!=0);//Wait until the Busy_Signal_Token is non-zero
break;
}
case 3: Response=SD_2Byte_Read();break;//R2
}
if (CSLowRSV==0) sd_cse=1;//[6] CS High (if the CMD has data block response CS should be kept low)
for (temp=0;temp<8;temp++)//[7] Provide 8 extra clock after card response
{
sd_clk=0;//CLK Low
Delay5us();
sd_clk=1;//CLK High
Delay5us();
}
return Response;
}
//********************************************
unsigned int SD_Reset_Card()
{
unsigned int temp,MaximumTimes;
MaximumTimes=10;
for (temp=0;temp<80;temp++)//Send 74+ Clocks
{
sd_clk=0;//CLK Low
Delay5us();
sd_clk=1;//CLK High
Delay5us();
}
return SD_CMD_Write(0x0000,0x00000000,1,0);//Send CMD0
}
//********************************************
unsigned int SD_Initiate_Card()//Polling the card after reset
{
unsigned int temp,Response,MaximumTimes;
MaximumTimes=50;
for(temp=0;temp<MaximumTimes;temp++)
{
Response=SD_CMD_Write(0x0037,0x00000000,1,0);//Send CMD55
Response=SD_CMD_Write(0x0029,0x00000000,1,0);//Send ACMD41
if (Response==0xff00)
temp=MaximumTimes;
}
return Response;
}
//********************************************
unsigned int SD_Get_CardInfo()//Read CSD register
{
unsigned int temp,Response,MaximumTimes;
MaximumTimes=50;
for(temp=0;temp<MaximumTimes;temp++)
{
Response=SD_CMD_Write(9,0x00000000,1,1);//Send CMD9
if (Response==0xff00)
temp=MaximumTimes;
}
for (temp=0;temp<8;temp++)//Provide 8 clock to romove the first byte of data response (0x00fe)
{
sd_clk=0;//CLK Low
Delay5us();
sd_clk=1;//CLK High
Delay5us();
}
for (temp=0;temp<8;temp++) ReadBuffer[temp]=SD_2Byte_Read();//Get the CSD data
for (temp=0;temp<16;temp++)//Provide 16 clock to remove the last 2 bytes of data response (CRC)
{
sd_clk=0;//CLK Low
Delay5us();
sd_clk=1;//CLK High
Delay5us();
}
sd_cse=1;//CS_High()
for (temp=0;temp<8;temp++)//Provide 8 extra clock after data response
{
sd_clk=0;//CLK Low
Delay5us();
sd_clk=1;//CLK High
Delay5us();
}
BlockNR=((ReadBuffer[3]<<2)&0x0fff)+((ReadBuffer[4]>>14)&0x0003)+1;//Calcuate MULT
BlockNR=BlockNR*(0x0002<<(((ReadBuffer[4]<<1)&0x0007)+((ReadBuffer[5]>>15)&0x0001)+1));//Calcuate Block_Number
return Response;
}
//********************************************
unsigned int SD_Overall_Initiation()
{
unsigned int Response,Response_2;
Response=0x0000;
Response_2=0xff00;
sd_dao=1;//[1] Do High
//[1] Do must be High when there is no transmition
do
Response=SD_Reset_Card();//[2] Send CMD0
while (Response!=0xff01);
if (Response!=0xff01) Response_2+=8;
//Response=SD_CMD_Write(8,0x00000000,1,0);//Send CMD8
Response=SD_Initiate_Card();//[3] Send CMD55+ACMD41
if (Response==0xff00)
;
else
{
Response_2+=4;
;
}
do
Response=SD_Get_CardInfo();//[4] Read CSD
while (Response!=0xff00);
if (Response==0xff01) Response_2+=2;
return Response_2;
// 0000|0000||0000|0000 Response_2
// |||_CSD Fail
// ||__CMD55+ACMD41 Fail
// |___CMD0 Fail
}
//********************************************

復制代碼

ID:1042569 · 發表于 2022-9-2 22:21

請問你那個51單片機讀sd卡的那個程序電路圖怎么接???

ID:513213 · 發表于 2022-9-3 18:02

SD卡的元件能一起提供嗎？

ID:79094 · 發表于 2025-4-17 23:30

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stm32和51單片機讀寫SD卡的源碼與電路圖

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