Eclipse开发调试ARM裸机程序(七)sd卡读写

运行结果如下：

S3C2440上的寄存器就多了，有几个难以理解的写下来：SDICCON的后7位是发送命令值。但是真正填写的时候并不是命令值而是＆上了一个值（0x64），这个还没有找出原因所在。例如如果发送命令2，SDICCON的后7位应该是这样的：(0x40 | 2)。

四、文件系统

如果只是简单的放一个数据，没有文件系统会显示无力，就无法在PC直接上查看。SD卡应该有一个文件系统如常用的fat32。这个u-boot中有实现，这里就先不做了。

五、代码

完整代码这里下载：http://download.csdn.net/detail/kangear/5303482

这里贴出sdi.c:

/* @file     sdi.c* @brief    sd卡 读写* @details  本程序实现了，读SD卡的CSD寄存器；读写SD卡，并用LED显示。*           程序正常：led1首先点亮，然后是0-15的二进制显示*           程序出错：led2首先点亮，然后是乱无序的二进制显示*           目前只能读写2G以下的SD卡*           （启动代码是适用于mini2440 nand 256M的开发板）*           读写SD有三种模式：中断，DMA中断，查询。本程序使用的是查询* @author   kangear* @date     2013-4-26* @version  A001* @par Copyright (c):*           XXX公司* @par History:*   version: author, date, desc\n** docs    1.SD Specifications Part 1 Physical Layer Simplified Specification Version 4.10 January 22, 2013.pdf*         2.SD Specifications Part A1 Advanced Security SD Extension Simplified Specification Version 2.00 May 18, 2010.pdf*         3.SD Specifications Part A2 SD Host Controller Simplified Specification Version 3.00 February 25, 2011.pdf*         4.SD Specifications Part E1 SDIO Simplified Specification Version 3.00 February 25, 2011.pdf** download addr:https://www.sdcard.org/downloads/pls/simplified_specs/*///#include //#include #include "def.h"//#include "option.h"//#include "2440addr.h"#include "s3c24xx.h"//#include "2440lib.h"#include "sdi.h"/** 用在SDICCON中的[７:０]　现在没有搞懂它的实际意义* ＣＭＤ１　＝　MAGIC_NUMBER | 1*/#define	MAGIC_NUMBER 64#define INICLK	300000#define SDCLK	24000000	//PCLK=49.392MHz#define POL	0#define INT	1#define DMA	2int CMD13(void);    // Send card statusint CMD9(void);unsigned int *Tx_buffer;	//128[word]*16[blk]=8192[byte]unsigned int *Rx_buffer;	//128[word]*16[blk]=8192[byte]volatile unsigned int rd_cnt;volatile unsigned int wt_cnt;volatile unsigned int block;volatile unsigned int TR_end=0;int Wide=0; // 0:1bit, 1:4bitint MMC=0;  // 0:SD  , 1:MMCint  Maker_ID;char Product_Name[7]; int  Serial_Num;int PCLK = 50000000;volatile int RCA;void Test_SDI(void){U32 save_rGPEUP, save_rGPECON;RCA=0;MMC=0;block=3072;   //3072Blocks=1.5MByte, ((2Block=1024Byte)*1024Block=1MByte)save_rGPEUP=GPEUP;save_rGPECON=GPECON;GPEUP  = 0xf83f;     // SDCMD, SDDAT[3:0] => PU En.GPECON = 0xaaaaaaaa;	//SDCMD, SDDAT[3:0]//Uart_Printf("\nSDI Card Write and Read Test\n");if(!SD_card_init())return;TR_Buf_new();Wt_Block();Rd_Block();View_Rx_buf();Card_sel_desel(0);	// Card deselectif(!CMD9())//Uart_Printf("Get CSD fail!!!\n");SDIDCON=0;//tark???SDICSTA=0xffff;GPEUP=save_rGPEUP;GPECON=save_rGPECON;}void TR_Buf_new(void){//-- Tx & Rx Buffer initializeint i, j;Tx_buffer=(unsigned int *)0x31000000;j=0;for(i=0;i<2048;i++)	//128[word]*16[blk]=8192[byte]*(Tx_buffer+i)=i+j;Flush_Rx_buf();}void Flush_Rx_buf(void){//-- Flushing Rx buffer int i;Rx_buffer=(unsigned int *)0x31800000;for(i=0;i<2048;i++)	//128[word]*16[blk]=8192[byte]*(Rx_buffer+i)=0;//Uart_Printf("End Rx buffer flush\n");}void View_Rx_buf(){//-- Display Rx buffer int i,error=0;Tx_buffer=(unsigned int *)0x31000000;Rx_buffer=(unsigned int *)0x31800000;//Uart_Printf("Check Rx data\n");for(i=0;i<128*block;i++){if(Rx_buffer[i] != Tx_buffer[i]){//Uart_Printf("\nTx/Rx error\n");//Uart_Printf("%d:Tx-0x%08x, Rx-0x%08x\n",i,Tx_buffer[i], Rx_buffer[i]);error=1;break;}////Uart_Printf(".");}if(!error){//Uart_Printf("\nThe Tx_buffer is same to Rx_buffer!\n");//Uart_Printf("SD CARD Write and Read test is OK!\n");}}void View_Tx_buf(void){}int SD_card_init(void){//-- SD controller & card initialize int i;/* Important notice for MMC test condition *//* Cmd & Data lines must be enabled by pull up resister */SDIPRE=PCLK/(INICLK)-1;	// 400KHz//Uart_Printf("Init. Frequency is %dHz\n",(PCLK/(SDIPRE+1)));SDICON=(1<4)|1;	// Type B, clk enableSDIFSTA=SDIFSTA|(1<16);	//YH 040223 FIFO resetSDIBSIZE=0x200;		// 512byte(128word)SDIDTIMER=0x7fffff;		// Set timeout countfor(i=0;i<0x1000;i++);  // Wait 74SDCLK for MMC cardCMD0();//Uart_Printf("In idle\n");//-- Check SD card OCRif(!Chk_SD_OCR()){// failGPBDAT = (~(2<5));	 	// 点亮LED2//Uart_Printf("Initialize fail\nNo Card assertion\n");return 0;}//	Uart_Printf("In SD ready\n");GPBDAT = (~(1<5));	 	// 点亮LED1do{//-- Check attaced cards, it makes card identification stateSDICARG = 0x0; // CMD2(stuff bit)SDICCON = (0x1 < 10) | (0x1 < 9) | (0x1 < 8) | (MAGIC_NUMBER | 2); //lng_resp, wait_resp, start, CMD2//-- Check end of CMD2} while (!Chk_CMDend(2, 1));SDICSTA=0xa00;	// Clear cmd_end(with rsp)//Uart_Printf("End id\n");do{//--Send RCASDICARG = MMC < 16; // CMD3(MMC:Set RCA, SD:Ask RCA-->SBZ)SDICCON = (0x1 < 9) | (0x1 < 8) | (MAGIC_NUMBER | 3); // sht_resp, wait_resp, start, CMD3//-- Check end of CMD3if (!Chk_CMDend(3, 1))continue;SDICSTA = 0xa00; // Clear cmd_end(with rsp)//--Publish RCARCA = (SDIRSP0 & 0xffff0000) >> 16;//Uart_Printf("RCA=0x%x\n",RCA);SDIPRE = PCLK / (SDCLK) - 1; // Normal clock=25MHz//Uart_Printf("SD Frequency is %dHz\n",(PCLK/(SDIPRE+1)));//--State(stand-by) checkif (SDIRSP0 & 0x1e00 != 0x600) // CURRENT_STATE checkcontinue;} while (0);//Uart_Printf("In stand-by\n");Card_sel_desel(1);	// SelectSet_4bit_bus();return 1;}void Card_sel_desel(char sel_desel){//-- Card select or deselectif(sel_desel){do{SDICARG = RCA < 16; // CMD7(RCA,stuff bit)SDICCON = (0x1 < 9) | (0x1 < 8) | (MAGIC_NUMBER | 7); // sht_resp, wait_resp, start, CMD7//-- Check end of CMD7if (!Chk_CMDend(7, 1))continue;SDICSTA = 0xa00; // Clear cmd_end(with rsp)//--State(transfer) checkif (SDIRSP0 & 0x1e00 != 0x800)continue;} while (0);}else{do{SDICARG = 0 < 16; //CMD7(RCA,stuff bit)SDICCON = (0x1 < 8) | (MAGIC_NUMBER | 7); //no_resp, start, CMD7//-- Check end of CMD7if (!Chk_CMDend(7, 0))continue;} while (0);SDICSTA=0x800;	// Clear cmd_end(no rsp)}}//void __irq Rd_Int(void)//{//	U32 i,status;////	status=SDIFSTA;//	if( (status&0x200) == 0x200 )	// Check Last