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 */
rSDIPRE=PCLK/(INICLK)-1; // 400KHz
Uart_Printf("Init. Frequency is %dHz\n",(PCLK/(rSDIPRE+1)));
rSDICON=(1<<4)|1; // Type B, clk enable
rSDIFSTA=rSDIFSTA|(1<<16); //YH 040223 FIFO reset
rSDIBSIZE=0x200; // 512byte(128word)
rSDIDTIMER=0x7fffff; // Set timeout count
for(i=0;i<0x1000;i++); // Wait 74SDCLK for MMC card
CMD0();
Uart_Printf("In idle\n");
//-- Check MMC card OCR
if(Chk_MMC_OCR())
{
Uart_Printf("In MMC ready\n");
MMC=1;
goto RECMD2;
}
Uart_Printf("MMC check end!!\n");
//-- Check SD card OCR
if(Chk_SD_OCR())
Uart_Printf("In SD ready\n");
else
{
Uart_Printf("Initialize fail\nNo Card assertion\n");
return 0;
}
RECMD2:
//-- Check attaced cards, it makes card identification state
rSDICARG=0x0; // CMD2(stuff bit)
rSDICCON=(0x1<<10)|(0x1<<9)|(0x1<<8)|0x42; //lng_resp, wait_resp, start, CMD2
//-- Check end of CMD2
if(!Chk_CMDend(2, 1))
goto RECMD2;
rSDICSTA=0xa00; // Clear cmd_end(with rsp)
Uart_Printf("End id\n");
RECMD3:
//--Send RCA
rSDICARG=MMC<<16; // CMD3(MMC:Set RCA, SD:Ask RCA-->SBZ)
rSDICCON=(0x1<<9)|(0x1<<8)|0x43; // sht_resp, wait_resp, start, CMD3
//-- Check end of CMD3
if(!Chk_CMDend(3, 1))
goto RECMD3;
rSDICSTA=0xa00; // Clear cmd_end(with rsp)
//--Publish RCA
if(MMC) {
RCA=1;
rSDIPRE=(PCLK/MMCCLK)-1;
Uart_Printf("MMC Frequency is %dHz\n",(PCLK/(rSDIPRE+1)));
}
else
{
RCA=( rSDIRSP0 & 0xffff0000 )>>16;
Uart_Printf("RCA=0x%x\n",RCA);
rSDIPRE=PCLK/(SDCLK)-1; // Normal clock=25MHz
Uart_Printf("SD Frequency is %dHz\n",(PCLK/(rSDIPRE+1)));
} //--State(stand-by) check
if( rSDIRSP0 & 0x1e00!=0x600 ) // CURRENT_STATE check
goto RECMD3;
Uart_Printf("In stand-by\n");
Card_sel_desel(1); // Select
if(!MMC)
Set_4bit_bus();
else
Set_1bit_bus();
return 1;
}
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 enable
SDIFSTA=SDIFSTA|(1<<16); //YH 040223 FIFO reset
SDIBSIZE=0x200; // 512byte(128word)
SDIDTIMER=0x7fffff; // Set timeout count
for(i=0;i<0x1000;i++); // Wait 74SDCLK for MMC card
CMD0();
//Uart_Printf("In idle\n");
//-- Check SD card OCR
if(!Chk_SD_OCR())
{
// fail
GPBDAT = (~(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LED1
do
{
//-- Check attaced cards, it makes card identification state
SDICARG = 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 RCA
SDICARG = 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 CMD3
if (!Chk_CMDend(3, 1))
continue;
SDICSTA = 0xa00; // Clear cmd_end(with rsp)
//--Publish RCA
RCA = (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) check
if (SDIRSP0 & 0x1e00 != 0x600) // CURRENT_STATE check
continue;
} while (0);
//Uart_Printf("In stand-by\n");
Card_sel_desel(1); // Select
Set_4bit_bus();
return 1;
}
