hssn601
Joined: 31 Jan 2014
Posts: 20
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| SDHC driver for CCS **free** |
 Posted: Tue Jun 10, 2014 4:50 am |
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This code require mmcsd.c for read and write operations.
********
Tested SD cards
2,4,8,16 gb
********
you only have to call InitializeSD() instead of mmcsd_init()
InitializeSD =1 if success
InitializeSD =0 if unsuccessful
after that you can use ccs mmcsd.c with SDHC memory cards.
MySD.c
| Code: |
//Slightly modified SD initialization
MMCSD_err mmcsd_init()
{
//fprintf(SERIAL2,"\r\n---SD-SPI initialization....\r\n");
unsigned int8 i,r1,ra,rb;
g_CRC_enabled = TRUE;
g_mmcsdBufferAddress = 0;
output_drive(MMCSD_PIN_SCL);
output_drive(MMCSD_PIN_SDO);
output_drive(MMCSD_PIN_SELECT);
output_float(MMCSD_PIN_SDI);
//delay_ms(1000);
//spi_xfer(mmcsd_spi, 0x55);
//delay_ms(1000);
//spi_xfer(mmcsd_spi, 0x55);
OUTPUT_HIGH(MMCSD_PIN_SELECT);
spi_xfer(mmcsd_spi, 0xFF);
spi_xfer(mmcsd_spi, 0xFF);
spi_xfer(mmcsd_spi, 0xFF);
spi_xfer(mmcsd_spi, 0xFF);
spi_xfer(mmcsd_spi, 0xFF);
spi_xfer(mmcsd_spi, 0xFF);
spi_xfer(mmcsd_spi, 0xFF);
spi_xfer(mmcsd_spi, 0xFF);
spi_xfer(mmcsd_spi, 0xFF);
spi_xfer(mmcsd_spi, 0xFF);
OUTPUT_LOW(MMCSD_PIN_SELECT);
mmcsd_deselect();
delay_ms(20);
/* begin initialization */
//fprintf(SERIAL2,"\r\nIdle in\r\n");
i = 0;
do
{
mmcsd_select();
r1=mmcsd_go_idle_state();
mmcsd_deselect();
i++;
if(i >= 250)
{
mmcsd_deselect();
return r1;
}
} while(!bit_test(r1, 0));
spi_xfer(mmcsd_spi, 0xFF);
//fprintf(SERIAL2,"Idle out\r\n");
// following initialization is for MMC card only
i = 0;
do
{
delay_ms(20);
mmcsd_select();
//r1=mmcsd_send_op_cond();//for MMC card
ra=mmcsd_app_cmd();
mmcsd_deselect();
//spi_xfer(mmcsd_spi, 0xFF);
delay_us(100);
mmcsd_select();
rb=mmcsd_sd_send_op_cond();
//spi_xfer(mmcsd_spi, 0xFF);
mmcsd_deselect();
i++;
if(i >=250)
{
mmcsd_deselect();
return r1;
}
} while((ra | rb) & MMCSD_IDLE);
/* figure out if we have an SD or MMC */
// mmcsd_select();
// r1=mmcsd_app_cmd();
// r1=mmcsd_sd_send_op_cond();
// mmcsd_deselect();
/* an mmc will return an 0x04 here */
/*if(r1 == 0x04)
g_card_type = MMC;
else
g_card_type = SD;
// set block length to 512 bytes
printf("Card Type: %X\r\n",r1);*/
mmcsd_select();
r1 = mmcsd_set_blocklen(MMCSD_MAX_BLOCK_SIZE);
if(r1 != MMCSD_GOODEC)
{
mmcsd_deselect();
//fprintf(SERIAL2,"Block error EN: %X\r\n",r1);
return r1;
}
mmcsd_deselect();
//fprintf(SERIAL2,"Return from block EN: %X\r\n",r1);
/* turn CRCs off to speed up reading/writing */
mmcsd_select();
r1 = mmcsd_crc_on_off(0);//sharry: changed from 0 to 1
if(r1 != MMCSD_GOODEC)
{
mmcsd_deselect();
//return r1;//for proteus simulation only
//fprintf(SERIAL2,"CRC error on/off: %X\r\n",r1);
}
mmcsd_deselect();
//fprintf(SERIAL2,"Return from CRC OFF: %X\r\n",r1);
//r1=0;
r1 = mmcsd_load_buffer();
//fprintf(SERIAL2,"\r\n---SD successfully initialized...\r\n");
//delay_ms(2000);
return r1;
}
//SDHC Initialization
#use spi(FORCE_HW, MASTER, DI = MMCSD_PIN_SDI, DO = MMCSD_PIN_SDO, CLK = MMCSD_PIN_SCL, BITS = 8, MSB_FIRST, MODE = 0, stream = mmcsd_spi, CLOCK_HIGH = 1, CLOCK_LOW = 1)
unsigned int8 sd_cmd1[9] = {
0xFF, 0x40, 0x00, 0x00, 0x00, 0x00, 0x95, 0xFF, 0xFF
};
unsigned int8 sd_cmd2[13] = {
0xFF, 0x48, 0x00, 0x00, 0x01, 0xAA, 0x87, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
};
unsigned int8 sd_cmd3[8] = {
0xFF, 0x77, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF
};
unsigned int8 sd_cmd4[9] = {
0xFF, 0x69, 0x40, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF
};
unsigned int8 sd_cmd5[10] = {
0xFF, 0x7A, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF
};
unsigned int8 send_spi(unsigned int8 spi_msg) {
static unsigned int8 spi_rcv;
spi_rcv = spi_xfer(mmcsd_spi, spi_msg);
return spi_rcv;
}
unsigned int8 Send_Command(unsigned int8 cmd[], unsigned int8 size) {
static unsigned int8 p;
static unsigned int8 resp;
delay_us(20);
//mmcsd_select();
for (p = 0; p < size; p++) {
resp = send_spi(cmd[p]);
}
//mmcsd_deselect();
return resp;
}
void Initialize(void) {
output_drive(MMCSD_PIN_SCL);
output_drive(MMCSD_PIN_SDO);
output_drive(MMCSD_PIN_SELECT);
output_float(MMCSD_PIN_SDI);
OUTPUT_HIGH(MMCSD_PIN_SELECT);
spi_xfer(mmcsd_spi, 0xFF);
spi_xfer(mmcsd_spi, 0xFF);
spi_xfer(mmcsd_spi, 0xFF);
spi_xfer(mmcsd_spi, 0xFF);
spi_xfer(mmcsd_spi, 0xFF);
spi_xfer(mmcsd_spi, 0xFF);
spi_xfer(mmcsd_spi, 0xFF);
spi_xfer(mmcsd_spi, 0xFF);
spi_xfer(mmcsd_spi, 0xFF);
spi_xfer(mmcsd_spi, 0xFF);
OUTPUT_LOW(MMCSD_PIN_SELECT);
mmcsd_deselect();
delay_us(50);
}
int1 Initialize_SDHC(void) {
int1 done = 0;
static unsigned int8 rcv;
static unsigned int16 count = 0;
//Send Dummys
Initialize();
mmcsd_select();
Send_Command(sd_cmd1, 9);
mmcsd_deselect();
mmcsd_select();
Send_Command(sd_cmd2, 13);
mmcsd_deselect();
while (!done) {
mmcsd_select();
rcv = Send_Command(sd_cmd3, 8);
if (rcv == 0x00) {
done = 1;
} else {
mmcsd_deselect();
}
mmcsd_select();
rcv = Send_Command(sd_cmd4, 9);
if (rcv == 0x00) {
done = 1;
} else {
mmcsd_deselect();
}
count++;
if (count == 5000) {
return 0;
}
}
mmcsd_select();
if (Send_Command(sd_cmd5, 10) == 0xC0) {
send_spi(0xFF);
send_spi(0xFF);
send_spi(0xFF);
send_spi(0xFF);
return 1;
} else {
return 0;
mmcsd_deselect();
}
}
/*********************
Function: InitializeSD()
Return 1 if sucess
Return 0 if unsucessful
**********************/
int1 InitializeSD(void) {
if (Initialize_SDHC()) {
return 1;
} else if (!mmcsd_init()) {
return 1;
} else {
return 0;
}
}
|
no more searching for 2gb SD cards 
_________________
Best Regards,
Hassan Shakeel |
|
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