Lpc2000

--- In lpc2000@yahoogroups.com, "armqamp" <wouter@w...> wrote:
>
> Hello,
> 
> I'm trying to make an SD card to work with the lpc2106 and later want
> to implement FAT.
> The problem is I don't get any response of the SD card when I try to
> initialize it.
> 
> Maybe somebody can disover what I'm doing wrong?
> 
> here is the code:
> 
> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
> 
> void ActivateSD(void){
> 	
> 	unsigned int ii=0;
> 	unsigned char resp, i;
> 	unsigned char status;
> 	
> 	print("Activating SD Card....\n\n");
> 
> 	// Turn off SD Card
> 	SD_power_off;
> 
> 	// Wait for power to really go down
> 	for(ii = 0; ii; ii++);
> 	for(ii = 0; ii; ii++);
> 	for(ii = 0; ii; ii++);
> 	for(ii = 0; ii; ii++);
> 
> 	// Turn on SD Card
> 	SD_power_on;
> 
> 	// Wait for power to really come up
> 	for(status = 0; status < 10; ++status)
> 	{
> 		for(ii = 0; ii; ii++);
> 		for(ii = 0; ii; ii++);
> 		for(ii = 0; ii; ii++);
> 		for(ii = 0; ii; ii++);
> 	}
> 	
> 	
> 	
> 	
> 	
> 	for(i=1; i<=10; i++){	                //try 10 times to wake up the card
> 		
> 		SD_disable;			//CS high
> 		
> 		InitSequence();			//send 80 clocks
> 		
> 		SD_enable;			//CS low
> 		
> 		SD_SendCommand(CMD0,0,0,0,0); //send Reset command
> 		
> 		resp = SD_Response();
> 		if( resp == 0x01 ){          //wait for R1 response to be 0x01
> 			break;
> 		}
> 		else{
> 		
> 		}
> 		
> 	}
> 	
> 	spiSendByte(0xFF);		   // Response received, send the required 8
> clocks after the response to finish up (page 5-6 Sandisk Manual)
> 
> 	
> 	if(i>10){
> 		SD_disable;
> 		print("SD activation failed\n");
> 	}
> 	else{
> 		print("SD activation successfully\n");
> 		
> 		while( resp != 0x00){	                 //try sending CMD1 until
> response R1 is 0x00
> 			SD_SendCommand(CMD1,0,0,0,0);	 //activate card initialization process
> 			resp = SD_Response();
> 			spiSendByte(0xFF);	         //send required 8 clocks
> 			if(resp==0x00){		         // Ready
> 				print("SD successfully activated!!!\n");
> 				break;
> 			}
> 		}
> 		
> 		if(resp != 0x00){
> 			print("Error: ");
> 			print("0x"); printnum(16, 8, 0, '0', resp); print("\n");
> 		}
> 		
> 	}
> 	print("\n-------end-----------\n");
> }
> 
> 
> unsigned char SD_Response(void) {
> 	unsigned char 	i;
> 	unsigned char 	resp;	
> 	
> 	for(i=0; i<10; i++) {
> 		resp = spiGetByte();
> 		if(resp != 0xFF) {
> 			return resp;
> 		}
> 	}		
> 	return 0xFF;
> }
> 
> void SD_SendCommand(unsigned char command, unsigned char arg_a,
> unsigned char arg_b, unsigned char arg_c, unsigned char arg_d) {	
> 	spiSendByte(command);
> 	spiSendByte(arg_a);
> 	spiSendByte(arg_b);
> 	spiSendByte(arg_c);
> 	spiSendByte(arg_d);
> 	spiSendByte(0x95);				// correct CRC for first command in SPI after
> that CRC is ignored, so no problem with always sending 0x95
> }
> 
> @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
>

First, what's the value of "CMD0" ? It must be 0x40.

Cheers, 
 Max.