Lpc2000

Peter,

I thought always CMD0 had to be send to reset the card and then CMD1
to activate it.
I haven't seen other guys do it differently too. 
But you are beginnning with ACDM41? and then CMD58?

maybe you can send or post your code so I can compare it?

thanks,

Wouter



--- In lpc2000@yahoogroups.com, Peter Jakacki <peterjak@t...> wrote:
>
> Look under the SPI section in the sandisk manual. I use ACMD41 as this 
> is the recommended method followed by CMD58 to read the OCR. One little 
> thing I do different is to pad the start of a CMD with a couple of
dummy 
> reads (same as writing 0xFF). I have implemented an SD driver and FAT16 
> successfully on the 2106 as well as the 2138 and tested this on about 5 
> different types of SD cards to date.
> 
> BTW, when you power-down the supply just make sure all the SD I/O lines 
> are taken down to VSS as well.
> 
> *Peter*
> 
> 
> armqamp 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
> >}
> >  
> >
>