Lpc2000

Hi Gus,
   Actually setting S0SPCCR = 8 makes SPI clock rate = 1.875 MHz 
(Xtal=12 MHz, PLL MSEL=5 PSEL=2, VPBDIV=2). Can you let me know 
which speed will be fine with mini SD memory card? At present I am 
working with 0.5 MHz.

S0SPCR=0x30 makes CPOL=1 which is not working in my case. With this 
I am getting Response of CMD0 as 0x00. With CPOL=0, setting 
S0SPCR=0x20, the response byte of CMD0=0x01. Which indicates card in 
Idle State and is expected.

One more help.. After Initializing in SPI Mode through CMD0 what 
would be the command sequence for reading CID register or performing 
any Read/Write operation? Also is it required to pull-up MOSI and 
MISO lines?

In one Forum at Microchip, I saw it is recommended to pad oxFF 
before and after CMD0 command. Now CMDO is 0xFF 0x40 0x00 0x00 0x00 
0x00 0x95 0xFF. I tried it and it is giving response 0x01.

Please help me in understanding these problems and rectifying them.

regards,
Sunil


--- In lpc2000@yahoogroups.com, "Gus" <gus_is_working@y...> wrote:
> change these in your code
> 
> S0SPCCR=8;
> S0SPCR=0x30;
> 
> Make sure the hardware CS pin of SPI is connected to VCC
> 
> look at the schematics on our website
> 
> www.ghielectronics.com
> 
> Gus
>   
> --- In lpc2000@yahoogroups.com, "Sunil Jha" <jha0574@y...> wrote:
> > Hi Atanas,
> >    I am trying to initialize my Mini SD memory card in SPI mode 
> > using LPC2129, but after lots of effort not able to do so. The 
SPI 
> > bus is working with another SPI IC, i have tested it before 
> > connecting to memory. I have incorporated corrections - Pull 
SSEL 
> to 
> > high and use another GPIO as SSEL.Every time i am getting 
response 
> > 0xFF from memory. Below is my code:
> > -----------------------------------------------------------------
--
> --
> > void init_SPI0 (void)
> > {
> > 	PINSEL0 		|= 	0x00005500;		
> > 	//Enable SPI0 pins
> > 	IODIR0 			|= 	0x00000001;		
> > 	//Enable Chipselect pin as output
> > 	
> > 	S0SPCCR			=	0x0000001E;		
> > 	//Set bit timing  PCLK/30
> > 	S0SPCR   		=	0x000000A0;		
> > 	//Configure as SPI Master interrupts enabled
> > 
> > 	IOSET0 	|= 	CS;		//Pull Chipselect high
> > 	
> > }
> > 
> > void init_memory(void)
> > {
> > 	unsigned char txstatus, byteread;
> > 
> >         IOCLR0 	|= 	CS;		//Pull Chipselect low
> > 	
> > 	S0SPDR = 0x40;
> > 	while (!(S0SPSR & 0x80)) 
> > 		putchar('+');
> > 	txstatus = S0SPSR;
> > 	S0SPDR;
> > 	sprintf(str,"Transmit Status 0x40 %x\n",txstatus);
> > 	putstr(str);
> > 
> > 	S0SPDR = 0x00;
> > 	while (!(S0SPSR & 0x80)) 
> > 		putchar('+');
> > 	txstatus = S0SPSR;
> > 	S0SPDR;
> > 	sprintf(str,"Transmit Status 0x00 %x\n",txstatus);
> > 	putstr(str);
> > 
> > 	S0SPDR = 0x00;
> > 	while (!(S0SPSR & 0x80)) 
> > 		putchar('+');
> > 	txstatus = S0SPSR;
> > 	S0SPDR;
> > 	sprintf(str,"Transmit Status 0x00 %x\n",txstatus);
> > 	putstr(str);
> > 
> > 	S0SPDR = 0x00;
> > 	while (!(S0SPSR & 0x80)) 
> > 		putchar('+');
> > 	txstatus = S0SPSR;
> > 	S0SPDR;
> > 	sprintf(str,"Transmit Status 0x00 %x\n",txstatus);
> > 	putstr(str);
> > 
> > 	S0SPDR = 0x00;
> > 	while (!(S0SPSR & 0x80)) 
> > 		putchar('+');
> > 	txstatus = S0SPSR;
> > 	S0SPDR;
> > 	sprintf(str,"Transmit Status 0x00 %x\n",txstatus);
> > 	putstr(str);
> > 
> > 	S0SPDR = 0x95;
> > 	while (!(S0SPSR & 0x80)) 
> > 		putchar('+');
> > 	txstatus = S0SPSR;
> > 	S0SPDR;
> > 	sprintf(str,"Transmit Status 0x95 %x\n",txstatus);
> > 	putstr(str);
> > 	
> > 	S0SPDR = 0xFF;
> > 	while (!(S0SPSR & 0x80)) 
> > 		putchar('.');;
> > 	txstatus = S0SPSR;
> > 	byteread = S0SPDR;
> > 	sprintf(str,"Byte Read %x\n",byteread);
> > 	putstr(str);
> > }
> > -----------------------------------------------------------------
> > 
> > If you have acheived this can you please help me in getting my 
> card 
> > initialized for SPI mode?
> > 
> > regards,
> > Sunil
> > 
> > --- In lpc2000@yahoogroups.com, "Atanas Tulbenski" <top4e@y...> 
> > wrote:
> > > 
> > >  I'm using SD card with LPC2124. At first I used software SPI 
> and 
> > > everything was fine. When I start using hardware SPI got 
> problem. 
> > The 
> > > SD card initializes, I can read serial numbers, but I cant 
read 
> > data 
> > > using CMD17. The card returns error code 0x04 "ilegal 
command". 
> > Any 
> > > sugestions?