Hai all,
I’m a beginner for ARM.we are planning to write a data on SD card.could u please tell me the procedure and documents for that.I’m using MCB2140.
Thanks
Naz
[http://www.keil.com/arm/rl-arm/rl-flash.asp](http://www.keil.com/arm/rl-arm/rl-flash.asp)naz:
Hai all,I’m a beginner for ARM.we are planning to write a data on SD card.could u please tell me the procedure and documents for that.I’m using MCB2140.
Thank you for reply.
http://www.keil.com/download/list/rl-arm.htm
in this link some demo software is there for SD card ,shall i use it on MCB2140.
i’m getting confused about sd card,any one can please tell which is the correct way to do my work.currently i did spi initialization only.
#define clk 0x00000800;//p0.11 timer capture
void spi_sd_init(void);
int main()
{
spi_sd_init();
}
void spi_sd_init()
{
IODIR0=clk;/*direction-11th pin out on PINSEL0 */
IOSET0=clk;/output set-11th pin out on PINSEL0/
PINSEL1=0x000000A8;/enable SCK,MISO,MOSI/
SSPCR0=0x0007;/8bit data transfer/
SSPCR1=0x02;/ssp enable/
SSPCPSR=0x02;/clock pre scale =here we enable 2/
PINSEL1|=clk;/SSEL enable/
}
next what i have to do.Actually my objective is i have read data from SD card and write data to SD card.we are using MCB2140(LPC2148) board and Transcen 1gb SD card.
Thanks
Naz
I suggest doing your work forward. It never seems to work well when doing it in reverse.
Next you have to read the document that raedbenz referred you to:naz:
currently i did spi initialization only.…
next what i have to do.
cfb,
i tried that code,but nothing happened,means i downloaded the hex file to LPC2148,then sd card doesn’t detected.
You will find everything here http://www.siwawi.arubi.uni-kl.de/avr_p … index.html 
Angelo
Thanks for the kindful reply.i want to initialise the SD card.means first i want to see either my sd card is present or not.
#include<LPC214x.h>
#include<stdio.h>
#define cmd_size 5
#define clk 0x00000800;//p0.11 timer capture
#define IN_IDLE_STATE (1<<0) /waking from idle stage/
void spi_sd_init(void);
unsigned char sd_init(void);
unsigned char spi_tx_ready(unsigned char);
void spi_send(void);
void spi_send1(void);
unsigned char sd_response(unsigned char);
unsigned char sd_init_cmd={0x40,0x00,0x00,0x00,0x00,0x95};//reset commands
unsigned char sd_out_idle= {0x45, 0x00,0x00,0x00,0x00, 0xFF}; //bring out from idel state
long int i;
int main()
{
spi_sd_init();
sd_init();
}
void spi_sd_init()
{
IODIR0=clk;/*direction-11th pin out on PINSEL0 */
IOSET0=clk;/output set-11th pin out on PINSEL0/
PINSEL1=0x000000A8;/enable SCK,MISO,MOSI/
SSPCR0=0x0007;/8bit data transfer/
SSPCR1=0x02;/ssp enable/
SSPCPSR=0x02;/clock pre scale =here we enable 2/
PINSEL1|=clk;/SSEL enable/
}
unsigned char sd_init(void)
{
int i;
long int count =0xFF;
IOSET0=clk;//unselect slave
for(i=0;i<10;i++)
spi_tx_ready(0xFF);/check tx reg/
IOCLR0=clk; //select slave
spi_send();/send sd_init commmands/
if( sd_response(IN_IDLE_STATE))
{
IOSET0=clk;
return (1);
}
IOSET0=clk;//unselect slave
spi_tx_ready(0xFF); //send dummy clock
IOCLR0=clk; //select slave
i=255;//for repeating process
do
{
spi_send1();//send commands for bring out from idle stage
}while((spi_tx_ready(0x00)) && --count);
if(!count)
{
IOSET0=clk;
return 2;
}
spi_tx_ready(0xFF); //send dummy clock
IOCLR0=clk; //select slave
return 1;
}
/check tx reg/
unsigned char spi_tx_ready(unsigned char ch)
{
unsigned char ch1;
while((SSPSR & 0x02)!=1); /wait until TNF full/
SSPDR=ch;
while((SSPSR & 0x10)!=0); /wait until busy bit o/
ch1=SSPDR;
return ch1;
}
void spi_send(void)
{
int i;
for(i=0;i<cmd_size;i++)
spi_tx_ready(sd_init_cmd_); /send the sd commands/_
}
void spi_send1(void)
{
int j;
- for(j=0;j<cmd_size;j++)*
- spi_tx_ready(sd_out_idle[j]);*
}
unsigned char sd_response(unsigned char ch)
{
long int count =0xFF;
while((spi_tx_ready(0xFF)!=ch) && --count);/254 !=1 && 254-this loop will execute upto 255 time/
return (1);
}
hai all,
i think my code is correct,but it doesn’t work.i think we have to add starup and retarget file…is it?
naz:
hai all,i think my code is correct,but it doesn’t work.i think we have to add starup and retarget file…is it?
This is a funny statement. It doesn’t work, so you KNOW it isn’t correct. :shock:
hello all,
i’m using keil evaulation version.is it enough to develop Sd card application,or i have to buy licenesed versiong software.
The limitations of the evaluation version are described here:naz:
i’m using keil evaulation version.is it enough to develop Sd card application,or i have to buy licenesed versiong software.
http://www.keil.com/demo/limits.asp
If your application is not doing much besides accessing the SD card, you are only planning to use it for a few months and it’s not a commercial product it might be sufficient for your use.