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mmc spi driver example

 
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jaime



Joined: 25 Nov 2005
Posts: 56
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mmc spi driver example
PostPosted: Fri Aug 04, 2006 7:41 am     Reply with quote
Hi

can anyone post and example using the ccs driver "mmc spi"?

I would like to make a data logger with this driver but i dont now where to start...

thanks

jaime
ckielstra



Joined: 18 Mar 2004
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PostPosted: Mon Aug 07, 2006 4:23 am     Reply with quote
From the absence of response you get it looks like no example code exists or nobody is willing to share it.

Can you be a bit more specific of what your problem is? I had a look at the CCS provided code and it looks easy to use. There are init, read and write functions, what more information do you need?
jaime



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PostPosted: Mon Aug 07, 2006 12:01 pm     Reply with quote
Thanks for the support...
The mmc dont init...

Code:

#include<18F4550>
#use delay (clock=20000000)
#use rs232(baud=19200, xmit=pin_c6, rcv=pin_c7)
#fuses HS, NOLVP, NOWDT, PUT, BROWNOUT
#include <mmc_spi.c>

#define MMC_CS    PIN_D0
#define MMC_CLK   PIN_D1
#define MMC_DI    PIN_D2
#define MMC_DO    PIN_D3

main()
{
printf("\n\rTeste MMC drivers\n\r");

if(mmc_init()==0)
   printf("\n\rmmc init ok\n\r");
else
   printf("\n\rmmc init fault\n\r");
}


This is the beginning of the program. I enable the debug messsges in the driver. I get 50 times
Code:

 sent cmd 0, arg 0
 err: no start bit waiting for response

and then
Code:


 ERR: after reset, device isn't idle
mmc init fault


what shloud i do? I try the same card with the program that PCM translate from cc5x and it woks. I only change the PIC and the pins for the connections.

Thanks
slo
Guest
PostPosted: Mon Aug 07, 2006 3:53 pm     Reply with quote
I don't have the CCS mmc_spi code as my compiler is too old so I can't check, but if you're #defines for the MMC pins are declared after the #include for the mmc_spi.c, then the mmc_spi.c will be compiled first, using it's default pins.
Try defining the mmc pins before the include for the mmc_spi.
jaime



Joined: 25 Nov 2005
Posts: 56
Location: Porto - Portugal

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PostPosted: Tue Aug 08, 2006 7:11 am     Reply with quote
Yes... it works. Thanks

I make a litle program that after init will record serial data and when reach 512 bytes will write the mmc and then read back.
But i'm doing something wrong...

Code:

#include<18F4550>

#use delay (clock=20000000)
#use rs232(baud=19200, xmit=pin_c6, rcv=pin_c7)

#fuses HS, NOLVP, NOWDT, PUT, BROWNOUT

#define MMC_CS    PIN_D0
#define MMC_CLK   PIN_D1
#define MMC_DI    PIN_D2
#define MMC_DO    PIN_D3

#include <mmc_spi.c>

char buffer[513];
char send[513];
int16 size=0;
int32 address=0;

main()
{

printf("\n\rTeste MMC drivers\n\r");

if(mmc_init()==0)
   printf("\n\rmmc init ok\n\r");
else
   printf("\n\rmmc init fault\n\r");

enable_interrupts(int_rda);
enable_interrupts(global);

printf("\n\rStart...\n\r");

while(1)
   {
   //starts to record the serial data and when have 512 bytes records it
   if(size==512)
      {
      disable_interrupts(int_rda);

      printf("\n\r buffer=%s\n\r",buffer);

      if(mmc_write_block(address, size, *buffer)==0)
         printf("\n\rwrite ok \n\r");
      else
         printf("\n\rwrite fault \n\r");

      //read

      if(mmc_read_block(address, size,*send)==0)
         printf("\n\rread ok\n\r");
      else
         printf("\n\rread fault");

      //prints the data

      printf("\n\rreading: %s\n\r",send);

      size=0;
      address++;

      enable_interrupts(int_rda);
      }
   }
}

#int_rda
void trata_rda()
{
buffer[size]=getc();
size++;
}



The write and read function in mmc spi is like:
MMC_EC mmc_write_block(int32 address, int16 block_size, int *ptr);
MMC_EC mmc_read_block(int32 address,int16 block_size, int *ptr);

Thanks agian
ckielstra



Joined: 18 Mar 2004
Posts: 3680
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PostPosted: Tue Aug 08, 2006 8:16 am     Reply with quote
Change
Code:
      address++;
to
Code:
      address+=512;
jaime



Joined: 25 Nov 2005
Posts: 56
Location: Porto - Portugal

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PostPosted: Tue Aug 08, 2006 9:43 am     Reply with quote
Thanks...

But still have a error in the read function...


Code:
      //read

      if(mmc_read_block(address, size,*send)==0)
         printf("\n\rread ok\n\r");
      else
         printf("\n\rread fault");

      //prints the data

      printf("\n\rreading: %s\n\r",send);


It prints nothing... any help?
jaime



Joined: 25 Nov 2005
Posts: 56
Location: Porto - Portugal

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PostPosted: Wed Aug 09, 2006 10:00 am     Reply with quote
i understand that i have errors... lots and big ones.
i was reading about pointers and passing pointers to functions...
Now i change my program and i have a error that i dont understand. Passing the pointer to another function the value of the pointer change.
I print the value of the pointer and then call the write block fuction, and when i enter the write function i print the value and they dont match...



Code:
#include<18F4550>

#device *=16

#use delay (clock=20000000)
#use rs232(baud=19200, xmit=pin_c6, rcv=pin_c7, errors)

#fuses HS, NOLVP, NOWDT, PUT, BROWNOUT

#define MMC_CS    PIN_D0
#define MMC_CLK   PIN_D1
#define MMC_DI    PIN_D2
#define MMC_DO    PIN_D3

#include <mmc_spi.c>

int buffer[512];
int16 size=0;

main()
{
int32 address=0;
int *ptra;
int16 f;

ptra = &(buffer[0]);

printf("\n\r Teste MMC drivers\n\r");

if(mmc_init()==0)
   printf("\n\rmmc init ok\n\r");
else
   printf("\n\rmmc init fault\n\r");

enable_interrupts(int_rda);
enable_interrupts(global);

printf("\n\rStart...\n\r");

while(1)
   {
//starts to record the serial data and when have 512 bytes records it
   if(size==512)
      {
      disable_interrupts(int_rda);

//prints the buffer
      printf("\n\rWhat enter the buffer:\n\r");
      for(f=0;f<=511;f++)
         printf("%c,",buffer[f]);
         
//prints address of buffer to see if match the pointer         
      printf("\n\r");       
      printf("\n\rBuffer address            = %ld",&(buffer[0]));
      printf("\n\rptra points to              = %ld",ptra);
      printf("\n\r");     

//call the write block function from driver
      if(mmc_write_block(address, size, *ptra)==0)
         printf("\n\rwrite ok \n\r");
      else
         printf("\n\rwrite fault \n\r");

//clear the buffer
      for(f=0;f<=511;f++)
         buffer[f]=0;

//prints address of buffer to see if match the pointer
      printf("\n\r");
      printf("\n\rBuffer address             = %ld",&(buffer[0]));
      printf("\n\rptra points to               = %ld",ptra);
      printf("\n\r");       
     
//call the read block function from driver     
      if(mmc_read_block(address, size,*ptra)==0)
         printf("\n\rread ok\n\r");
      else
         printf("\n\rread fault");

//print the buffer to see if is the same as PIC send           
      printf("\n\r What the PIC receive must be the same as the buffer:\n\r");
      for(f=0;f<=511;f++)
         printf("%c,",buffer[f]);

      size=0;
      address+=512;

      enable_interrupts(int_rda);

      printf("\n\rStart again\n\r");
      }
   }
}

#int_rda
void trata_rda()
{
buffer[size]=getc();
size++;
}


any help?
Ttelmah
Guest
PostPosted: Wed Aug 09, 2006 10:27 am     Reply with quote
Ptra, is _already_ a pointer. You are handing the contents of the pointer to the function, not the pointer itself. With this wrong value, the code overwrites the value held in ptra, and hence scrambles the memory in this area. Use one of:
if(mmc_write_block(address, size, ptra)==0)

if(mmc_write_block(address, size, buffer)==0)
-- (the name of an array, _is_it's address)

if(mmc_write_block(address, size, &buffer[0])==0)

Each of these will give the address of the buffer, which you are currently not doing...

Best Wishes
jaime



Joined: 25 Nov 2005
Posts: 56
Location: Porto - Portugal

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PostPosted: Wed Aug 09, 2006 11:38 am     Reply with quote
thanks a lot... it works.
NIBIRU
Guest
PostPosted: Wed Jun 06, 2007 11:32 am     Reply with quote
Hi, Jaime I have the same problem, what driver are you using? Can you post the final code please. thanks a lot.
mikepic
Guest
PostPosted: Sun Jun 10, 2007 6:07 am     Reply with quote
Hi,

I'm triying to test all this in proteus, but it doesn't work.

Has anybody do it?
jaime



Joined: 25 Nov 2005
Posts: 56
Location: Porto - Portugal

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PostPosted: Wed Jun 13, 2007 11:53 am     Reply with quote
NIBIRU wrote:
Hi, Jaime I have the same problem, what driver are you using? Can you post the final code please. thanks a lot.


Hello

You can see it in my web page...
_________________
www.jagsilva.com
Guest
PostPosted: Thu Jul 12, 2007 1:23 pm     Reply with quote
Hi Jaime,


Your web page is no longer available, do you have a new one?

Thanks,

Joao
jaime



Joined: 25 Nov 2005
Posts: 56
Location: Porto - Portugal

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PostPosted: Thu Jul 12, 2007 1:31 pm     Reply with quote
hello
the link was wrong but the page working.

thanks

jaime
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