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pic18f45k22 and MMC SD

 
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adalucio



Joined: 16 Mar 2009
Posts: 29

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pic18f45k22 and MMC SD
PostPosted: Fri Apr 22, 2011 2:54 am     Reply with quote
Hi all.
I want to test reading/writing on a SD Card (tried 16MB and 1GB) with a pic18f45k22 running at 3,3v. I'm using pulldown and pullup resistors (http://2.bp.blogspot.com/_meF1KpGU79k/S_csFZP7s6I/AAAAAAAAAUM/0mM7eLn7uWg/s1600/PIC18F2550+WAV+Player.jpg).

The pic stop working on write command.


This is my code
Code:

#include <main.h>

#use fast_io(D)
#define MMCSD_PIN_SCL     PIN_D0 //o
#define MMCSD_PIN_SDI     PIN_D4 //i
#define MMCSD_PIN_SDO     PIN_D1 //o
#define MMCSD_PIN_SELECT  PIN_D6 //o
#include <mmcsd.c>

#define LED1   PIN_A0
#define LED2   PIN_A1
#define DELAY  500

void main()
{
   BYTE value = 0x01010101;
   BYTE valuer;
   int32 address = 0x00000000;

   setup_timer_4(T4_DISABLED,0,1); 
   
   if(mmcsd_init())
   {
      while(true)
      {
         output_high(LED1);
         delay_ms(DELAY);
         output_low(LED1);
         delay_ms(DELAY);
      }
   }
   
   output_high(LED1);
   delay_ms(DELAY);
   output_low(LED1);
   
   // Scrivo un dato
   mmcsd_write_byte(address, value);
   mmcsd_flush_buffer();
   
   output_high(LED1);
   delay_ms(DELAY);
   output_low(LED1);
   
   // leggo il dato scritto
   mmcsd_read_byte(address, &valuer);
   
   output_high(LED1);
   delay_ms(DELAY);
   output_low(LED1);
   
   if(value != valuer)
   {
      while(true)
      {
         output_high(LED2);
         delay_ms(DELAY);
         output_low(LED2);
         delay_ms(DELAY);
      }
   }
   
   output_high(LED1);
   output_high(LED2);
   
   while(true);
}


Thanks
collink



Joined: 08 Jan 2010
Posts: 137
Location: Michigan

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PostPosted: Fri Apr 22, 2011 5:29 am     Reply with quote
It seems like some of your pins are configured oddly. SDI should be PIN_D1 and SDO should be PIN_D4 not the other way around like you have it. The usual hardware select pin for SPI2 is PIN_D3 but I suppose you are allowed to use anything you want. Just make sure you actually have your select line run to PIN_D6 like you claim.

Also, does the mmcsd_init() function set up the SPI parameters? Because you otherwise don't seem to be doing that.
adalucio



Joined: 16 Mar 2009
Posts: 29

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PostPosted: Fri Apr 22, 2011 5:57 am     Reply with quote
THANKS!!!!

the problem was PIN_D1 and PIN_D4.
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