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pic12f675 with max7221!!!!!

 
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nicenoise



Joined: 10 May 2004
Posts: 17
Location: barcelona

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pic12f675 with max7221!!!!!
PostPosted: Wed Oct 26, 2005 3:01 pm     Reply with quote
hello,

i'm trying to connect a pic12f675 with a max7221 led driver.
Exactly i'm using the "b32cdm module" but this is a max7221 with a led matrix of 64 leds in 8x8 distribution. This is my code and the library. I try with version of compiler v3.212 and 3.190 with the same result. I use the internal clock of the pic and the pins A0,A1 and A4 to control the display.


Code:

#include <12F675.h>
#fuses XT,NOWDT,NOPROTECT,NOMCLR,NOBROWNOUT,INTRC_IO
#use delay(clock=4000000)

#ROM 0x3ff = {0x349C}
#byte ADCON0 = 0x1f
#byte ADRESL = 0x9E
#byte CMCON  = 0X19
#byte ANSEL  = 0x9F

#include "max7219.c"


main()
{

   int i,j;


   CMCON = 0x07; // apaga los comparadores
   ANSEL = 0x00; // GPIO pins en modo digital

   setup_comparator(NC_NC_NC_NC);
   setup_adc_ports(NO_ANALOGS);
   setup_timer_1(T1_DISABLED);

   output_low(CLK);
   delay_us(1);
   output_high(LOAD);

   display_init();      // Inicializa el display

   while(TRUE)
   {

      for(i=1;i<=8;i++){
         for(j=0;j<=9;j++){
         display(i,j);
         delay_ms(200);
         }
      }

   }
}




and this is the library "max7219.c"


Code:



#define     DATA       PIN_A0
#define     LOAD       PIN_A1
#define     CLK         PIN_A4


void display(char adresse,char wert)
{
 char x;
 output_low(LOAD);

 for (x=0;x<4;x++)
 {
  output_low(DATA);  // METE 4 CEROS EN DATA, 4 PRIMEROS BITS
  output_high(CLK);
  delay_us(1);
  output_low(CLK);
  delay_us(1);
 }

 for (x=4;x>0;x--)
 {
  if (bit_test(adresse,x-1)) output_high(DATA);
  else output_low(DATA);
  output_high(CLK);
  delay_us(1);
  output_low(CLK);
  delay_us(1);
 }

 for (x=8;x>0;x--)
 {
  if (bit_test(wert,x-1)) output_high(DATA);
  else output_low(DATA);
  output_high(CLK);
  delay_us(1);
  output_low(CLK);
  delay_us(1);
 }

 output_high(LOAD);
}


void display_init()
{

 display(0x0B,0x07);  // scan limit - 8 columnas
 display(0x0C,0x01);  // Shutdown - normal mode
 display(0x09,0x00);  // decode mode = 0
 display(0x0A,0x07);  // intensity
 //display(0x0F,0x00);  // test

}




I think is ok...
Any sugestions???


Thanks
Alex
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Oct 26, 2005 4:14 pm     Reply with quote
Quote:
I think is ok...
Any sugestions???

Are you searching for sample code to compare to your code ?
Someone objected to me telling them to use Google, but I did
anyway, searching for: MAX7221 int #define

Here's a sample driver:
http://seniord.ee.iastate.edu/dec0212/code/max7221.h

Here's their project page.
http://seniord.ee.iastate.edu/dec0212/final.report/

One other comment. You've got both XT and INTRC_IO fuses.
If you want to use the internal oscillator, get rid of the XT fuse.
#fuses XT,NOWDT,NOPROTECT,NOMCLR,NOBROWNOUT,INTRC_IO
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