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nicenoise
Joined: 10 May 2004 Posts: 17 Location: barcelona
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pic12f675 with max7221!!!!! |
Posted: Wed Oct 26, 2005 3:01 pm |
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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);
}
}
}
}
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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
}
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I think is ok...
Any sugestions???
Thanks
Alex |
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PCM programmer
Joined: 06 Sep 2003 Posts: 21708
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Posted: Wed Oct 26, 2005 4:14 pm |
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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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