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Library for MAX7219 and MAX7221 SPI LED Display Driver IC

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sshahryiar

Joined: 05 May 2010
Posts: 94
Location: Dhaka, Bangladesh

Library for MAX7219 and MAX7221 SPI LED Display Driver IC

Posted: Sat Nov 29, 2014 11:28 am

MAX72xx.h

Code:

#define DIN pin_A1
#define CS pin_A2
#define CLK pin_A4

#define NOP 0x00

#define DIG0 0x01
#define DIG1 0x02
#define DIG2 0x03
#define DIG3 0x04
#define DIG4 0x05
#define DIG5 0x06
#define DIG6 0x07
#define DIG7 0x08

#define decode_mode_reg 0x09
#define intensity_reg    0x0A
#define scan_limit_reg 0x0B
#define shutdown_reg 0x0C
#define display_test_reg 0x0F

#define shutdown_cmd 0x00
#define run_cmd 0x01

#define no_test_cmd 0x00
#define test_cmd 0x01

#define digit_0_only 0x00
#define digit_0_to_1 0x01
#define digit_0_to_2 0x02
#define digit_0_to_3 0x03
#define digit_0_to_4 0x04
#define digit_0_to_5 0x05
#define digit_0_to_6 0x06
#define digit_0_to_7 0x07

#define No_decode_for_all       0x00
#define Code_B_decode_digit_0    0x01
#define Code_B_decode_digit_0_to_3 0x0F
#define Code_B_decode_for_all    0xFF

void MAX72xx_init();
void MAX72xx_write(unsigned char address, unsigned char value);

MAX72xx.c

Code:

#include "MAX72xx.h"

void MAX72xx_init()
{
output_high(CS);
MAX72xx_write(shutdown_reg, run_cmd);
MAX72xx_write(decode_mode_reg, No_decode_for_all);
MAX72xx_write(scan_limit_reg, digit_0_to_7);
MAX72xx_write(intensity_reg, 0x04);
MAX72xx_write(display_test_reg, test_cmd);
delay_ms(100);
MAX72xx_write(display_test_reg, no_test_cmd);
}

void MAX72xx_write(unsigned char address, unsigned char value)
{
unsigned char s = 0;
unsigned long data_word = 0;

data_word = (((unsigned long)address << 8) | value);
output_low(CS);

for(s = 0; s < 16; s += 1)
{
if((data_word & 0x8000) != 0)
{
output_high(DIN);
}
else
{
output_low(DIN);
}
output_low(CLK);
delay_ms(1);
output_high(CLK);
data_word <<= 1;
}
output_high(CS);
}

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SShahryiar

tedibear

Joined: 03 Mar 2015
Posts: 2

gggg
Posted: Tue Mar 03, 2015 2:05 am

Rica etsem örnek bir kod yazmanız mümkün mü? Is it possible to write a sample code please? _________________ Nawaz

sshahryiar

Joined: 05 May 2010
Posts: 94
Location: Dhaka, Bangladesh

Sample code

Posted: Tue Mar 03, 2015 2:37 am

Code:

#include <12F675.h>

#device *=16
#device ADC = 8

#fuses INTRC_IO, PROTECT, CPD, PUT, NOBROWNOUT, NOWDT, NOMCLR

#use delay (internal=4MHz)

#define tilt_switch    !input(pin_A3)

#include <stdlib.h>
#include "MAX72xx.c"

const unsigned char disp[56] =
{

0x00, 0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00,
0xC0, 0xC0, 0x00, 0x00, 0x00, 0x00, 0x03, 0x03,
0xC0, 0xC0, 0x00, 0x18, 0x18, 0x00, 0x03, 0x03,
0xC3, 0xC3, 0x00, 0x00, 0x00, 0x00, 0xC3, 0xC3,
0xC3, 0xC3, 0x00, 0x18, 0x18, 0x00, 0xC3, 0xC3,
0xDB, 0xDB, 0x00, 0x00, 0x00, 0x00, 0xDB, 0xDB,
0x81, 0x42, 0x24, 0x18, 0x18, 0x24, 0x42, 0x81
};

void setup();

void main()
{
unsigned char i = 0;
unsigned long j = 0; ;
unsigned char disp_adj = 0;

setup();

while(TRUE)
{
read_adc(adc_start_only);
   while(!adc_done());
   disp_adj = read_adc(adc_read_only);
   disp_adj >>= 4;
   MAX72xx_write(intensity_reg, disp_adj);

   if(tilt_switch)
   {
      for(i = 0; i < 8; i++)
      {
      MAX72xx_write((i + 1), 0x00);
      }
      while(tilt_switch)
      j = rand();
      j /= 4681;
   }
      else
      {
         for(i = 0; i < 8; i++)
   {
   MAX72xx_write((i + 1), disp[((j << 3) + i)]);
   }
      }
}
}

void setup()
{
disable_interrupts(global);
setup_comparator(NC_NC_NC_NC);
setup_ADC(ADC_clock_internal);
setup_ADC_ports(sAN0);
set_ADC_channel(0);
setup_timer_0(T0_internal);
setup_timer_1(T1_disabled);
set_timer0(0);
set_timer1(0);
MAX72xx_init();
}

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SShahryiar

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