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Example to drive 5 x 7 Matrix LED
/************************************************
* *
* COPYRIGHT (c) Blitzlogic Sdn. Bhd. *
* Author : Abraham Wong 21/1/2000 *
* *
* example of driving 5 x 7 Matrix LEDs *
* *
* Compiler : KEIL 8051 C - 2K EVAL *
* *
************************************************/
#include < at89C2051.h > /* Include 89C2051 header file here */
char const pat[5]={ 0x3f, 0x02, 0x04, 0x02, 0x3f };
void wait (void)
{ ; /* wait function */
}
void main( void )
{
unsigned char cnt, col;
unsigned int i;
P3 = 0; /* ZERO port_a & port P3 */
P1 = 0;
for( ;; )
{
col = 1;
for (cnt=0;cnt<5;cnt++)
{
for(col = 0;col < 32;col<<=1;)
{
P1 = pat[cnt];
P3 = col;
for (i = 0; i < 10000; i++)
{
wait(); /* delay for half second */
}
}
}
}
}
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