sevenseg.c

Seven segment library for ATmega16 MCU.

#include <avr/io.h>
#include <avr/interrupt.h>
#include "font.h"
#include "config.h"
#include "scheduler.h"

volatile unsigned char ddata[8];
volatile unsigned char sdisp = 0;
volatile unsigned char putCharPos = 0;
taskid_t sevenseg;

void SevenSegRefresh(void)
{
    sdisp++;
    DISP_PORT_SEG = 0;
    DISP_PORT_DISP = (1<<(sdisp & 7));
    DISP_PORT_SEG = ddata[(sdisp & 7)];
}

void SevenSegInit(void)
{
    DISP_DDR_DISP = 0xFF;
    DISP_DDR_SEG = 0xFF;
    sevenseg = setInterval(SevenSegRefresh,120);
}


void SevenSegPutChar(char c)
{
    if (c=='\n')
    {
        putCharPos = 0;
    }
    else
    {
        ddata[putCharPos] = chars[(unsigned short int)c];
        putCharPos = (putCharPos<7)?putCharPos+1:0;
    }    
}

void SevenSegPutStr(char * str)
{
    while (*str)
        SevenSegPutChar(*str++);    
}

void SevenSegPutStrHex(unsigned int num, int len)
{
	char str[9];
	char *ptr = str + 8;

	*ptr = '\0';
	while (len) {
		ptr --;
		len --;
		if ((num & 0xF) >= 10)
			*ptr = 'A' + (num & 0xF) - 10;
		else
			*ptr = '0' + (num & 0xF);
		num >>= 4;
	}
	SevenSegPutStr(ptr);
}

void SevenSegPutStrDec(unsigned int num, int len)
{
	unsigned int i,j,temp;
	char digit;
	
	for(i=len;i>=1;i--)
	{
		temp=1;
		for(j=1;j<=i-1;j++)
			temp *= 10;
			
		digit='0';
		while (num>=temp)
		{
			num -=temp; digit++;
		}
		SevenSegPutChar(digit);
	}
}