lcddec32.c

MSP430 examples or customized

//--------------------------------------------------------------------------
//
//  Software for MSP430 based e-meters.
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//	File: LCDdec32.c
//
//  Steve Underwood <[e-mail]>
//  Texas Instruments Hong Kong Ltd.
//
//  Date        Comments
//  =====================
//	2002-09-16	Initial version
//      2004-05-28      Adopted for FE427 Demo (UPSF)
//
//    Version 1.0 first release for Application Report
//    06/04/04
//
//
//--------------------------------------------------------------------------
#include <stdint.h>
#include "emeter-toolkit.h"
#include "fet4xx_rtclcd.h"

//Display a signed 32 bit integer, with leading zero
//suppression. "after" is the number of digits which are
//after the decimal point. The leading zero suppression
//allows for this.
void LCDdec32(int32_t value, int pos, int digits, int after)
{
	int i;
   	int flag;
   	unsigned int digit;
   	uint8_t bcd[5];

        if (pos > LCD_SIZE) pos = LCD_SIZE;
        if (digits > LCD_SIZE) digits = LCD_SIZE;

	if (value < 0)
	{
		flag = 2;
		value = -value;
	}
	else
	{
		flag = 1;
                Direct2LCD(CHAR_SPACE, digits--);
	}
	bin2bcd32(bcd, value);
        while (digits >= pos)
        {
                  Direct2LCD(CHAR_SPACE, --digits);
        }        
        digits++;

	pos--;
	after = 9 - after;
   	for (i = 10 - digits;  i < 10;  i++)
   	{
   		digit = bcd[i >> 1];
   		if ((i & 1) == 0)
   			digit >>= 4;
   		if ((digit & 0x0F)  ||  i >= after)
   		{
   			if (flag == 2)
	   			Direct2LCD(CHAR_MINUS, pos+1);
   			flag = 0;
   	   	}
              (flag == 0)  ?  BCD2LCD((digit & 0xF),pos)  :  Direct2LCD(CHAR_SPACE, pos);
	      pos--;
  	}
      	after = 5 - after - 1;
        if (after > 0) setPoint(after);
}