PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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 Posted: Mon Feb 14, 2011 6:35 pm |
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Here's a demo program that I did for a static lcd (i.e., non-multiplexed)
with the 16F917, that displays decimal points. I compiled it with vs. 4.119.
The program shown below displays the following output on the LCD:
It was also tested with the decimal points in two other locations, and it
successfully displayed them:
This code does not use your Mechatronics board LCD. That LCD is not
available for sale by any online retail sales company that I can find.
Therefore, you will have to study this code and modify it to make it work
with your board, PIC, and LCD. I don't really want to do any more work
on this problem.
| Code: |
#include <16F917.H>
#fuses INTRC_IO, NOWDT, BROWNOUT, PUT
#use delay(clock=8000000)
// The LCD digits are numbered in the following way,
// according to the Varitronix VI-422-DP data sheet.
// _ _ _ _
// ^ |_| |_|:|_| |_|
// |_|.|_|.|_|.|_|
// DP4 DP3 DP2
// Digit 4 3 2 1
//
// Note: This lcd is NOT used on the Mechatronics board.
// Only digits 3,2,1 are supported for this demo program
// because the 16F917 only has 24 segment driver pins.
// Digit segments A B C D E F G
// b7 b6 b5 b4 b3 b2 b1
#define DIGIT3 COM0+16, COM0+17, COM0+18, COM0+19, COM0+20, COM0+21, COM0+22
#define DIGIT2 COM0+8, COM0+9, COM0+10, COM0+11, COM0+12, COM0+13, COM0+14
#define DIGIT1 COM0+0 COM0+1, COM0+2, COM0+3, COM0+4, COM0+5, COM0+6
// 0 1 2 3 4 5 6 7 8 9
int8 const Digit_Map[10] = {0xFC,0x60,0xDA,0xF2,0x66,0xB6,0xBE,0xE0,0xFE,0xE6};
#define BLANK 0 // For a blank digit, don't turn on any segments.
#byte LCDDATA0 = 0x110
#byte LCDDATA1 = 0x111
#byte LCDDATA2 = 0x112
// These functions allow you to turn each decimal point On/Off.
#define display_DP2(x) x ? bit_set(LCDDATA0, 7) : bit_clear(LCDDATA0, 7)
#define display_DP3(x) x ? bit_set(LCDDATA1, 7) : bit_clear(LCDDATA1, 7)
#define display_DP4(x) x ? bit_set(LCDDATA2, 7) : bit_clear(LCDDATA2, 7)
int8 lcd_pos = 1;
//-----------------------------------------------
// This function was revised to add decimal points.
void lcd_putc(char c)
{
int8 segments;
if(c == '\f')
{
lcd_pos = 1;
return;
}
if(c == '.')
{
switch(lcd_pos)
{
case 1:
display_DP4(TRUE);
display_DP3(FALSE);
display_DP2(FALSE);
break;
case 2:
display_DP4(FALSE);
display_DP3(TRUE);
display_DP2(FALSE);
break;
case 3:
display_DP4(FALSE);
display_DP3(FALSE);
display_DP2(TRUE);
break;
}
}
if(isamong(c, " 0123456789"))
{
if(c == ' ')
segments = BLANK;
else
segments = Digit_Map[c - '0'];
switch(lcd_pos)
{
case 1: lcd_symbol(segments, DIGIT3); break; // 100's digit
case 2: lcd_symbol(segments, DIGIT2); break; // 10's digit
case 3: lcd_symbol(segments, DIGIT1); break; // 1's digit
}
lcd_pos++;
}
}
//---------------------------
void clear_lcd(void)
{
LCDDATA0 = 0;
LCDDATA1 = 0;
LCDDATA2 = 0;
}
//===================================
void main()
{
// Setup for a static LCD and enable all 24 segment pins.
setup_lcd(LCD_STATIC, 0, 0xFFFFFF);
clear_lcd();
lcd_putc("\f1.23");
while(1);
}
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