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Help on segmented LCD
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PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Mon Feb 07, 2011 3:54 pm

Add the 3 lines (in bold) above the #bit lines, as shown below:

Quote:

#byte LCDSE0 = 0x11C
#byte LCDSE1 = 0x11D
#byte LCDSE2 = 0x11E

#bit SEG0 = LCDSE0.0
#bit SEG1 = LCDSE0.1
#bit SEG16 = LCDSE2.0

pic_micro

Joined: 07 Feb 2011
Posts: 26

special symbol on mechatronic LCD
Posted: Mon Feb 07, 2011 7:41 pm

It works. Can you explain the following? I just want to understand see if I can put others symbols on the LCD #byte LCDSE0 = 0x11C #byte LCDSE1 = 0x11D #byte LCDSE2 = 0x11E 0x11C, etc. are these the addresses? Thanks in advance.

PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Mon Feb 07, 2011 8:37 pm

Yes, those are register addresses. Look in this table, in the 16F917
data sheet. You will see those addresses listed:

Quote:

FIGURE 2-4: PIC16F914/917 SPECIAL FUNCTION REGISTERS

16F917 data sheet:
http://ww1.microchip.com/downloads/en/DeviceDoc/41250F.pdf

pic_micro

Joined: 07 Feb 2011
Posts: 26

How to display the DP (decimal point) on the mechatronic LCD
Posted: Mon Feb 07, 2011 10:26 pm

PCM, Thanks so much, I would like to ask you one more question, how about the DP Any suggestion?

PCM programmer

Joined: 06 Sep 2003
Posts: 21708


Posted: Mon Feb 07, 2011 11:58 pm

Why don't you try to write the code for the DP's.

pic_micro

Joined: 07 Feb 2011
Posts: 26

display DP on mechatronic board

Posted: Tue Feb 08, 2011 12:33 pm

FILE NAME: mech_seg_driver.c

Code:

/*
FILE NAME mech_seg_driver.c

I increase the Digit_Map to 11 and I add 0x01 to represent DP

It is the LCD driver for LCD VIM-332-DP that mount on the
mechatronic board
*/

// The LCD digits are numbered in the following way,
// according to the Varitronix VIM-332-DP data sheet.
// _ _ _
// | |_| |_| |_|
// | |_| |_| |_|
//
// Digit 4 3 2 1
//

// The CCS lcd_symbol() function will be used to display digits
// 1, 2, and 3. The following define statements tell the
// lcd_symbol() function which PIC pins are connected to the
// LCD segment pins.
// There is a table on page 58 of the PicDem Mechatronics
// Demonstration Board data sheet which lists the connections
// that are used to make these define statements.
//
// Digit segments A B C D E F G DP
// b7 b6 b5 b4 b3 b2 b1 b0
#define DIGIT3 COM0+3, COM0+11, COM2+11, COM3+3 , COM2+3, COM1+3, COM1+11, COM3+2
#define DIGIT2 COM0+6, COM0+21, COM2+21, COM3+6, COM2+6, COM1+6, COM1+21, COM3+11
#define DIGIT1 COM0+22, COM0+23, COM2+23, COM3+22, COM2+22, COM1+22, COM1+23, COM3+21

// special symbols
#define display_diode(x) x ? bit_set(LCDDATA5, 0) : bit_clear(LCDDATA5, 0)
#define display_batt(x) x ? bit_set(LCDDATA3, 1) : bit_clear(LCDDATA3, 1)
#define display_volt(x) x? bit_set(LCDDATA3, 0) : bit_clear(LCDDATA3,0)
#define display_ohm(x) x ? bit_set(LCDDATA9, 0) : bit_clear(LCDDATA9, 0)
#define display_satellite(x) x ? bit_set(LCDDATA2, 0) : bit_clear(LCDDATA2, 0)
#define display_minus(x) x ? bit_set(LCDDATA6, 1) : bit_clear(LCDDATA6, 1);
#define display_AC(x) x ? bit_set(LCDDATA9, 1) : bit_clear(LCDDATA9, 1);
#define display_m(x) x ? bit_set(LCDDATA8, 0) : bit_clear(LCDDATA8, 0);
#define display_A(x) x ? bit_set(LCDDATA0, 0) : bit_clear(LCDDATA0, 0);
#define display_K(x) x ? bit_set(LCDDATA6, 0 ) : bit_clear(LCDDATA6, 0);
#define display_M(x) x ? bit_set(LCDDATA11, 0 ) : bit_clear(LCDDATA11, 0);
#define display_RC(x) x ? bit_set(LCDDATA0, 1 ) : bit_clear(LCDDATA0, 1);
#define display_RH(x) x ? bit_set(LCDDATA3, 2 ) : bit_clear(LCDDATA3, 2);
#define display_DH(x) x ? bit_set(LCDDATA0, 2 ) : bit_clear(LCDDATA0, 2);

// The following array tells the CCS lcd_symbol() function which
// segments to turn on, to display the numbers from 0 to 9.
// 0 1 2 3 4 5 6 7 8 9 DP
byte const Digit_Map[11] = {0xFC,0x60,0xDA,0xF2,0x66,0xB6,0xBE,0xE0,0xFE,0xE6,0x01};

#define BLANK 0 // For a blank digit, don't turn on any segments.

#byte LCDDATA0 = 0x110
#byte LCDDATA1 = 0x111
#byte LCDDATA2 = 0x112
#byte LCDDATA3 = 0x113
#byte LCDDATA4 = 0x114
#byte LCDDATA5 = 0x115
#byte LCDDATA6 = 0x116
#byte LCDDATA7 = 0x117
#byte LCDDATA8 = 0x118
#byte LCDDATA9 = 0x119
#byte LCDDATA10 = 0x11A
#byte LCDDATA11 = 0x11B

#byte LCDSE0 = 0x11C
#byte LCDSE1 = 0x11D
#byte LCDSE2 = 0x11E

#bit SEG0 = LCDSE0.0
#bit SEG1 = LCDSE0.1
#bit SEG16 = LCDSE2.0

#bit seg_4bc = LCDDATA6.2 // Controls left-most digit ("1")

int8 lcd_pos;

//-----------------------------------------------
void lcd_putc(char c)
{
int8 segments;

if(c == '\f')
{
lcd_pos = 0;
}
else
{
if((c >= '0') && (c <= '9'))
segments = Digit_Map[c - '0'];
else
segments = BLANK;

switch(lcd_pos)
{
case 1: // 1000's digit (left-most digit on lcd)
if(c == '1') // Is the top digit = 1 ?
seg_4bc = 1; // If so, display it
else // If it's not = 1, don't display it.
seg_4bc = 0;
break;

case 2: lcd_symbol(segments, DIGIT3); break; // 100's digit
case 3: lcd_symbol(segments, DIGIT2); break; // 10's digit
case 4: lcd_symbol(segments, DIGIT1); break; // 1's digit

}
}

lcd_pos++;
}

FILENAME main.c

I can display the dp into the LCD with the "lcd_symbol(0x01, DIGIT1); " but I am out of ideal how to implement it into the void lcd_putc(char c) function.

Code:

#include <mechatronic.h>

#define enable_symbol_segments(x) SEG0 = x; SEG1 = x; SEG16 = x

void main()
{
unsigned int16 value;
unsigned int temp;

// initial lcd
setup_lcd(LCD_MUX14 | LCD_BIAS_PINS, 0);
enable_symbol_segments(TRUE);

while(1)
{
/*
value = 1234;


   display_diode(FALSE);

if(value < 600)
   {

      output_high(LED);
      output_low(LED2);

      display_batt(TRUE); // Batt symbol
      display_volt(TRUE); // V symbol
      display_ohm(FALSE); // Ohm symbol
      display_satellite(TRUE); // Satellite symbol
      display_minus(TRUE); // - sign symbol
      display_AC(TRUE); // AC symbol
      display_m(TRUE); // m symbol
      display_A(TRUE); // A symbol
      display_K(TRUE); // K symbol
      display_M(TRUE); // M symbol
      display_RC(TRUE); // RC symbol
      display_RH(TRUE); // RH symbol
      display_DH(TRUE); // DH symbol
      display_diode(TRUE); // diode symbol


   }
   if(value >600)
   {
         output_high(LED2);
      output_low(LED);
      display_batt(FALSE);
      display_volt(FALSE);
      display_ohm(TRUE);
   }
*/
// printf(lcd_putc,"\f%4lu",value); // Always send 4 digits
   lcd_symbol(0x01, DIGIT1); // display s2dp
   lcd_symbol(0x01, DIGIT2); // display s3dp
   lcd_symbol(0x01, DIGIT3); // display s4dp

/* I can display the dp into the LCD with the above lines, but I don't know now to map or use it without the "lcd_symbol(0x01, DIGIT1); "
*/
}
}

PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Tue Feb 08, 2011 3:08 pm

Quote:

I can display the dp into the LCD with the above lines, but I don't
know now to map or use it without the "lcd_symbol(0x01,DIGIT1);

You were able to make code to display all the other symbols, as shown
below. Try to do the same thing for the 2DP, 3DP, and 4DP symbols:

Code:

// special symbols
#define display_diode(x) x ? bit_set(LCDDATA5, 0) : bit_clear(LCDDATA5, 0)
#define display_batt(x) x ? bit_set(LCDDATA3, 1) : bit_clear(LCDDATA3, 1)

Quote:

but I am out of ideas how to implement it into the void lcd_putc(char c) function.

You're giving lcd_putc() a sequence of ASCII numbers, one character at a
time, for example, "1.234". So clearly at some point, the lcd_putc()
routine will get the '.' character as a parameter. You need to add code to
lcd_putc() to handle it. Add an "if" (or "else if") statement for it. Make
sure you don't increment the lcd_pos variable if you are handling the
decimal point.

pic_micro

Joined: 07 Feb 2011
Posts: 26

display 7-seg DP

Posted: Wed Feb 09, 2011 9:01 am

Here is what I've done and it always display " 1 . " no matter what the value is:

Code:

#include <mechatronic.h>

#define enable_symbol_segments(x) SEG0 = x; SEG1 = x; SEG16 = x

void main()
{
double value;
unsigned int temp;

// initial lcd
setup_lcd(LCD_MUX14 | LCD_BIAS_PINS, 0);
enable_symbol_segments(TRUE);

value = 12.3;

while(1)
{

printf(lcd_putc,"\f%4f1u", value);

}
}

File name: mech_seg_driver.c

Code:

/*
FILE NAME mech_seg_driver.c
It is the LCD driver for LCD VIM-332-DP that mount on the
mechatronic board
*/

// The LCD digits are numbered in the following way,
// according to the Varitronix VIM-332-DP data sheet.
// _ _ _
// | |_| |_| |_|
// | |_| |_| |_|
//
// Digit 4 3 2 1
//

// The CCS lcd_symbol() function will be used to display digits
// 1, 2, and 3. The following define statements tell the
// lcd_symbol() function which PIC pins are connected to the
// LCD segment pins.
// There is a table on page 58 of the PicDem Mechatronics
// Demonstration Board data sheet which lists the connections
// that are used to make these define statements.
//
// Digit segments A B C D E F G DP
// b7 b6 b5 b4 b3 b2 b1 b0
#define DIGIT3 COM0+3, COM0+11, COM2+11, COM3+3 , COM2+3, COM1+3, COM1+11, COM3+2
#define DIGIT2 COM0+6, COM0+21, COM2+21, COM3+6, COM2+6, COM1+6, COM1+21, COM3+11
#define DIGIT1 COM0+22, COM0+23, COM2+23, COM3+22, COM2+22, COM1+22, COM1+23, COM3+21

// special symbols
#define display_diode(x) x ? bit_set(LCDDATA5, 0) : bit_clear(LCDDATA5, 0)
#define display_batt(x) x ? bit_set(LCDDATA3, 1) : bit_clear(LCDDATA3, 1)
#define display_volt(x) x? bit_set(LCDDATA3, 0) : bit_clear(LCDDATA3,0)
#define display_ohm(x) x ? bit_set(LCDDATA9, 0) : bit_clear(LCDDATA9, 0)
#define display_satellite(x) x ? bit_set(LCDDATA2, 0) : bit_clear(LCDDATA2, 0)
#define display_minus(x) x ? bit_set(LCDDATA6, 1) : bit_clear(LCDDATA6, 1);
#define display_AC(x) x ? bit_set(LCDDATA9, 1) : bit_clear(LCDDATA9, 1);
#define display_m(x) x ? bit_set(LCDDATA8, 0) : bit_clear(LCDDATA8, 0);
#define display_A(x) x ? bit_set(LCDDATA0, 0) : bit_clear(LCDDATA0, 0);
#define display_K(x) x ? bit_set(LCDDATA6, 0 ) : bit_clear(LCDDATA6, 0);
#define display_M(x) x ? bit_set(LCDDATA11, 0 ) : bit_clear(LCDDATA11, 0);
#define display_RC(x) x ? bit_set(LCDDATA0, 1 ) : bit_clear(LCDDATA0, 1);
#define display_RH(x) x ? bit_set(LCDDATA3, 2 ) : bit_clear(LCDDATA3, 2);
#define display_DH(x) x ? bit_set(LCDDATA0, 2 ) : bit_clear(LCDDATA0, 2);
#define display_s2DP(x) ? bit_set(LCDDATA11, 5) : bit_clear(LCDDATA11, 5);

// The following array tells the CCS lcd_symbol() function which
// segments to turn on, to display the numbers from 0 to 9.
// 0 1 2 3 4 5 6 7 8 9 DP
byte const Digit_Map[11] = {0xFC,0x60,0xDA,0xF2,0x66,0xB6,0xBE,0xE0,0xFE,0xE6,0x01};

#define BLANK 0 // For a blank digit, don't turn on any segments.

#byte LCDDATA0 = 0x110
#byte LCDDATA1 = 0x111
#byte LCDDATA2 = 0x112
#byte LCDDATA3 = 0x113
#byte LCDDATA4 = 0x114
#byte LCDDATA5 = 0x115
#byte LCDDATA6 = 0x116
#byte LCDDATA7 = 0x117
#byte LCDDATA8 = 0x118
#byte LCDDATA9 = 0x119
#byte LCDDATA10 = 0x11A
#byte LCDDATA11 = 0x11B

#byte LCDSE0 = 0x11C
#byte LCDSE1 = 0x11D
#byte LCDSE2 = 0x11E

#bit SEG0 = LCDSE0.0
#bit SEG1 = LCDSE0.1
#bit SEG16 = LCDSE2.0

#bit seg_4bc = LCDDATA6.2 // Controls left-most digit ("1")

int8 lcd_pos;

//-----------------------------------------------
void lcd_putc(char c)
{
int8 segments;

if(c == '\f')
{
lcd_pos = 0;
}

else
{
if((c >= '0') && (c <= '9'))
segments = Digit_Map[c - '0'];
if(c == '.')
segments = 0x01; else
segments = BLANK;

switch(lcd_pos)
{
case 1: // 1000's digit (left-most digit on lcd)
if(c == '1') // Is the top digit = 1 ?
seg_4bc = 1; // If so, display it
else // If it's not = 1, don't display it.
seg_4bc = 0;
break;

case 2: lcd_symbol(segments, DIGIT3); break; // 100's digit
case 3: lcd_symbol(segments, DIGIT2); break; // 10's digit
case 4: lcd_symbol(segments, DIGIT1); break; // 1's digit

// default: lcd_symbol(
}
}

lcd_pos++;
}

I also try add this in mech_seg_driver.c file(similar to the symbol) and it got error when compile

Code:

#define display_s2DP(x) ? bit_set(LCDDATA11, 5) : bit_clear(LCDDATA11, 5);

Added this to main.c file

Code:

display_s2DP(TRUE);

Code:

Executing: "C:\CCS_PIC\PCM\PICC\Ccsc.exe" "main.c" +FM +DF +LN +T -A +M +Z +Y=9 +EA
>>> Warning 225 "C:\chai\CProjects\PICC Experiment\CCS\mechatronic\battery_symbol\mech_seg_driver.c" Line 41(18,75): Duplicate #define
>>> Warning 203 "C:\chai\CProjects\PICC Experiment\CCS\mechatronic\battery_symbol\main.c" Line 19(1,1): Condition always TRUE
*** Error 51 "C:\chai\CProjects\PICC Experiment\CCS\mechatronic\battery_symbol\main.c" Line 21(20,21): A numeric expression must appear here
1 Errors, 2 Warnings.
Halting build on first failure as requested.
BUILD FAILED: Wed Feb 09 09:57:57 2011

[/code]

PCM programmer

Joined: 06 Sep 2003
Posts: 21708


Posted: Wed Feb 09, 2011 10:58 pm

I can't really work on this during the week. Maybe I can work on it during the weekend sometime.

pic_micro

Joined: 07 Feb 2011
Posts: 26

LCD
Posted: Mon Feb 14, 2011 7:26 am

PCM, Any update?

PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Mon Feb 14, 2011 6:35 pm

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:

Quote:

1.23

It was also tested with the decimal points in two other locations, and it
successfully displayed them:

Quote:

.123 and 12.3

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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