tefbox
Joined: 15 Mar 2011
Posts: 5
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| help needed with LCD module [solved] |
 Posted: Thu Mar 17, 2011 8:07 am |
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Using a PIC16F917 and PCM v 4.119, trying to get a 3 segment Static LCD going. Wasn't happening with my code, so I tried the CCS ex_92LCD, which looked similar to what I was doing before...the below is a stripped down version of the code made to just flash '888' and '000'.
The code hang when it comes to lcd_symbol(). The assembly code continually looks for the WA bit in the LCDPS register to go high. This bit when high signifies that a write to the LCDDATAx registers is allowed. The problem is that this bit is always low in my program.
When I write directly to the LCDDATAx registers even when WA is low the WERR bit in the LCDCON register stays low. This bit I would think should go high if the LCDDATAx registers are written when WA is low...but doesn't. I've been searching the data sheets trying to figure out what controls the WA bit, but haven't had any luck. I was playing around with LCD interrupts...but blindly...not sure if I need to. Looking at the 16C924 data sheet (ex_92LCD was made for this chip) the LCD module looked similar to the F917, figured it'd be transferrable.
| Code: |
#include <16f917.h>
#fuses INTRC_IO,NOWDT,PUT
#use delay(clock=4000000)
// Digit segments A B C D E F G DP
// b7 b6 b5 b4 b3 b2 b1 b0
#define DIGIT3 COM0+27, COM0+28, COM0+29, COM0+30, COM0+8, COM0+9, COM0+10 //100s place
#define DIGIT2 COM0+3, COM0+24, COM0+2, COM0+40, COM0+39, COM0+5, COM0+26 // 10s place
#define DIGIT1 COM0+33, COM0+34, COM0+35, COM0+36, COM0+6, COM0+7, COM0+18 // 1s place
// character 0 1 2 3 4 5 6 7 8 9
byte const Digit_Map[10] = {0xFC,0x60,0xDA,0xF2,0x66,0xB6,0xBE,0xE0,0xFE,0xE6};
void main() {
setup_lcd(LCD_STATIC|LCD_INTRC, 2, 0xfff4ff);
while(TRUE) {
lcd_symbol(Digit_Map[0],DIGIT3); // fill 100s place
lcd_symbol(Digit_Map[0],DIGIT2); // fill 10s place
lcd_symbol(Digit_Map[0],DIGIT1); // fill 1s place
delay_ms(500);
lcd_symbol(Digit_Map[8],DIGIT3); // fill 100s place
lcd_symbol(Digit_Map[8],DIGIT2); // fill 10s place
lcd_symbol(Digit_Map[8],DIGIT1); // fill 1s place
delay_ms(500);
}
} |
Last edited by tefbox on Thu Mar 17, 2011 10:18 am; edited 1 time in total |
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