POPE19
Joined: 27 Jun 2017
Posts: 71
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| Improper display segments |
 Posted: Wed Sep 06, 2017 10:28 am |
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Hello,
I am using PIC16F1939 to interface 7 segment LCD (3 digits). I have interfaced the LCD with the pic using the Internal register Ladder. I am observing the strange problem.
When i manually change counts for digits 1,2,3 then everything is displayed as input inserted, but when i put count=11 (which is null) the lcd displays erratic segments instead of turning all segments off.
Any suggestions as to why this is happening.
| Code: |
#include <16F1939.h>
#fuses HS ,NOVCAP, MCLR, NOWDT, PUT, NOIESO, BROWNOUT, NOFCMEN,PLL_SW,WRT,CPD
#use delay(crystal=20MHz, clock=20MHz)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)
//====================================================================================================|
//====================================================================================================|
// LCD Configuration |
//====================================================================================================|
// Digit segments A B C D E F G DP
// b7 b6 b5 b4 b3 b2 b1 b0
#define DIGIT3 COM0+11, COM1+11, COM2+11, COM3+11, COM2+10, COM0+10, COM1+10, COM3+10
#define DIGIT2 COM0+17, COM1+17, COM2+17, COM3+17, COM2+18, COM0+18, COM1+18, COM3+18
#define DIGIT1 COM0+19, COM1+19, COM2+19, COM3+19, COM2+20, COM0+20, COM1+20, COM3+20
// ComX+Y is combination of Backplan0-3 and Segment0-SegmentXX
//=====================================================================================================|
// character 0 1 2 3 4 5 6 7 8 9 Null
//byte const Digit_Map[11] = {0xFD,0x61,0xDB,0xF3,0x67,0xB7,0xBF,0xE1,0xFF,0xF7,0x01}; //Decimal
byte const Digit_Map_1[11] = {0xFC,0x60,0xDA,0xF2,0x66,0xB6,0xBE,0xE0,0xFE,0xF6,0x00}; //no Decimal
//===================================================================================================//
// Segments Initilization //
// Seg23 Seg22 ... Seg12 Seg11 Seg10 Seg9 Seg8 Seg7 Seg6 Seg5 Seg4 Seg3 Seg2 Seg1 Seg0 //
// 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 0/1 //
// if bit_SegX is 1, SegX is set as Segment Output. Otherwise //
//===================================================================================================//
#define Segments 0x1E0C00 // Initilize LCD SegmentX
//============================================================================//
int count3 = 0;// after decimal
int count2=0; // 1st digit
int count1=0; // 2nd digit
//============================================================================//
void Display()
{
lcd_symbol (Digit_Map_1[count3], DIGIT3);
lcd_symbol (Digit_Map_1[count2], DIGIT2);
lcd_symbol (Digit_Map_1[count1], DIGIT1);
}
//============================================================================//
void main()
{
set_tris_a (0xC9); //set RA-0,3,5,6,7 as inputs
set_tris_b (0xCF);
set_tris_c (0x80);
set_tris_d (0x0C);
set_tris_e (0x08);
setup_comparator (NC_NC_NC_NC);
enable_interrupts (INT_TIMER0);
enable_interrupts(GLOBAL);
// set segments, contrast, internal resistor ladder
setup_lcd(LCD_MUX14|LCD_HALT_IDLE|LCD_FOSC|LCD_VOLTAGE3 |LCD_REF_ENABLED |LCD_REF_VDD|LCD_A_HIGH_POWER |LCD_B_MED_POWER|LCD_A_CLOCK4,3, Segments);
count1 = 8;
count2 = 8;
count3 = 8;
Display ();
delay_ms (1000);
printf("hello started");
while (TRUE)
{
count1=11;
count2=11;
count3=11;
Display();
}
}
|
Using CCS PCWH 5.072 compiler. |
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