8 line display

[anand_manutd]

I was asked to come up with a code to test light a 8 line display.
Each row consist of 16 Led. There are 8 rows
Each row is controlled by a D port pin (as you will see in my codes)
This codes dont seem to work. Please let me know why

Here are my codes

#if defined(__PCM__)
#include <16F877A.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP, NOBROWNOUT
#use delay(clock=20000000)
#endif

#define Clock PIN_C0 //Made Low and High each data input
#define StrobeControl PIN_C4 //Enable pin
#define Strobe1 PIN_E0 //These 3 pins are
#define Strobe2 PIN_E1 // used to strobes
#define Strobe3 PIN_E2 // of each displays
#define DataRow1 PIN_D0 // D
#define DataRow2 PIN_D1 // A
#define DataRow3 PIN_D2 // T
#define DataRow4 PIN_D3 // A Each controls one row
#define DataRow5 PIN_D4 // P
#define DataRow6 PIN_D5 // I
#define DataRow7 PIN_D6 // N
#define DataRow8 PIN_D7 // S
#use fast_io(C)
#use fast_io(D)
#use fast_io(E)

//#define RowLed 16
//#define ColLed 8

void main() {
int Led;
char Pointer,OutRow;

const char Test[1][1]={
0x00FF
};

setup_adc_ports(no_analogs); //to make all IO digital
set_tris_c(0x00); //C0,C4 and C5 are outputs
set_tris_d(0x00); //all D ports are outputs
set_tris_e(0x00); //E0,E1 and E2 are outputs



output_high(StrobeControl); //Strobe for all 8 display is Low
output_low(Strobe1);
output_low(Strobe2);
output_low(Strobe3);


do {
Pointer = Test[0][0];

for(Led=0;Led<16;Led++) {
output_low(Clock); //Clock set to low
output_bit(DataRow1,shift_right(&Pointer,2,0)); //shifts 2 bytes of data into DataRow1, LSB first
output_high(Clock); } //Clock set to high

for(Led=0;Led<16;Led++) {
output_low(Clock); //Clock set to low
output_bit(DataRow2,shift_right(&Pointer,2,0)); //shifts 2 bytes of data into DataRow2, LSB first
output_high(Clock); } //Clock set to high

for(Led=0;Led<16;Led++) {
output_low(Clock); //Clock set to low
output_bit(DataRow3,shift_right(&Pointer,2,0)); //shifts 2 bytes of data into DataRow3, LSB first
output_high(Clock); } //Clock set to high

for(Led=0;Led<16;Led++) {
output_low(Clock); //Clock set to low
output_bit(DataRow4,shift_right(&Pointer,2,0)); //shifts 2 bytes of data into DataRow4, LSB first
output_high(Clock); } //Clock set to high

for(Led=0;Led<16;Led++) {
output_low(Clock); //Clock set to low
output_bit(DataRow5,shift_right(&Pointer,2,0)); //shifts 2 bytes of data into DataRow5, LSB first
output_high(Clock); } //Clock set to high

for(Led=0;Led<16;Led++) {
output_low(Clock); //Clock set to low
output_bit(DataRow6,shift_right(&Pointer,2,0)); //shifts 2 bytes of data into DataRow6, LSB first
output_high(Clock); } //Clock set to high

for(Led=0;Led<16;Led++) {
output_low(Clock); //Clock set to low
output_bit(DataRow7,shift_right(&Pointer,2,0)); //shifts 2 bytes of data into DataRow7, LSB first
output_high(Clock); } //Clock set to high

for(Led=0;Led<16;Led++) {
output_low(Clock); //Clock set to low
output_bit(DataRow8,shift_right(&Pointer,2,0)); //shifts 2 bytes of data into DataRow8, LSB first
output_high(Clock); } //Clock set to high


output_low(StrobeControl); //Strobe made
output_low(Strobe1); // high only
output_low(Strobe2); // for
output_low(Strobe3); // display 1


output_D(0xFF);
//output_D(0x00); //turn it off

//OutRow=OutRow/2;
} while(1);
}

[anand_manutd]

[Leef_me]

>>anand_manutd
>>I was asked to come up with a code to test light a 8 line display.
>>Each row consist of 16 Led. There are 8 rows
>>Each row is controlled by a D port pin (as you will see in my codes)
>>This codes dont seem to work. Please let me know why

Oh, no. Where do I start?

Well it seems by reading some of your comments, and making guesses that each row consists of a 16 bit shift register, and that each shift register is supposed to be selected by the Strobe1, Strobe2, Strobe3 lines
through a decoder of some sort.

If this is incorrect, please provide a description of your hardware, parts numbers are usually a good thing to include.

If those asumptions are correct and you understand the lows and highs required to drive the shift registers. May I suggest problem areas in you code.