DOT matrix display using 74hc595 & cd4017 in pic16f877a

[Pikasa]

dear all,

I am trying to interface 8X8 dot matrix display in PIC CCS. i am getting some problem in this. Can anyone help, i am trying for 2 days.

my code is below


long int chk[]={0b00011111, 0b00010000, 0b00010000, 0b00011110, 0b00000001, 0b00000001, 0b00000001, 0b00011110}
void main()
{

set_tris_c(0x00);
set_tris_d(0x00);
while(TRUE)
{

count();


}
}


void count()
{
for(i=0;i<8;i++)
{

shift(chk[i]);
CD_CLK = 1;
delay_us(1500);
CD_CLK = 0;
delay_us(1500);
}
CD_RST = 1;
delay_us(500);
CD_RST = 0;
}

void shift(unsigned long int temp)
{
unsigned long int mask = 0x01;
int flag;
int t;

for(t=0;t<8;t++)
{

flag = temp & mask;
if(flag == 0)
SERIAL_DATA = 0;
else
SERIAL_DATA = 1;
SH_CP = 1;
// delay_us(500);
SH_CP = 0;
// delay_us(500);
mask = mask << 1;

}
ST_CP = 1;
//delay_us(500);
ST_CP = 0;
//delay_us(500);
}

[Mike Walne]

It's been done loads of times on this forum and elsewhere.

1) Read the forum guidelines.
2) Show us a schematic.
3) Tell us your compiler version as well as PIC.
4) Post the shortest possible complete and compilable code which shows your problem. (So we can copy and paste to test.)
5) Explain what you can see and were expecting to happen.
6) Learn to use the code button.

Mike

[temtronic]

You should really post your entire program as there may be errors outside of the code 'snippet' you show in your post.

1) have you run a '1Hz LED' program to confirm your PIC really runs properly?

2) create a small program using the 595 and 8 LEDs and confirm you can control/code/program access to it properly

3) THEN add the 4017 and cut code as required.

The idea is to start small, get code to function THEN proceed to the next 'layer' or 'feature' you want. Trying to do it all at once hard.

Also with that PIC you could do an 8by8 matrix without the 595 and 4017 devices. Perhaps it might be an option, though you use a few more I/O pins.

Jay