4094 Please Help

[dovegroup]

hello
I wrote this for the 16F877 for 2 4094
The first 4094 works correctly the second not
What I do wrong please help
thanks

INCLUDE "modedefs.bas"


TRISC = %00000000         

symbol clock=portc.0
symbol data_pin=portc.1
symbol strb=PORTc.2
symbol data_pin2=portc.3

main:
high strb
high data_pin 'FOR STROBE HIGH
ShiftOut data_pin,clock,1,[%11000011] 
low strb
low data_pin

high strb
high data_pin2
ShiftOut data_pin,clock,1,[%10000001]                              
low strb
low data_pin2
pause 2000
goto main

[IMG][/IMG]

[mackrackit]

Maybe add this to your code?

ShiftOut data_pin2,clock,1,[%10000001]

[dovegroup]

Hi mackrackit
Thank's for your thoughts
I tried ShiftOut data_pin2,clock,1,[%11000011] but not working properly U2

[Ioannis]

I would recomend seperate control pins for the second 4094 (OE and STRB) with common CLK.

Or even better, use the two 4094 in chain and feed data to the second Data in out of the first 4094, using common controls as you do now.

Ten you have to send 16bits of course, before activate outputs.

Ioannis

[dovegroup]

Hi Ioannis

You're right it works perfectly
View circuit and program to Picbasic

Thank you very much my friend Ioannis

INCLUDE "modedefs.bas"
DEFINE SHIFT_PAUSEUS 100

TRISC = %00000000         

symbol clock=portc.0
symbol data_pin=portc.1
symbol strb1=PORTc.2
symbol strb2=PORTc.3
alarm var word
miso var byte

alarm = %1001100111010111
miso = alarm>>8

main:

high strb1
ShiftOut data_pin,clock,0,[alarm\8]                              
low strb1

high strb2
ShiftOut data_pin,clock,0,[miso] 
low strb2

pause 2000
goto main

[mehmetOzdemir]

HI DOVEGROUP.

YOU DONT NEED TO USE EXTRA PINS FOR ANOTHER 4094.YOU CAN USE SAME PORTS.

YOU CAN CONNECT "Qs DATA OUT" TO ANOTHER 4094.

include "modedefs.bas"

    ADCON1  = 7
    
    
    
    STRB  VAR  PORTC.2
    DAT   VAR  PORTC.1
    CLK   VAR  PORTC.0
    
    OUTPUT STRB
    OUTPUT DAT
    OUTPUT CLK
    
    DATA_1  VAR BYTE
    DATA_2  VAR BYTE
    
    DATA_1 = %11000011
    DATA_2 = %10000001
    
    
    
    
    MAIN :
    
    SHIFTOUT DAT , CLK , 1,[DATA_2 , DATA_1]
    STRB = 1  : PAUSEUS 100 :  STRB = 0
    

    	
GOTO MAIN

[Ioannis]

Hmm, although I did proposed that too, dovegroup prefered to do the other way. May be it he needs seperate control over the second chip.

If there are free pins then it is OK I guess.

Ioannis