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Discussion Groups | Piclist | seriall data application using PIC16F84A to light up leds

A discussion group for the PICMicro microcontroller. Also called the Microchip PIC, this list is dedicated to the use and abuse of this fine, simple, microcontroller. Close to topic posts are welcome, ie. general electronics.


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seriall data application using PIC16F84A to light up leds - rahzdapoj - Jul 20 9:54:00 2003

hi...
i'm desperately seeking for help...i'm trying to complete this
application but i cannot seem to light up the leds...i dunno whether
my program is functioning correctly..pls....i desperately need
help...the details of my application are given below.... serial data application
===========================

pulse--space(on)--pulse--space(on)--pulse---space(on)--pulse
_____ _____ _____ _____
| | 1 | | 2 | | 3 | |
_____| |___________| |____________| |____________| |_

0.6ms|0.3ms| 1ms |0.6ms|0.3ms| 1ms |0.6ms|0.3ms| 1ms |0.6ms
pulse (space) (space) (space)

(1st,2nd,3rd led on)
pulse--pulse(off)-pulse--pulse(off)--pulse-space(on)---pulse
_____ ____ ____ ____ _____ _____
| | | | | | | | | | | |
_____| |___| 1 |___| |___| 2 |____| |______3____| |_

0.6ms|0.3ms|0.6| 0.3|0.6|0.3 |0.6|0.3 |0.6 | 0.3 | 1ms |0.6 | 0.3 | (1st,2nd off, 3rd on)

a pulse is always called signalling the transmission of 16 types of
data. when ever an led is to
be ON a space(1ms)is called. if the led is to be OFF then another
pulse is called after the first
pulse and then following that 2nd pulse a third pulse is called to
signal the transmission
of the next data.

these pulses will be inputted to portA, 2 and the corressponding LED
is to be connected to
RB0-RB7. 2 PICs will be needed for sixteen LEDs using portB to
output to the LEDs.

i am using PIC16F84A and rc oscillator of 4MHz. please could anyone
help me because i am having
troubles lighting up my leds.

below i have included my program initially used but doesnt output
the required results.
p/s sw1 and sw2 are registers used to store the data first before
outputted to portb of the
2 pics.
are there problems with the delay that i have used????
i am open to any suggesttions.........thanx for any help possible



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