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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 |
seriall data application using PIC16F84A to light up leds
Started by ●July 20, 2003
