Old and beyond help ?

[DavidFMarks]

Hi
Before I post the code I seem to remember that there is a particular etiquette for including code in a post but I can't find any reference to it. Just thought I'd ask as I dont want to upset folk . Thanks

[mackrackit]

Code tags work well.
http://www.picbasic.co.uk/forum/misc.php?do=bbcode#code

Makes thing a little more readable.

[DavidFMarks]

Thanks for that.

My original circuit had three octal darlingtons (ULN 2803) with inputs directly coupled to Ports A, C and D I have also connected leds with 680ohms to each pin so that I can see what the ports outputs are. A test program switched on and off each led in turn thru ports D C and A in that order and worked OK. Problem arose when tryin to switch on all of the A port bits and leave them on. I have now disconnected ther darlington from port a and written the following simple test program:

@ DEVICE pic16f887,intrc_osc_noclkout


PORTD = 0
PORTA = 0
PORTC = 0
TRISD = 0
TRISA = 0
TRISC = 0
 portA.0 = 1
 pause 500
 porta.1 = 1
 pause 500
 porta.2 =1
 pause 500
 porta.3 = 1
 pause 500
 porta.4 = 1
 pause 500
 porta.5 = 1
 pause 500
 porta.6 = 1
 pause 500
 porta.7 = 1
end

I have just run this program and
1. When Microcode studio fired up the Pickit2 the voltage Vdd had been set down to 3.3
2. I turned up Vdd to 5 volts and programmed the chip.
LEDs 0,1,2,3 tuswitched on and then off after the delay. LED 4 switched on and stayed on, LED 5 switched on and then off again after the delay and then LEDs 6 and seven switched on and remainedon. I can see no logic inthis although I have that horrible feeling that it is staring me in the face !

[Archangel]

Thanks for that.

My original circuit had three octal darlingtons (ULN 2803) with inputs directly coupled to Ports A, C and D I have also connected leds with 680ohms to each pin so that I can see what the ports outputs are. A test program switched on and off each led in turn thru ports D C and A in that order and worked OK. Problem arose when tryin to switch on all of the A port bits and leave them on. I have now disconnected ther darlington from port a and written the following simple test program:

@ DEVICE pic16f887,intrc_osc_noclkout


PORTD = 0
PORTA = 0
PORTC = 0
TRISD = 0
TRISA = 0
TRISC = 0
 portA.0 = 1
 pause 500
 porta.1 = 1
 pause 500
 porta.2 =1
 pause 500
 porta.3 = 1
 pause 500
 porta.4 = 1
 pause 500
 porta.5 = 1
 pause 500
 porta.6 = 1
 pause 500
 porta.7 = 1
end

I have just run this program and
1. When Microcode studio fired up the Pickit2 the voltage Vdd had been set down to 3.3
2. I turned up Vdd to 5 volts and programmed the chip.
LEDs 0,1,2,3 tuswitched on and then off after the delay. LED 4 switched on and stayed on, LED 5 switched on and then off again after the delay and then LEDs 6 and seven switched on and remainedon. I can see no logic inthis although I have that horrible feeling that it is staring me in the face !

If this is all of the code, then You have to turn off all the analog stuff to get it to work, ADCON, ANSEL, and Comparators
http://www.picbasic.co.uk/forum/showthread.php?t=561

[DavidFMarks]

Very many thanks. I now have the system fully operational and can start programming the Star of David which should now be appearing in the village tomorrow evening. It might not seem much but by this time tomorrow I confidently expect the village will be swarming with wise men and shepherds. Thanks again folks !

[mackrackit]

Lets see some pictures

[Archangel]

. . .It might not seem much but by this time tomorrow I confidently expect the village will be swarming with wise men and shepherds. . . !

You obviously do not live in Washington DC.

[DavidFMarks]

Spoke too soon !... Not about the shepherds and wise men but about the program working. I have been programming a whole load of different sequences one after another. They have all worked ok until the last few, the program simply ignores them and returns to the beginning. If i bung in a goto directly to the last few sequences the behave erratically (cutting short loops etc. I wonder if I have broken some rule about memory size or borders or some such as I am far from clear on this subject .... To hell with the shepherds I just need the wise men.....