7 segment on port A

acidice333 · Joined: 14 Oct 2006 Posts: 33

I'm trying to hookup a 7segment to port A on my 18f2550 (port B is used, I need the internal pull ups on that port).

I stumbled upon the EX_LED example but what do I change in LED_MAP for it to work properly?

My pin configuration. The original code had a pin for the decimal but I don't need it.

Thanks

Ttelmah · Joined: 11 Mar 2010 Posts: 19515

LED_MAP, is the bit patterns to use _in a particular port_, to output the required pattern of LED's. You need to change the lines in the code that output this pattern to the port, not the patterns (except for the DP).
You are only showing 'six segment' wiring. You need seg g as well...
The problem is that the example, outputs an entire byte (using all eight bits), to give seven segments plus DP, then uses two more bits for the digit selects.
Changing the patterns, won't stop the code outputting the whole port...
How many digits are you using?.
Where is segment g, and what are the digit selects connected to?.

Best Wishes

acidice333 · Joined: 14 Oct 2006 Posts: 33

Oh sorry I was up late last night.

seg G is connected to A6, and there is only 1 digit so I don't need to worry about another digit. I ended up just turning each pin on/off in order to make the proper digit but I was hoping to use something like that example instead of a bunch of output_highs and lows.

The original example had pins B0 to B7, but I'm using the 18f2550 with port A but it only has A0 to A6 so I had to rid the DP pin (plus I dont need it) so that shifted the pinouts.