PIC to PIC TX RX and PIC to PC COM RX ..a little help please

[Dennis]

Dave ..

Thanks again, but fading memory is better than no memory ( lol or is it ?)

So even if it's wrong it will send me hurtling off in the HSER direction on a voyage of discovery and when I'm truly stumped I will ask for assistance then and only then !

Kind regards

Dennis

[Dennis]

What an awesome calculator proggie ;-)

A true GEM !

Thanks a million

Dennis

[mackrackit]

Thank mister e for the MultiCalc, I use it often.

http://melabs.com/resources/samples/pbp/usart.bas
Play with the above to get started with the USART. Notice they did not use DEFINES.

The program will echo your keyboard with one PIC connected to a PC. The terminal program that is part of MCS is good for this setup. I think the above sample is for 4Mhz. So check the values with MultiCalc.

Keep us posted...

[Dennis]

Hi dave

Thanks again :-)

For my 16f887 i have the following set for using the internal clock

OSCCON = %01110001          'Int CLK 8MHz
ANSEL = %00000000           'All digital
OPTION_REG.7 = 0            'Weak pull-ups enabled

DEFINE OSC 8                '8MHz

So I use 8 MHZ not so ?

For the 184520 the following is set

'Ocsillator selections here
        OSCCON = $70            'Int CLK 8MHz
        OSCTUNE.6 = 1           'PLL 4x
        ADCON1= %00001111       '$0F = disable A/D converter
        cmcon   =   7 
        INTCON2.7 = 0     'switch pull-ups ON
'END of oscillator selections
  'timer/oscillator defines 
        DEFINE OSC 32            '4x 8MHz
'END of timer/oscillator defines

So do I choose 4MHz or 32 MHz ?

thanks a million

Kind regards
Dennis

[mackrackit]

For the 887 use 8Mhz for the calcs.

I am not sure about the 4520, I have not used USART with PLL enabled.
But...
I think the USART uses the primary OSC so try 4Mhz. 50 50 chance of it working

[Dennis]

Hi Dave

Could I set both PICS to 4 MHz internal OSC ?
And once it's working try variations ?

[mackrackit]

That would be the way to trouble shoot.
Just make sure they are running at the expected speed with a blinky and a stop watch or meter if you have one..