Stanley Lee schrieb:
> Hi,
>
> Here's more news about the progress so far. I have added Jan's code on
> the initialization in the initialization.c file. My quesiton on the
> initialization is the fact that I'm unsure of how I should deal with the
> first parameter of adc_open function. I have typed in my guess after
> looking at adc.h, and indicated my doubts on my initialization.c.
See my patch (link was in the last mail) for the pic18fXX50 devices. The
adc_open, adc_setchanel and adc_busy functions dont work for pic18fXXXX.
You need to apply the patch,edit the #if defined and recompile/install
sdcc to make the adc library work for pic18fXXXX devices.
All #if defined should look like:
if defined(pic18f2455) || defined (pic18f2550) \
|| defined(pic18f4455) || defined (pic18f4550) \\
|| defined(pic18f2525) || defined (pic18f2620) \\
|| defined(pic18f4525) || defined (pic18f4620)
Remember to do this in adcsetch.c, adcopen.c, adcbusy.c and adc.h
Hopefully this patch will someday be part of sdcc.
>
> I have a separate source file (adcisr.c) that deals with the a/d
> conversion ISR. I have basically incorporated Jan's code, except I have
> modified it to work for one a/d channel (AN0) to free up the other
> channels as I only need to sample one channel. I have also an accessor
> function that allows me to access the a/d channel input values from any
> other source file of my project.
One advice here:
You need to disable the adc_int during your adcval function. If you dont
then there is a slight chance that your read garbage when the interrupt
is triggered during the function call.
> However, when I tested my code using
> the PWM toggling method. I don't seem to see a PWM output at the
> corresponding port B pin no matter how I vary the voltage input from
> adjusting a potentiometer. I infer that there is something wrong with
> the structure of my project as I have limited experience working with
> multiple source files (I don't want to squeeze everything into a single
> main.c file either).
This is mainly because of the missing patch. Apply it as described above
and retry it pls.
>
> Any insights would be much appreciated.
if your really need pwm pls use the pic pwm modul.
jan
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