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The attached adctest_26K22 simulates ok but doesn't convert properly in hardware. The result for the integer option is a (seemingly) random sequence of the values 0, 128, 256, 512 & 768. I tried another 18F26K22 chip and got the same result.

I then recompiled the flowchart as adctest_2525 (also attached), with different C code register operations to preserve the 16MHz clock, for an 18F2525 and it works as expected.

I suspect there is something wrong with the C code generated to handle the 18F26K22 analogs.

Thanks,

Brian Walsh.

Have you seen this?
http://www.matrixmultimedia.com/mmforum ... =29&t=8700

Thanks Steve. That worked. I'll look there in future before cluttering the list.

Brian.