have an problem with unsigned integer division

mthornton · Joined: 22 Jan 2008 Posts: 4 Location: Canal Flats BC

I have an issue with unsigned integer division, using a 16F88, job is a frequency generator.

problems with the result in half_period
frequency is a value from 1-1000, determined from a scan of bcd switches.
it works fine so long as freq is <256, then it messes up.

unsigned int16 freq;
unsigned int32 half_period

half_period = 500000/freq;

help!

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

Show the printf statement that you're using to display the result.

Post your compiler version.

mthornton · Joined: 22 Jan 2008 Posts: 4 Location: Canal Flats BC

Compiler version : PCM 3.241
didn't use a printf statements, as the output is the signal out

I found the problem, which was my misunderstanding of the type conversion in the routine used to create the "frequency" variable (unsigned 16 bit) from 3 - 8-bit bcd switches. Won't get bitten by this again.