BasicMicro - Forums

Hi there,

I'm trying to get the hpwm command to make period pulses of 10000us on the basicatom 24-m board.
The atom_manual says the following:



i do the following:


but end up with a period of 500us. so i figure to multiply <period> and <duty> by 20 to get 10000us but end up with a period just below 200us. am i using the hpwm command incorrectly or is something else amiss here?

The largest period on the Atom or Nano processors are 16383(eg 0x3FFF). Any bits over that range are lost. That is causing the 200us because the high bits after the times 20 are being dropped.

The slowest HPWM on a 20mhz Atom is 819us or about 1.22khz

The slowest HPWM on the Nano is 4 times slower, 3.276ms.

The AtomPro has a much larger range fo its HPWM, max range of 524287 but it is in clock cycles(eg no devide by 4) so it's longest period is mhz/524287(32.768ms at 16mhz or 26.2144ms at 20mhz).

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Nathan Scherdin
Basic Micro - Robotic Technology Evolved

thanks that helped me out