Calculators with Support of the 82240 IR-Printer

[Marcus von Cube]

(08-06-2014 08:15 AM)Martin Hepperle Wrote:  Some Numbers
The frequency of the IR signal is f = 32768 Hz so that one pulse of 50% duty cycle has a duration of t_pulse = 1/32768 / 2 = 15.3 us (microseconds)).
The HP docs specify a burst length of 6 to 8 pulses = 183 to 244 us as valid range. All my test calculators output 8 pulses per burst.

If I understand my code correctly, WP 34S outputs bursts of seven pulses. The generator is just the AND of two square wave clocks: 32768Hz and (32768/14)Hz. If you want to check the code, it's in trunk/main.c, routine put_ir().