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Topics - Thorsten

2
USB Infrared Toy / Wrong frequency calculation?
Hi there,

I'm currently doing my first steps with the USB IR Toy and the Pyton module. I want to implement some more functions to the python module (and share it, of course), but I got some issues that I can't explain to myself. Im trying to implement the frequency detection with the help of this documentation: http://dangerousprototypes.com/docs/USB ... pling_mode

My calculation (based on the docs) return some strage values, that can't be right, no matter where I place the remote (near, far).

Based on this example:
{00}{F4}{02}{43}{03}{91}{01}{B3}

0x00f4 - start timer
0x0243 - timer 1
0x0391 - timer 2
0x01b3 - total count of infrared modulated light pulses

PIC timer Period 1 count = 0x0243-0x00f4=0x14F (334)
PIC timer Period 2 count = 0x0391-0x0243=0x14E (333)
Total infrared pulse count = 0x01b3 = 435

I do my calculations like this:
{5c}{92}{f9}{41}{2b}{eb}{00}{01}

0x5c92 - start timer
0xf941 - timer 1
0x2beb - timer 2
0x0001 - total count of infrared modulated light pulses

PIC timer Period 1 count = 0xf941-0x5c92=0x9caf (40111)
PIC timer Period 2 count = 0x2beb-0xf941=-0xcd56 (-52566)
Total infrared pulse count = 0x0001 = 1

The result looks wrong to me, especially because of the negative value of the second calculation. In the example the results of calculation 1 and calculation 2 are really close to each other - mine are really far from each other ^^

I'm currently using USB IR Toy v2 with the 2.2 Firmware.

Can somebody please help me?

Greetings,
Thorsten

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