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| 07:24.27 | Stormwind_mobile | schneider: a pwm_burst() function would be a good building block as enabler for sending IR remote control signals. |
| 08:29.41 | Stormwind_mobile | The most common carrier frequencies are around 38kHz most often, a few percent tolerance are fine. |
| 08:35.45 | Stormwind_mobile | There's multiple ways of tackling the problem. Setting the carrier frequency, is universal. For ease of use, it maybe even hardcoded in the function/library |
| 08:37.41 | Stormwind_mobile | So if there's a way the MCU can be set to fire an interrupt at 38kHz, or maybe twice that frequency, then the whole problem collapses into gating a GPIO in the corresponding ISR |
| 08:51.04 | Stormwind_mobile | One method could be passing the number of pulses at 38kHz that are to be sent, then a second number of pulses that the IR LED is kept off. |
| 08:57.28 | Stormwind_mobile | E.g. for the NEC protocol, and 36kHz carrier frequency this could be encoded like "toggle the LED 20 times, then keep it off 20 times" for a logical 0, similarly 20 toggles and 40 offs for a 1 |
| 09:00.16 | Stormwind_mobile | There's a "start bit" of 324 pulses, then 162 cycles off, then a bunch of 20 pulses and 20/40 cycles off. |
| 09:01.25 | Stormwind_mobile | Bottom line: ISR fires at 72 kHz |
| 09:02.20 | Stormwind_mobile | Toggles a defined GPIO based on a flag bit that signals if a pulse train is to be sent or not |
| 09:03.29 | Stormwind_mobile | Or rather gets passed a number of cycles that its counting down and either toggles the GPIO or just silently counts down |
| 09:05.00 | Stormwind_mobile | (I guess it would be better again to make a wiki page for the topic, documenting and explaining the principle there, or linking to a bunch of sources that explain the protocols) |
| 09:07.45 | Stormwind_mobile | I guess I'll just do that if the logix bot is working again. |
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| 13:17.58 | *** topic/#card10badge is Logix (Wiki): https://card10.badge.events.ccc.de/ git: https://git.card10.badge.events.ccc.de/card10 % current version: https://card10.badge.events.ccc.de/en/firmwareupdate/ % Display: https://www.aliexpress.com/item/4000018872259.html |
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