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esp32/esp32_rmt: Update FIXME on RMT module.

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Signed-off-by: Elvis Pfutzenreuter <elvis.pfutzenreuter@gmail.com>
This commit is contained in:
Elvis Pfutzenreuter
2025-12-27 12:10:33 -03:00
committed by Damien George
parent 85a15f995c
commit da6a18ffe0
1 changed files with 6 additions and 7 deletions
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13
ports/esp32/esp32_rmt.c
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@@ -193,14 +193,13 @@ static void esp32_rmt_deactivate(esp32_rmt_obj_t *self) {
if (self->enabled) {
// FIXME: panics in ESP32 if called while TX is ongoing and TX sequence is long (>300ms)
// Does not panic in ESP32-S3, ESP32-C3 and ESP32-C6.
// Tested with ESP-IDF up to 5.5
// ESP-IDF issue: https://github.com/espressif/esp-idf/issues/17692
// Happens with ESP-IDF up to 5.5.1. Fixed in ESP-IDF 5.5.2.
// ESP-IDF GitHub issue: https://github.com/espressif/esp-idf/issues/17692
//
// Cause is Interrupt WDT to trigger because ESP-IDF rmt_disable() disables
// interrupts and spinlocks until the ongoing TX sequence is finished.
//
// Workaround is never try to stop RMT sequences longer than 300ms (which are unusual
// anyway). Or apply the patch mentioned at the GitHub issue to ESP-IDF.
// Workarounds:
// - recompile with ESP-IDF 5.5.2 or better
// - never try to stop RMT sequences longer than 300ms
// - apply to ESP-IDF the patch mentioned at the GitHub issue
rmt_disable(self->channel);
self->enabled = false;
}