Add FreeRTOS support thanks to @hfellner #533
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Using all the work from @hfellner and others. Things work but are not stable (i.e. flash operations will make things go badly, fast; delay() does not actually release the core for other work, etc.).
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Making delay() release the core for other work would be simple by making the default implementation a weak symbol and providing an override in the RP2040_FreeRTOS library that calls vTaskDelay(delay / portTICK_PERIOD_MS). However, this cannot be done for delayMicroseconds(), because the minimum yield period for FreeRTOS on the RP2040 is 1ms. |
Use a PIO machine to record cycles instead of systick
earlephilhower
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Use a task-based approach for handling the USB periodic work instead of the IRQ-based one in the main core. Fix a hang under -Os (but not under any other conditions?!) caused by the (unused) FIFO IRQ handler. Set 8 prio levels so it fits in 3 bits nicely (0..7)
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Using all the work from @hfellner and others. Things work but are not
stable (i.e. flash operations will make things go badly, fast; delay()
does not actually release the core for other work, etc.).