TinyUSB memory usage question

[Unturned3]

In the cdc_msc_freertos example, the usb_device_task is given 4096 words (i.e. 16KB) for its stack. Is this just an aribtrary value, or the minimum size needed for TinyUSB to function? I was quite surprised by how much RAM the task needs.

In contrast, ST's USB device CDC implementation (the one that comes with CubeIDE) seems to take only a few KBs of memory.

[hathach]

4096 is given for esp32 only since it requires a bit for logging/printf and esp32 has plenty of ram. For stm32 you can try with 256/512 to see if that works. Stack size could depends on dynamic event and workflow, so you still need to monitor its usage with debugger/sysview or simply printf to be sure

[Unturned3]

I see, thanks! I tried 256 for the task stack size, and it seemed to work smoothly.

Unfortunately STM32F411CE only has 4 USB endpoints... took me quite some head-banging to eventually realize why cdc_dual_ports was not working. I thought something was wrong with my FreeRTOS setup.