call tud_init() after freeRTOS kernel is started#471
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add note for usb init when using with RTOS
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Describe the PR
TinyUSB IRQ handler make use of RTOS queue API. If stack is initialized before kernel/scheudler, the ISR can invoke RTOS API when kernel is in unknown state which could cause hardfault in case of freeRTOS with portYield().
follow up to #468