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update doc

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hathach 2019-11-01 10:13:19 +07:00
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docs/porting.md
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@ -130,6 +130,8 @@ number and direction which usually determines where to write the buffer info. Th
written to a specific location in memory and the peripheral is told the data is valid. (Maybe by writing a 1 to a
register or setting a counter register to 0 for OUT or length for IN.)
The transmit buffer alignment is determined by `CFG_TUSB_MEM_ALIGN`.
One potential pitfall is that the buffer may be longer than the maximum endpoint size of one USB
packet. Some peripherals can handle transmitting multiple USB packets for a provided buffer (like the SAMD21).
Others (like the nRF52) may need each USB packet queued individually. To make this work you'll need to track