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TMS320F28075: RS485 interface on SCI

Part Number: TMS320F28075
Other Parts Discussed in Thread: C2000WARE

Using C2000Ware example codes, we implemented some full duplex RS422 and RS232 protocols that employs Interrupt and FIFO to minimize microcontroller load and improve response time.

For RS485 case I can not figure out how to efficiently handle the port direction pin that is connected to a GPIO with minimum microcontroller load when interrupt and FIFO are enabled for SCI interface.

  1. Is there any feature in SCI interface to automatically handle RS485 direction?
  2. Is there any software trick or technic to do that while FIFO and interrupt are enabled without polling TXEMPTY flag?

With regards,

Hossein