RS485 examples?

Discussion around product based on ARM Cortex M4 core.

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dombrowski@advantor.com
Posts: 4
Joined: Fri Jan 30, 2015 11:58 pm

RS485 examples?

Sat Jan 31, 2015 12:09 am

I'm using a sam4E8E and I chose it because it has a Hardware RS485 implementation built in. How ever I can't seam to get it to work nor can my local rep.

I"m looking to use the 4L as a slave and just for simplicity sake I want it just to echo any char it receives back down the USART1 that is setup in RS485 mode. So receive char from RS485 master on USART1. Toggle flow control from receive to send and then retransmit char back to master. I'm quite familiar with RS485 and use it in many products so I'm 99% confident it's not a hardware issue. I can't get the USART1 to show me any data nor toggle the Flow control pins when I look at all the pins on a logic analyzer.

Does anyone have a simple RS485 implementation they can share with me? Thanks in advance.

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