synchronous USART

artuom · ‎2014-08-19

Posted on August 19, 2014 at 16:38

Hi everyone.

I need to build a system based at STM32F4xx that use absolute encoder with BiSS protocol (http://www.biss-interface.com). This protocol is based at synchronous RS485. I have HW that convert differential signals to single ended.

There is an option to use USART in synchronous mode. I couldn't find where SCLK pin is placed. I guest that USARTx_CK is usart clock, but I'm not sure.

In general what do you suggest:

1. To use synchronous USART.

2. To SPI MISO &SCK.

Any way, in both configuration I'll need to make some bit shift operation to recognize the data.

Thanks in advance.

Tesla DeLorean · ‎2014-08-19

Posted on August 19, 2014 at 17:00

I'm hard pressed to see that working with a Synchronous USART, SPI perhaps, though you'd have to do some work to ensure the interface is left in a high state, and clocked continuously.

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artuom · ‎2014-08-21

Posted on August 21, 2014 at 14:56

Any way, thank for your reply.

Probably I'll make double layout (for USART and SPI) to receive the data.

When data is received, I'll will search for ''010'' bit sequence that represents some kind of header.

I'll see in future if this concept is working...