Code example for USART cts/rts on STM32F3Discovery?

[gbigden]

Posted on January 22, 2015 at 15:27

Does anyone have a code example for the setup of the STM32F3 Discovery board USART using CTS/RTS handshaking please?

#stm32 #discovery #usart

[Tesla DeLorean]

Posted on January 22, 2015 at 18:39

Setting the pins up is relatively trivial, but you don't mention specific pins or a USART.

CTS/RTS is more about a buffering strategy.

https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Flat.aspx?RootFolder=https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/stm32f2xx%20USART%20RTSCTS&FolderCTID=0x01200200770978C69A1141439FE559EB459D7580009C4E14902C3CDE46A77F0FFD06506F5B&currentviews=1708

[gbigden]

Posted on January 23, 2015 at 11:59

Thanks. The way I am doing things at present is to do most of my program under a timer interrupt and the rest, which is mainly RS232 processing, in a loop in main.c

I was assuming that cts/rts/ would be sufficient to stop the Rx buffer overflowing when connected to the other end (a PC). Is this not the case?

[Tesla DeLorean]

Posted on January 23, 2015 at 19:30

If the USART is not interrupting, then things are less complicated. If you leave data in the USART->DR (RX) it will signal the transmitter not to send any more. Similarly the TX side can be held off by the receiver. You can check the TXE flags and the CTS pin.