STM32 FIFO depth

[mdeneen]

Posted on July 31, 2009 at 15:09

STM32 FIFO depth

[mdeneen]

Posted on May 17, 2011 at 13:19

How deep is the USART FIFO on the STM32 micros? The documentation suggests one byte, but it feels like more than that from testing.

[mdeneen]

Posted on May 17, 2011 at 13:19

I must be doing something wrong then. I'm using a rs485 transceiver, so I rx what I tx. If I disable the 485 driver after the last TXE interrupt, I never receive the last few (3) characters. If there were no FIFO, I would expect not to receive just the last character as it was in the shift register while the driverwas disabled.

I trust you but, like I said, I must be doing something wrong.

[ This message was edited by: mdeneen on 31-07-2009 18:43 ]

[16-32micros]

Posted on May 17, 2011 at 13:19

Hi,

We do not have FIFOs in our STM32F10xx USART, However we have DMA as an efficient alternative for Data movements and without CPU usage instead of FIFOs : I highly suggest you to have a look at this App Note

http://www.st.com/stonline/products/literature/an/13529.pdf

Cheers,

STOne-32.