Multiple messages queuing for HAL_UART_Transmit_IT

[Michael Ruppe]

Posted on December 09, 2016 at 11:47The original post was too long to process during our migration. Please click on the attachment to read the original post.

[toby2]

Posted on December 24, 2016 at 17:44

I don't know if you sorted this but I made a thread recently which might help:

https://community.st.com/0D50X00009XkeYkSAJ

basically (looking at your short version only) HAL_UART_Transmit_IT() is not blocking so you are writing to buffer (the second sprintf) before the first lot of data is transmitted.

You have 3 options:

1. wait for the 1st transmission to finish before writing to the buffer,
2. set up a system where you either use separate buffers or unused parts of the buffer the 2nd time
3. don't user HAL as it is much simpler without