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pferd
pferd
Associate II
September 24, 2020
Question

Problem with baud rate 19200 on STM32F0.

  • September 24, 2020
  • 3 replies
  • 1065 views

Hello

I have the problem with USART baud rate in STM32F09x. I want to use baud rate: 9600, 19200, 38400, 57600, 115200bps with data length - 8 bits, parity and one stop bit. 

I can connect to the device at all speeds except 19200.

Microcontroller uses HSI 48 MHz clock.

Where is the problem ?

Thank you for help.

This topic has been closed for replies.

3 replies

Tesla DeLorean
Tesla DeLorean
Guru
September 24, 2020

>>Where is the problem ?

 Put a scope on it and tell us.

8-bit with parity is programmed as 9-bit, 19200 baud should be a clean divide of 48 MHz

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waclawek.jan
waclawek.jan
Super User
September 24, 2020

> I can connect to the device at all speeds except 19200.

How exactly does "can not connect" exhibit itself?

Note, that HSI is +-1% only at 25 deg.C and VDDA = 3.3 V. Also, some Cube incarnations on some families tend to spoil the internal RC oscillators trim, so check RCC_CR.HSITRIM.

JW

pferd
pferdAuthor
Associate II
September 25, 2020

Hello,

I am testing transmission and I have noise error for 19200 speed in receive mode. I used 2 diffrent master and I have this error in my microcontroller. It works as a slave.

Pferd

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