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STM32F429i-Discovery : USART issue & system_stm32f4xx.c

Question asked by Chromatik on Feb 12, 2014
Latest reply on Feb 14, 2014 by Clive One
Dear all,

I am using the STM32F429i-Discovery, and I experience some problems with UART communication: received symbols are differents from TX.
Discussing with some colleagues points out the baudrate might be in charge, so I have two options:
- using a scope to determine the real baudrate
- ensure the clock is correcly configured

For the second option, I was looking for the SystemInit and SystemCoreClock configuration. It seems the related file is system_stm32f4xx.c
In the differents example projects I noticed 2 versions of this file, one "20-September-2013" (ST lib V1.0.0), the other "11-November-2013" (ST lib V1.0.1).
For both of them,  "This file is customized to run on STM32F429I-DISCO board only
They are quite differents, for PLL_M, M P and Q.
I know the HSE_frequency is the crystal frequency (8MHz).
What should be the correct PLL values ?

Thanks & Regards