search

plusk01 / airdamon_f3

Be the Matt Damon of the skies
2 stars 1 forks source link

F4 USART gibberish #9

Closed plusk01 closed 5 years ago

plusk01 commented 5 years ago

Keep getting gibberish from revo/USART3.

image

Should be getting t (from stm32-playground).

plusk01 commented 5 years ago

Turns out that I was not setting the HSE_VALUE=8000000 define.

STM32F30x has 8 MHz default HSE crystal freq, while STM32F4xx has 25 MHz default (see system_stm32f30x.c vs system_stm32f4xx.c).