5 years, 8 months ago.

I can't get the example to work

I have tried measuring Usart2 Tx pin but nothing seems to happen. Is there any additional dependency that I am missing? Any other suggestions?

Question relating to:

mbed library for using USART DMA in STM32F401RE. DMA, f401, F401RE, stm32f401

1 Answer

5 years, 6 months ago.

I'm sorry for be late to answer. I have not looked mbed site for some months.

Usart2 TX and Usart2 RX are not used and they don't output in mbed STM32F401RE. That's because they are connected to inside circuit. And the inside circuit are connected to usb port. I have been pestered with your problem before too.

You can look data in terminal software. For example "Tera Term".

If your want to connect except pc, you have to change "Init()" function. You should look at table 28 in STM32F401 reference manual.