Important changes to forums and questions
All forums and questions are now archived. To start a new conversation or read the latest updates go to forums.mbed.com.
5 years, 2 months ago.
How to enable specific UART pins?
Hi, I'm using seeedArchMax. It has STM32F407VET6 on it. In datasheet, it says, that there are USART3_TX and USART3_RX on pins PD8, PD9 as alternate function. But when I write Serial pc(PD_8, PD_9); it doesn't work. Can I somehow use UART on these pins exactly?
2 Answers
5 years, 2 months ago.
I see that in the master from Github that Seeed did not describe those pins as Serial. Take a look here. https://github.com/ARMmbed/mbed-os/blob/master/targets/TARGET_STM/TARGET_STM32F4/TARGET_STM32F407xE/TARGET_ARCH_MAX/PeripheralPins.c
You can always edit the repository and replace the mbed library with a custom version. In the Github source you will need to add the correct description for the pins on PD8/PD9 in order to use them. Perhaps raise this issue with Seeed Studio? They should update their repository entry.
5 years, 2 months ago.
Hi Alex,
Please refer to PinNames.h of Arch MAX here,
PD_8 and PD_9 are default used by LED, check if your configuration is overlapped, and try to use other GPIO if possible.
Regards, Desmond