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syifnrl
Associate II
July 4, 2023
Solved

stm32f407vgt6 problem with UART

  • July 4, 2023
  • 1 reply
  • 1723 views

I have stm32f407vgt6 from devebox. At first, I wanted to do led blink and it worked fine when I supplied it with external power via 5V pins. Then, when I tried to use UART pin (PA_9, PA_10) to print something to USB to TTL module, it did nothing. UART pins only work when I connected micro USB on stm32f407vgt6. Does anyone know how to solve this?

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Best answer by JTP1

Hello. How do you feed the power when using UART without usb connection ? Is your ground missing from mcu to ttl/usb converter ?

1 reply

J
JTP1Best answer
Graduate II
July 4, 2023

Hello. How do you feed the power when using UART without usb connection ? Is your ground missing from mcu to ttl/usb converter ?

S
syifnrlAuthor
Associate II
July 4, 2023

I supply my stm through 5v pin and gnd pin from my 12v lipo battery, equipped with step down converter. Then, I only connect PA9 and PA10 to my USB to TTL module (I use CP2102 USB to TTL module from waveshare).

J
JTP1
Graduate II
July 4, 2023

Ok. Note that you also need gnd to usb/ttl module :thumbs_up: sounds that its missing if communication works after you connect another usb cable from pc to micro usb which connects pc gnd to mcu gnd.

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