2018-04-10 09:49 PM
I am using STM32L072 on my custom board. I connected DP DM pins on USB connector directly to the DP DM pins on the MCU. I was hoping it gives me a DEBUG UART but it didn't work that way. What could be the problem?
Solved! Go to Solution.
2018-04-11 01:03 AM
Ok, so unless you software implements a USB device the pins will do nothing. With BOOT0 pulled High it should come up as a USB DFU device if I'm looking at the right App Note.
The Debug UART of the DISCO/NUCLEO boards comes from the ST-LINK device
2018-04-10 10:13 PM
Did you load any software onto the part? Is BOOT0 pulled HIGH?
Check VDDA and NRST levels.
2018-04-11 12:59 AM
I flashed a 'HELLO WORLD' firmware which prints HELLO WORLD on UART. The boot0 pin is not pulled HIGH.
2018-04-11 01:03 AM
Ok, so unless you software implements a USB device the pins will do nothing. With BOOT0 pulled High it should come up as a USB DFU device if I'm looking at the right App Note.
The Debug UART of the DISCO/NUCLEO boards comes from the ST-LINK device