2022-06-21 05:14 AM
Hello,
I am trying to connect to my STM32F429I-DISC1 (E01 revision) board's USART1 on pins PA9 and PA10 using an FT2232HL as USART to USB interface.
I've seen in the user manual of the STM32F429I-DISC1 that the solder bridges SB11 and SB15 connecting ST-LINK to USART1 and enabling VCP where on by default.
I am wondering if this might prevent me from accessing USART1 via pins PA9 and PA10 and if I have to disable this solder bridges or if it has no incidence over it ?
Thank you.
Solved! Go to Solution.
2022-06-21 05:26 AM
You can have two receivers driven by one transmitter:
+---->Rx1 in
|
Tx Out--->+ This is OK
|
+---->Rx2 in
but you cannot short two transmitters together to drive one receiver:
Tx1 out---->+
|
+---->Rx in This is NOT OK
|
Tx2 out---->+
2022-06-21 05:26 AM
You can have two receivers driven by one transmitter:
+---->Rx1 in
|
Tx Out--->+ This is OK
|
+---->Rx2 in
but you cannot short two transmitters together to drive one receiver:
Tx1 out---->+
|
+---->Rx in This is NOT OK
|
Tx2 out---->+
2022-06-21 06:05 AM
Alright thank you. If I understand correctly this means that I have to disable the SB connecting Tx to st-link.
2022-06-21 06:13 AM
No.
The STM32 Tx output can go to both the ST-Link and the FTDI's Rx inputs.
It's the ST-Link's Tx output that you need to disconnect.
2022-06-21 06:16 AM
+---->ST-Link Rx in
|
STM32 Tx Out--->+
|
+---->FTDI Rx in
ST-Link Tx out----> disconnect!
+---->STM32 Rx in
|
FTDI Tx out---->+
2022-06-21 06:37 AM
Oops my mistake, I was thinking from the point of view of the st-link controller and replied too fast.
2022-06-21 07:26 AM
Nobody has ever got Tx and Rx the wrong way around before ...
:face_with_tears_of_joy: :grinning_face_with_sweat: :confounded_face:
If that's resolved the issue, please mark the solution