I have a STM32H743I-EVAL kit. I'm successfully using I2C1 and I2C2, but I fail to set up I2C4 to transmit as master. (Timeout, waiting for TXIS flag) Any hints on what to check?

[fbackvid]

..

[Tesla DeLorean]

I guess I'd start by checking the schematic and pin usage, and whether you need to modify solder bridges or swap resistors to remove board or connector level conflicts.​