Wiki: Circuit Mod Diagram Error

[PatrickECleary]

Hi y'all 👋🏼

I found an error on the Wiki article "The Miditech Midiplus 4x4 hack and STM32Duino".

The [RST] callout in the fifth image down is pointing to the [+3.3V] line coming from the LDO, not the [RST] pin.

It looks like R26 is a pull-up resistor. In that image, the top of R26 is [3v3] and the bottom is [RST]. Note that its neighbor C16 is decoupling [RST] with respect to ground.

Although this wiring may be working for folks, it's bad practice and should be corrected. While I haven't tested it, I'm guessing that the reset pulse sent by the TTL-to-serial converter may be sufficiently brief to pull the LDO output low enough that the uC resets. However this shorts the LDO output to ground through the TTL-to-serial converter every time.

Thanks for your work, TheKikGen team! This project writeup is fantastic 🙏🏼

[TheKikGen]

Thanks Patrick. You are right. RST is at the bottom of R26.

You can also find a RST at the CN1 connector (not soldered) being a JTAG/SWD you can use with a STLINK stick.