HTCC-AMO2 programming and debugging circuit

[c_zalinski]

I have purchased HTCC-AMO2 and designed and built a circuit board for a custom design.
I am wondering how to program and debug this device from the Arduino IDE.

I have wired RX1 and TX1 to support a USB to serial connection such as USB to TTL Serial 3.3V UART Converter Cable with FTDI Chip Terminated by 6 Way Header (you can search that on Amazon and see what I mean).

Will this just work? Should I have designed in the reset pin somewhere? I am hoping somebody can direct me or explain what is needed to program and debug this standalone device.

[piecol]

Hi,

indeed RESET and USR1 (GPIO16) pins are required to enter bootmode and program the AM02 module.

You will find relevant schematics design here:

HTCC-AM02_Reference_Design(Arduino).pdf

There is a convenient “autoboot” section that can be used to implement automatic RESET/USR1 procedure using RTS and DTR pins on the FTDI converter.
You can otherwise do it manually by including buttons for both RESET and USR1.

[TomStein]

As @piecol said you can use the referenced autoboot design. However, most FTDI USB Adapters only expose DTR and CTS pins along RX/TX, 3V3 and GND. Only a few additionally expose the required RTS pin. And if they do, they usually don’t do so on the 6 Way Header but instead on some pad on the PCB you can solder on. This makes using these Adapters for quickly connecting a custom board hard to use.

I wonder if there is a way to change the requirement from RTS to CTS in some way. I believe this is hard coded into the CubeCellelftool.

[piecol]

Yes, the pin order on serial bridges is not in favour of the RTS/DTR thing. But you can easily solder some wires to a 6pin header and you have your custom serial programmer at hand. Some heatshrinking tube would make it sturdier.

[rustyracer13]

I got this from AlexFR. I use a HiLetgo 2pcs CP2102 MICRO USB to UART TTL Module 6 Pin Serial Converter STC Replace FT232 to connect to this.

https://oshwlab.com/philscheiman/testhtccm02