USB<>FTDI ..... Hacking a £2 module to bring out DTR signal for Boot-Loader
Here is a simple Hack to use a USB<>FTDI module for mcu programming.
Most MCU chips require a reset signal to Shout the "Boot-Loader" into action and download code.
This one i am using on a really bare bone propellor board.....
Here is my £2 module :-
Please note and be careful to check the "RESET" pin when buying these cheap modules
......as this is not the reset line that goes to your MCU, this is often a trap easily fallen into.
You need to bring out the DTR signal.... some modules have this presented but not connected.
I am using the CP2102 chip set and the DTR is Pin 28
All you need to do is solder a small wire to this and attach a 0.1uf capacitor (104 type) from it to a spare pin.
I choose to use the original Reset pin of the module which required a track cut.
Testing ......... on my beloved Propellor board ..... Bingo