Shop OBEX P1 Docs P2 Docs Learn Events
help propeller tool cant find propeller chip? — Parallax Forums

help propeller tool cant find propeller chip?

purplemonkeypurplemonkey Posts: 89
edited 2012-07-09 03:55 in Propeller 1
I bought this item from ebay as a cheap alternative to the prop plug as they were sold out at the time. Can you guys advise me as to how to get this working?

http://www.ebay.co.uk/itm/USB-2-0-to-UART-TTL-6Pin-COM-Module-Converter-Adapter-CP2102-Chip-with-Cable-New-/271010411682?pt=UK_Computing_Parallel_Serial_PS_2&hash=item3f197ab4a2

but i can't seem to get it to work the computer (windows 7 or osx 10.6 with brians tool) sees the usb to uart and loads the silicon drivers but propeller tool just can't find the propeller chip on port com3. Its driving me nuts. My circuit is just the default circuit listed in the datasheet

YAAAAASUVORK5CYII=
propellerdatasheet-v12.jpg


Any ideas would be greatly appreciated!
propellerdatasheet-v12.jpg
1024 x 1326 - 104K

Comments

  • Mike GreenMike Green Posts: 23,101
    edited 2012-07-08 06:34
    It's impossible to tell with the information you've provided, but I suspect that the problem is with the RST signal. The Propeller Tool expects that the virtual serial port's DTR signal is used for RST and that RST goes low for a brief time when DTR is activated. The description of the adapter doesn't say what RST does or what serial signal line it uses. If you're lucky, you might just need a transistor inverter. You could try measuring the voltage on RST without a serial port open, then see what happens when you open a serial port.
  • Duane DegnDuane Degn Posts: 10,588
    edited 2012-07-08 06:47
    I think it's likely you'll be able to use your alternative "Prop Plug".

    Someone on the forum has provided instructions on what changes you'll need to make. It might require a transistor as Mike suggested.

    I don't have time to find the link now. I'll look for it later if you still need it. I might have a link to the instructions in my index (see signature), but I'm not sure.
  • purplemonkeypurplemonkey Posts: 89
    edited 2012-07-08 06:52
    Thanks. As I'm a newbie at this can you tell me how I close the port and open it?
  • Duane DegnDuane Degn Posts: 10,588
    edited 2012-07-08 06:54
    I'm not sure if this is the only thread discussing this or not.

    http://forums.parallax.com/showthread.php?133335-Cheap-PropPlug-replacement-USB-TTL-converter-US-4.60-and-a-modification
  • pik33pik33 Posts: 2,367
    edited 2012-07-08 08:28
    Try BST instead of Propeller Tool. It is some chance this plug will work with it. If not, there are some threads like this linked in post #5 about how to get it working.
  • purplemonkeypurplemonkey Posts: 89
    edited 2012-07-08 08:36
    Yeah ive tried BST that didn't work either. What is the difference between The command line compiler and The command line loader which one should i use to connect to the propeller chip?
  • pik33pik33 Posts: 2,367
    edited 2012-07-08 09:02
    You only need the BST IDE. And if it cannot see a propeller, you have to modify the plug as described.
  • purplemonkeypurplemonkey Posts: 89
    edited 2012-07-09 03:55
    do i definitely need to add a transistor, capacitor and resistor?
Sign In or Register to comment.