dead bootloader??

[jsilva]

Hi there,

I have mounted a Vems in a car and  I've been trying to program the pic without success... here what happens:

- No matter what I try with megaloader and such, all the times programs says that Vems is not connected to my pc (when it is)

- Electric circuits have been checked more than twice, they are good to go (connection cables also)

- For some odd reason in the terminal program I can only communicate with Vems at the highest speed possible (if I do it at lower speed, no matter what keys I press they produce no result)

-The Spv test for some reason does not return what it was supposed to (it gives E0 00 00 values, instead of the supposed ones).

- another fact is, after Hyper Terminal connection, the output from the simple fact that I've connected to the Vems is, instead of normal chars, it appears a bunch of rectangles that end up with a triangle form in the top.


Is bootloader dead? Since I never programmed this Vems I have no idea of what is wrong here.

P.S: I'm not certain what firmware this Vems has, since I bought it 4 months ago and only now was needed...

[gunni]

You may want to take a look at this.
http://195.159.109.134/vemsuk/forum/index.php/topic,209.0.html

And basically re install the firmware you want to run, and upload or reconfigure the ecu if no data shows up after the firmware
upgrade.

[jsilva]

well, I tried that but doesn't seem to work...

Right now I am trying to get to some result with avrdude, but still nothing...

[jsilva]

I've already tried every possible solution for this: using both serial and ISP cable I got nothing from the Vems, absolutely no communication....
Tried every arvdude option and every tools available, nothing...


In other words, is the processor dead?

[gunni]

Have you tested the TX-RX trick with your serial port??

where you short the tx and rx wires without them being connected to any device, so when you send something from terminal, it shows up on your screen as a message TO you from a device.

This will verify that your serial communications are infact right.

[jsilva]

I tried that and works, awkwardly but it does.

With the vems turned off, it does send echo signal, but, with the vems turned on, it does not!

[gunni]

Can you verify that the vires are indeed getting to the chip on the board?

[jsilva]

Yes they are, as I said, every wire and connection has been checked more than twice