Re: [avrdude-dev] Programmer is not responding

[Joerg Wunsch]

As Henrik Brix Andersen wrote:

>         avrdude: serial_recv(): programmer is not responding
>         avrdude: stk500_recv(): programmer is not responding

Running it with -vvvv gives details about the communication.

My guess is that your PL2303 occasionally drops a character.
Unfortunately, the current STK500 code (both v1 and v2) doesn't
recover from that situation at all, i.e. it makes no retries.  It
shouldn't be to hard to add retries though.  In the jtag2 code (which
has partially been cloned from the stk500v2 code, as both low-level
protocols are similar to some degree), I had to add retries as some of
my tests have been run on a lossy PCI multiport card where my FreeBSD
driver randomly catches a `silo overflow' which means that some
character gets lost.

> It is connected to the host PC through a PL-2303 USB-to-RS232
> converter.

I just tried my STK500 behind a PL2303 adapter on FreeBSD (firmware
version 2, avrdude straight from CVS), and could not see any problems.
The data rate is not exciting though, but that could easily be a
latency problem with the uplcom driver here.

-- 
cheers, J"org               .-.-.   --... ...--   -.. .  DL8DTL

http://www.sax.de/~joerg/                        NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)