Re: [avrdude-dev] avrdude bitbang devices patch

[Ivan Shmakov]

>>>>> Joerg Wunsch <address@hidden> writes:
>>>>> As Joerg Wunsch wrote:

 >>> I'm not sure, but i believe that - unlike the parallel port code -
 >>> the serial bitbanging would also work on an USB attached serial
 >>> port.

 >> It might, but it's for sure yet even slower.

 > I tried it using a

 > ucom0: Prolific Technology PL2303 Serial adapter (ATEN/IOGEAR UC232A), rev 
 > 1.10/2.02, addr 3

 > It doesn't work, using a jumper between MISO and MOSI doesn't even
 > return the echo.  And as expected, it's *really* slow.

        … Given that USB to Serial adapters are now even cheaper than
        back in 2005, I've tried one more of them, now based on CP2103:

10c4:ea60 Cygnal Integrated Products, Inc. CP210x UART Bridge / myAVR 
mySmartUSB light

        Somewhat surprisingly, it worked, though it's indeed slow.  (I
        wonder if I'd have the patience to store a few KiB's in the
        MCU's memory.  I hope to re-check PL2303 sometime in the next
        month as well, as these seem to be much cheaper and easier to
        find than CP2103.)

        BTW, could the four dedicated GPIO pins of the chip be of some
        help?  As the programming interface is exactly four lines wide
        (including /RESET), we'd be able to leave the RS-232 lines for
        whatever other uses there may be.

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