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Re: [avrdude-dev] Serial programming AVR with FTDI FT232BM Bit Bang Mode
From: |
Joerg Wunsch |
Subject: |
Re: [avrdude-dev] Serial programming AVR with FTDI FT232BM Bit Bang Mode |
Date: |
Sat, 13 Aug 2005 22:09:14 +0200 |
User-agent: |
Mutt/1.4.2.1i |
As Johnathan Corgan wrote:
> For normal operation, the FT232BM serial TXD and RXD are routed to
> the appropriate serial port pins on the ATMega8.
> For programming, I have routed four pins from the FT232BM to RESET,
> MISO, MOSI, and SCLK, so I can use the bit bang mode of the part for
> programming operations.
Curious, I'd assume bit-banging across USB to be really slow. It's
already really slow on a standard serial port, but for USB, each bit
change will require a USB packet of its own. Why not simply use a
bootloader?
> Suggestions?
My only concern for AVRDUDE would be that there's currently no
infrastructure to maintain separate device drivers as part of the
project. (There's giveio.sys for the Win32 parallel-port bit-banging,
but that's quite different.)
--
cheers, J"org .-.-. --... ...-- -.. . DL8DTL
http://www.sax.de/~joerg/ NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)