[avrdude-dev] [bug #47890] ft232r serial dongle connected to ponyser interface

[Christian Mueller]

Follow-up Comment #1, bug #47890 (project avrdude):

Just got myself a small logic analyzer so I could watch the signals in
relation to each other and it turned out I had the reset pin wrong. The
following definition now works fine with rates up to 4000 bits/s (-b 4000):


# ponyser serial design with FT232R-based USB/RS232 adapter
programmer
  id    = "ponyser-ft232r";
  desc  = "ponyser serial design, using FT232R Synchronous BitBang";
  type  = "ftdi_syncbb";
  connection_type = usb;
  miso  = ~3;  # CTS
  sck   = ~2;  # RTS
  mosi  = ~4;  # DTR
  reset = 0;   # TXD
;


4000 bits/s is not exactly fast but it makes using an FT232R-based USB/RS232
dongle a usable option - without that, it would take some 40 minutes to write
8K of flash. The evaluation board I'm using also adds to this because it has
multiple sockets wired in parallel for various chips which adds to the load
applied to the RS232 level boost chip. A more direct connection might be a lot
faster.

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