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patch #9328: ft245r.c: add TPI support (patches 5-7)

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Submitted by David Mosberger-Tang:
* ft245r.c (ft245r_set_bitclock): add workaround for
FT245 hardware bugs in bitclock setting

Correct baud rate calculation (multiplying with factor of 2 was wrong)
and add compile-time workaround for FTDI chips suffering for the
variable pulse-width errata.  The workaround entails always running
the chip at 3MHz and stuffing the channel with repeated bytes to
achieve the desired baudrate.

This has no effect on programming speed.  Note, however, that now a
baudrate option -b750000 has to be used to achieve maximum speed.

(Option enabled by default now.)



git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@1488 81a1dc3b-b13d-400b-aceb-764788c761c2
This commit is contained in:
Joerg Wunsch
2021-11-25 09:17:11 +00:00
parent 2015a874e0
commit 49e5f2451c
3 changed files with 61 additions and 18 deletions
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@@ -1,3 +1,10 @@
2021-11-25 Joerg Wunsch <j.gnu@uriah.heep.sax.de>
Submitted by David Mosberger-Tang:
patch #9328: ft245r.c: add TPI support (patches 5-7)
* ft245r.c (ft245r_set_bitclock): add workaround for
FT245 hardware bugs in bitclock setting
2021-11-25 Joerg Wunsch <j.gnu@uriah.heep.sax.de>
Submitted by David Mosberger-Tang: