Generic function enabling external programming on TPI devices. This
function sets the required guard time (which is passed in as parameter),
checks the TPI identification register, writes SKEY command + SKEY, and
finally polls the NVMEN bit in TPISR.
avr.h: Add prototype definitions of avr_tpi_program_enable() and
avr_tpi_chip_erase().
avrftdi_tpi.c: Removes tpi_skey_cmd array, containing the SKEY command
and the SKEY bytes.
tpi.h: Adds tpi_skey_cmd array, containing the SKEY command and the SKEY
bytes, but in the reverse order of tpi_skey.
git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@1167 81a1dc3b-b13d-400b-aceb-764788c761c2
This is not necessary any more, because the "frame" ends in logic 1, so
the pin is high anyway and the MPSSE keeps the pin value as long as it
is idle. Setting the pin low would cause the TPI physical layer in the
AVR part to detect a collision.
git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@1159 81a1dc3b-b13d-400b-aceb-764788c761c2
All I/O of avrftdi_tpi is done in terms of pgm->cmd_tpi() calls instead
of calling avrftdi_tpi_[read,write]_byte() functions directly.
git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@1158 81a1dc3b-b13d-400b-aceb-764788c761c2
avrftdi_private.h, avrftdi.c: remove pdata->guard_bits refernces, since
they are no longer needed
avrftdi_tpi.c: Use fixed guard time of 2 bits, this gives 16 bits per
frame. tpi_byte2frame() and tpi_frame2byte() functions are now
symmetrical and extraction of received data in avrftdi_read_byte is less
complicted. Write the new guard time to the TPI in
avrftdi_tpi_program_enable().
git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@1150 81a1dc3b-b13d-400b-aceb-764788c761c2
In this function the NVM enable bit in TPISR is written to zero, like
described in AVR918. The reset line is released in avrftdi_close().
git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@1149 81a1dc3b-b13d-400b-aceb-764788c761c2
Device identification is possible tested under OS X 10.6.8 with an
FT4232H and ATtiny10.
git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@1145 81a1dc3b-b13d-400b-aceb-764788c761c2
Hannes Weisbach