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patch #9327: ft245r.c: add TPI support (patches 1-4) 

Submitted by David Mosberger-Tang

With newer versions of the Linux kernel (e.g., Ubuntu's
linux-image-4.4.0-75-generic), the default for the latency timer is
set to a high value.  Since this driver needs quick turnaround times,
set it explicitly to the minium.  This improves TPI programming speed
by almost a factor of 10.




git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@1484 81a1dc3b-b13d-400b-aceb-764788c761c2
This commit is contained in:
Joerg Wunsch 2021-11-24 22:00:45 +00:00
parent 6de6c0ffce
commit 7ff5652edc
2 changed files with 14 additions and 0 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2021-11-24 Joerg Wunsch <j.gnu@uriah.heep.sax.de>
Submitted by David Mosberger-Tang:
patch #9327: ft245r.c: add TPI support (patches 1-4)
* ft245r.c (ft245r_open): add call to
ftdi_set_latency_timer() to improve timing
2021-11-24 Joerg Wunsch <j.gnu@uriah.heep.sax.de>
Submitted by David Mosberger-Tang:

7
ft245r.c
View File

@ -836,6 +836,13 @@ static int ft245r_open(PROGRAMMER * pgm, char * port) {
ft245r_out = SET_BITS_0(ft245r_out,pgm,PIN_LED_VFY,0);
rv = ftdi_set_latency_timer(handle, 1);
if (rv) {
avrdude_message(MSG_INFO, "%s: unable to set latency timer to 1 (%s)\n",
progname, ftdi_get_error_string(handle));
goto cleanup;
}
rv = ftdi_set_bitmode(handle, ft245r_ddr, BITMODE_SYNCBB); // set Synchronous BitBang
if (rv) {
avrdude_message(MSG_INFO, "%s: Synchronous BitBangMode is not supported (%s)\n",