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icestorm
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Added code to restore the original timer latency. In this way the user can avoid 500 Hz interrupts.

This commit is contained in:
Salvador E. Tropea 2017-05-03 10:25:09 -03:00
parent 73fffc21fa
commit 05f0f33c1c
1 changed files with 15 additions and 1 deletions
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16
iceprog/iceprog.c
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@ -38,6 +38,8 @@
struct ftdi_context ftdic;
bool ftdic_open = false;
bool verbose = false;
bool ftdic_latency_set = false;
unsigned char ftdi_latency;
void check_rx()
{
@ -53,8 +55,11 @@ void error()
{
check_rx();
fprintf(stderr, "ABORT.\n");
if (ftdic_open)
if (ftdic_open) {
if (ftdic_latency_set)
ftdi_set_latency_timer(&ftdic, ftdi_latency);
ftdi_usb_close(&ftdic);
}
ftdi_deinit(&ftdic);
exit(1);
}
@ -454,11 +459,19 @@ int main(int argc, char **argv)
error();
}
if (ftdi_get_latency_timer(&ftdic, &ftdi_latency) < 0) {
fprintf(stderr, "Failed to get latency timer (%s).\n", ftdi_get_error_string(&ftdic));
error();
}
/* 2 is the ideal value, it means 500 Hz polling */
if (ftdi_set_latency_timer(&ftdic, 2) < 0) {
fprintf(stderr, "Failed to set latency timer (%s).\n", ftdi_get_error_string(&ftdic));
error();
}
ftdic_latency_set = true;
if (ftdi_set_bitmode(&ftdic, 0xff, BITMODE_MPSSE) < 0) {
fprintf(stderr, "Failed set BITMODE_MPSSE on iCE FTDI USB device.\n");
error();
@ -697,6 +710,7 @@ int main(int argc, char **argv)
// ---------------------------------------------------------
fprintf(stderr, "Bye.\n");
ftdi_set_latency_timer(&ftdic, ftdi_latency);
ftdi_disable_bitbang(&ftdic);
ftdi_usb_close(&ftdic);
ftdi_deinit(&ftdic);