djsundog/circuitpython
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

atmel-samd: Set up the tcc_instance when using an already active TCC.

Browse Source 
This fixes a hard lock that happens when using a second channel on an
in use TCC. The lock occurred when setting the duty cycle on the channel
because the hw address was not available to ASF.

Thanks to @ladyada for finding the bug.
This commit is contained in:
Scott Shawcroft 2017-06-09 17:16:33 -07:00
parent 3658c92270
commit 736a63e85a
1 changed files with 4 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
atmel-samd/common-hal/pulseio/PWMOut.c
View File

@ -128,6 +128,8 @@ void common_hal_pulseio_pwmout_construct(pulseio_pwmout_obj_t* self,
channel_ok(&pin->primary_timer, primary_timer_index)) {
t = &pin->primary_timer;
index = primary_timer_index;
self->tcc_instance.hw = t->tcc;
self->tcc_instance.double_buffering_enabled = true;
} else if (!variable_frequency &&
secondary_timer_index != 0xff &&
target_timer_frequencies[secondary_timer_index] == frequency &&
@ -135,6 +137,8 @@ void common_hal_pulseio_pwmout_construct(pulseio_pwmout_obj_t* self,
channel_ok(&pin->secondary_timer, secondary_timer_index)) {
t = &pin->secondary_timer;
index = secondary_timer_index;
self->tcc_instance.hw = t->tcc;
self->tcc_instance.double_buffering_enabled = true;
} else {
// Pick an unused timer if available.