atmel-samd: Reset TCC channel in use array on reset.

tannewt · tannewt · commit 3658c9227081 · 2017-06-09T17:15:31.000-07:00
This fixes spurious "All timers in use" exceptions. Thanks to @ladyada for finding this issue.
diff --git a/atmel-samd/common-hal/pulseio/PWMOut.c b/atmel-samd/common-hal/pulseio/PWMOut.c
@@ -64,6 +64,12 @@ void pwmout_reset(void) {
             while (tccs[i]->SYNCBUSY.bit.ENABLE == 1) {
             }
         }
+        // TODO(tannewt): Make this depend on the CMSIS.
+        if (i == 0) {
+            tcc_channels[i] = 0xf0;
+        } else {
+            tcc_channels[i] = 0xfc;
+        }
         tccs[i]->CTRLA.bit.SWRST = 1;
     }
     Tc *tcs[TC_INST_NUM] = TC_INSTS;

Original file line number	Diff line number	Diff line change
`@@ -64,6 +64,12 @@ void pwmout_reset(void) {`
`64`	`64`	`while (tccs[i]->SYNCBUSY.bit.ENABLE == 1) {`
`65`	`65`	`}`
`66`	`66`	`}`
	`67`	`+ // TODO(tannewt): Make this depend on the CMSIS.`
	`68`	`+ if (i == 0) {`
	`69`	`+ tcc_channels[i] = 0xf0;`
	`70`	`+ } else {`
	`71`	`+ tcc_channels[i] = 0xfc;`
	`72`	`+ }`
`67`	`73`	`tccs[i]->CTRLA.bit.SWRST = 1;`
`68`	`74`	`}`
`69`	`75`	`Tc *tcs[TC_INST_NUM] = TC_INSTS;`