Free PIO SM on SerialPIO::end (#949)

earlephilhower · web-flow · commit 9b28fc3e179e · 2022-10-31T17:10:59.000-07:00
Fixes #945
diff --git a/cores/rp2040/SerialPIO.cpp b/cores/rp2040/SerialPIO.cpp
@@ -259,9 +259,11 @@ void SerialPIO::end() {
     }
     if (_tx != NOPIN) {
         pio_sm_set_enabled(_txPIO, _txSM, false);
+        pio_sm_unclaim(_txPIO, _txSM);
     }
     if (_rx != NOPIN) {
         pio_sm_set_enabled(_rxPIO, _rxSM, false);
+        pio_sm_unclaim(_rxPIO, _rxSM);
         _pioSP[pio_get_index(_rxPIO)][_rxSM] = nullptr;
         // If no more active, disable the IRQ
         auto pioNum = pio_get_index(_rxPIO);

Original file line number	Diff line number	Diff line change
`@@ -259,9 +259,11 @@ void SerialPIO::end() {`
`259`	`259`	`}`
`260`	`260`	`if (_tx != NOPIN) {`
`261`	`261`	`pio_sm_set_enabled(_txPIO, _txSM, false);`
	`262`	`+ pio_sm_unclaim(_txPIO, _txSM);`
`262`	`263`	`}`
`263`	`264`	`if (_rx != NOPIN) {`
`264`	`265`	`pio_sm_set_enabled(_rxPIO, _rxSM, false);`
	`266`	`+ pio_sm_unclaim(_rxPIO, _rxSM);`
`265`	`267`	`_pioSP[pio_get_index(_rxPIO)][_rxSM] = nullptr;`
`266`	`268`	`// If no more active, disable the IRQ`
`267`	`269`	`auto pioNum = pio_get_index(_rxPIO);`