Unbreak FreeRTOS (#1193)

earlephilhower · web-flow · commit 36e0b4a908dd · 2023-02-15T12:10:52.000-08:00
USB changes caused FreeRTOS to not be able to swap tasks when the Serial port
was connected.  Clear the "stop PendSV" flag after checking for reset signal.
diff --git a/cores/rp2040/SerialUSB.cpp b/cores/rp2040/SerialUSB.cpp
@@ -190,6 +190,7 @@ static void CheckSerialReset() {
         reset_usb_boot(0, 0);
         while (1); // WDT will fire here
     }
+    __holdUpPendSV = 0;
 }
 
 extern "C" void tud_cdc_line_state_cb(uint8_t itf, bool dtr, bool rts) {

Original file line number	Diff line number	Diff line change
`@@ -190,6 +190,7 @@ static void CheckSerialReset() {`
`190`	`190`	`reset_usb_boot(0, 0);`
`191`	`191`	`while (1); // WDT will fire here`
`192`	`192`	`}`
	`193`	`+ __holdUpPendSV = 0;`
`193`	`194`	`}`
`194`	`195`
`195`	`196`	`extern "C" void tud_cdc_line_state_cb(uint8_t itf, bool dtr, bool rts) {`