re-add erase, change Tone TC to TC3

Author: ladyada

cores/arduino/Tone.cpp

@@ -37,9 +37,9 @@ volatile bool toneIsActive = false;
 volatile bool firstTimeRunning = false;
 
 #if defined(__SAMD51__)
-#define TONE_TC         TC2
-#define TONE_TC_IRQn    TC2_IRQn
-#define TONE_TC_GCLK_ID	TC2_GCLK_ID
+#define TONE_TC         TC3
+#define TONE_TC_IRQn    TC3_IRQn
+#define TONE_TC_GCLK_ID	TC3_GCLK_ID
 #else
 #define TONE_TC         TC5
 #define TONE_TC_IRQn    TC5_IRQn

platform.txt

@@ -117,7 +117,7 @@ tools.bossac.cmd=bossac
 
 tools.bossac.upload.params.verbose=-i -d
 tools.bossac.upload.params.quiet=
-tools.bossac.upload.pattern="{path}/{cmd}" {upload.verbose} --port={serial.port.file} -U {upload.native_usb} -i -w -v "{build.path}/{build.project_name}.bin" -R
+tools.bossac.upload.pattern="{path}/{cmd}" {upload.verbose} --port={serial.port.file} -U {upload.native_usb} -i -e -w -v "{build.path}/{build.project_name}.bin" -R
 
 tools.bossac_remote.upload.pattern=/usr/bin/run-bossac {upload.verbose} --port=ttyATH0 -U {upload.native_usb} -e -w -v /tmp/sketch.bin -R