Merge pull request arduino#70 from adafruit/dm-hallowing-pwm

fix pwm for m0

Author: deanm1278

cores/arduino/wiring_analog.c

@@ -368,10 +368,11 @@ void analogWrite(uint32_t pin, uint32_t value)
 	    if (pin == PIN_A0) { // Only 1 DAC on A0 (PA02)
 #endif
 
-	    	value = mapResolution(value, _writeResolution, _dacResolution);
-
 #if defined(__SAMD51__)
 
+	    value = mapResolution(value, _writeResolution, _dacResolution);
+
+
 			uint8_t channel = (pin == PIN_A0 ? 0 : 1);
 
 			pinPeripheral(pin, PIO_ANALOG);
@@ -557,7 +558,6 @@ void analogWrite(uint32_t pin, uint32_t value)
 
 	    if (!tcEnabled[tcNum]) {
 	      tcEnabled[tcNum] = true;
-	      value = mapResolution(value, _writeResolution, 16);
 		  uint16_t GCLK_CLKCTRL_IDs[] = {
 			GCLK_CLKCTRL_ID(GCM_TCC0_TCC1), // TCC0
 			GCLK_CLKCTRL_ID(GCM_TCC0_TCC1), // TCC1