add ADC DAC SysClock

libraries/ADC/_ADC_ .cpp

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+//_ADC_

libraries/ADC/_ADC_.h

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+//_ADC_

libraries/ADC/examples/adc_i2v56/adc_i2v56.ino

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+//============================================
+// ADC demo
+// Using new added internal 2.56V reference
+//============================================
+
+uint16_t value;
+
+void setup() {
+  // put your setup code here, to run once:
+  analogReference(INTERNAL2V56);
+
+  Serial.begin(19200);
+
+}
+
+void loop() {
+  // put your main code here, to run repeatedly:
+  value = analogRead(VCCM);
+
+  Serial.println(value);
+  delay(1);
+}

libraries/DAC/_DAC_.cpp

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+//_DAC_

libraries/DAC/_DAC_.h

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+//_DAC_

libraries/DAC/examples/dac0_ramp/dac0_ramp.ino

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+//============================================
+// DAC0 output demo 
+// DACO output ==> D4 on board
+//============================================
+
+unsigned char value = 0;
+
+void setup() {
+  // put your setup code here, to run once:
+  analogReference(INTERNAL2V56);
+  pinMode(4, ANALOG);
+
+  analogWrite(4, 255);
+}
+
+void loop() {
+  // put your main code here, to run repeatedly:
+  //analogWrite(4, value);
+  delay(10);
+  value += 10;
+}
+

libraries/SysClock/_sysclock_.cpp

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+//_sysclock_

libraries/SysClock/_sysclock_.h

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+//_sysclock_

libraries/SysClock/examples/sysclock/sysclock.ino

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+// demo for system clock switch
+// using function "sysClock(mode)" to switch
+// system clock between internal or external oscillator
+// e.g:
+//  sysClock(INT_OSC) for internal oscillator
+//  sysClock(EXT_OSC) for external crystal 
+
+void setup() {
+  // put your setup code here, to run once:
+  sysClock(EXT_OSC);
+
+  pinMode(LED_BUILTIN, OUTPUT);
+}
+
+void loop() {
+  // put your main code here, to run repeatedly:
+  digitalToggle(LED_BUILTIN);
+}