LGT8F328P DAC Sinewave 

//--------------------------

// Output sine wave

 

 

#define PI 3.1415926535897932384626433832795    //Define the constant π 

 

void setup() {

 

  pinMode(4, ANALOG);     //Configure the DAC output 

  analogReference(INTERNAL4V096);   //Internal reference source 4.096V 

}

 

void loop() 

{

 for(float i=0;i<=2;i=i+0.01)    //The starting point is 0, the termination is 2π, and the sampling rate is 0.01 

 {

  float rad=PI*i;    

  float Sin=sin(rad);

  long intSin=Sin*300;    //amplify the data by 300 times, take the integer 

  byte val=map(intSin,-300,300,0,255);   // map to 8 bits DAC precision 

  analogWrite(4, val);   //DAC output

  }

}

//----------------------------------

LGT8F328P (QFP32L) TEST
I/O D20/D21/D22/D23/D26 (output mode)

/*

 LGT8F328P QFP32L

 TEST OUTPUT mode

 LG8F328P | Arduino PIN

 PE0/SWC  | D22

 PE1/ADC6 | D20

 PE6/AVERF| D26

 PE2/SWD  | D23

 PE3/ADC7 | D21

*/  

// the setup function runs once when you press reset or power the board

#define LED_BUILTIN D13

void setup() {

  // initialize digital pin LED_BUILTIN as an output.

  pinMode(LED_BUILTIN, OUTPUT);  // PB5      | D13

  pinMode(D20, OUTPUT);  // PE1/ADC6 | D20

  pinMode(D21, OUTPUT);  // PE3/ADC7 | D21

  pinMode(D22, OUTPUT);  // PE0/SWC  | D22

  pinMode(D23, OUTPUT);  // PE2/SWD  | D23

  pinMode(D26, OUTPUT);  // PE6/AVERF| D26

}

// the loop function runs over and over again forever

void loop() {

  digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)

  digitalWrite(D20, HIGH);

  digitalWrite(D21, HIGH);

  digitalWrite(D22, HIGH);

  digitalWrite(D23, HIGH);

  digitalWrite(D26, HIGH);

  delay(1000);                       // wait for a second

  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW

  digitalWrite(D20, LOW);

  digitalWrite(D21, LOW);

  digitalWrite(D22, LOW);

  digitalWrite(D23, LOW);

  digitalWrite(D26, LOW);

  delay(1000);                       // wait for a second

}