I am frustrated!
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cdeb974109
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5c8e20e17d
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@ -10,21 +10,39 @@ Adafruit_MCP4728 mcp;
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#define nsamp 256
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#define nsamp 256
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#define dacmax 256
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#define dacmax 256
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const byte nclk=42; //number of clock cycles of the loop
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const byte nclk = 200; // a guess
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long int freq; //frequency in mHz
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long int freq; //frequency in Hz
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long unsigned int phase;
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long unsigned int phase;
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long unsigned int phase_inc;
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long unsigned int phase_inc;
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void setup() {
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void setup() {
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//TIMSK0 &= ~_BV(TOIE0); // disable timer0 overflow interrupt
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//Wire.setClock(1400000L); // wooooo
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// // Set a timer interrupt for the phase accumulation
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cli();//stop interrupts
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//set timer1 interrupt at 44Hz
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TCCR1A = 0;// set entire TCCR1A register to 0
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TCCR1B = 0;// same for TCCR1B
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TCNT1 = 0;//initialize counter value to 0
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// set compare match register for 1hz increments
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OCR1A = 500; // = (16 * 10**6) / (44000) - 1
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// turn on CTC mode
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TCCR1B |= (1 << WGM12);
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// Set CS10 and CS12 bits for 1024 prescaler
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TCCR1B |= (1 << CS12) | (1 << CS10);
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// enable timer compare interrupt
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TIMSK1 |= (1 << OCIE1A);
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sei();//allow interrupts
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Serial.begin(115200);
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Serial.begin(115200);
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while (!Serial)
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while (!Serial)
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delay(10); // will pause Zero, Leonardo, etc until serial console opens
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delay(10); // will pause Zero, Leonardo, etc until serial console opens
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// Try to initialize!
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// Try to initialize!
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if (!mcp.begin(0x64)) {
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if (!mcp.begin(0x64)) {
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Serial.println("Failed to find MCP4728 chip");
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Serial.println("Failed to find MCP4728 chip");
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while (1) {
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while (1) {
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@ -34,11 +52,11 @@ void setup() {
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Serial.println("Adafruit MCP4728 initialised");
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Serial.println("Adafruit MCP4728 initialised");
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}
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}
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Wire.setClock(3400000L);
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freq=660;
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freq=6600000;
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phase=0;
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phase=0;
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calc_phase_inc();
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calc_phase_inc();
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//phase_inc = 1;
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setwave();
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setwave();
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}
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}
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@ -52,10 +70,10 @@ void setwave(){
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int val=0;
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int val=0;
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//saw
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//saw
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val = dacmax * isamp / nsamp;
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//val = dacmax * isamp / nsamp;
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//val = ( isamp < nsamp / 2 ) ? 0 : dacmax - 1;
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//val = ( isamp < nsamp / 2 ) ? 0 : dacmax - 1;
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//sine
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//sine
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//val=(sin(phi)+1.0)*dacmax/2;
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val=(sin(phi)+1.0)*dacmax/2;
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//val=((sin(phi)+0.333*sin(3*phi))/0.943+1)*dacmax/2;
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//val=((sin(phi)+0.333*sin(3*phi))/0.943+1)*dacmax/2;
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val=max(val,0);
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val=max(val,0);
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@ -65,19 +83,21 @@ void setwave(){
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}
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}
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//calculate the phase increment. 2^32/16E6=268.435456
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//calculate the phase increment.
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void calc_phase_inc(){
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void calc_phase_inc(){
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phase_inc=0.268435456*nclk*freq;
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phase_inc=0.268435456*nclk*freq;
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Serial.println("phase inc");
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Serial.println(phase_inc);
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}
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}
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//regular running: generate waves
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ISR(TIMER1_COMPA_vect){// timer1 interrupt
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phase += phase_inc;
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}
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//regular running:
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void loop() {
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void loop() {
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//phase+=900;
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int redphase = phase >> 24;
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//int redphase = phase >> 24;
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mcp.fastWrite(waveform[redphase] << 4, 0, 0, 0);
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phase += analogRead(A0);
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//Serial.println(redphase);
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int redphase = phase % nsamp;
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mcp.fastWrite(waveform[redphase] << 4, 0, 0, 0);
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}
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}
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