void InitRegisters() { PORTA = 0; ANSELA = 0; TRISA = 0; OSCCON = 0b1000; // run internal oscillator at 31kHz LF FVRCON = 0b10001000; // enable fixed voltage reference for DAC, set gain = 2 to give a ref volt of 2.048V } void main() { InitRegisters(); DACCON0 = 0b10101000; // DAC enabled, DAC output available on DACOUT pin, FVR as positive voltage source DACCON1 = 0x1F; while(1) { while (DACCON1-- >1); // go from DACCON1 = 31 to DACCON1 = 0 while (DACCON1++ < 30); // go from DACCON1 = 1 to DACCON1 = 31 } }
And here are the oscilloscope readings:
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