basic comparator operation - output comparison on COMP1OUT

Hi,

I would like to perform a comparison between a 40kHz sinusoidal signal offset by 1.65V with a 1.65V DC signal. -> This means a zero crossing.

I want to output the result of the comparison on the COMP1OUT pin.

Below is the initialization of the comparator. I used a DACVAL for the reference signal 1.65V -> 512.

In the gpio init file, gpio1 is configured to be COMP1OUT (3)

the aio initialization is also ok.

I cannot observe any state change on the gpio1. Is there something else to do to connect the ouput of the comparator to the COMP1OUT pin ?

Thanks !

// Initialize Comp:
 EALLOW;
 SysCtrlRegs.PCLKCR0.bit.ADCENCLK = 1;                 // Enable Clock to the ADC
 AdcRegs.ADCCTL1.bit.ADCBGPWD = 1;                     // Comparator shares the internal BG reference of the ADC, must be powered even if ADC is unused

 SysCtrlRegs.PCLKCR3.bit.COMP1ENCLK = 1;               // Enable clock to the Comparator 1 block
 Comp1Regs.COMPCTL.bit.QUALSEL = 0;                    // Syncrhonized value is passed through
 Comp1Regs.COMPCTL.bit.SYNCSEL = 0;                    // Asynchronous
 Comp1Regs.COMPCTL.bit.CMPINV = 0;                     // Not inverted
 Comp1Regs.COMPCTL.bit.COMPDACEN = 1;                  // Power up Comparator 1 locally

Comp1Regs.DACVAL.all = 512;           
 Comp1Regs.COMPCTL.bit.COMPSOURCE = 0;