/* QR (Quadrature Register) */

/* Select QR */

#define QR(arg) (arg | 0xC0)

/* Enable x4 Quadrature Mode */

#define En_x4QM 0x03

/* Enable x2 Quadrature Mode */

#define En_x2QM 0x02

/* Enable x1 Quadrature Mode */

#define En_x1QM 0x01

/* Disable Quadrature Mode */

#define Dis_QM 0x00

/************************************************************************/

/* Initialize 7166 */

void Init_7166(int Addr)

/* Initialize 7166 as follows

Do a Master Reset

Set ICR as follows

Set Input A = Up Count

Set Input B = Down Count

Disable Inputs A/B

Enable Reset_CNTR input

Enable Load_CNTR input

Set OCCR – Normal Count Mode

Disable QM

Enable A and B Inputs

*/

void Init_7166(int Addr){

/* Master Reset */

outp(CTRLMODE(Addr), MCR(Rst_Master));

/* Set ICR */

outp(CTRLMODE(Addr), ICR(AUP_BDN + DisAB + RCNTR + LCNTR));

/* Set OCCR */

outp(CTRLMODE(Addr), OCCR(Nrml_Cnt));

/* Set QR */

outp(CTRLMODE(Addr), QR( Dis_QM));

/*Enable A and B inputs */

outp(CTRLMODE(Addr), ICR(EnAB));

}

7166-081507-18