QEI.rar_ qei_PIC_dsPIC33F编码器_dspic33f_qei

#include <p33FJ128MC710.h> #include "QEI.h" void OscConfig(void); void InitIOPort(void); /********************************************************************************* Configuration bits: _FOSCSEL: Start up with the FRC oscillator _FOSC: Use Primary oscillator XT with PLL, clock switching enabled _FWDT: Watch dog timer is off _FPOR: Power-on Reset Value disabled, Alternate I2C pins mapped to SDA1/SCL1 _FICD: JTAG is disabled, communicate on PGC2/EMUC2 and PGD2/EMUD2 for this board **********************************************************************************/ _FOSCSEL(FNOSC_FRC) _FOSC(FCKSM_CSECMD & OSCIOFNC_OFF & POSCMD_XT) _FWDT(FWDTEN_OFF) _FPOR(FPWRT_PWR1) _FICD(JTAGEN_OFF & ICS_PGD2) int main ( void ) { /* Configure Oscillator Clock Source */ OscConfig(); /* initialise other modules */ InitIOPort(); init_QEI(); while(1) ; } void OscConfig(void){ /* Configure Oscillator to operate the device at 40MIPS Fosc= Fin*M/(N1*N2), Fcy=Fosc/2 Fosc= 8M*40/(2*2)=80Mhz for 8M input clock */ PLLFBD=38; /* M=40 */ CLKDIVbits.PLLPOST=0; /* N1=2 */ CLKDIVbits.PLLPRE=0; /* N2=2 */ OSCTUN=0; /* Tune FRC oscillator, if FRC is used */ /* Disable Watch Dog Timer */ RCONbits.SWDTEN=0; /* Clock switch to incorporate PLL*/ __builtin_write_OSCCONH(0x03); // Initiate Clock Switch to Primary // Oscillator with PLL (NOSC=0b011) __builtin_write_OSCCONL(0x01); // Start clock switching while (OSCCONbits.COSC != 0b011); // Wait for Clock switch to occur /* Wait for PLL to lock */ while(OSCCONbits.LOCK!=1) {}; }//end void InitIOPort(void) { AD1PCFGH = 0xFFFF; AD1PCFGL = 0xFFFF; }//end