xuat 500xung PWM Tpwm=5khz
dear cac bac pro pic18 hien em dang thu lap trinh C18 xuat power PWM Tpwm=5Khz xuat 500 xung thi dung khong xuat nua nhung chua ranh chi lam duoc den day bac chi giup em voi
void Motor_init()
{
//------------------------ PTCON0: PWM TIMER CONTROL REGISTER 0 -----------------------------//
// Postscale: 1:1
PTCON0bits.PTOPS0 = 0;
PTCON0bits.PTOPS1 = 0;
PTCON0bits.PTOPS2 = 0;
PTCON0bits.PTOPS3 = 0;
// time base input clock: 1:4 prescale
PTCON0bits.PTCKPS0 = 0;
PTCON0bits.PTCKPS1 = 1;
// Free running mode
PTCON0bits.PTMOD0 = 0;
PTCON0bits.PTMOD1 = 0;
// PWM PERIOD FOR FREE-RUNNING MODE:
// Tpwm = ((PTPER + 1) x PTMRPS) / (Fosc/4).
//(Desired period) (Period value) (prescale value)
//------------------------ PTCON1: PWM TIMER CONTROL REGISTER 1 -----------------------------//
PTCON1bits.PTEN = 0; // PWM time base is off
//------------------------ PWMCON0: PWM CONTROL REGISTER 0 -----------------------------//
// PWM outputs: PWM0-PWM1-PWM2-PWM3
PWMCON0bits.PWMEN0 = 0;
PWMCON0bits.PWMEN1 = 1;
PWMCON0bits.PWMEN2 = 0;
// Config pair output:
PWMCON0bits.PMOD0 = 1; // pair (PWM0, PWM1) is in the Independent mode
PWMCON0bits.PMOD1 = 1; // pair (PWM2, PWM3) //
PWMCON0bits.PMOD2 = 1; // pair (PWM4, PWM5) //
PWMCON0bits.PMOD3 = 1; // pair (PWM6, PWM7) //
//------------------------ PWMCON1: PWM CONTROL REGISTER 1 -----------------------------//
// PWM Special Event Trigger: 1:1 postscale
PWMCON1bits.SEVOPS0 = 0;
PWMCON1bits.SEVOPS1 = 0;
PWMCON1bits.SEVOPS2 = 0;
PWMCON1bits.SEVOPS3 = 0;
PWMCON1bits.SEVTDIR = 0; // A Special Event Trigger will occur when the PWM time base is counting upwards
PWMCON1bits.UDIS = 0; // Updates from Duty Cycle and Period Buffer registers are enabled
PWMCON1bits.OSYNC = 0; // Output overrides via the OVDCON register are asynchronous
// Time base beginning value
PTMRL = 0;
PTMRH = 0;
// Period value: 249 <==> Tpwm = 5Khz
PTPERH = 0;
PTPERL = 0xF9;
// Max Duty cycle = Period value x 4.
PTCON1bits.PTEN = 1; // PWM time base is on
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