The example shows the realization of continuously varying pulse width modulation (PWM). The continously modulated output is on the PORTE.0 pin which is monitored by a LED diode. The realization is carried out by using the mikroC compiler for dsPIC30F microcontrollers. Fig. 13-6 shows the electric diagram of the realized continuous PWM of a LED diode connected to PORTE.0.
Fig. 13-6 The electric diagram of the realized continuous PWM of a LED diode connected to PORTE.0.
unsigned int i;
unsigned int duty_50;
ADPCFG = 0xFFFF;
PORTB = 0xAAAA;
TRISB = 0;
duty_50 = Pwm_Mc_Init(5000,1,0x01,0); // Pwm_Mc_Init returns 50% of the duty
Pwm_Mc_Set_Duty(i = duty_50,1);
if (i == 0)
i = duty_50 * 2 - 1; // Let us not allow overflow
PORTB = i;