DC Motor.rar

/* ** DC motor interfaced at CN7 ** P0.6 -> GPIO ** P0.7 -> PWM2 */ #include <lpc214x.h> #define CLOCKWISE 1 #define ANTICLOCKWISE 2 unsigned int period; void PWM_init(void) { period = 10000; PINSEL0 &= 0xFFFF0FFF; /* P0.6 as GPIO */ PINSEL0 |= 0x00008000; /* P0.7 as PWM2 */ IODIR0 |= 0x00000040; /* P0.6 as output */ IOCLR0 = 0x00000040; /* P0.6 = 1 */ PWMPR = 0x16; PWMMCR = 0x00000002; PWMPCR = 0x00000400; PWMMR0 = period; PWMMR2 = period/2; PWMLER = 0x05; PWMTCR = 0x00000009; /* Enable PWM and TC */ } void PWM_SetDutyCycle(unsigned char dir, unsigned int dc) { switch(dir) { case CLOCKWISE: IOCLR0 = 0x00000040; PWMMR2 = (period/100)*dc; PWMLER = 0x05; break; case ANTICLOCKWISE: IOSET0 = 0x00000040; PWMMR2 = period - (period/100)*dc; PWMLER = 0x05; break; } } void delay(unsigned int time) { unsigned int i,j; for(i=0;i<time;i++) for(j=0;j<5000;j++); } int main() { unsigned int i; PWM_init(); while(1) { for(i=0;i<=100;i++) { PWM_SetDutyCycle(CLOCKWISE,i); delay(100); } for(i=100;i>0;i--) { PWM_SetDutyCycle(CLOCKWISE,i); delay(100); } for(i=0;i<=100;i++) { PWM_SetDutyCycle(ANTICLOCKWISE,i); delay(100); } for(i=100;i>0;i--) { PWM_SetDutyCycle(ANTICLOCKWISE,i); delay(100); } } }