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#include <avr/io.h>
#include "tshield/tshield.h"
static void tshield_init_servo();
void tshield_init() {
DDRH |= (1 << 3) | (1 << 4); //leds
PORTH &= ~( (1 << 3) | (1 << 4));
DDRE |= (1 << 3);
PORTE &= ~(1 << 3);
DDRG |= (1 << 5);
PORTG &= ~(1 << 5);
DDRE &= ~(1 << 4); // buttons
PORTE |= (1 << 4);
DDRH &= ~(1 << 5);
PORTH |= (1 << 5);
DDRB &= ~(1 << 4);
PORTB |= (1 << 4);
DDRB |= (1 << 6);
PORTB &= ~(1 << 6);
tshield_init_servo();
}
#define WAIT_VALUE 20000
#define WAIT() \
for (volatile long x = 0; x < WAIT_VALUE; ++x){}
void tshield_test() {
while(1) {
PORTG |= (1 << 5);
WAIT();
PORTG &= ~(1 << 5);
PORTE |= (1 << 3);
WAIT();
PORTE &= ~(1 << 3);
PORTH |= (1 << 3);
WAIT();
PORTH &= ~(1 << 3);
PORTH |= (1 << 4);
WAIT();
PORTH &= ~(1 << 4);
}
}
unsigned char tshield_read() {
return ((PINE & (1 << 4) ? 0 : 1) << 2 ) |
((PINH & (1 << 5) ? 0 : 1) << 1 ) |
(PINB & (1 << 4) ? 0 : 1);
}
void tshield_led(unsigned char led, unsigned char value) {
volatile unsigned char* port;
unsigned char bit;
switch (led) {
case 0:
port = &PORTG;
bit = 5;
break;
case 1:
port = &PORTE;
bit = 3;
break;
case 2:
port = &PORTH;
bit = 3;
break;
case 3:
port = &PORTH;
bit = 4;
break;
default:
return;
}
if (value) {
*port |= (1 << bit);
} else {
*port &= ~(1 << bit);
}
}
void tshield_pp(unsigned char value) {
if (value) {
PORTB |= (1 << 6);
} else {
PORTB &= ~(1 << 6);
}
}
void tshield_init_servo() {
TCCR1A |= (1<<COM1A1); // non inverted pwm on channel A
TCCR1B |= (1<<CS11) | (1<<CS10); // prescaler 64
//fast pwm
TCCR1A |= (1<<WGM11);
TCCR1B|=(1<<WGM13) | (1<<WGM12);
ICR1=4999; //fPWM=50Hz (Period = 20ms Standard).
DDRB |= (1<< 5);
}
void tshield_servo(unsigned char angle) {
unsigned long k = (unsigned long) angle;
unsigned long counter = (450 * k) / 255 + 150;
OCR1A = (unsigned int) counter;
}
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