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/* Lock back, connected to the servo */
#include <stdint.h>
#include <string.h>
#include <avr/wdt.h>
#include <avr/sleep.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include "nrfm.h"
#include "uart.h"
#include "util.h"
#define PWM_MIN 500
#define PWM_MID 1500
#define PWM_MAX 2500
#define PWM_TOP 20000
#define SERVO_PIN PB1
#define LOCK_PIN PD3
#define UNLOCK_PIN PD4
#define RX_IRQ_PIN PC1
#define RX_DDR DDRC
#define RX_PIN PINC
#define RX_ICR PCICR
#define RX_IE PCIE1
#define RX_INT PCINT9
#define RX_MSK PCMSK1
#define RX_INTVEC PCINT1_vect
#define VCC_MIN 4700
static char tab[] = {
'0', '8', '3', '6', 'a', 'Z', '$', '4', 'v', 'R', '@',
'E', '1', 'o', '#', ')', '2', '5', 'q', ';', '.', 'I',
'c', '7', '9', '*', 'L', 'V', '&', 'k', 'K', '!', 'm',
'N', '(', 'O', 'Q', 'A', '>', 'T', 't', '?', 'S', 'h',
'w', '/', 'n', 'W', 'l', 'M', 'e', 'H', 'j', 'g', '[',
'P', 'f', ':', 'B', ']', 'Y', '^', 'F', '%', 'C', 'x'
};
static volatile uint8_t rxd = 0;
static uint16_t tablen = sizeof(tab) / sizeof(tab[0]);
static inline void keygen(char *buf, uint8_t n)
{
int i, imax;
uint8_t sreg;
uint16_t seed;
sreg = SREG;
cli();
seed = TCNT1;
SREG = sreg;
for (i = 0, imax = n - 1; i < imax; i++, seed++)
buf[i] = tab[(seed % tablen)];
buf[imax] = '\0';
}
static inline void keydel(char *buf, uint8_t n)
{
int i;
for (i = 0; i < n; i++)
buf[i] = 0;
}
static inline void init_wdt(void)
{
cli();
wdt_reset();
WDTCSR |= (1 << WDCE) | ( 1 << WDE);
WDTCSR = (1 << WDP2) | (1 << WDP1);
WDTCSR |= (1 << WDIE);
}
static inline void init_rx(void)
{
RX_DDR &= ~(1 << RX_IRQ_PIN);
RX_ICR |= (1 << RX_IE);
RX_MSK |= (1 << RX_INT);
}
static inline void init_btns(void)
{
DDRD &= ~((1 << LOCK_PIN) | (1 << UNLOCK_PIN));
PORTD |= ((1 << LOCK_PIN) | (1 << UNLOCK_PIN));
EICRA = 0b00000000;
EIMSK = (1 << INT1);
PCICR |= (1 << PCIE2);
PCMSK2 |= (1 << PCINT20);
}
static inline void init_servo(void)
{
ICR1 = PWM_TOP;
TCCR1A |= (1 << WGM11) | (1 << COM1A1);
TCCR1B |= (1 << WGM13) | (1 << CS11);
DDRB |= (1 << SERVO_PIN);
}
static inline void lock(void)
{
OCR1A = PWM_MID;
_delay_ms(100);
OCR1A = PWM_TOP;
}
static inline void unlock(void)
{
OCR1A = PWM_MAX - 50;
_delay_ms(100);
OCR1A = PWM_TOP;
}
int main(void)
{
uint8_t rxaddr[ADDRLEN] = { 194, 178, 83 };
uint8_t txaddr[ADDRLEN] = { 194, 178, 82 };
char buf[WDLEN], key[WDLEN], msg[WDLEN];
init_wdt();
init_rx();
init_btns();
init_servo();
uart_init();
led_init();
radio_init(rxaddr);
radio_print_config();
sei();
radio_listen();
for (;;) {
if (!rxd)
_delay_ms(250);
if (rxd) {
radio_recv(buf, WDLEN);
rxd = 0;
xor(KEY, buf, msg, WDLEN);
if (memcmp(msg, SYN, WDLEN) == 0) {
keygen(key, WDLEN);
xor(KEY, key, buf, WDLEN);
radio_sendto(txaddr, buf, WDLEN);
} else {
xor(key, buf, msg, WDLEN);
if (memcmp(msg, LOCK, WDLEN) == 0) {
lock();
keydel(key, WDLEN);
} else if (memcmp(msg, UNLOCK, WDLEN) == 0) {
unlock();
keydel(key, WDLEN);
}
}
} else {
radio_pwr_dwn();
if (getvcc() < VCC_MIN)
led_bat();
sleep_bod_disable();
set_sleep_mode(SLEEP_MODE_PWR_DOWN);
sleep_mode();
radio_listen();
}
}
return 0;
}
ISR(RX_INTVEC)
{
if (!(RX_PIN & (1 << RX_IRQ_PIN)))
rxd = 1;
}
ISR(INT1_vect)
{
if (is_btn_pressed(PIND, LOCK_PIN)) {
lock();
led_locked();
}
}
ISR(PCINT2_vect)
{
if (is_btn_pressed(PIND, UNLOCK_PIN)) {
unlock();
led_unlocked();
}
}
EMPTY_INTERRUPT(WDT_vect);
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