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/* Lock back, connected to the servo */
#include <stdint.h>
#include <string.h>
#include <avr/interrupt.h>
#include <avr/wdt.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 BTN_PIN PINC
#define BTN_PCIE PCIE1
#define BTN_PCINTVEC PCINT1_vect
#define LOCK_BTN PD6
#define UNLOCK_BTN PD7
#define LOCK_BTN_PCINT PCINT12
#define UNLOCK_BTN_PCINT PCINT13
#define RX_PIN PD7
#define RX_DDR DDRD
#define RX_PORT PORTD
#define RX_PCIE PCIE2
#define RX_PCINT PCINT23
#define RX_PCMSK PCMSK2
#define RX_PCINTVEC PCINT2_vect
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 uint8_t syn = 0;
static volatile uint8_t rxdr = 0;
static volatile uint8_t btn_press = 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 btn_init(void)
{
DDRD &= ~((1 << LOCK_BTN) | (1 << UNLOCK_BTN));
PORTD |= (1 << LOCK_BTN) | (1 << UNLOCK_BTN);
PCICR |= (1 << BTN_PCIE);
PCMSK2 |= ((1 << LOCK_BTN_PCINT) | (1 << UNLOCK_BTN_PCINT));
}
static inline void servo_init(void)
{
DDRB |= (1 << SERVO_PIN);
TCCR1A |= (1 << WGM11) | (1 << COM1A1);
TCCR1B |= (1 << WGM13) | (1 << CS11);
ICR1 = PWM_TOP;
}
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 n;
uint8_t rxaddr[ADDRLEN] = { 194, 178, 83 };
uint8_t txaddr[ADDRLEN] = { 194, 178, 82 };
char buf[WDLEN + 1], key[WDLEN + 1], msg[WDLEN + 1];
RX_DDR &= ~(1 << RX_PIN);
RX_PORT |= (1 << RX_PIN);
PCICR |= (1 << RX_PCIE);
RX_PCMSK |= (1 << RX_PCINT);
uart_init();
btn_init();
servo_init();
radio_init(rxaddr);
radio_print_config();
sei();
radio_listen();
for (;;) {
if (!rxdr)
_delay_ms(500);
if (rxdr) {
n = radio_recv(buf, WDLEN);
buf[n] = '\0';
if (!syn) {
xor(KEY, buf, msg, WDLEN);
if (strncmp(msg, SYN, WDLEN) == 0) {
syn = 1;
keygen(key, WDLEN + 1);
xor(KEY, key, buf, WDLEN);
radio_sendto(txaddr, buf, WDLEN);
}
} else {
syn = 0;
xor(key, buf, msg, WDLEN);
if (strncmp(msg, LOCK, WDLEN) == 0)
lock();
else if (strncmp(msg, UNLOCK, WDLEN) == 0)
unlock();
keydel(buf, WDLEN);
}
rxdr = 0;
}
if (btn_press) {
if (is_btn_pressed(BTN_PIN, LOCK_BTN))
lock();
else if (is_btn_pressed(BTN_PIN, UNLOCK_BTN))
unlock();
btn_press = 0;
}
// todo: sleep
}
return 0;
}
ISR(RX_PCINTVEC)
{
rxdr = 1;
}
ISR(BTN_PCINTVEC)
{
btn_press = 1;
}
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