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#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 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
#define LOCK_PIN PD2
#define UNLOCK_PIN PD3
static volatile int rxdr = 0;
static volatile int lock = 0;
static inline void init_rx(void)
{
RX_DDR &= ~(1 << RX_PIN);
RX_PORT |= (1 << RX_PIN);
PCICR |= (1 << RX_PCIE);
RX_PCMSK |= (1 << RX_PCINT);
}
static inline void init_btns(void)
{
DDRD &= ~((1 << LOCK_PIN) | (1 << UNLOCK_PIN));
PORTD |= ((1 << LOCK_PIN) | (1 << UNLOCK_PIN));
EICRA = 0b00000000;
EIMSK = (1 << INT0) | (1 << INT1);
}
static inline int is_btn_pressed(unsigned char btn)
{
if (!((PIND >> btn) & 0x01)) {
_delay_us(2000);
return !((PIND >> btn) & 0x01);
}
return 0;
}
int main(void)
{
uint8_t n;
char buf[MAXPDLEN + 1];
uint8_t rxaddr[ADDRLEN] = { 194, 178, 82 };
uint8_t txaddr[ADDRLEN] = { 194, 178, 83 };
init_rx();
init_btns();
uart_init();
radio_init(rxaddr);
radio_print_config();
sei();
radio_listen();
for (;;) {
if (rxdr) {
n = radio_recv(buf, MAXPDLEN);
buf[n] = '\0';
rxdr = 0;
if (strncmp(buf, "ACK", 3) == 0) {
uart_write("INFO: ");
uart_write_line(buf);
}
}
if (lock) {
lock = 0;
radio_sendto(txaddr, "SYN", 3);
}
}
return 0;
}
ISR(RX_PCINTVEC)
{
rxdr = 1;
}
ISR(INT0_vect)
{
if (is_btn_pressed(LOCK_PIN))
lock = 1;
}
ISR(INT1_vect)
{
if (is_btn_pressed(UNLOCK_PIN))
lock = 1;
}
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