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#include <util/delay.h>
#include <avr/io.h>
#include <avr/pgmspace.h>
#include <avr/interrupt.h>
#include <string.h>
#define HZ 3906UL
#define TIMEOUT_SEC 5
#define MIN_PULSE_WIDTH_MS 50
#define RING_DURATION_SEC 20
#define OPEN_DURATION_SEC 3
#define PRESSED_MIN_MS 250
#define RELEASED_MIN_MS 250
uint8_t global_thursday_mode = 0;
void tx_str(const char * PROGMEM s) {
uint8_t c;
while ((c = pgm_read_byte(s++))) {
while (!(UCSR0A & (1<<UDRE0))) ;
UDR0 = c;
}
}
void tx_help(void) {
tx_str(PSTR("Klingeldings v0.23\r\n"));
tx_str(PSTR("Questions? ask <jaseg@jaseg.net>\r\n"));
tx_str(PSTR("Echo is disabled.\r\n\r\n"));
tx_str(PSTR("Notifications are sent on their own line using the format \"CODE Human-readable explanation\\r\\n\".\r\n"));
tx_str(PSTR("The notifications types are (the following occurences have been nerfed using backspaces):\r\n"));
tx_str(PSTR(" T \bHUA Thursday mode auto open\r\n"));
tx_str(PSTR(" R \bING Ringing\r\n"));
tx_str(PSTR(" C \bODE Code access granted\r\n"));
tx_str(PSTR(" T \bHU1 Thursday mode set to on\r\n"));
tx_str(PSTR(" T \bHU0 Thursday mode set to off\r\n"));
tx_str(PSTR(" B \bOOT Device booted.\r\n\r\n"));
tx_str(PSTR(" O \bPEN Manual open\r\n"));
tx_str(PSTR("Commands must be sent on their own line. Available commands:\r\n"));
tx_str(PSTR(" open - Opens the door\r\n"));
tx_str(PSTR(" thursday on - Mutes the ringer and turns on auto opening \r\n"));
tx_str(PSTR(" thursday off - Unmutes the ringer and turns off auto opening\r\n\r\n"));
}
void open(void) {
PORTC |= 0x02; /* Opener relay */
/* wait and blink for a few seconds */
for (uint8_t i=0; i<4*OPEN_DURATION_SEC; i++) {
PORTB ^= 0x20; /* LED */
_delay_ms(250);
}
PORTC &= ~0x02; /* Opener relay */
}
uint8_t handle_open_button(void) {
if (PINC&0x20)
return 0;
tx_str(PSTR("OPEN Manual open\r\n"));
open();
return 1;
}
void ring(void) {
if (global_thursday_mode) {
tx_str(PSTR("THUA Thursday mode auto open\r\n"));
open();
} else {
tx_str(PSTR("RING Ringing\r\n"));
PORTB |= 0x20;
PORTC |= 0x04;
for (uint16_t i=0; i<RING_DURATION_SEC*100 && !handle_open_button(); i++)
_delay_ms(10);
PORTB &= ~0x20;
PORTC &= ~0x04;
}
}
void code(void) {
tx_str(PSTR("CODE Code access granted\r\n"));
open();
}
void set_thursday_mode(uint8_t mode) {
global_thursday_mode = mode;
tx_str(mode ? PSTR("THU1 Thursday mode set to on\r\n") : PSTR("THU0 Thursday mode set to off\r\n"));
if (mode)
PORTC |= 0x10;
else
PORTC &= ~0x10;
}
ISR (USART_RX_vect) {
static uint8_t idx = 0;
static char rxbuf[16];
char ch = UDR0;
if (idx < sizeof(rxbuf)/sizeof(rxbuf[0]))
rxbuf[idx++] = ch;
else
idx = 255;
if (ch == '\r' || ch == '\n') {
idx = 0;
if (!strcmp("open\r", rxbuf))
open();
else if (!strcmp("help\r", rxbuf))
tx_help();
else if (!strcmp("thursday on\r", rxbuf))
set_thursday_mode(1);
else if (!strcmp("thursday off\r", rxbuf))
set_thursday_mode(0);
}
}
int main(void) {
/* IO map:
* A0/PC0 IN ringer relay
* A1/PC1 OUT opener relay
* A2/PC2 OUT ringer signal
* A3/PC3 IN thursday mode toggle
* A4/PC4 OUT thursday mode signal
*/
/* use 115200Bd */
UBRR0H = 0;
UBRR0L = 16;
UCSR0A = (1<<U2X0);
UCSR0B = (1<<RXEN0) | (1<<TXEN0) | (1<<RXCIE0);
UCSR0C = (1<<UCSZ01) | (1<<UCSZ00);
DDRD |= 0x02; /* TX */
TCCR1B = 0x05; /* prescaler=1024 -> 3906.25Hz */
PORTC |= 0x01; /* Ringer relay input */
DDRC |= 0x02; /* Opener relay output */
DDRC |= 0x04; /* Doorbell button output */
PORTC |= 0x08; /* Thursday mode toggle */
DDRC |= 0x10; /* Thursday mode signal */
PORTC |= 0x20; /* Opener button */
DDRB |= 0x20; /* Status LED */
sei();
_delay_ms(500);
tx_help();
tx_str(PSTR("BOOT Device booted.\r\n"));
uint16_t pattern[7];
uint8_t pidx = 0;
uint8_t thursday_toggle_timeout = 0;
uint8_t codefail = 0;
for (;;) {
handle_open_button();
if (!(PINC&0x08) && !thursday_toggle_timeout) { /* Thursday button */
set_thursday_mode(!global_thursday_mode);
thursday_toggle_timeout = 1;
TCNT1 = 0;
}
if (TCNT1 > TIMEOUT_SEC*HZ) { /* Doorbell button timeout */
if (pidx != 0 || codefail)
ring();
pidx = 0;
codefail = 0;
thursday_toggle_timeout = 0;
TCNT1 = 0;
} else {
uint8_t st = PINC&1;
if (st == (pidx&1)) {
uint16_t val = TCNT1;
if (val > HZ/1000*MIN_PULSE_WIDTH_MS) {
pattern[pidx++] = val;
TCNT1 = 0;
if (pidx == sizeof(pattern)/sizeof(pattern[0])-1) {
pidx = 0;
if(( PRESSED_MIN_MS*HZ/1000 <= pattern[1])
&& (RELEASED_MIN_MS*HZ/1000 <= pattern[2])
&& ( PRESSED_MIN_MS*HZ/1000 <= pattern[3])
&& (RELEASED_MIN_MS*HZ/1000 <= pattern[4])
&& ( PRESSED_MIN_MS*HZ/1000 <= pattern[5])
&& (RELEASED_MIN_MS*HZ/1000 <= pattern[6]))
codefail = (code(), 0);
else
codefail = 1;
}
}
}
}
}
}
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