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Merge hq-relaycard-firmware

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This deprecates it as separate repository.
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Nero 2018-01-28 20:43:49 +00:00 committed by Nero
commit 294553ee84
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7
boards/relaycard.mk Normal file
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include boards/nano.mk
CPPFLAGS += -DBAUDRATE=$(AVRDUDE_BAUD)
ifndef PROG
PROG = uart-relaycard
endif

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uart-relaycard.c Normal file
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#include <stdio.h>
#include <avr/io.h>
#include <util/delay.h>
#include <avr/interrupt.h>
#define BAUD_PRESCALE (((F_CPU/(BAUDRATE*8UL)))-1)
/* Button matrix between PB3-PB4, PC0-PC3
* PC0-PC3 are inputs, default pull-up
* PB3-PB4 are pulled to ground (alternating) while the above are read
*/
uint8_t getButtonState() {
uint8_t val = 0;
// Pull upper button line (PB4) down
PORTB |= (1 << PB3);
PORTB &= ~(1 << PB4);
_delay_ms(1);
val = ((~PINC) << 4);
// Pull lower button line (PB3) down
PORTB &= ~(1 << PB3);
PORTB |= (1 << PB4);
_delay_ms(1);
val |= (~PINC) & 0x0F;
return val;
}
uint8_t getrelay(uint8_t n) {
uint8_t v = 0;
switch(n) {
case 0: v = (PIND >> PD2); break;
case 1: v = (PIND >> PD3); break;
case 2: v = (PIND >> PD4); break;
case 3: v = (PIND >> PD5); break;
case 4: v = (PIND >> PD6); break;
case 5: v = (PIND >> PD7); break;
case 6: v = (PINB >> PB0); break;
case 7: v = (PINB >> PB1); break;
}
return(~v & 1);
}
void setrelay(uint8_t n, uint8_t s) {
if (s) {
switch(n) {
case 0: PORTD &= ~(1 << PD2); break;
case 1: PORTD &= ~(1 << PD3); break;
case 2: PORTD &= ~(1 << PD4); break;
case 3: PORTD &= ~(1 << PD5); break;
case 4: PORTD &= ~(1 << PD6); break;
case 5: PORTD &= ~(1 << PD7); break;
case 6: PORTB &= ~(1 << PB0); break;
case 7: PORTB &= ~(1 << PB1); break;
}
} else {
switch(n) {
case 0: PORTD |= (1 << PD2); break;
case 1: PORTD |= (1 << PD3); break;
case 2: PORTD |= (1 << PD4); break;
case 3: PORTD |= (1 << PD5); break;
case 4: PORTD |= (1 << PD6); break;
case 5: PORTD |= (1 << PD7); break;
case 6: PORTB |= (1 << PB0); break;
case 7: PORTB |= (1 << PB1); break;
}
}
}
char umode = 't';
ISR(USART_RX_vect) {
uint8_t c = UDR0;
if (c == 't' || c == 'e' || c == 'd') {
umode = c;
} else if (c >= '0' && c <= '7') {
c = c - '0';
if (umode == 'e') {
setrelay(c,1);
} else if (umode == 'd') {
setrelay(c,0);
} else if (umode == 't') {
setrelay(c,1 - getrelay(c));
}
}
}
int main() {
DDRC &= ~(0b1111); // This sets PC0 to PC3 to input
PORTC |= 0b1111; // This makes said pins pull-up per default
DDRB |= (1 << PB3) | (1 << PB4); // Keypad rows
DDRD |= 0b11111100; // PD2 to PD7 for relay
DDRB |= 0b00000011; // PB0 and PB1 for relay
// Same with PORT, so relays stay off
PORTD |= 0b11111100;
PORTB |= 0b00000011;
// Init uart
UCSR0A = (1<<U2X0);
// Transmit is enabled to set PIN levels, but we will never write
UCSR0B = (1<<RXEN0) | (1<<TXEN0) | (1<<RXCIE0);
UCSR0C = (1<<UCSZ00) | (1<<UCSZ01); // 8N1
UBRR0 = BAUD_PRESCALE;
sei();
// Now handle button inputs
uint8_t c,p,d,i;
p = 0;
while (1) {
c = getButtonState();
d = c ^ p;
p = c;
for (i = 0; i<8; i++) {
if (d & c & 0x80) {
setrelay(i, 1 - getrelay(i));
}
d = d << 1;
c = c << 1;
}
};
}