115 lines
2.9 KiB
C
115 lines
2.9 KiB
C
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#include <stdio.h>
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#include <avr/io.h>
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#include <util/delay.h>
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#include <avr/interrupt.h>
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#include "uart.h"
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/* Button matrix between PB3-PB4, PC0-PC3
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* PC0-PC3 are inputs, default pull-up
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* PB3-PB4 are pulled to ground (alternating) while the above are read
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*/
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void print_nibble(uint8_t nibble) {
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nibble += 0x30;
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if (nibble > 0x39) nibble += 7;
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uart_putc(nibble);
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}
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void print_int8hex(uint8_t val) {
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print_nibble(val >> 4);
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print_nibble(val & 0x0F);
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}
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uint8_t getButtonState() {
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uint8_t val = 0;
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// Pull upper button line (PB4) down
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PORTB |= (1 << PB3);
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PORTB &= ~(1 << PB4);
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_delay_ms(1);
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val = ((~PINC) << 4);
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// Pull lower button line (PB3) down
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PORTB &= ~(1 << PB3);
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PORTB |= (1 << PB4);
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_delay_ms(1);
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val |= (~PINC) & 0x0F;
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return val;
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}
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uint8_t getrelay(uint8_t n) {
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uint8_t v = 0;
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switch(n) {
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case 0: v = (PIND >> PD2); break;
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case 1: v = (PIND >> PD3); break;
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case 2: v = (PIND >> PD4); break;
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case 3: v = (PIND >> PD5); break;
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case 4: v = (PIND >> PD6); break;
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case 5: v = (PIND >> PD7); break;
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case 6: v = (PINB >> PB0); break;
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case 7: v = (PINB >> PB1); break;
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}
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return(~v & 1);
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}
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void setrelay(uint8_t n, uint8_t s) {
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if (s) {
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switch(n) {
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case 0: PORTD &= ~(1 << PD2); break;
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case 1: PORTD &= ~(1 << PD3); break;
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case 2: PORTD &= ~(1 << PD4); break;
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case 3: PORTD &= ~(1 << PD5); break;
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case 4: PORTD &= ~(1 << PD6); break;
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case 5: PORTD &= ~(1 << PD7); break;
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case 6: PORTB &= ~(1 << PB0); break;
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case 7: PORTB &= ~(1 << PB1); break;
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}
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} else {
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switch(n) {
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case 0: PORTD |= (1 << PD2); break;
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case 1: PORTD |= (1 << PD3); break;
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case 2: PORTD |= (1 << PD4); break;
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case 3: PORTD |= (1 << PD5); break;
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case 4: PORTD |= (1 << PD6); break;
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case 5: PORTD |= (1 << PD7); break;
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case 6: PORTB |= (1 << PB0); break;
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case 7: PORTB |= (1 << PB1); break;
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}
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}
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}
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int main() {
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DDRC &= ~(0b1111); // This sets PC0 to PC3 to input
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PORTC |= 0b1111; // This makes dito pull-up per default
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DDRB |= (1 << PB3) | (1 << PB4); // Keybad rows
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DDRD |= 0b11111100; // PD2 to PD7 for relay
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DDRB |= 0b00000011; // PB0 and PB1 for relay
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// Same with PORT, so relays stay off
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PORTD |= 0b11111100;
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PORTB |= 0b00000011;
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sei();
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uint8_t c,p,d,i;
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p = 0;
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while (1) {
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c = getButtonState();
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d = c ^ p;
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p = c;
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for (i = 0; i<8; i++) {
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if (d & c & 0x80) {
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setrelay(i, 1 - getrelay(i));
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print_nibble(i);
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uart_putc('\r');
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uart_putc('\n');
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}
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d = d << 1;
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c = c << 1;
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}
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};
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}
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