141 lines
3.0 KiB
C
141 lines
3.0 KiB
C
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#include <stdlib.h>
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <avr/pgmspace.h>
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#include "lcd_routines.h"
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#include "uart.h"
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#define SAVE PD2
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#define SIGNAL PD3
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#define FREQ_DOWN PD4
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#define FREQ_UP PD5
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#define AMP_DOWN PD6
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#define AMP_UP PD7
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#define KEY_DDR DDRD
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#define KEY_PORT PORTD
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#define KEY_PIN PIND
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#define KEY_ON_DDR DDRB
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#define KEY_ON_PORT PORTB
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#define KEY_ON_PIN PINB
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#define KEY_ON PB0
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#define LED_PIN PA7
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#define LED_PORT PORTA
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#define LED_DDR DDRA
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#define led_on() LED_PORT |= _BV(LED_PIN);
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#define led_off() LED_PORT &= ~_BV(LED_PIN);
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#define led_toggle() LED_PORT ^= _BV(LED_PIN)
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#define UART_BAUD_RATE 9600
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#define ALL_KEYS (_BV(SAVE) | _BV(SIGNAL) | _BV(FREQ_DOWN) | _BV(FREQ_UP) | _BV(AMP_DOWN) | _BV(AMP_UP) )
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#define REPEAT_MASK ALL_KEYS
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#define REPEAT_START 50
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#define REPEAT_NEXT 20
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volatile uint16_t key_state;
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volatile uint16_t key_press;
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/* prototypes */
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void init_io();
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uint16_t get_key_press(uint16_t key_mask);
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int main(void) {
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init_io();
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lcd_init();
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uart_init(UART_BAUD_SELECT(UART_BAUD_RATE,F_CPU));
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lcd_setcursor(0, 0);
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unsigned int c;
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sei();
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for (;;) {
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if (uart_available() > 0) {
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c = uart_getc();
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if (c == '}') {
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lcd_clear();
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} else if (c == '*') {
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lcd_setcursor(0, 2);
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} else if (c == '+') {
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lcd_setcursor(0, 1);
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} else if (c == '\'') {
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led_off();
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} else if (c == '#') {
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led_on();
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} else {
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lcd_data(c);
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}
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}
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if (get_key_press(_BV(FREQ_DOWN))) {
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uart_putc('f');
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}
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if (get_key_press(_BV(FREQ_UP))) {
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uart_putc('F');
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}
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if (get_key_press(_BV(SIGNAL))) {
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uart_putc('s');
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}
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if (get_key_press(_BV(AMP_UP))) {
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uart_putc('A');
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}
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if (get_key_press(_BV(AMP_DOWN))) {
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uart_putc('a');
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}
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if (get_key_press(_BV(KEY_ON) << 8)) {
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uart_putc('o');
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}
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if (get_key_press(_BV(SAVE))) {
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uart_putc('v');
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}
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}
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}
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void init_io() {
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KEY_DDR &= ~ALL_KEYS; // configure key port for input
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KEY_PORT |= ALL_KEYS;
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KEY_ON_DDR &= ~_BV(KEY_ON);
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KEY_ON_PORT |= _BV(KEY_ON);
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LED_DDR |= _BV(LED_PIN);
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LED_PORT &= ~_BV(LED_PIN);
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TCCR0 = (1 << CS02) | (1 << CS00); // divide by 1024
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TCNT0 = (uint8_t) (int16_t) -(F_CPU / 1024 * 10e-3 + 0.5); // preload for 10ms
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TIMSK |= 1 << TOIE0; // enable timer interrupt
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}
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ISR( TIMER0_OVF_vect ) {
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static uint16_t ct0, ct1;
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uint16_t i;
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TCNT0 = (uint8_t) (int16_t) -(F_CPU / 1024 * 10e-3 + 0.5); // preload for 10ms
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i = key_state ^ ~(KEY_PIN | (KEY_ON_PIN << 8)); // key changed ?
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ct0 = ~(ct0 & i); // reset or count ct0
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ct1 = ct0 ^ (ct1 & i); // reset or count ct1
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i &= ct0 & ct1; // count until roll over ?
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key_state ^= i; // then toggle debounced state
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key_press |= key_state & i; // 0->1: key press detect
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}
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uint16_t get_key_press(uint16_t key_mask) {
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cli();
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// read and clear atomic !
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key_mask &= key_press; // read key(s)
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key_press ^= key_mask; // clear key(s)
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sei();
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return key_mask;
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}
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