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170 lines
2.6 KiB
C
170 lines
2.6 KiB
C
/*
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* fw/board_app.c - Board-specific functions (for the application)
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*
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* Written 2011 by Werner Almesberger
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* Copyright 2011 Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <stddef.h>
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#include <stdint.h>
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#include <avr/io.h>
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#include <avr/interrupt.h>
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#define F_CPU 8000000UL
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#include <util/delay.h>
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#include "usb.h"
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#include "at86rf230.h"
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#include "board.h"
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#include "spi.h"
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static volatile uint32_t timer_h = 0; /* 2^(16+32) / 8 MHz = ~1.1 years */
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void reset_cpu(void)
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{
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WDTCSR = 1 << WDE;
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}
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uint8_t read_irq(void)
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{
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return PIN(IRQ_RF);
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}
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void slp_tr(void)
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{
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SET(SLP_TR);
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CLR(SLP_TR);
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}
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ISR(TIMER1_OVF_vect)
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{
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timer_h++;
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}
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uint64_t timer_read(void)
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{
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uint32_t high;
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uint8_t low, mid;
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do {
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if (TIFR1 & (1 << TOV1)) {
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TIFR1 = 1 << TOV1;
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timer_h++;
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}
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high = timer_h;
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low = TCNT1L;
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mid = TCNT1H;
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}
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while (TIFR1 & (1 << TOV1));
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/*
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* We need all these casts because the intermediate results are handled
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* as if they were signed and thus get sign-expanded. Sounds wrong-ish.
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*/
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return (uint64_t) high << 16 | (uint64_t) mid << 8 | (uint64_t) low;
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}
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void timer_init(void)
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{
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/* configure timer 1 as a free-running CLK counter */
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TCCR1A = 0;
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TCCR1B = 1 << CS10;
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/* enable timer overflow interrupt */
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TIMSK1 = 1 << TOIE1;
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}
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int gpio(uint8_t port, uint8_t data, uint8_t dir, uint8_t mask, uint8_t *res)
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{
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EIMSK = 0; /* recover INT_RF to ATUSB_GPIO_CLEANUP or an MCU reset */
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switch (port) {
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case 1:
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DDRB = (DDRB & ~mask) | dir;
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PORTB = (PORTB & ~mask) | data;
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break;
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case 2:
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DDRC = (DDRC & ~mask) | dir;
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PORTC = (PORTC & ~mask) | data;
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break;
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case 3:
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DDRD = (DDRD & ~mask) | dir;
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PORTD = (PORTD & ~mask) | data;
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break;
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default:
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return 0;
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}
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/* disable the UART so that we can meddle with these pins as well. */
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spi_off();
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_delay_ms(1);
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switch (port) {
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case 1:
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res[0] = PINB;
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res[1] = PORTB;
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res[2] = DDRB;
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break;
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case 2:
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res[0] = PINC;
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res[1] = PORTC;
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res[2] = DDRC;
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break;
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case 3:
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res[0] = PIND;
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res[1] = PORTD;
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res[2] = DDRD;
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break;
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}
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return 1;
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}
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void gpio_cleanup(void)
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{
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EIMSK = 1 << 0;
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}
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static void done(void *user)
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{
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led(0);
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}
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ISR(INT0_vect)
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{
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static uint8_t buf;
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if (eps[1].state == EP_IDLE) {
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led(1);
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usb_send(&eps[1], &buf, 1, done, NULL);
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}
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}
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void board_app_init(void)
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{
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/* enable INT0, trigger on rising edge */
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EICRA = 1 << ISC01 | 1 << ISC00;
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EIMSK = 1 << 0;
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}
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