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42483d67b4
At an interrupt barrier, the host must be able to ensure that no interrupt generated before reaching the barrier is still pending and will be delivered after crossing the barrier. For this, we introduce the following concept: - interrupts have a serial number. This number is sent to the host on EP 1 (currently bulk) to signal the interrupt, instead of the zero byte we used previously. - the new request ATUSB_SPI_WRITE2_SYNC returns the interrupt serial number from after the register write (the register write itself is the interrupt barrier). - the host can now check if the serial indicated from bulk and the serial from ATUSB_SPI_WRITE2_SYNC are the same. If yes, interrupts are synchronized. If not, it has to wait for the interrupt to be signaled on EP 1. We should also consider the case that the interrupt serial has gotten ahead of ATUSB_SPI_WRITE2_SYNC. But that seems to happen rarely. In any case, it's something for the host driver to worry about, not for the firmware. - board.h (irq_serial), board_app.c (irq_serial, INT0_vect): count the interrupt serial number and return it when signaling the interrupt - include/atusb/ep0.h (ATUSB_SPI_WRITE2_SYNC), ep0.c (my_setup): new request ATUSB_SPI_WRITE2_SYNC that does a register write, then returns the interrupt serial
172 lines
2.6 KiB
C
172 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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uint8_t irq_serial;
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ISR(INT0_vect)
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{
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if (eps[1].state == EP_IDLE) {
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led(1);
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irq_serial++;
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usb_send(&eps[1], &irq_serial, 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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