78982ebb51
Don't rely on the generic scheduler code to always have a timer no more than 1ms in the future. Instead, create an avr specific timer that will be called every 0x8000 ticks. This simplifies the generic code and it reduces the amount of code that needs to be run every millisecond. Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
123 lines
2.0 KiB
C
123 lines
2.0 KiB
C
// Main starting point for host simulator.
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//
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// Copyright (C) 2016 Kevin O'Connor <kevin@koconnor.net>
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//
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// This file may be distributed under the terms of the GNU GPLv3 license.
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#include <fcntl.h>
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#include <stdio.h>
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#include <unistd.h>
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#include "board/misc.h" // timer_from_us
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#include "board/irq.h" // irq_disable
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#include "sched.h" // sched_main
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/****************************************************************
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* Interrupts
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****************************************************************/
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irqstatus_t Interrupt_off;
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void
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irq_disable(void)
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{
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Interrupt_off = 1;
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barrier();
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}
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void
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irq_enable(void)
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{
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barrier();
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Interrupt_off = 0;
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}
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irqstatus_t
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irq_save(void)
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{
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irqstatus_t flag = Interrupt_off;
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irq_disable();
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return flag;
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}
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void
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irq_restore(irqstatus_t flag)
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{
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barrier();
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Interrupt_off = flag;
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}
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void
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irq_wait(void)
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{
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}
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void
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irq_poll(void)
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{
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}
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/****************************************************************
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* Timers
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****************************************************************/
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uint32_t
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timer_from_us(uint32_t us)
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{
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return 0; // XXX
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}
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uint8_t
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timer_is_before(uint32_t time1, uint32_t time2)
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{
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return (int32_t)(time1 - time2) < 0;
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}
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uint32_t
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timer_read_time(void)
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{
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return 0; // XXX
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}
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void
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timer_kick(void)
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{
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}
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/****************************************************************
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* Turn stdin/stdout into serial console
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****************************************************************/
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// Encode and transmit a "response" message
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void
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console_sendf(const struct command_encoder *ce, va_list args)
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{
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}
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/****************************************************************
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* Startup
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****************************************************************/
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// Periodically sleep so we don't consume all CPU
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void
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simu_pause(void)
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{
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// XXX - should check that no timers are present.
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usleep(1);
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}
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DECL_TASK(simu_pause);
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// Main entry point for simulator.
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int
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main(void)
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{
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// Make stdin non-blocking
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fcntl(STDIN_FILENO, F_SETFL, fcntl(STDIN_FILENO, F_GETFL, 0) | O_NONBLOCK);
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sched_main();
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return 0;
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}
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