79 lines
1.7 KiB
C
79 lines
1.7 KiB
C
/* main.c - Synchronisation demo */
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/*
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* Copyright (c) 2012-2014 Wind River Systems, Inc.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <zephyr.h>
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#include <misc/printk.h>
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/*
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* Nanokernel version of hello world demo has a task and a fiber that utilize
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* semaphores and timers to take turns printing a greeting message at
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* a controlled rate.
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*/
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/* specify delay between greetings (in ms); compute equivalent in ticks */
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#define SLEEPTIME 500
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#define SLEEPTICKS (SLEEPTIME * sys_clock_ticks_per_sec / 1000)
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#define STACKSIZE 2000
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char __stack fiberStack[STACKSIZE];
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struct nano_sem nanoSemTask;
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struct nano_sem nanoSemFiber;
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void fiberEntry(void)
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{
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struct nano_timer timer;
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u32_t data[2] = {0, 0};
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nano_sem_init(&nanoSemFiber);
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nano_timer_init(&timer, data);
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while (1) {
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/* wait for task to let us have a turn */
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nano_fiber_sem_take(&nanoSemFiber, TICKS_UNLIMITED);
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/* say "hello" */
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printk("%s: Hello World!\n", __func__);
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/* wait a while, then let task have a turn */
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nano_fiber_timer_start(&timer, SLEEPTICKS);
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nano_fiber_timer_test(&timer, TICKS_UNLIMITED);
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nano_fiber_sem_give(&nanoSemTask);
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}
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}
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void main(void)
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{
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struct nano_timer timer;
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u32_t data[2] = {0, 0};
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task_fiber_start(&fiberStack[0], STACKSIZE,
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(nano_fiber_entry_t) fiberEntry, 0, 0, 7, 0);
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nano_sem_init(&nanoSemTask);
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nano_timer_init(&timer, data);
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while (1) {
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/* say "hello" */
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printk("%s: Hello World!\n", __func__);
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/* wait a while, then let fiber have a turn */
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nano_task_timer_start(&timer, SLEEPTICKS);
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nano_task_timer_test(&timer, TICKS_UNLIMITED);
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nano_task_sem_give(&nanoSemFiber);
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/* now wait for fiber to let us have a turn */
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nano_task_sem_take(&nanoSemTask, TICKS_UNLIMITED);
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}
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}
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