Example

main.c

#include "uos.h"
#include "board.h"
#include "sysdef.h"

#include "task_led.h"
#include "task_tty.h"

int main(void)
{
    board_init();

    uos_kernel_init();
    uos_task_setup(SYSDEF_TASK_ID_LED, task_led, SYSDEF_TASK_PRIORITY_LED);
    uos_task_setup(SYSDEF_TASK_ID_TTY, task_tty, SYSDEF_TASK_PRIORITY_TTY);
    uos_kernel_start();

    return 0;
}

task_led.c

#include "uos.h"
#include "board.h"
#include "sysdef.h"
#include "task_led.h"

void task_led(void)
{
    while (1) {
#if (UOSDEF_USE_EVENT)
        TASKID tid;
        unsigned int value;
        uos_task_event_recv(&tid, &value);
        switch (value) {
            case 0xAA:
                board_led(1);
                break;
            case 0x55:
                board_led(0);
                break;
            default:
                break;
        }
#else
        board_led(1);
        uos_task_sleep(500);
        board_led(0);
        uos_task_sleep(500);
#endif
    }
}

void task_led_api_led_on(void)
{
#if (UOSDEF_USE_EVENT)
    uos_task_event_send(SYSDEF_TASK_ID_LED, 0xAA);
#endif
}

void task_led_api_led_off(void)
{
#if (UOSDEF_USE_EVENT)
    uos_task_event_send(SYSDEF_TASK_ID_LED, 0x55);
#endif
}

task_tty.c

#include "uos.h"
#include "board.h"
#include "task_tty.h"
#include "task_led.h"

static void my_puts(char *p)
{
    while (*p) {
        while (board_uart_putc(*p) != *p) {
        }
        p++;
    }
}

void task_tty(void)
{
    int led = 0;
    uos_time_t ut_kernel, ut_task;

    while (1) {
        led = !led;
        if (led) {
            my_puts("LED[On ] \r\n");
            task_led_api_led_on();
        } else {
            my_puts("LED[Off] \r\n");
            task_led_api_led_off();
        }
        uos_task_sleep(500);

#if (UOSDEF_USE_TIME)
        uos_time_kernel(&ut_kernel);
        uos_time_task(&ut_task);
#endif
    }
}

Footprint

The kernel footprints with the sample application are shown below.

Version 0.2.0

UOSDEF_USE_EVENT=0, UOSDEF_USE_TIME=0

Debug configuration Release configuration 
text    data     bss     dec     hex filename
3508       4     596    4108    100c UOS-LPC800.axf 
text    data     bss     dec     hex filename
2088       4     596    2688     a80 UOS-LPC800.axf

UOSDEF_USE_EVENT=0, UOSDEF_USE_TIME=1

Debug configuration Release configuration 
text    data     bss     dec     hex filename
4020       4     632    4656    1230 UOS-LPC800.axf 
text    data     bss     dec     hex filename
2296       4     632    2932     b74 UOS-LPC800.axf

UOSDEF_USE_EVENT=1, UOSDEF_USE_TIME=0

Debug configuration Release configuration 
text    data     bss     dec     hex filename
4072       4     656    4732    127c UOS-LPC800.axf 
text    data     bss     dec     hex filename
2324       4     656    2984     ba8 UOS-LPC800.axf

UOSDEF_USE_EVENT=1, UOSDEF_USE_TIME=1

Debug configuration Release configuration 
text    data     bss     dec     hex filename
4400       4     656    5060    13c4 UOS-LPC800.axf 
text    data     bss     dec     hex filename
2476       4     656    3136     c40 UOS-LPC800.axf

Version 0.1.0

Debug configuration Release configuration 
text    data     bss     dec     hex filename
3504       4     576    4084     ff4 UOS-LPC800.axf 
text    data     bss     dec     hex filename
2272       4     576    2852     b24 UOS-LPC800.axf