[ECOS] Using alarm

[Ho Shui Choy Stanley NCS <scho at ncs dot com dot sg>]

Hi

I have written a test program using alarm. Following is the code:

static void my_alarm_func (cyg_handle_t alarm, cyg_addrword_t data)
{
    cyg_uint8 buf[100];
    cyg_uint32 len;
    cyg_uint16 index;
    bool found;

        len = 100;
        cyg_io_read(serial0, buf, &len);  //clear buffer
        len =  strlen(at_cmd);
        cyg_io_write(serial0, at_cmd, &len);

        if (green_led_status == false) {
            PIO->PIO_CODR = GREEN_LED;
            green_led_status = true;
        }
        else {
            PIO->PIO_SODR = GREEN_LED;
            green_led_status = false;
        }
    
        found =false;

        //// program hangs here
        while (found == false) {
            len = 100;
            cyg_io_read(serial0, buf, &len);
            if (len != 0) {
                for (index = 0; index < len; index++) {
                    if (buf[index] == 0x3E) {
                        found = true;
                        break;
                    }
                }
            }
        }

        if (found == true) {
            len = strlen(string);
            cyg_io_write(serial0, string, &len);
        }
}

static void blink_led(CYG_ADDRESS data)
{
    bool found = false;

    while (1) {
        if (found == false) {
            PIO->PIO_CODR = YELLOW_LED;
            found = true;
        }
        else {
            PIO->PIO_SODR = YELLOW_LED;
            found = false;
        }
        cyg_thread_delay(100);

    }
}

void cyg_user_start(void)
{
    cyg_uint32 data = 0;
    cyg_uint32 data_len = sizeof(data);

    cyg_tick_count_t new_alarm_trig = 200;
    cyg_tick_count_t new_alarm_intv = 3000;

    cyg_io_lookup( "/dev/ser0", &serial0 );

#ifdef CYGOPT_IO_SERIAL_SUPPORT_NONBLOCKING
	// serial port 0
	cyg_io_set_config(serial0, CYG_IO_SET_CONFIG_READ_BLOCKING, &data ,
&data_len);
#endif

    cyg_clock_to_counter(cyg_real_time_clock(), &rtc_handle);

    cyg_alarm_create(rtc_handle, &my_alarm_func, 1, &my_alarm_handle,
&my_alarm);
    cyg_alarm_initialize(my_alarm_handle, new_alarm_trig, new_alarm_intv);
    cyg_alarm_enable(my_alarm_handle);

    cyg_thread_create(4, blink_led, (cyg_addrword_t) 0, "serial1",
                      (void *)stack[0], STACKSIZE, &thread[0],
&thread_obj[0]);
    cyg_thread_resume(thread[0]);
}

The program hangs when the alarm triggers for the first time and stops in
the alarm function at the while loop.
Can anyone please advice on what is the cause?

Thanks
Stanley
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