Function rt_hw_context_switch_to

libcpu/rx/cpuport.c:184–201

* switch to the first thread,it just call one time * * @author LXZ (2014/11/8) * * @param rt_uint32_t to */

 * @param rt_uint32_t to
 */
void rt_hw_context_switch_to(rt_uint32_t to)
{

    rt_interrupt_from_thread = 0;
    rt_interrupt_to_thread = to;
    rt_thread_switch_interrupt_flag = 1;
    /* enable interrupt*/
    _IEN( _ICU_SWINT ) = 1;

    /*clear the interrupt flag*/
    _IR( _ICU_SWINT ) = 0;
    _IPR( _ICU_SWINT ) = MAX_SYSCALL_INTERRUPT_PRIORITY + 1;

    /*touch the software interrupt*/
    ENTER_INTERRUPT();
    /*wait for first thread start up*/
    while(1);
}