microchip-application-pec930-pec930_peripheral/Examples/system/sys_tick_swi

sys_tick_swi

This example is used to configure ECLIC module

• Support to register the proprietary ISR for specific requirement.
• Support programmable IRQ-Level

reference sys_irq_level_t

• Support programmable IRQ-Priority

reference sys_irq_priority_t

• Configure SWI (Software Interupt) level

  The default level of system timer is SYS_IRQ_LEVEL_L

  // at main.c
  /**
   *  The defualt level of system timer is SYS_IRQ_LEVEL_L
   *  ps. SYS_IRQ_LEVEL_LL/ SYS_IRQ_LEVEL_L/ SYS_IRQ_LEVEL_M
   */
  #define CONFIG_IRQ_SWI_LEVEL        SYS_IRQ_LEVEL_L
  

  • Use sys_register_IRQ() to re-configure attributes of an interrupt

    sys_irq_attr_t      irq_attr = { .disable_vector = false, };
    
    irq_attr.trig_mode      = SYS_IRQ_TRIGGER_LEVEL;
    irq_attr.level          = SYS_IRQ_LEVEL_L;
    irq_attr.priority       = SYS_IRQ_PRIORITY_MIDDEN;
    sys_register_IRQ(SysTimer_IRQn, _mtim_handler, &irq_attr);
    

• This example use message (in ISR) to figure out the relation of Level/Priority of ECLIC

  Logging message in ISR is misbehavior

  • For logging message, the period of system tick MUST be more then 1-msec

    // at main.c,
    /* The period MUST be more then 1 msec */
    sys_config_systick(SYS_TICK_10_MS);
    

Log

Use serial port with baudrate 115200, 8bit, no parity check.

• If SWI level is equal to system timer

  // at main.c
  #define CONFIG_IRQ_SWI_LEVEL        SYS_IRQ_LEVEL_L
  
  #define CONFIG_IRQ_SWI_PRIORITY     SYS_IRQ_PRIORITY_MIDDEN
  

  • Priority is the same

    Feb 20 2025 12:42:39
    This is a demo projec to configure ECLIC (IRQ Level: SWI == SysTim, Priority: SWI == SysTim)
    -> _mtim_handler 0-th   <--- enter ISR of system timer
    <- _mtim_handler        <--- leave system timer
     => _mswi_handler 1-th  <--- enter ISR of SWI (wait for system timer finish)
     <= _mswi_handler       <--- leave SWI
    -> _mtim_handler 1-th
    <- _mtim_handler
     => _mswi_handler 2-th
     <= _mswi_handler
    -> _mtim_handler 2-th
    <- _mtim_handler
     => _mswi_handler 3-th
     <= _mswi_handler
    -> _mtim_handler 3-th
    <- _mtim_handler
     => _mswi_handler 4-th
     <= _mswi_handler
    -> _mtim_handler 4-th
    <- _mtim_handler
     => _mswi_handler 5-th
     <= _mswi_handler
    done~~~
    

  • If SWI priority is greater then system timer

    Feb 20 2025 12:40:04
    This is a demo projec to configure ECLIC (IRQ Level: SWI == SysTim, Priority: SWI > SysTim)
    -> _mtim_handler 0-th   <--- enter ISR of system timer
    <- _mtim_handler        <--- leave system timer
     => _mswi_handler 1-th  <--- enter ISR of SWI (wait for system timer finish)
     <= _mswi_handler       <--- leave SWI
    -> _mtim_handler 1-th
    <- _mtim_handler
     => _mswi_handler 2-th
     <= _mswi_handler
    -> _mtim_handler 2-th
    <- _mtim_handler
     => _mswi_handler 3-th
     <= _mswi_handler
    -> _mtim_handler 3-th
    <- _mtim_handler
     => _mswi_handler 4-th
     <= _mswi_handler
    -> _mtim_handler 4-th
    <- _mtim_handler
     => _mswi_handler 5-th
     <= _mswi_handler
    done~~~
    

  • If SWI priority is lower then system timer

    Feb 20 2025 12:44:14
    This is a demo projec to configure ECLIC (IRQ Level: SWI == SysTim, Priority: SWI < SysTim)
    -> _mtim_handler 0-th   <--- enter ISR of system timer
    <- _mtim_handler        <--- leave system timer
     => _mswi_handler 1-th  <--- enter ISR of SWI (wait for system timer finish)
     <= _mswi_handler       <--- leave SWI
    -> _mtim_handler 1-th
    <- _mtim_handler
     => _mswi_handler 2-th
     <= _mswi_handler
    -> _mtim_handler 2-th
    <- _mtim_handler
     => _mswi_handler 3-th
     <= _mswi_handler
    -> _mtim_handler 3-th
    <- _mtim_handler
     => _mswi_handler 4-th
     <= _mswi_handler
    -> _mtim_handler 4-th
    <- _mtim_handler
     => _mswi_handler 5-th
     <= _mswi_handler
    done~~~
    

• If SWI level is greater than system timer

  // at main.c
  #define CONFIG_IRQ_SWI_LEVEL        SYS_IRQ_LEVEL_M
  
  #define CONFIG_IRQ_SWI_PRIORITY     SYS_IRQ_PRIORITY_MIDDEN
  

  Feb 20 2025 12:45:53
  This is a demo projec to configure ECLIC (IRQ Level: SWI > SysTim, Priority: SWI == SysTim)
  -> _mtim_handler 0-th   <--- enter ISR of system timer
   => _mswi_handler 1-th  <--- Nested interrupt by SWI
   <= _mswi_handler       <--- leave SWI
  <- _mtim_handler        <--- leave system timer
  -> _mtim_handler 1-th
   => _mswi_handler 2-th
   <= _mswi_handler
  <- _mtim_handler
  -> _mtim_handler 2-th
   => _mswi_handler 3-th
   <= _mswi_handler
  <- _mtim_handler
  -> _mtim_handler 3-th
   => _mswi_handler 4-th
   <= _mswi_handler
  <- _mtim_handler
  -> _mtim_handler 4-th
   => _mswi_handler 5-th
   <= _mswi_handler
  <- _mtim_handler
  done~~~
  

• If SWI level is lower then system timer

  // at main.c
  #define CONFIG_IRQ_SWI_LEVEL        SYS_IRQ_LEVEL_LL
  
  #define CONFIG_IRQ_SWI_PRIORITY     SYS_IRQ_PRIORITY_MIDDEN
  

  Feb 20 2025 12:47:11
  This is a demo projec to configure ECLIC (IRQ Level: SWI < SysTim, Priority: SWI == SysTim)
  -> _mtim_handler 0-th   <--- enter ISR of system timer
  <- _mtim_handler        <--- leave system timer
   => _mswi_handler 1-th  <--- enter ISR of SWI (wait for system timer finish)
   <= _mswi_handler       <--- leave SWI
  -> _mtim_handler 1-th
  <- _mtim_handler
   => _mswi_handler 2-th
   <= _mswi_handler
  -> _mtim_handler 2-th
  <- _mtim_handler
   => _mswi_handler 3-th
   <= _mswi_handler
  -> _mtim_handler 3-th
  <- _mtim_handler
   => _mswi_handler 4-th
   <= _mswi_handler
  -> _mtim_handler 4-th
  <- _mtim_handler
   => _mswi_handler 5-th
   <= _mswi_handler
  done~~~