Typical Usage of Peripheral Initialization Beans

Init method

Init method that is defined in all Peripheral Initialization Beans. Init method contains a complete initialization of the peripheral according to the bean's settings.

In the following examples, let's assume a bean named "Init1" has been added into the project.

The Init method of the Peripheral Initialization bean can be used in two ways.

• The Init method is called by Processor Expert
• The Init method is called by the user in his/her module

The user can let Processor Expert call the Init method automatically by selecting "yes" for the Call Init method in the Initialization group of the Bean's properties.

When this option is set, Processor Expert places the call of the Init method into the PE_low_level_init function of the CPU.c module.

Add the call of the Init method into the user's code (for example in main module).

Enter the following line into the main module file:

Init1_Init();

Put the Init method right below the PE_low_level_init call.

void main(void)
{
  /*** Processor Expert internal initialization. ***/
  PE_low_level_init();
  /*** End of Processor Expert internal initialization. ***/
  Init1_Init();
  for(;;) {}
}

Interrupt Handling

Some Peripheral Initialization beans allow the initialization of an interrupt service routine. Interrupt(s) can be enabled in initialization code using appropriate properties that can be usually found within a group Interrupts.
After enabling, the specification of an Interrupt Service Routine (ISR) name using the ISR name property is required. This name is generated to Interrupt Vector table during the code generation process.
Please notice that if the ISR name is filled it is generated into the Interrupt Vector Table even if the interrupt property is disabled.

Figure 1 - Example Of The Interrupt Setup

Enabling/disabling peripheral interrupts during runtime has to be done by user's code (for example by utilizing PESL or direct register access macros) because The Peripheral Initialization Beans do not offer any methods for interrupt handling.

The ISR with the specified name has to be declared according to the compiler conventions and fully implemented by the user. Declarations of the ISRs that already do not exist can be generated automatically by PE during the code generation process into the Event module of the CPU bean (name of the CPU event module could be changed in the Advanced view mode of the Bean Inspector) if the project option Project Options | Generate ISR is enabled (this option is visible in the Advanced level of view).

Notice for 56800/E version users: ISRs generated by Processor Expert contain the fast interrupt handling instructions if the interrupt priority is specified as fast interrupt.

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