pio_example3_pins_and_pio_connectivity.c

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#include "pio.h"

#ifdef __GNUC__
        #include <avr32/io.h>
#elif __ICCAVR32__
        #include <avr32/ioap7000.h>
#else
        #error No known compiler used
#endif


#define SUCCESS 0
#define CPU_HZ 20000000

#define PIN_MASK 0x000000ff

/* Prototype */
void delay( void );


int main( void )
{
  /*
    For this example to work, connect J15 to J1
  */

  volatile avr32_pio_t *piob = &AVR32_PIOB;

  /*
    The gcc header files contains pinout information. Each pin is numbered with a positive integer. 
    This number is between 0 and the number of pins of your chosen device. If you divide the it by 32,
    you will get the port number. I.e. 34 / 32 is 1. That means that pin 34 is part of port B. 
    Then, if the modulo 32 is calculted, you will get the pin number on the port. I.e. 34 % 32 is 2.
    Thus, the pin description 34 gives PORTB, pin 2.

    In addition each pin is connected to the PIO Controller. The actual pin can be driven by the PIO 
    Controller itself or by one of the two possible connected modules.

    Each I/O pin of a module is described in the header files in the following way;
    AVR32_{module}{instance}_{pin}_{mapping_instance}_PIN, i.e AVR32_USART1_RXD_0_PIN

    A specific I/O can be connected to one of the two possible connection, as is described in the header 
    files as:
    AVR32_{module}{instance}_{pin}_{mapping_instance}_FUNCTION, i.e AVR32_USART1_RXD_0_FUNCTION

    The FUNCTION definition of a pin can either be 0 or 1, which indicates if it is connected to module A or B of the 
    PIO Controller, respectively.

    This information can be used to enble the set of pins you need for I/O for module communication.

    Note: The mapping instance is used whenever a specific output is routed to several pins. When a single I/O from
    a module is routed to only one pin, 0 is always used.

  */

  /* bit 0..7 on port B is set as output */
  piob->per = PIN_MASK; /* Set pio enable for 16 LSBs of PORTB */
  piob->oer = PIN_MASK; /* Make them output ports */
  piob->idr = PIN_MASK; /* Disable interrupts on these pins */
  piob->puer = PIN_MASK; /* Enable pull-ups */
  piob->ower = PIN_MASK; /* Enable writing for the ODSR I/O line */
  piob->codr = PIN_MASK; /* Clear output */

  /* A list of pins to set under a module's control is generated */
  avr32_piomap_t test_piomap = {
   {32, 0}, /* port B, pin 0 */
   {33, 0} /* port B, pin 1 */
  };

 /* These pins are set under the module's control */
 pio_enable_module(test_piomap,2);
  
 /* We will toggle the leds */
 while(1){
   piob->odsr = ~(piob->odsr & PIN_MASK);
   delay();
   /* 
      Note: You will see that only LED[2..7] toggles, as LED[0..1] is put under module A's control.
      These data from the PIO controller is not pushed out the pin.
   */
 }
   
   return SUCCESS;
}


void delay ( void )
{
  int i;

  for(i=0; i< (CPU_HZ/4); i++);

}

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