usart_example3.c

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#include <avr32/io.h>
#include <avr32/intc.h>
#include <sys/interrupts.h>


#include "usart.h"
#include "../pio/pio.h"
#include "../debug/print_funcs.h"
#include "../inc/macro.h"
#include "../pdc/pdc.h"

/*
Huskeliste for å forandre innstans:
- USART_ADDR må forandres
- PIOMAP må oppdateres
- Riktig usart modul på apba
*/

/*SETTINGS */
#define USART_ADDR AVR32_USART2_ADDRESS

/*PDC stuff */
char *usart_rx_buf = "1234";
static int usart_rx_buf_size = 4;
char *usart_tx_buf = "From pdc: Type 4 chars";
static int usart_tx_buf_size= 22;

void tick_delay();

__int_handler *usart_int_handler()
{
  volatile avr32_usart_t *usart = (void *) USART_ADDR;

  // RX PDC
        print(usart, "\n" );
        print_hex(usart, usart->csr);
        print(usart, "\n");
    print(usart, pdc_translatePtr(usart_rx_buf) );
        pdc_flushCache( pdc_translatePtr(usart_rx_buf), usart_rx_buf_size );
        pdc_setRxNextBuf( (void *) usart,
                        pdc_translatePtr( usart_rx_buf ), usart_rx_buf_size );

  return (void *) 0;
}


int main( void )
{
  int cpu_hz = 20000000;

  volatile avr32_usart_t *usart = (void *) USART_ADDR;
  struct usart_options_t usart_opt;

  avr32_piomap_t usart_piomap = {                               \
    {AVR32_USART2_RXD_0_PIN, AVR32_USART2_RXD_0_FUNCTION},      \
    {AVR32_USART2_TXD_0_PIN, AVR32_USART2_TXD_0_FUNCTION},      \
    {AVR32_USART0_CLK_0_PIN, AVR32_USART0_CLK_0_FUNCTION},      \
    {AVR32_USART0_CTS_0_PIN, AVR32_USART0_CTS_0_FUNCTION},      \
    {AVR32_USART0_RTS_0_PIN, AVR32_USART0_RTS_0_FUNCTION}       \
  };


  /* Set options for the USART */
  usart_opt.baudrate = 57600;
  usart_opt.charlength = 8;
  usart_opt.paritytype = USART_NO_PARITY;
  usart_opt.stopbits = USART_1_STOPBIT;
  usart_opt.channelmode = USART_NORMAL_CHMODE;

  pio_enable_module( usart_piomap, 5 );
  usart_init_rs232( usart, &usart_opt, cpu_hz);
  print(usart, "\n\n.: USART PDC TEST :.\n");

  /* Setup interrupts */
  set_interrupts_base( (void *) AVR32_INTC_ADDRESS );
  print(usart, "\nInitializing interrupts\n");
  register_interrupt( (__int_handler) (usart_int_handler), AVR32_USART2_IRQ/32, AVR32_USART2_IRQ % 32, INT0);
  usart->ier = AVR32_USART_IER_ENDRX_MASK;

  //print(usart, "Setting up PDC\n");
  pdc_enable( (void *) USART_ADDR );
  pdc_setRxBuf((void *) USART_ADDR,
                (void *) pdc_translatePtr(usart_rx_buf),
                usart_rx_buf_size,
                (void *) 0,
                0);
  pdc_setTxBuf( (void *) USART_ADDR,
                (void *) usart_tx_buf,
                usart_tx_buf_size,
                (void *) 0,
                0);

  init_interrupts();

  while(1)
        tick_delay();

  return 42;

}

void tick_delay()
{
        volatile avr32_usart_t *usart = (void *) USART_ADDR;
        int i;

        for(i=0; i<5000000;i++);
        print(usart, ".");
}

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