registers/UserApplication.c

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/* This file has been prepared for Doxygen automatic documentation generation.*/
/**
 * \file
 *
 * \brief This is a demo application for the CPU registers test.
 * 
 *              The test is called from a button interrupt. If there is an error 
 *              the CPU goes to an infinite loop or sets the global error flag 
 *              \ref classb_error. This depends on the kind of error and the 
 *              user configuration.
 *              
 * \par Application note:
 *      AVR1610: Guide to IEC60730 Class B compliance with XMEGA
 *
 * \par Documentation
 *      For comprehensive code documentation, supported compilers, compiler 
 *      settings and supported devices see readme.html
 *
 * \author
 *      Atmel Corporation: http://www.atmel.com \n
 *      Support email: avr@atmel.com
 * 
 * Copyright (C) 2012 Atmel Corporation. All rights reserved.
 *
 * \page License
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3. The name of Atmel may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 *
 * 4. This software may only be redistributed and used in connection with an
 * Atmel AVR product.
 *
 * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
 * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */
#include "avr_compiler.h"
#include "classb_cpu.h"

NO_INIT volatile uint8_t classb_error;

// TODO: add doc
#if __AVR_ATxmega256A3BU__ | __ATxmega256A3BU__
#  define LEDPORT PORTR
#  define SWITCHPORT PORTE
#  define SWITCH_INT0_vect PORTE_INT0_vect
#  define XPLAIN_PULLUP 0x00
#elif defined(__AVR_ATxmega128A1__) | defined(__ATxmega128A1__)
#  define LEDPORT PORTE
#  define SWITCHPORT PORTF
#  define SWITCH_INT0_vect PORTF_INT0_vect
#  define XPLAIN_PULLUP PORT_OPC_PULLUP_gc
#endif

//! \brief Sets up LEDs and switches.
void setup_led_switches() {

        // Set direction and state of LED pin
        LEDPORT.DIRSET = PIN0_bm;
        PORTCFG.MPCMASK = PIN0_bm;
        LEDPORT.PIN0CTRL |= PORT_INVEN_bm;
        
        // Set sensitivity, polarity and pullup for button PIN
        SWITCHPORT.PIN5CTRL = PORT_ISC_FALLING_gc | PORT_INVEN_bm | XPLAIN_PULLUP;
        SWITCHPORT.INT0MASK |= PIN5_bm;
        SWITCHPORT.INTCTRL |= PORT_INT0LVL_LO_gc;
        
        // Enable LOW level interrupts in the INT controller
        PMIC.CTRL |= PMIC_LOLVLEN_bm;
        
        // Turn on LED that signals correct operation.
        LEDPORT.OUTSET = PIN0_bm;
}
/*! \brief
 *              Main entry point of the application.
 *              \callgraph
 */
int main(void)
{
        setup_led_switches();
        
        // Enable interrupts globally
        sei();
        
    while(!classb_error) { 
                /* Do nothing */
        };
        
        // If we reach here, an error has been detected. Turn off LED.
        LEDPORT.OUTCLR = PIN0_bm;
}


/*! \brief
 *              The button interrupt is used to call the self-diagnostic routine. 
 *  \callgraph
 */
ISR(SWITCH_INT0_vect) {

        // Disable interrupts globally
        cli();

        // Run the CPU test, the return value is not considered because 
        // the test changes the global \ref classb_error in the case of an error. 
        classb_register_test();
        
        // Enable interrupts globally.
        sei();
}