| AVR1600 Using the XMEGA Quadrature Decoder

Macros
avr_compiler.h File Reference

This file implements some macros that makes the IAR C-compiler and avr-gcc work with the same code base for the AVR architecture. More...

`#include <stdint.h>`
`#include <stdbool.h>`
`#include <stdlib.h>`
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## Macros
#define | AVR_ENTER_CRITICAL_REGION()
| This macro will protect the following code from interrupts. More...
#define | AVR_LEAVE_CRITICAL_REGION() SREG = saved_sreg;
| This macro must always be used in conjunction with AVR_ENTER_CRITICAL_REGION so the interrupts are enabled again. More...
#define | F_CPU 2000000UL
| Define default CPU frequency, if this is not already defined. More...

## Detailed Description

This file implements some macros that makes the IAR C-compiler and avr-gcc work with the same code base for the AVR architecture.

Documentation
  For comprehensive code documentation, supported compilers, compiler settings and supported devices see readme.html

Author
  Atmel Corporation, now Microchip Technology Inc.: http://www.microchip.com

Revision
  7623

Date
  2017-09-06 14:57:02 +0200 (on, 06 sep 2017)

Copyright (c) 2008, Atmel Corporation All rights reserved.

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.

THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 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.

Definition in file avr_compiler.h.

## Macro Definition Documentation

## ◆ AVR_ENTER_CRITICAL_REGION

#define AVR_ENTER_CRITICAL_REGION | ( |  | ) |

Value:
uint8_t volatile saved_sreg = SREG; \
cli();

This macro will protect the following code from interrupts.

Definition at line 57 of file avr_compiler.h.

## ◆ AVR_LEAVE_CRITICAL_REGION

#define AVR_LEAVE_CRITICAL_REGION | ( |  | ) | SREG = saved_sreg;

This macro must always be used in conjunction with AVR_ENTER_CRITICAL_REGION so the interrupts are enabled again.

Definition at line 63 of file avr_compiler.h.

## ◆ F_CPU

#define F_CPU 2000000UL

Define default CPU frequency, if this is not already defined.

Definition at line 49 of file avr_compiler.h.

Referenced by generate_qdec_signal(), and main().

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