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124 lines
4.5 KiB
C
124 lines
4.5 KiB
C
/* This file has been prepared for Doxygen automatic documentation generation.*/
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/*! \file *********************************************************************
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*
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* \brief
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* This file contains the low level macros and definition for the USB PLL.
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*
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* \par Application note:
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* AVR280: USB Host CDC Demonstration
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*
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* \par Documentation
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* For comprehensive code documentation, supported compilers, compiler
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* settings and supported devices see readme.html
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*
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* \author
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* Atmel Corporation: http://www.atmel.com \n
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* Support email: avr@atmel.com
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*
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* $Name: $
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* $Revision: 1.1 $
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* $RCSfile: pll_drv.h,v $
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* $Date: 2008/10/14 20:16:36 $ \n
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******************************************************************************/
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/* Copyright (c) 2008 ATMEL Corporation
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the
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distribution.
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* Neither the name of the copyright holders nor the names of
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef PLL_DRV_H
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#define PLL_DRV_H
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//_____ I N C L U D E S ____________________________________________________
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/**
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@addtogroup usb
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@{
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*/
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//_____ M A C R O S ________________________________________________________
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//! @defgroup PLL_macros PLL Macros
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//! These functions allow to control the PLL
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//! @{
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#define PLLx24 ( (0<<PLLP2) | (0<<PLLP1) | (0<<PLLP0) )
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#define PLLx12 ( (0<<PLLP2) | (0<<PLLP1) | (1<<PLLP0) )
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#define PLLx08 ( (0<<PLLP2) | (1<<PLLP1) | (0<<PLLP0) )
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#define PLLx06 ( (0<<PLLP2) | (1<<PLLP1) | (1<<PLLP0) )
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#define PLLx04 ( (1<<PLLP2) | (0<<PLLP1) | (0<<PLLP0) )
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#define PLLx03 ( (1<<PLLP2) | (0<<PLLP1) | (1<<PLLP0) )
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#define PLLx04_8 ( (1<<PLLP2) | (1<<PLLP1) | (0<<PLLP0) )
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#define PLLx02 ( (1<<PLLP2) | (1<<PLLP1) | (1<<PLLP0) )
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//! @brief Start the PLL at only 48 MHz, regarding CPU frequency
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//! Start the USB PLL with clockfactor
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//! clockfactor can be PLLx24, PLLx12, PLLx08
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//! PLLx06, PLLx04, PLLx03
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#define Start_pll(clockfactor) \
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(PLLCSR = ( clockfactor | (1<<PLLE) ))
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//! return 1 when PLL locked
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#define Is_pll_ready() (PLLCSR & (1<<PLOCK) )
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//! Test PLL lock bit and wait until lock is set
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#define Wait_pll_ready() while (!(PLLCSR & (1<<PLOCK)))
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//! Stop the PLL
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#define Stop_pll() (PLLCSR &= (~(1<<PLLE)) )
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// Start the PLL in autofactor mode
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// regarding FOSC define
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#if (FOSC==2000)
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//! Start the PLL in autofactor mode
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//! regarding FOSC define
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#define Pll_start_auto() Start_pll(PLLx24)
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#elif (FOSC==4000)
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#define Pll_start_auto() Start_pll(PLLx12)
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#elif (FOSC==6000)
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#define Pll_start_auto() Start_pll(PLLx08)
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#elif (FOSC==8000)
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//! Start the PLL in autofactor mode
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//! regarding FOSC define
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#define Pll_start_auto() Start_pll(PLLx06)
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#elif (FOSC==12000)
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#define Pll_start_auto() Start_pll(PLLx04)
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#elif (FOSC==16000)
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#define Pll_start_auto() Start_pll(PLLx03)
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#elif (FOSC==20000)
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#define Pll_start_auto() Start_pll(PLLx04_8)
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#elif (FOSC==24000)
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#define Pll_start_auto() Start_pll(PLLx02)
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#else
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#error "FOSC should be defined in config.h"
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#endif
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//! @}
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//! @}
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#endif // PLL_DRV_H
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