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00001 /* This file has been prepared for Doxygen automatic documentation generation.*/ 00002 /*! \file ********************************************************************* 00003 * 00004 * \brief 00005 * This file contains the low level macros and definition for the USB PLL. 00006 * 00007 * \par Application note: 00008 * AVR280: USB Host CDC Demonstration 00009 * 00010 * \par Documentation 00011 * For comprehensive code documentation, supported compilers, compiler 00012 * settings and supported devices see readme.html 00013 * 00014 * \author 00015 * Atmel Corporation: http://www.atmel.com \n 00016 * Support email: avr@atmel.com 00017 * 00018 * $Name: $ 00019 * $Revision: 1.1 $ 00020 * $RCSfile: pll_drv.h,v $ 00021 * $Date: 2008/10/14 20:16:36 $ \n 00022 * $Id: pll_drv.h,v 1.1 2008/10/14 20:16:36 c_oflynn Exp $ 00023 ******************************************************************************/ 00024 /* Copyright (c) 2008 ATMEL Corporation 00025 All rights reserved. 00026 00027 Redistribution and use in source and binary forms, with or without 00028 modification, are permitted provided that the following conditions are met: 00029 00030 * Redistributions of source code must retain the above copyright 00031 notice, this list of conditions and the following disclaimer. 00032 * Redistributions in binary form must reproduce the above copyright 00033 notice, this list of conditions and the following disclaimer in 00034 the documentation and/or other materials provided with the 00035 distribution. 00036 * Neither the name of the copyright holders nor the names of 00037 contributors may be used to endorse or promote products derived 00038 from this software without specific prior written permission. 00039 00040 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 00041 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 00042 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 00043 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 00044 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 00045 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 00046 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 00047 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 00048 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 00049 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 00050 POSSIBILITY OF SUCH DAMAGE. 00051 */ 00052 00053 #ifndef PLL_DRV_H 00054 #define PLL_DRV_H 00055 00056 //_____ I N C L U D E S ____________________________________________________ 00057 00058 /** 00059 @addtogroup usb 00060 @{ 00061 */ 00062 //_____ M A C R O S ________________________________________________________ 00063 00064 //! @defgroup PLL_macros PLL Macros 00065 //! These functions allow to control the PLL 00066 //! @{ 00067 #define PLLx24 ( (0<<PLLP2) | (0<<PLLP1) | (0<<PLLP0) ) 00068 #define PLLx12 ( (0<<PLLP2) | (0<<PLLP1) | (1<<PLLP0) ) 00069 #define PLLx08 ( (0<<PLLP2) | (1<<PLLP1) | (0<<PLLP0) ) 00070 #define PLLx06 ( (0<<PLLP2) | (1<<PLLP1) | (1<<PLLP0) ) 00071 #define PLLx04 ( (1<<PLLP2) | (0<<PLLP1) | (0<<PLLP0) ) 00072 #define PLLx03 ( (1<<PLLP2) | (0<<PLLP1) | (1<<PLLP0) ) 00073 #define PLLx04_8 ( (1<<PLLP2) | (1<<PLLP1) | (0<<PLLP0) ) 00074 #define PLLx02 ( (1<<PLLP2) | (1<<PLLP1) | (1<<PLLP0) ) 00075 00076 00077 //! @brief Start the PLL at only 48 MHz, regarding CPU frequency 00078 //! Start the USB PLL with clockfactor 00079 //! clockfactor can be PLLx24, PLLx12, PLLx08 00080 //! PLLx06, PLLx04, PLLx03 00081 #define Start_pll(clockfactor) \ 00082 (PLLCSR = ( clockfactor | (1<<PLLE) )) 00083 00084 //! return 1 when PLL locked 00085 #define Is_pll_ready() (PLLCSR & (1<<PLOCK) ) 00086 00087 //! Test PLL lock bit and wait until lock is set 00088 #define Wait_pll_ready() while (!(PLLCSR & (1<<PLOCK))) 00089 00090 //! Stop the PLL 00091 #define Stop_pll() (PLLCSR &= (~(1<<PLLE)) ) 00092 00093 // Start the PLL in autofactor mode 00094 // regarding FOSC define 00095 #if (FOSC==2000) 00096 //! Start the PLL in autofactor mode 00097 //! regarding FOSC define 00098 #define Pll_start_auto() Start_pll(PLLx24) 00099 #elif (FOSC==4000) 00100 #define Pll_start_auto() Start_pll(PLLx12) 00101 #elif (FOSC==6000) 00102 #define Pll_start_auto() Start_pll(PLLx08) 00103 #elif (FOSC==8000) 00104 //! Start the PLL in autofactor mode 00105 //! regarding FOSC define 00106 #define Pll_start_auto() Start_pll(PLLx06) 00107 #elif (FOSC==12000) 00108 #define Pll_start_auto() Start_pll(PLLx04) 00109 #elif (FOSC==16000) 00110 #define Pll_start_auto() Start_pll(PLLx03) 00111 #elif (FOSC==20000) 00112 #define Pll_start_auto() Start_pll(PLLx04_8) 00113 #elif (FOSC==24000) 00114 #define Pll_start_auto() Start_pll(PLLx02) 00115 #else 00116 #error "FOSC should be defined in config.h" 00117 #endif 00118 00119 //! @} 00120 00121 //! @} 00122 #endif // PLL_DRV_H 00123 00124