102 lines
3.5 KiB
C
102 lines
3.5 KiB
C
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/* This source file is part of the ATMEL AVR-UC3-SoftwareFramework-1.7.0 Release */
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/*! \page License
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* Copyright (C) 2009, H&D Wireless AB All rights reserved.
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*
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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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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3. The name of H&D Wireless AB may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY H&D WIRELESS AB ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSLY AND
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* SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <avr32/io.h>
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#include "board.h"
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#include "clocks.h"
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#include "pm.h"
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#include "flashc.h"
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#include "gpio.h"
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/**
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* Initializes the MCU system clocks.
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*/
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void
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init_sys_clocks(void)
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{
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/* switch to OSC0 to speed up the booting */
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pm_switch_to_osc0(&AVR32_PM, FOSC0, OSC0_STARTUP);
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#ifndef USE_PLL
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return;
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#endif
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/* For audio, ee have to use OSC1 on to generate the correct clockrate
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* for the SSC
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*/
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#if OSC == 1
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/* start oscillator1 */
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pm_enable_osc1_crystal(&AVR32_PM, FOSC1);
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pm_enable_clk1(&AVR32_PM, OSC1_STARTUP);
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#endif
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/* configure pll multipliers */
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pm_pll_setup(&AVR32_PM,
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0, /* pll */
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PLL_MUL, /* mul */
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1, /* div */
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OSC, /* osc */
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16); /* lockcount */
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/* set PLL operating range and divider (fpll = fvco/2)
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* this gives PLL output = 66 MHz (62.0928 MHz for EVK1105/OSC1)
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*/
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pm_pll_set_option(&AVR32_PM,
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0, /* pll */
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1, /* pll_freq */
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1, /* pll_div2 */
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0); /* pll_wbwdisable. */
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/* start PLL0 and wait for the lock */
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pm_pll_enable(&AVR32_PM, 0);
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pm_wait_for_pll0_locked(&AVR32_PM);
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/* Set all peripheral clocks torun at master clock rate */
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pm_cksel(&AVR32_PM,
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0, /* pbadiv */
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0, /* pbasel */
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0, /* pbbdiv */
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0, /* pbbsel */
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0, /* hsbdiv */
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0); /* hsbsel */
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/* Set one waitstate for the flash */
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flashc_set_wait_state(1);
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/* Switch to PLL0 as the master clock */
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pm_switch_to_clock(&AVR32_PM, AVR32_PM_MCCTRL_MCSEL_PLL0);
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#if OSC == 1
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pm_configure_usb_clock();
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#endif
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}
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