1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
|
/* This source file is part of the ATMEL AVR-UC3-SoftwareFramework-1.7.0 Release */
/*! \page License
* Copyright (C) 2009, H&D Wireless AB 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 H&D Wireless AB may not be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY H&D WIRELESS AB ``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.
*/
#include <avr32/io.h>
#include "board.h"
#include "clocks.h"
#include "pm.h"
#include "flashc.h"
#include "gpio.h"
/**
* Initializes the MCU system clocks.
*/
void
init_sys_clocks(void)
{
/* switch to OSC0 to speed up the booting */
pm_switch_to_osc0(&AVR32_PM, FOSC0, OSC0_STARTUP);
#ifndef USE_PLL
return;
#endif
/* For audio, ee have to use OSC1 on to generate the correct clockrate
* for the SSC
*/
#if OSC == 1
/* start oscillator1 */
pm_enable_osc1_crystal(&AVR32_PM, FOSC1);
pm_enable_clk1(&AVR32_PM, OSC1_STARTUP);
#endif
/* configure pll multipliers */
pm_pll_setup(&AVR32_PM,
0, /* pll */
PLL_MUL, /* mul */
1, /* div */
OSC, /* osc */
16); /* lockcount */
/* set PLL operating range and divider (fpll = fvco/2)
* this gives PLL output = 66 MHz (62.0928 MHz for EVK1105/OSC1)
*/
pm_pll_set_option(&AVR32_PM,
0, /* pll */
1, /* pll_freq */
1, /* pll_div2 */
0); /* pll_wbwdisable. */
/* start PLL0 and wait for the lock */
pm_pll_enable(&AVR32_PM, 0);
pm_wait_for_pll0_locked(&AVR32_PM);
/* Set all peripheral clocks torun at master clock rate */
pm_cksel(&AVR32_PM,
0, /* pbadiv */
0, /* pbasel */
0, /* pbbdiv */
0, /* pbbsel */
0, /* hsbdiv */
0); /* hsbsel */
/* Set one waitstate for the flash */
flashc_set_wait_state(1);
/* Switch to PLL0 as the master clock */
pm_switch_to_clock(&AVR32_PM, AVR32_PM_MCCTRL_MCSEL_PLL0);
#if OSC == 1
pm_configure_usb_clock();
#endif
}
|
