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
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
|
/**
* \file
*
* \brief Chip-specific system clock management functions.
*
* Copyright (c) 2011-2015 Atmel Corporation. All rights reserved.
*
* \asf_license_start
*
* \page License
*
* 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.
*
* 4. This software may only be redistributed and used in connection with an
* Atmel microcontroller product.
*
* THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT 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.
*
* \asf_license_stop
*
*/
/*
* Support and FAQ: visit <a href="https://www.atmel.com/design-support/">Atmel Support</a>
*/
#ifdef ARDUINO_ARCH_SAM
#include "sysclk.h"
/// @cond 0
/**INDENT-OFF**/
#ifdef __cplusplus
extern "C" {
#endif
/**INDENT-ON**/
/// @endcond
/**
* \weakgroup sysclk_group
* @{
*/
#if defined(CONFIG_USBCLK_SOURCE) || defined(__DOXYGEN__)
/**
* \brief Enable full speed USB clock.
*
* \note The SAM3X PMC hardware interprets div as div+1. For readability the hardware div+1
* is hidden in this implementation. Use div as div effective value.
*
* \param pll_id Source of the USB clock.
* \param div Actual clock divisor. Must be superior to 0.
*/
void sysclk_enable_usb(void)
{
Assert(CONFIG_USBCLK_DIV > 0);
#ifdef CONFIG_PLL0_SOURCE
if (CONFIG_USBCLK_SOURCE == USBCLK_SRC_PLL0) {
struct pll_config pllcfg;
pll_enable_source(CONFIG_PLL0_SOURCE);
pll_config_defaults(&pllcfg, 0);
pll_enable(&pllcfg, 0);
pll_wait_for_lock(0);
pmc_switch_udpck_to_pllack(CONFIG_USBCLK_DIV - 1);
pmc_enable_udpck();
return;
}
#endif
if (CONFIG_USBCLK_SOURCE == USBCLK_SRC_UPLL) {
pmc_enable_upll_clock();
pmc_switch_udpck_to_upllck(CONFIG_USBCLK_DIV - 1);
pmc_enable_udpck();
return;
}
}
/**
* \brief Disable full speed USB clock.
*
* \note This implementation does not switch off the PLL, it just turns off the USB clock.
*/
void sysclk_disable_usb(void)
{
pmc_disable_udpck();
}
#endif // CONFIG_USBCLK_SOURCE
//! @}
/// @cond 0
/**INDENT-OFF**/
#ifdef __cplusplus
}
#endif
/**INDENT-ON**/
/// @endcond
#endif // ARDUINO_ARCH_SAM
|
