You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
76 lines
2.1 KiB
76 lines
2.1 KiB
2 months ago
|
/** @addtogroup scif
|
||
|
|
*
|
||
|
|
* @brief <b>Access functions for the SAM4 Power Manager (PM)</b>
|
||
|
|
* @ingroup SAM4
|
||
|
|
* LGPL License Terms @ref lgpl_license
|
||
|
|
* @author @htmlonly © @endhtmlonly 2016
|
||
|
|
* Maxim Sloyko <maxims@google.com>
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*
|
||
|
|
* This file is part of the libopencm3 project.
|
||
|
|
*
|
||
|
|
* This library is free software: you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU Lesser General Public License as published by
|
||
|
|
* the Free Software Foundation, either version 3 of the License, or
|
||
|
|
* (at your option) any later version.
|
||
|
|
*
|
||
|
|
* This library is distributed in the hope that it will be useful,
|
||
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
* GNU Lesser General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU Lesser General Public License
|
||
|
|
* along with this library. If not, see <http://www.gnu.org/licenses/>.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <libopencm3/sam/pm.h>
|
||
|
|
|
||
|
|
void pm_select_main_clock(enum mck_src source_clock)
|
||
|
|
{
|
||
|
|
PM_UNLOCK = PM_MCCTRL_KEY;
|
||
|
|
PM_MCCTRL = ((source_clock & PM_MCCTRL_MCSEL_MASK) << PM_MCCTRL_MCSEL_SHIFT);
|
||
|
|
while (!(PM_SR & PM_SR_CKRDY));
|
||
|
|
}
|
||
|
|
|
||
|
|
void pm_enable_clock_div(enum pm_cksel sel_target, uint8_t div)
|
||
|
|
{
|
||
|
|
while (!(PM_SR & PM_SR_CKRDY));
|
||
|
|
uint32_t reg = (PM_CKSEL_DIV | (div & PM_CKSEL_MASK));
|
||
|
|
|
||
|
|
PM_UNLOCK = PM_CKSEL_KEY(sel_target);
|
||
|
|
PM_CKSEL(sel_target) = reg;
|
||
|
|
while (!(PM_SR & PM_SR_CKRDY));
|
||
|
|
}
|
||
|
|
|
||
|
|
void pm_set_divmask_clock(uint8_t mask)
|
||
|
|
{
|
||
|
|
PM_UNLOCK = PM_PBADIVMASK_KEY;
|
||
|
|
PM_PBADIVMASK = mask;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void set_peripheral_clock_status(enum pm_peripheral periph, bool on)
|
||
|
|
{
|
||
|
|
uint8_t reg_id = periph/32;
|
||
|
|
uint8_t bit_offset = periph % 32;
|
||
|
|
uint32_t reg_mask = PM_MASK(reg_id);
|
||
|
|
if (on) {
|
||
|
|
reg_mask |= (1 << bit_offset);
|
||
|
|
} else {
|
||
|
|
reg_mask &= ~(1 << bit_offset);
|
||
|
|
}
|
||
|
|
PM_UNLOCK = PM_MASK_KEY(reg_id);
|
||
|
|
PM_MASK(reg_id) = reg_mask;
|
||
|
|
}
|
||
|
|
|
||
|
|
void pm_enable_peripheral_clock(enum pm_peripheral periph)
|
||
|
|
{
|
||
|
|
set_peripheral_clock_status(periph, true);
|
||
|
|
}
|
||
|
|
|
||
|
|
void pm_disable_peripheral_clock(enum pm_peripheral periph)
|
||
|
|
{
|
||
|
|
set_peripheral_clock_status(periph, false);
|
||
|
|
}
|