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