85 lines
2.9 KiB
C
85 lines
2.9 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2018 Scott Shawcroft for Adafruit Industries
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "i2s.h"
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#include "clocks.h"
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#include "hpl/gclk/hpl_gclk_base.h"
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#ifdef SAMD21
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#include "hpl/pm/hpl_pm_base.h"
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#endif
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void turn_on_i2s(void) {
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// Make sure the I2S peripheral is running so we can see if the resources we need are free.
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#ifdef SAMD51
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hri_mclk_set_APBDMASK_I2S_bit(MCLK);
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// Connect the clock units to the 2mhz clock by default. They can't reset without it.
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connect_gclk_to_peripheral(5, I2S_GCLK_ID_0);
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connect_gclk_to_peripheral(5, I2S_GCLK_ID_1);
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#endif
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#ifdef SAMD21
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_pm_enable_bus_clock(PM_BUS_APBC, I2S);
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#endif
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}
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void i2s_set_enable(bool enable) {
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while (I2S->SYNCBUSY.bit.ENABLE == 1) {}
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I2S->CTRLA.bit.ENABLE = enable;
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while (I2S->SYNCBUSY.bit.ENABLE == 1) {}
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}
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void i2s_set_clock_unit_enable(uint8_t clock_unit, bool enable) {
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while ((I2S->SYNCBUSY.vec.CKEN & (1 << clock_unit)) != 0) {}
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I2S->CTRLA.vec.CKEN = 1 << clock_unit;
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while ((I2S->SYNCBUSY.vec.CKEN & (1 << clock_unit)) != 0) {}
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}
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void i2s_set_serializer_enable(uint8_t serializer, bool enable) {
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#ifdef SAMD21
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while ((I2S->SYNCBUSY.vec.SEREN & (1 << serializer)) != 0) {}
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if (enable) {
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I2S->CTRLA.vec.SEREN = 1 << serializer;
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} else {
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I2S->CTRLA.vec.SEREN &= ~(1 << serializer);
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}
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while ((I2S->SYNCBUSY.vec.SEREN & (1 << serializer)) != 0) {}
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#endif
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#ifdef SAMD51
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if (serializer == 0) {
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while (I2S->SYNCBUSY.bit.TXEN == 1) {}
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I2S->CTRLA.bit.TXEN = enable;
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while (I2S->SYNCBUSY.bit.TXEN == 1) {}
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} else {
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while (I2S->SYNCBUSY.bit.RXEN == 1) {}
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I2S->CTRLA.bit.RXEN = enable;
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while (I2S->SYNCBUSY.bit.RXEN == 1) {}
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}
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#endif
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}
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