93 lines
3.0 KiB
C
93 lines
3.0 KiB
C
/*
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* This file is part of the Micro Python 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) 2017 Dan Halbert 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 "hpl/gclk/hpl_gclk_base.h"
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#include "hpl/pm/hpl_pm_base.h"
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// The clock initializer values are rather random, so we need to put them in
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// tables for lookup. We can't compute them.
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static const uint8_t SERCOMx_GCLK_ID_CORE[] = {
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SERCOM0_GCLK_ID_CORE,
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SERCOM1_GCLK_ID_CORE,
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SERCOM2_GCLK_ID_CORE,
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SERCOM3_GCLK_ID_CORE,
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#ifdef SERCOM4
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SERCOM4_GCLK_ID_CORE,
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#endif
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#ifdef SERCOM5
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SERCOM5_GCLK_ID_CORE,
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#endif
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};
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static const uint8_t SERCOMx_GCLK_ID_SLOW[] = {
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SERCOM0_GCLK_ID_SLOW,
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SERCOM1_GCLK_ID_SLOW,
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SERCOM2_GCLK_ID_SLOW,
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SERCOM3_GCLK_ID_SLOW,
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#ifdef SERCOM4
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SERCOM4_GCLK_ID_SLOW,
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#endif
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#ifdef SERCOM5
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SERCOM5_GCLK_ID_SLOW,
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#endif
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};
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// Clock initialization as done in Atmel START.
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void samd_peripherals_sercom_clock_init(Sercom* sercom, uint8_t sercom_index) {
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_pm_enable_bus_clock(PM_BUS_APBC, sercom);
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_gclk_enable_channel(SERCOMx_GCLK_ID_CORE[sercom_index], GCLK_CLKCTRL_GEN_GCLK0_Val);
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_gclk_enable_channel(SERCOMx_GCLK_ID_SLOW[sercom_index], GCLK_CLKCTRL_GEN_GCLK3_Val);
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}
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// Figure out the DOPO value given the chosen clock pad and mosi pad.
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// Return an out-of-range value (255) if the combination is not permitted.
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// <0x0=>PAD[0,1]_DO_SCK
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// <0x1=>PAD[2,3]_DO_SCK
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// <0x2=>PAD[3,1]_DO_SCK
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// <0x3=>PAD[0,3]_DO_SCK
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uint8_t samd_peripherals_get_spi_dopo(uint8_t clock_pad, uint8_t mosi_pad) {
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if (clock_pad == 1) {
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if (mosi_pad == 0) {
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return 0;
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} else if (mosi_pad == 3) {
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return 2;
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}
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} else if (clock_pad == 3) {
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if (mosi_pad == 0) {
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return 3;
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} else if (mosi_pad == 2) {
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return 1;
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}
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}
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return 255;
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}
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bool samd_peripherals_valid_spi_clock_pad(uint8_t clock_pad) {
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return clock_pad == 1 || clock_pad == 3;
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}
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