48 lines
2.2 KiB
C
48 lines
2.2 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 "hal/include/hal_adc_sync.h"
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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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// Do initialization and calibration setup needed for any use of the ADC.
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// The reference and resolution should be set by the caller.
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void samd_peripherals_adc_setup(struct adc_sync_descriptor *adc, Adc *instance) {
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// Turn the clocks on.
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_pm_enable_bus_clock(PM_BUS_APBC, ADC);
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_gclk_enable_channel(ADC_GCLK_ID, GCLK_CLKCTRL_GEN_GCLK0_Val);
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adc_sync_init(adc, instance, (void *)NULL);
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// Load the factory calibration
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hri_adc_write_CALIB_BIAS_CAL_bf(ADC, (*((uint32_t*) ADC_FUSES_BIASCAL_ADDR) & ADC_FUSES_BIASCAL_Msk) >> ADC_FUSES_BIASCAL_Pos);
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// Bits 7:5
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uint16_t linearity = ((*((uint32_t*) ADC_FUSES_LINEARITY_1_ADDR) & ADC_FUSES_LINEARITY_1_Msk) >> ADC_FUSES_LINEARITY_1_Pos) << 5;
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// Bits 4:0
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linearity |= (*((uint32_t*) ADC_FUSES_LINEARITY_0_ADDR) & ADC_FUSES_LINEARITY_0_Msk) >> ADC_FUSES_LINEARITY_0_Pos;
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hri_adc_write_CALIB_LINEARITY_CAL_bf(ADC, linearity);
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}
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