62 lines
3.0 KiB
C
62 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 "hal/include/hal_adc_sync.h"
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#include "hpl/gclk/hpl_gclk_base.h"
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#include "hri/hri_mclk_d51.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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if (instance == ADC0) {
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hri_mclk_set_APBDMASK_ADC0_bit(MCLK);
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hri_gclk_write_PCHCTRL_reg(GCLK, ADC0_GCLK_ID, GCLK_PCHCTRL_GEN_GCLK1_Val | (1 << GCLK_PCHCTRL_CHEN_Pos));
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} else if (instance == ADC1) {
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hri_mclk_set_APBDMASK_ADC1_bit(MCLK);
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hri_gclk_write_PCHCTRL_reg(GCLK, ADC1_GCLK_ID, GCLK_PCHCTRL_GEN_GCLK1_Val | (1 << GCLK_PCHCTRL_CHEN_Pos));
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}
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adc_sync_init(adc, instance, (void *)NULL);
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// SAMD51 has a CALIB register but doesn't have documented fuses for them.
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uint8_t biasrefbuf;
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uint8_t biasr2r;
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uint8_t biascomp;
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if (instance == ADC0) {
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biasrefbuf = ((*(uint32_t*) ADC0_FUSES_BIASREFBUF_ADDR) & ADC0_FUSES_BIASREFBUF_Msk) >> ADC0_FUSES_BIASREFBUF_Pos;
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biasr2r = ((*(uint32_t*) ADC0_FUSES_BIASR2R_ADDR) & ADC0_FUSES_BIASR2R_Msk) >> ADC0_FUSES_BIASR2R_Pos;
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biascomp = ((*(uint32_t*) ADC0_FUSES_BIASCOMP_ADDR) & ADC0_FUSES_BIASCOMP_Msk) >> ADC0_FUSES_BIASCOMP_Pos;
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} else {
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biasrefbuf = ((*(uint32_t*) ADC1_FUSES_BIASREFBUF_ADDR) & ADC1_FUSES_BIASREFBUF_Msk) >> ADC1_FUSES_BIASREFBUF_Pos;
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biasr2r = ((*(uint32_t*) ADC1_FUSES_BIASR2R_ADDR) & ADC1_FUSES_BIASR2R_Msk) >> ADC1_FUSES_BIASR2R_Pos;
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biascomp = ((*(uint32_t*) ADC1_FUSES_BIASCOMP_ADDR) & ADC1_FUSES_BIASCOMP_Msk) >> ADC1_FUSES_BIASCOMP_Pos;
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}
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hri_adc_write_CALIB_BIASREFBUF_bf(instance, biasrefbuf);
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hri_adc_write_CALIB_BIASR2R_bf(instance, biasr2r);
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hri_adc_write_CALIB_BIASCOMP_bf(instance, biascomp);
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}
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