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https://github.com/arabine/open-story-teller.git
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77 lines
3 KiB
C
77 lines
3 KiB
C
/*
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* Copyright (c) 2016, Alex Taradov <alex@taradov.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*- Includes ----------------------------------------------------------------*/
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#include <stdlib.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include "samd21.h"
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#include "hal_gpio.h"
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#include "nvm_data.h"
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#include "dac.h"
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/*- Definitions -------------------------------------------------------------*/
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HAL_GPIO_PIN(ADC, A, 3)
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/*- Implementations ---------------------------------------------------------*/
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//-----------------------------------------------------------------------------
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void adc_init(void)
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{
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HAL_GPIO_ADC_in();
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HAL_GPIO_ADC_pmuxen(HAL_GPIO_PMUX_B);
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PM->APBCMASK.reg |= PM_APBCMASK_ADC;
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GCLK->CLKCTRL.reg = GCLK_CLKCTRL_ID(ADC_GCLK_ID) |
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GCLK_CLKCTRL_CLKEN | GCLK_CLKCTRL_GEN(0);
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ADC->CTRLA.reg = ADC_CTRLA_SWRST;
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while (ADC->CTRLA.reg & ADC_CTRLA_SWRST);
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ADC->REFCTRL.reg = ADC_REFCTRL_REFSEL_INTVCC1 | ADC_REFCTRL_REFCOMP;
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ADC->CTRLB.reg = ADC_CTRLB_RESSEL_16BIT | ADC_CTRLB_PRESCALER_DIV32;
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ADC->AVGCTRL.reg = ADC_AVGCTRL_SAMPLENUM_128;
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ADC->INPUTCTRL.reg = ADC_INPUTCTRL_MUXPOS_PIN1 | ADC_INPUTCTRL_MUXNEG_GND |
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ADC_INPUTCTRL_GAIN_DIV2;
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ADC->CALIB.reg = ADC_CALIB_BIAS_CAL(NVM_READ_CAL(ADC_BIASCAL)) |
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ADC_CALIB_LINEARITY_CAL(NVM_READ_CAL(ADC_LINEARITY));
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ADC->CTRLA.reg = ADC_CTRLA_ENABLE;
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}
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//-----------------------------------------------------------------------------
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int adc_read(void)
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{
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ADC->SWTRIG.reg = ADC_SWTRIG_START;
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while (0 == (ADC->INTFLAG.reg & ADC_INTFLAG_RESRDY));
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return ADC->RESULT.reg;
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}
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