95 lines
2.6 KiB
C
95 lines
2.6 KiB
C
/*
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This file is part of the Arduino NINA firmware.
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Copyright (c) 2018 Arduino SA. All rights reserved.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <driver/ledc.h>
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#include <driver/adc.h>
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#include <esp_adc_cal.h>
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#include <soc/adc_channel.h>
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#include "wiring_analog.h"
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void analogWrite(uint32_t pin, uint32_t value)
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{
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periph_module_enable(PERIPH_LEDC_MODULE);
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ledc_timer_config_t timerConf = {
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.bit_num = LEDC_TIMER_10_BIT,
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.freq_hz = 1000,
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.speed_mode = LEDC_HIGH_SPEED_MODE,
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.timer_num = (pin / 7),
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};
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ledc_timer_config(&timerConf);
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ledc_channel_config_t ledc_conf = {
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.channel = (pin % 7),
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.duty = (value << 2),
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.gpio_num = pin,
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.intr_type = LEDC_INTR_DISABLE,
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.speed_mode = LEDC_HIGH_SPEED_MODE,
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.timer_sel = (pin / 7)
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};
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ledc_channel_config(&ledc_conf);
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}
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int analogRead(uint32_t pin, uint32_t atten)
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{
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#define DEFAULT_VREF 1100
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static esp_adc_cal_characteristics_t *adc_chars;
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adc_channel_t channel;
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switch(pin)
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{
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case ADC1_CHANNEL_0_GPIO_NUM:
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channel = ADC1_GPIO36_CHANNEL;
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break;
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case ADC1_CHANNEL_1_GPIO_NUM:
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channel = ADC1_GPIO37_CHANNEL;
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break;
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case ADC1_CHANNEL_2_GPIO_NUM:
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channel = ADC1_GPIO38_CHANNEL;
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break;
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case ADC1_CHANNEL_3_GPIO_NUM:
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channel = ADC1_GPIO39_CHANNEL;
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break;
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case ADC1_CHANNEL_4_GPIO_NUM:
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channel = ADC1_GPIO32_CHANNEL;
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break;
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case ADC1_CHANNEL_5_GPIO_NUM:
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channel = ADC1_GPIO33_CHANNEL;
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break;
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case ADC1_CHANNEL_6_GPIO_NUM:
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channel = ADC1_GPIO34_CHANNEL;
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break;
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case ADC1_CHANNEL_7_GPIO_NUM:
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channel = ADC1_GPIO35_CHANNEL;
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break;
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default:
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return -1;
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}
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adc1_config_width(ADC_WIDTH_BIT_12);
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adc1_config_channel_atten(channel, atten);
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adc_chars = calloc(1, sizeof(esp_adc_cal_characteristics_t));
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esp_adc_cal_characterize(ADC_UNIT_1, atten, ADC_WIDTH_BIT_12, DEFAULT_VREF, adc_chars);
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int val = adc1_get_raw(channel);
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return val;
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}
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