kopia lustrzana https://github.com/micropython/micropython
124 wiersze
4.7 KiB
C
124 wiersze
4.7 KiB
C
/*
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* This file is part of the MicroPython 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) 2019 Damien P. George
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* Copyright (c) 2021,2022 Renesas Electronics Corporation
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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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// This file is never compiled standalone, it's included directly from
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// extmod/machine_adc.c via MICROPY_PY_MACHINE_ADC_INCLUDEFILE.
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#include "py/mphal.h"
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#include "ra_adc.h"
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#define ADC_SAMPLETIME_DEFAULT 1
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#define ADC_CHANNEL_VREFINT (ADC_REF)
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#define ADC_CHANNEL_TEMPSENSOR (ADC_TEMP)
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#define ADC_SAMPLETIME_DEFAULT_INT 1
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typedef struct {
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uint8_t dummy;
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} ADC_TypeDef;
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// Timeout for waiting for end-of-conversion
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#define ADC_EOC_TIMEOUT_MS (10)
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// This is a synthesised channel representing the maximum ADC reading (useful to scale other channels)
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#define ADC_CHANNEL_VREF (0xffff)
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/******************************************************************************/
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// MicroPython bindings for machine.ADC
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#if defined(ADC_CHANNEL_VBAT)
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#define MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS_CORE_VBAT \
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{ MP_ROM_QSTR(MP_QSTR_CORE_VBAT), MP_ROM_INT(ADC_CHANNEL_VBAT) },
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#else
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#define MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS_CORE_VBAT
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#endif
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#define MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS \
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{ MP_ROM_QSTR(MP_QSTR_VREF), MP_ROM_INT(ADC_CHANNEL_VREF) }, \
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{ MP_ROM_QSTR(MP_QSTR_CORE_VREF), MP_ROM_INT(ADC_CHANNEL_VREFINT) }, \
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{ MP_ROM_QSTR(MP_QSTR_CORE_TEMP), MP_ROM_INT(ADC_CHANNEL_TEMPSENSOR) }, \
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MICROPY_PY_MACHINE_ADC_CLASS_CONSTANTS_CORE_VBAT \
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typedef struct _machine_adc_obj_t {
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mp_obj_base_t base;
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ADC_TypeDef *adc;
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uint32_t channel;
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uint32_t pin;
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uint32_t sample_time;
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} machine_adc_obj_t;
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static void mp_machine_adc_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
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machine_adc_obj_t *self = MP_OBJ_TO_PTR(self_in);
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uint8_t resolution = (uint8_t)ra_adc_get_resolution();
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mp_printf(print, "<ADC%u channel=%u>", resolution, self->channel);
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}
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// ADC(id)
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static mp_obj_t mp_machine_adc_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
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// Check number of arguments
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mp_arg_check_num(n_args, n_kw, 1, 1, false);
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mp_obj_t source = all_args[0];
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bool find = false;
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uint8_t channel;
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uint32_t pin;
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uint32_t sample_time = ADC_SAMPLETIME_DEFAULT;
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if (mp_obj_is_int(source)) {
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channel = (uint8_t)mp_obj_get_int(source);
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find = ra_adc_ch_to_pin((uint8_t)channel, (uint32_t *)&pin);
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if (!find) {
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mp_raise_msg_varg(&mp_type_ValueError, MP_ERROR_TEXT("Channel(%q) does not have ADC capabilities"), channel);
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}
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} else {
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const machine_pin_obj_t *pin_obj = machine_pin_find(source);
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find = ra_adc_pin_to_ch((uint32_t)pin_obj->pin, (uint8_t *)&channel);
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if (!find) {
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mp_raise_msg_varg(&mp_type_ValueError, MP_ERROR_TEXT("Pin(%q) does not have ADC capabilities"), pin_obj->name);
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}
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pin = pin_obj->pin;
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}
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ra_adc_init();
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machine_adc_obj_t *o = mp_obj_malloc(machine_adc_obj_t, &machine_adc_type);
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o->adc = (ADC_TypeDef *)NULL;
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o->channel = channel;
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o->pin = pin;
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o->sample_time = sample_time;
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ra_adc_enable((uint8_t)pin);
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return MP_OBJ_FROM_PTR(o);
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}
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static mp_int_t mp_machine_adc_read(machine_adc_obj_t *self) {
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return ra_adc_read((uint32_t)(self->pin));
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}
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static mp_int_t mp_machine_adc_read_u16(machine_adc_obj_t *self) {
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mp_uint_t raw = (mp_uint_t)ra_adc_read((uint32_t)(self->pin));
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mp_int_t bits = (mp_int_t)ra_adc_get_resolution();
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// Scale raw reading to 16 bit value using a Taylor expansion (for 8 <= bits <= 16)
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mp_uint_t u16 = raw << (16 - bits) | raw >> (2 * bits - 16);
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return u16;
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}
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