kopia lustrzana https://github.com/micropython/micropython
146 wiersze
5.0 KiB
C
146 wiersze
5.0 KiB
C
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/*
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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) 2021 Philipp Ebensberger
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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 <stdint.h>
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#include "py/obj.h"
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#include "py/runtime.h"
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#include "py/mphal.h"
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#include "fsl_adc.h"
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#include "fsl_gpio.h"
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#include "fsl_iomuxc.h"
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#include "modmachine.h"
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typedef struct _machine_adc_obj_t {
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mp_obj_base_t base;
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ADC_Type *adc;
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uint8_t channel;
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uint8_t channel_group;
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uint16_t resolution;
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} machine_adc_obj_t;
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STATIC ADC_Type *const adc_bases[] = ADC_BASE_PTRS;
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STATIC void adc_obj_print(const mp_print_t *print, mp_obj_t o, mp_print_kind_t kind) {
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(void)kind;
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machine_adc_obj_t *self = MP_OBJ_TO_PTR(o);
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// Get ADC adc id
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for (int i = 1; i < sizeof(adc_bases) / sizeof(ADC_Type *); ++i) {
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if (adc_bases[i] == self->adc) {
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mp_printf(print, "ADC(%u, channel=%u)", i, self->channel);
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break;
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}
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}
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}
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STATIC mp_obj_t adc_obj_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
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mp_arg_check_num(n_args, n_kw, 1, 1, false);
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// Unpack and check parameter
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const machine_pin_obj_t *pin = pin_find(args[0]);
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if (pin->adc_list_len == 0) {
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mp_raise_msg_varg(&mp_type_ValueError, MP_ERROR_TEXT("Pin(%q) does not have ADC capabilities"), pin->name);
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}
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// Extract arguments
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ADC_Type *adc_instance = pin->adc_list[0].instance; // NOTE: we only use the first ADC assignment - multiple assignments are not supported for now
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uint8_t channel = pin->adc_list[0].channel;
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// Configure ADC peripheral channel
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adc_channel_config_t channel_config = {
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.channelNumber = (uint32_t)channel,
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.enableInterruptOnConversionCompleted = false,
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};
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ADC_SetChannelConfig(adc_instance, 0UL, &channel_config); // NOTE: we always choose channel group '0' since we only perform software triggered conversion
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// Create ADC Instance
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machine_adc_obj_t *o = m_new_obj(machine_adc_obj_t);
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o->base.type = &machine_adc_type;
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o->adc = adc_instance;
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o->channel = (uint8_t)channel;
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o->channel_group = 0;
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o->resolution = 4096; // NOTE: currently only 12bit resolution supported
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return MP_OBJ_FROM_PTR(o);
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}
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// read_u16()
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STATIC mp_obj_t machine_adc_read_u16(mp_obj_t self_in) {
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machine_adc_obj_t *self = MP_OBJ_TO_PTR(self_in);
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// Initiate conversion
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adc_channel_config_t channel_config = {
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.channelNumber = self->channel,
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.enableInterruptOnConversionCompleted = false,
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};
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ADC_SetChannelConfig(self->adc, (uint32_t)self->channel_group, &channel_config);
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// Wait for conversion to finish
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while (!ADC_GetChannelStatusFlags(self->adc, (uint32_t)self->channel_group)) {
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// do nothing
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}
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// Measure input voltage
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uint32_t value = ADC_GetChannelConversionValue(self->adc, (uint32_t)self->channel_group);
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return MP_OBJ_NEW_SMALL_INT(value * 65535 / self->resolution);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(machine_adc_read_u16_obj, machine_adc_read_u16);
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STATIC const mp_rom_map_elem_t adc_locals_dict_table[] = {
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{ MP_ROM_QSTR(MP_QSTR_read_u16), MP_ROM_PTR(&machine_adc_read_u16_obj) },
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};
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STATIC MP_DEFINE_CONST_DICT(adc_locals_dict, adc_locals_dict_table);
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const mp_obj_type_t machine_adc_type = {
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{&mp_type_type},
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.name = MP_QSTR_ADC,
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.print = adc_obj_print,
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.make_new = adc_obj_make_new,
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.locals_dict = (mp_obj_dict_t *)&adc_locals_dict,
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};
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void machine_adc_init(void) {
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for (int i = 1; i < sizeof(adc_bases) / sizeof(ADC_Type *); ++i) {
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ADC_Type *adc_instance = adc_bases[i];
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// Configure ADC perpheral
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adc_config_t config;
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ADC_GetDefaultConfig(&config);
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ADC_Init(adc_instance, &config);
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// Perform calibration
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status_t calib_state = ADC_DoAutoCalibration(adc_instance);
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if (calib_state == kStatus_Fail) {
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mp_printf(&mp_plat_print, "Calibration for ADC Instance %d failed", i);
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}
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}
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}
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