141 lines
4.3 KiB
C
141 lines
4.3 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 2019 Sony Semiconductor Solutions 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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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <arch/chip/scu.h>
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#include <arch/chip/adc.h>
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#include "py/runtime.h"
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#include "shared-bindings/analogio/AnalogIn.h"
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typedef struct {
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const char *devpath;
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const mcu_pin_obj_t *pin;
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int fd;
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} analogin_dev_t;
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STATIC analogin_dev_t analogin_dev[] = {
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{"/dev/lpadc0", &pin_LPADC0, -1},
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{"/dev/lpadc1", &pin_LPADC1, -1},
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{"/dev/lpadc2", &pin_LPADC2, -1},
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{"/dev/lpadc3", &pin_LPADC3, -1},
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{"/dev/hpadc0", &pin_HPADC0, -1},
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{"/dev/hpadc1", &pin_HPADC1, -1},
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};
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void common_hal_analogio_analogin_construct(analogio_analogin_obj_t *self, const mcu_pin_obj_t *pin) {
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if (!pin->analog) {
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mp_raise_ValueError(translate("AnalogIn not supported on given pin"));
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}
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self->number = -1;
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for (int i = 0; i < MP_ARRAY_SIZE(analogin_dev); i++) {
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if (pin->number == analogin_dev[i].pin->number) {
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self->number = i;
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break;
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}
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}
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if (self->number < 0) {
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mp_raise_ValueError(translate("Pin does not have ADC capabilities"));
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}
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if (analogin_dev[self->number].fd < 0) {
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analogin_dev[self->number].fd = open(analogin_dev[self->number].devpath, O_RDONLY);
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if (analogin_dev[self->number].fd < 0) {
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mp_raise_ValueError(translate("Pin does not have ADC capabilities"));
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}
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}
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// SCU FIFO overwrite
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ioctl(analogin_dev[self->number].fd, SCUIOC_SETFIFOMODE, 1);
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// ADC FIFO size
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ioctl(analogin_dev[self->number].fd, ANIOC_CXD56_FIFOSIZE, 2);
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// start ADC
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ioctl(analogin_dev[self->number].fd, ANIOC_CXD56_START, 0);
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self->pin = pin;
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}
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void common_hal_analogio_analogin_deinit(analogio_analogin_obj_t *self) {
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if (common_hal_analogio_analogin_deinited(self)) {
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return;
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}
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// stop ADC
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ioctl(analogin_dev[self->number].fd, ANIOC_CXD56_STOP, 0);
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close(analogin_dev[self->number].fd);
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analogin_dev[self->number].fd = -1;
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self->pin = NULL;
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}
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bool common_hal_analogio_analogin_deinited(analogio_analogin_obj_t *self) {
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return analogin_dev[self->number].fd < 0;
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}
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uint16_t common_hal_analogio_analogin_get_value(analogio_analogin_obj_t *self) {
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int16_t value = 0;
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read(analogin_dev[self->number].fd, &value, sizeof(value));
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return (uint16_t)32768 + (uint16_t)value;
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}
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// Reference voltage is a fixed value which is depending on the board.
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// e.g.)
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// - Reference Voltage of A2 and A3 pins on Main Board is 0.7V.
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// - Reference Voltage of A0 ~ A5 pins on External Interface board is 5.0V
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float common_hal_analogio_analogin_get_reference_voltage(analogio_analogin_obj_t *self) {
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float voltage;
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if (self->number == 2 || self->number == 3) {
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voltage = 0.0f;
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} else {
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voltage = 5.0f;
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}
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return voltage;
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}
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void analogin_reset(void) {
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for (int i = 0; i < MP_ARRAY_SIZE(analogin_dev); i++) {
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if (analogin_dev[i].fd >= 0) {
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// stop ADC
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ioctl(analogin_dev[i].fd, ANIOC_CXD56_STOP, 0);
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close(analogin_dev[i].fd);
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analogin_dev[i].fd = -1;
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}
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}
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}
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