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circuitpython/ports/cxd56/common-hal/analogio/AnalogIn.c

133 lines
4.2 KiB

/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright 2019 Sony Semiconductor Solutions Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <arch/chip/scu.h>
#include <arch/chip/adc.h>
#include "py/runtime.h"
#include "shared-bindings/analogio/AnalogIn.h"
typedef struct {
const char* devpath;
const mcu_pin_obj_t *pin;
int fd;
} analogin_dev_t;
STATIC analogin_dev_t analogin_dev[] = {
{"/dev/lpadc0", &pin_LPADC0, -1},
{"/dev/lpadc1", &pin_LPADC1, -1},
{"/dev/lpadc2", &pin_LPADC2, -1},
{"/dev/lpadc3", &pin_LPADC3, -1},
{"/dev/hpadc0", &pin_HPADC0, -1},
{"/dev/hpadc1", &pin_HPADC1, -1},
};
void common_hal_analogio_analogin_construct(analogio_analogin_obj_t *self, const mcu_pin_obj_t *pin) {
if (!pin->analog) {
mp_raise_ValueError(translate("AnalogIn not supported on given pin"));
}
self->number = -1;
for (int i = 0; i < MP_ARRAY_SIZE(analogin_dev); i++) {
if (pin->number == analogin_dev[i].pin->number) {
self->number = i;
break;
}
}
if (self->number < 0) {
mp_raise_ValueError(translate("Pin does not have ADC capabilities"));
}
if (analogin_dev[self->number].fd < 0) {
analogin_dev[self->number].fd = open(analogin_dev[self->number].devpath, O_RDONLY);
if (analogin_dev[self->number].fd < 0) {
mp_raise_ValueError(translate("Pin does not have ADC capabilities"));
}
}
// SCU FIFO overwrite
ioctl(analogin_dev[self->number].fd, SCUIOC_SETFIFOMODE, 1);
// ADC FIFO size
ioctl(analogin_dev[self->number].fd, ANIOC_CXD56_FIFOSIZE, 2);
// start ADC
ioctl(analogin_dev[self->number].fd, ANIOC_CXD56_START, 0);
self->pin = pin;
}
void common_hal_analogio_analogin_deinit(analogio_analogin_obj_t *self) {
if (common_hal_analogio_analogin_deinited(self)) {
return;
}
// stop ADC
ioctl(analogin_dev[self->number].fd, ANIOC_CXD56_STOP, 0);
close(analogin_dev[self->number].fd);
analogin_dev[self->number].fd = -1;
self->pin = NULL;
}
bool common_hal_analogio_analogin_deinited(analogio_analogin_obj_t *self) {
return analogin_dev[self->number].fd < 0;
}
uint16_t common_hal_analogio_analogin_get_value(analogio_analogin_obj_t *self) {
uint16_t value = 0;
read(analogin_dev[self->number].fd, &value, sizeof(value));
return value;
}
// Reference voltage is a fixed value which is depending on the board.
// e.g.)
// - Reference Voltage of A4 and A5 pins on Main Board is 0.7V.
// - Reference Voltage of A0 ~ A5 pins on External Interface board
// is selected 3.3V or 5.0V by a IO Volt jumper pin.
float common_hal_analogio_analogin_get_reference_voltage(analogio_analogin_obj_t *self) {
return 0.0f;
}
void analogin_reset(void) {
for (int i = 0; i < MP_ARRAY_SIZE(analogin_dev); i++) {
if (analogin_dev[i].fd >= 0) {
// stop ADC
ioctl(analogin_dev[i].fd, ANIOC_CXD56_STOP, 0);
close(analogin_dev[i].fd);
analogin_dev[i].fd = -1;
}
}
}