142 lines
4.2 KiB
C
142 lines
4.2 KiB
C
/*
|
|
* 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"
|
|
#include "shared-bindings/microcontroller/Pin.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) {
|
|
raise_ValueError_invalid_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) {
|
|
raise_ValueError_invalid_pin();
|
|
}
|
|
|
|
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) {
|
|
raise_ValueError_invalid_pin();
|
|
}
|
|
}
|
|
|
|
// 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) {
|
|
int16_t value = 0;
|
|
|
|
read(analogin_dev[self->number].fd, &value, sizeof(value));
|
|
|
|
return (uint16_t)32768 + (uint16_t)value;
|
|
}
|
|
|
|
// Reference voltage is a fixed value which is depending on the board.
|
|
// e.g.)
|
|
// - Reference Voltage of A2 and A3 pins on Main Board is 0.7V.
|
|
// - Reference Voltage of A0 ~ A5 pins on External Interface board is 5.0V
|
|
float common_hal_analogio_analogin_get_reference_voltage(analogio_analogin_obj_t *self) {
|
|
float voltage;
|
|
|
|
if (self->number == 2 || self->number == 3) {
|
|
voltage = 0.0f;
|
|
} else {
|
|
voltage = 5.0f;
|
|
}
|
|
|
|
return voltage;
|
|
}
|
|
|
|
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;
|
|
}
|
|
}
|
|
}
|