/* * 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 #include #include #include #include #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) { 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; } } }