80 lines
3.2 KiB
C
80 lines
3.2 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 (c) 2020 Mark Komus
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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 "shared-bindings/adafruit_bus_device/I2CDevice.h"
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#include "shared-bindings/busio/I2C.h"
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#include "py/mperrno.h"
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#include "py/nlr.h"
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#include "py/runtime.h"
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#include "lib/utils/interrupt_char.h"
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void common_hal_adafruit_bus_device_i2cdevice_construct(adafruit_bus_device_i2cdevice_obj_t *self, busio_i2c_obj_t *i2c, uint8_t device_address) {
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self->i2c = i2c;
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self->device_address = device_address;
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}
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void common_hal_adafruit_bus_device_i2cdevice_lock(adafruit_bus_device_i2cdevice_obj_t *self) {
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bool success = common_hal_busio_i2c_try_lock(self->i2c);
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while (!success) {
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RUN_BACKGROUND_TASKS;
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if (mp_hal_is_interrupted()) {
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break;
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}
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success = common_hal_busio_i2c_try_lock(self->i2c);
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}
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}
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void common_hal_adafruit_bus_device_i2cdevice_unlock(adafruit_bus_device_i2cdevice_obj_t *self) {
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common_hal_busio_i2c_unlock(self->i2c);
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}
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uint8_t common_hal_adafruit_bus_device_i2cdevice_readinto(adafruit_bus_device_i2cdevice_obj_t *self, mp_obj_t buffer, size_t length) {
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return common_hal_busio_i2c_read(self->i2c, self->device_address, buffer, length);
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}
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uint8_t common_hal_adafruit_bus_device_i2cdevice_write(adafruit_bus_device_i2cdevice_obj_t *self, mp_obj_t buffer, size_t length, bool transmit_stop_bit) {
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return common_hal_busio_i2c_write(self->i2c, self->device_address, buffer, length, transmit_stop_bit);
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}
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void common_hal_adafruit_bus_device_i2cdevice_probe_for_device(adafruit_bus_device_i2cdevice_obj_t *self) {
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common_hal_adafruit_bus_device_i2cdevice_lock(self);
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mp_buffer_info_t bufinfo;
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mp_obj_t buffer = mp_obj_new_bytearray_of_zeros(1);
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mp_get_buffer_raise(buffer, &bufinfo, MP_BUFFER_WRITE);
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uint8_t status = common_hal_adafruit_bus_device_i2cdevice_readinto(self, (uint8_t*)bufinfo.buf, 1);
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if (status != 0) {
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common_hal_adafruit_bus_device_i2cdevice_unlock(self);
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mp_raise_ValueError_varg(translate("No I2C device at address: %x"), self->device_address);
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}
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common_hal_adafruit_bus_device_i2cdevice_unlock(self);
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}
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