91 lines
3.4 KiB
C
91 lines
3.4 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, mp_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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mp_obj_t dest[2];
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mp_load_method(self->i2c, MP_QSTR_try_lock, dest);
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mp_obj_t success = mp_call_method_n_kw(0, 0, dest);
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while (!mp_obj_is_true(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 = mp_call_method_n_kw(0, 0, dest);
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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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mp_obj_t dest[2];
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mp_load_method(self->i2c, MP_QSTR_unlock, dest);
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mp_call_method_n_kw(0, 0, dest);
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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 write_bufinfo;
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mp_obj_t write_buffer = mp_obj_new_bytearray_of_zeros(0);
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mp_get_buffer_raise(write_buffer, &write_bufinfo, MP_BUFFER_READ);
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mp_obj_t dest[4];
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/* catch exceptions that may be thrown while probing for the device */
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nlr_buf_t nlr;
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if (nlr_push(&nlr) == 0) {
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mp_load_method(self->i2c, MP_QSTR_writeto, dest);
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dest[2] = MP_OBJ_NEW_SMALL_INT(self->device_address);
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dest[3] = write_buffer;
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mp_call_method_n_kw(2, 0, dest);
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nlr_pop();
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} else {
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common_hal_adafruit_bus_device_i2cdevice_unlock(self);
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if (mp_obj_is_subclass_fast(MP_OBJ_FROM_PTR(((mp_obj_base_t *)nlr.ret_val)->type), MP_OBJ_FROM_PTR(&mp_type_OSError))) {
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mp_raise_ValueError_varg(translate("No I2C device at address: %x"), self->device_address);
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} else {
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/* In case we receive an unrelated exception pass it up */
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nlr_raise(MP_OBJ_FROM_PTR(nlr.ret_val));
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}
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}
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common_hal_adafruit_bus_device_i2cdevice_unlock(self);
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}
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