102 lines
3.5 KiB
C
102 lines
3.5 KiB
C
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/*
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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) 2017 Scott Shawcroft for Adafruit Industries
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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/busdevice/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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void common_hal_busdevice_i2cdevice_construct(busdevice_i2cdevice_obj_t *self, busio_i2c_obj_t *i2c, uint8_t device_address, bool probe) {
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self->i2c = i2c;
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self->device_address = device_address;
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self->probe = probe;
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if (self->probe == true) {
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common_hal_busdevice_i2cdevice___probe_for_device(self);
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}
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}
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void common_hal_busdevice_i2cdevice_lock(busdevice_i2cdevice_obj_t *self) {
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bool success = false;
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while (!success) {
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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_busdevice_i2cdevice_unlock(busdevice_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_busdevice_i2cdevice_readinto(busdevice_i2cdevice_obj_t *self, mp_obj_t buffer, size_t length) {
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uint8_t status = common_hal_busio_i2c_read(self->i2c, self->device_address, buffer, length);
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return status;
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}
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uint8_t common_hal_busdevice_i2cdevice_write(busdevice_i2cdevice_obj_t *self, mp_obj_t buffer, size_t length) {
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uint8_t status = common_hal_busio_i2c_write(self->i2c, self->device_address, buffer, length, true);
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return status;
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}
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uint8_t common_hal_busdevice_i2cdevice_write_then_readinto(busdevice_i2cdevice_obj_t *self, mp_obj_t out_buffer, mp_obj_t in_buffer,
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size_t out_length, size_t in_length) {
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uint8_t status = 0;
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status = common_hal_busio_i2c_write(self->i2c, self->device_address, out_buffer, out_length, true);
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status = common_hal_busio_i2c_read(self->i2c, self->device_address, in_buffer, in_length);
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return status;
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}
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uint8_t common_hal_busdevice_i2cdevice___probe_for_device(busdevice_i2cdevice_obj_t *self) {
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// write ""
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/*
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while not self.i2c.try_lock():
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pass
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try:
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self.i2c.writeto(self.device_address, b"")
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except OSError:
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# some OS's dont like writing an empty bytesting...
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# Retry by reading a byte
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try:
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result = bytearray(1)
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self.i2c.readfrom_into(self.device_address, result)
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except OSError:
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raise ValueError("No I2C device at address: %x" % self.device_address)
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finally:
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self.i2c.unlock()
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*/
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return 0;
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}
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