circuitpython/shared-module/busdevice/I2CDevice.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
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* Copyright (c) 2020 Mark Komus
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*
* 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 "shared-bindings/busdevice/I2CDevice.h"
#include "shared-bindings/busio/I2C.h"
#include "py/mperrno.h"
#include "py/nlr.h"
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#include "py/runtime.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) {
self->i2c = i2c;
self->device_address = device_address;
self->probe = probe;
}
void common_hal_busdevice_i2cdevice_lock(busdevice_i2cdevice_obj_t *self) {
bool success = false;
while (!success) {
success = common_hal_busio_i2c_try_lock(self->i2c);
}
}
void common_hal_busdevice_i2cdevice_unlock(busdevice_i2cdevice_obj_t *self) {
common_hal_busio_i2c_unlock(self->i2c);
}
uint8_t common_hal_busdevice_i2cdevice_readinto(busdevice_i2cdevice_obj_t *self, mp_obj_t buffer, size_t length) {
uint8_t status = common_hal_busio_i2c_read(self->i2c, self->device_address, buffer, length);
return status;
}
uint8_t common_hal_busdevice_i2cdevice_write(busdevice_i2cdevice_obj_t *self, mp_obj_t buffer, size_t length) {
uint8_t status = common_hal_busio_i2c_write(self->i2c, self->device_address, buffer, length, true);
return status;
}
uint8_t common_hal_busdevice_i2cdevice_write_then_readinto(busdevice_i2cdevice_obj_t *self, mp_obj_t out_buffer, mp_obj_t in_buffer,
size_t out_length, size_t in_length) {
uint8_t status = 0;
status = common_hal_busio_i2c_write(self->i2c, self->device_address, out_buffer, out_length, true);
status = common_hal_busio_i2c_read(self->i2c, self->device_address, in_buffer, in_length);
return status;
}
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void common_hal_busdevice_i2cdevice___probe_for_device(busdevice_i2cdevice_obj_t *self) {
common_hal_busdevice_i2cdevice_lock(self);
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mp_buffer_info_t bufinfo;
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_busdevice_i2cdevice_readinto(self, (uint8_t*)bufinfo.buf, 1);
if (status != 0) {
common_hal_busdevice_i2cdevice_unlock(self);
mp_raise_ValueError_varg(translate("No I2C device at address: %x"), self->device_address);
}
common_hal_busdevice_i2cdevice_unlock(self);
}