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circuitpython/shared-bindings/busio/I2C.h

72 lines
3.3 KiB

/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2016 Scott Shawcroft
*
* 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.
*/
// Machine is the HAL for low-level, hardware accelerated functions. It is not
// meant to simplify APIs, its only meant to unify them so that other modules
// do not require port specific logic.
//
// This file includes externs for all functions a port should implement to
// support the machine module.
#ifndef MICROPY_INCLUDED_SHARED_BINDINGS_BUSIO_I2C_H
#define MICROPY_INCLUDED_SHARED_BINDINGS_BUSIO_I2C_H
#include "py/obj.h"
#include "common-hal/microcontroller/Pin.h"
#include "common-hal/busio/I2C.h"
// Type object used in Python. Should be shared between ports.
extern const mp_obj_type_t busio_i2c_type;
// Initializes the hardware peripheral.
extern void common_hal_busio_i2c_construct(busio_i2c_obj_t *self,
const mcu_pin_obj_t * scl,
const mcu_pin_obj_t * sda,
uint32_t frequency,
uint32_t timeout);
extern void common_hal_busio_i2c_deinit(busio_i2c_obj_t *self);
extern bool common_hal_busio_i2c_deinited(busio_i2c_obj_t *self);
extern bool common_hal_busio_i2c_try_lock(busio_i2c_obj_t *self);
extern bool common_hal_busio_i2c_has_lock(busio_i2c_obj_t *self);
extern void common_hal_busio_i2c_unlock(busio_i2c_obj_t *self);
// Probe the bus to see if a device acknowledges the given address.
extern bool common_hal_busio_i2c_probe(busio_i2c_obj_t *self, uint8_t addr);
// Write to the device and return 0 on success or an appropriate error code from mperrno.h
extern uint8_t common_hal_busio_i2c_write(busio_i2c_obj_t *self, uint16_t address,
const uint8_t * data, size_t len,
bool stop);
// Reads memory of the i2c device picking up where it left off and return 0 on
// success or an appropriate error code from mperrno.h
extern uint8_t common_hal_busio_i2c_read(busio_i2c_obj_t *self, uint16_t address,
uint8_t * data, size_t len);
#endif // MICROPY_INCLUDED_SHARED_BINDINGS_BUSIO_I2C_H