2015-08-05 13:36:14 -03:00
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/*
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* Copyright (C) 2015 Intel Corporation. All rights reserved.
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*
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* This file is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This file is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <inttypes.h>
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class AuxiliaryBus;
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class AP_InertialSensor_Backend;
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namespace AP_HAL {
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class Semaphore;
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}
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class AuxiliaryBusSlave
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{
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friend class AuxiliaryBus;
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public:
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virtual ~AuxiliaryBusSlave();
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/*
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* Read a block of registers from the slave. This is a one-time read. Must
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* be implemented by the sensor exposing the AuxiliaryBus.
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*
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* This method cannot be called after the periodic read is configured
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* since the registers for the periodic read may be shared with the
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* passthrough reads.
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*
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* @reg: the first register of the block to use in this one time transfer
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* @buf: buffer in which to write the values read
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* @size: the buffer size
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*
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* Return the number of bytes read on success or < 0 on error
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*/
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virtual int passthrough_read(uint8_t reg, uint8_t *buf, uint8_t size) = 0;
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/*
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* Write a single value into a register of this slave. Must be implemented
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* by the sensor exposing the AuxiliaryBus.
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*
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* This method cannot be called after the periodic read is configured
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* since the registers for the periodic read may be shared with the
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* passthrough writes.
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*
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* @reg: the register to use in this one time transfer
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* @val: the value to write
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*
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* Return the number of bytes written on success or < 0 on error
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*/
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virtual int passthrough_write(uint8_t reg, uint8_t val) = 0;
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/*
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* Read the block of registers that were read from the slave on the last
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* time a periodic read occurred.
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*
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* This method must be called after the periodic read is configured and
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2016-05-12 13:55:53 -03:00
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* the buffer must be large enough to accommodate the size configured.
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2015-08-05 13:36:14 -03:00
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*
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* @buf: buffer in which to write the values read
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*
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* Return the number of bytes read on success or < 0 on error
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*/
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virtual int read(uint8_t *buf) = 0;
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protected:
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/* Only AuxiliaryBus is able to create a slave */
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AuxiliaryBusSlave(AuxiliaryBus &bus, uint8_t addr, uint8_t instance);
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AuxiliaryBus &_bus;
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uint8_t _addr = 0;
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uint8_t _instance = 0;
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uint8_t _sample_reg_start = 0;
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uint8_t _sample_size = 0;
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bool _registered = false;
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};
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class AuxiliaryBus
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{
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friend class AP_InertialSensor_Backend;
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public:
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AP_InertialSensor_Backend &get_backend() { return _ins_backend; }
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AuxiliaryBusSlave *request_next_slave(uint8_t addr);
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int register_periodic_read(AuxiliaryBusSlave *slave, uint8_t reg, uint8_t size);
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/*
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* Get the semaphore needed to call methods on the bus this sensor is on.
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* Internally no locks are taken and it's the caller's duty to lock and
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* unlock the bus as needed.
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*
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* This method must be implemented by the sensor exposing the
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* AuxiliaryBus.
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*
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* Return the semaphore used protect transfers on the bus
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*/
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virtual AP_HAL::Semaphore *get_semaphore() = 0;
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protected:
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/* Only AP_InertialSensor_Backend is able to create a bus */
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AuxiliaryBus(AP_InertialSensor_Backend &backend, uint8_t max_slaves);
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virtual ~AuxiliaryBus();
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virtual AuxiliaryBusSlave *_instantiate_slave(uint8_t addr, uint8_t instance) = 0;
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virtual int _configure_periodic_read(AuxiliaryBusSlave *slave, uint8_t reg,
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uint8_t size) = 0;
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uint8_t _n_slaves = 0;
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const uint8_t _max_slaves;
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AuxiliaryBusSlave **_slaves;
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AP_InertialSensor_Backend &_ins_backend;
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};
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