/**************************************************************************** * drivers/1wire/1wire_internal.h * * Copyright (C) 2018 Haltian Ltd. All rights reserved. * Author: Juha Niskanen * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name NuttX nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************/ #ifndef __DRIVERS_1WIRE_1WIRE_INTERNAL_H #define __DRIVERS_1WIRE_1WIRE_INTERNAL_H /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include /**************************************************************************** * Public Types ****************************************************************************/ struct onewire_dev_s; struct onewire_sem_s { sem_t sem; pid_t holder; /* The current holder of the semaphore */ int16_t count; /* Number of counts held */ }; struct onewire_master_s { FAR struct onewire_dev_s *dev; /* 1-Wire lower half */ struct onewire_sem_s devsem; /* Re-entrant semaphore */ int nslaves; /* Number of 1-wire slaves */ int maxslaves; /* Maximum number of 1-wire slaves */ bool insearch; /* If we are in middle of 1-wire search */ }; struct onewire_slave_s { FAR struct onewire_master_s *master; /* Slave's bus master */ uint64_t romcode; /* Unique ROM id in bus */ }; /**************************************************************************** * Public Function Prototypes ****************************************************************************/ /* CRC helpers from 1wire_crc.c */ uint8_t onewire_crc8(FAR const uint8_t *input, uint8_t len); uint16_t onewire_crc16(FAR const uint8_t *input, uint16_t len, uint16_t initial_crc); bool onewire_valid_rom(uint64_t rom); bool onewire_check_crc16(FAR const uint8_t *input, uint16_t len, FAR const uint8_t *inverted_crc); /* Rest are from 1wire.c */ void onewire_sem_wait(FAR struct onewire_master_s *master); void onewire_sem_post(FAR struct onewire_master_s *master); int onewire_addslave(FAR struct onewire_master_s *master, FAR struct onewire_slave_s *slave); int onewire_removeslave(FAR struct onewire_master_s *master, FAR struct onewire_slave_s *slave); /**************************************************************************** * Name: onewire_reset_resume * * Description: * ****************************************************************************/ int onewire_reset_resume(FAR struct onewire_master_s *master); /**************************************************************************** * Name: onewire_reset_select * * Description: * ****************************************************************************/ int onewire_reset_select(FAR struct onewire_slave_s *slave); /**************************************************************************** * Name: onewire_triplet * * Description: * Used by 1-wire search algorithm. Reads two bits and writes * one based on comparison of read bits. * * Input Parameters: * search_bit - Bit to write if both id_bit and cmp_id_bit match * * Output Parameters: * taken_bit - Bit indicating the direction where the search is * progressing. * * Return Value: * Number of valid bits or negative on error. * ****************************************************************************/ int onewire_triplet(FAR struct onewire_master_s *master, uint8_t search_bit, FAR uint8_t *taken_bit); /**************************************************************************** * Name: onewire_search * * Description: * Search all devices from a 1-wire network. This is the 1-wire search * algorithm from Maxim Application Note 187. * * Input Parameters: * master - Pointer to the allocated 1-wire interface * family - Limit search to devices of matching family * alarmonly - Limit search to devices on alarm state * cb_search - Callback to call on each device found * arg - Argument passed to cb_search * * Return Value: * Number of slaves present and matching family. * ****************************************************************************/ int onewire_search(FAR struct onewire_master_s *master, int family, bool alarmonly, CODE void (*cb_search)(int family, uint64_t romcode, FAR void *arg), FAR void *arg); /**************************************************************************** * Name: onewire_initialize * * Description: * Return 1-wire bus master from 1-wire lower half device. * * Input Parameters: * dev - Pointer to the allocated 1-wire lower half * maxslaves - Maximum number of 1-wire slave devices * ****************************************************************************/ FAR struct onewire_master_s * onewire_initialize(FAR struct onewire_dev_s *dev, int maxslaves); #endif /* __DRIVERS_1WIRE_1WIRE_INTERNAL_H */