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83 lines
2.2 KiB
83 lines
2.2 KiB
//
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// Created by MightyPork on 2018/02/01.
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//
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#ifndef GEX_F072_OW_SEARCH_H
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#define GEX_F072_OW_SEARCH_H
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#ifndef OW_INTERNAL
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#error bad include!
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#endif
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#include <stdint.h>
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#include <stdbool.h>
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#include "unit_base.h"
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// --------------------------------------------------------------------------------------
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/**
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* Data type holding a romcode
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*/
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typedef uint8_t ow_romcode_t[8];
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/**
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* Get a single bit from a romcode
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*/
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#define ow_code_getbit(code, index) (bool)((code)[(index) >> 3] & (1 << ((index) & 7)))
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/**
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* Convert to unsigned 64-bit integer
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* (works only on little-endian systems - eg. OK on x86/x86_64, not on PowerPC)
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*/
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#define ow_romcode_to_u64(code) (*((uint64_t *) (void *)(code)))
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/**
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* States of the search algorithm
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*/
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enum ow_search_result {
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OW_SEARCH_DONE = 0,
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OW_SEARCH_MORE = 1,
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OW_SEARCH_FAILED = 2,
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};
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/**
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* Internal state of the search algorithm.
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* Check status to see if more remain to be read or an error occurred.
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*/
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struct ow_search_state {
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int8_t prev_last_fork;
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ow_romcode_t prev_code;
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uint8_t command;
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enum ow_search_result status;
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bool first;
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bool test_checksums;
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error_t error;
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};
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/**
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* Init the search algorithm state structure
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*
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* @param[out] state - inited struct
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* @param[in] command - command to send for requesting the search (e.g. SEARCH_ROM)
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* @param[in] test_checksums - verify checksums of all read romcodes
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*/
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void ow_search_init(Unit *unit, uint8_t command, bool test_checksums);
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/**
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* Perform a search of the 1-wire bus, with a state struct pre-inited
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* using ow_search_init().
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*
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* Romcodes are stored in the provided array in a numerically ascending order.
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*
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* This function may be called repeatedly to retrieve more addresses than could fit
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* in the address buffer.
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*
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* @param[in,out] state - search state, used for multiple calls with limited buffer size
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* @param[out] codes - buffer for found romcodes
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* @param[in] capacity - buffer capacity
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* @return number of romcodes found. Search status is stored in `state->status`,
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* possible error code in `status->error`
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*/
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uint32_t ow_search_run(Unit *unit, ow_romcode_t *codes, uint32_t capacity);
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#endif //GEX_F072_OW_SEARCH_H
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