You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
84 lines
2.2 KiB
84 lines
2.2 KiB
6 years ago
|
//
|
||
|
|
// Created by MightyPork on 2018/02/01.
|
||
|
|
//
|
||
|
|
|
||
|
|
#ifndef GEX_F072_OW_SEARCH_H
|
||
|
|
#define GEX_F072_OW_SEARCH_H
|
||
|
|
|
||
|
|
#ifndef OW_INTERNAL
|
||
|
|
#error bad include!
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#include <stdint.h>
|
||
|
|
#include <stdbool.h>
|
||
|
|
#include "unit_base.h"
|
||
|
|
|
||
|
|
// --------------------------------------------------------------------------------------
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Data type holding a romcode
|
||
|
|
*/
|
||
|
|
typedef uint8_t ow_romcode_t[8];
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Get a single bit from a romcode
|
||
|
|
*/
|
||
|
|
#define ow_code_getbit(code, index) (bool)((code)[(index) >> 3] & (1 << ((index) & 7)))
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Convert to unsigned 64-bit integer
|
||
|
|
* (works only on little-endian systems - eg. OK on x86/x86_64, not on PowerPC)
|
||
|
|
*/
|
||
|
|
#define ow_romcode_to_u64(code) (*((uint64_t *) (void *)(code)))
|
||
|
|
|
||
|
|
/**
|
||
|
|
* States of the search algorithm
|
||
|
|
*/
|
||
|
|
enum ow_search_result {
|
||
|
|
OW_SEARCH_DONE = 0,
|
||
|
|
OW_SEARCH_MORE = 1,
|
||
|
|
OW_SEARCH_FAILED = 2,
|
||
|
|
};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Internal state of the search algorithm.
|
||
|
|
* Check status to see if more remain to be read or an error occurred.
|
||
|
|
*/
|
||
|
|
struct ow_search_state {
|
||
|
|
int8_t prev_last_fork;
|
||
|
|
ow_romcode_t prev_code;
|
||
|
|
uint8_t command;
|
||
|
|
enum ow_search_result status;
|
||
|
|
bool first;
|
||
|
|
bool test_checksums;
|
||
|
|
error_t error;
|
||
|
|
};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Init the search algorithm state structure
|
||
|
|
*
|
||
|
|
* @param[out] state - inited struct
|
||
|
|
* @param[in] command - command to send for requesting the search (e.g. SEARCH_ROM)
|
||
|
|
* @param[in] test_checksums - verify checksums of all read romcodes
|
||
|
|
*/
|
||
|
|
void ow_search_init(Unit *unit, uint8_t command, bool test_checksums);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Perform a search of the 1-wire bus, with a state struct pre-inited
|
||
|
|
* using ow_search_init().
|
||
|
|
*
|
||
|
|
* Romcodes are stored in the provided array in a numerically ascending order.
|
||
|
|
*
|
||
|
|
* This function may be called repeatedly to retrieve more addresses than could fit
|
||
|
|
* in the address buffer.
|
||
|
|
*
|
||
|
|
* @param[in,out] state - search state, used for multiple calls with limited buffer size
|
||
|
|
* @param[out] codes - buffer for found romcodes
|
||
|
|
* @param[in] capacity - buffer capacity
|
||
|
|
* @return number of romcodes found. Search status is stored in `state->status`,
|
||
|
|
* possible error code in `status->error`
|
||
|
|
*/
|
||
|
|
uint32_t ow_search_run(Unit *unit, ow_romcode_t *codes, uint32_t capacity);
|
||
|
|
|
||
|
|
#endif //GEX_F072_OW_SEARCH_H
|