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DS2482.h
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DS2482.h
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// DS2482.h - header for I2C-to-onewire bridge IC
//
// Started: Jan 21, 2022 G. D. (Joe) Young <[email protected]>
//
// Revised: Feb 1/22 - make calc_crc8 public
// Feb 15/22 - subroutines for I2C i/o
//
//
// A library of functions from Dallas/Maxim Application Note AN3684, altered to
// conform to an arduino library format and to use the arduino Wire library
// for I2C I/O between arduino and the bridge IC. The bridge IC handles the
// timing for the one-wire transactions.
//
#ifndef DS2482_HDR
#define DS2482_HDR
#include <stdint.h>
#include <Wire.h>
//DS2482 register addresses
#define DATAREG 0xE1
#define STATREG 0xF0
#define CNFGREG 0xC3
//DS2482 command definitions
#define CMD_DRST 0xF0 //device reset
#define CMD_WCFG 0xD2 //write configuration
#define CMD_1WRS 0xB4 //one-wire reset
#define CMD_1WSB 0x87 //one-wire single bit
#define CMD_1WWB 0xA5 //one-wire write byte
#define CMD_1WRB 0x96 //one-wire read byte
#define CMD_WWBP 0x44 //one-wire write byte power
#define CMD_SRP 0xE1 //set read pointer
#define CMD_1WT 0x78 //one-wire triplet
#define POLL_LIMIT 10 //number of times to check status of reset
//DS2482 status register bit number names
#define ST_1WB 0 //1WB one-wire busy
#define ST_PPD 1 //presence pulse detect
#define ST_SD 2 //Short Detected
#define ST_LL 3 //logic level
#define ST_RST 4 //device reset
#define ST_SBR 5 //single bit result
#define ST_TSB 6 //triplet second bit
#define ST_DIR 7 //branch direction taken
//cofiguration settings - register bit number names
#define CONFIG_APU 1 //active pullup enabled
#define APU 0 //active pull-up enabled when 1
#define SPU 2 //strong pull-up enabled when 1
#define wWS 3 //1WS in data sheet; 1-wire speed fast when 1
#define MODE_STANDARD 0x01 //APU bit ON
#define MODE_STRONG 0x04 //SPU bit ON
//#define DEBUG
#include <Arduino.h>
class DS2482 {
public:
DS2482( uint8_t _i2cAdr ); //constructor receives DS2482 I2C address
void begin( );
bool DS2482_reset();
bool DS2482_detect( );
bool DS2482_write_config(uint8_t config);
bool OWReset( );
uint8_t OWTouchBit(uint8_t sendbit);
uint8_t OWTouchByte(uint8_t sendbyte);
bool OWSearch();
bool OWFirst( );
bool OWNext();
void OWWriteBit(uint8_t sendbit);
uint8_t OWReadBit(void);
void OWWriteByte(uint8_t sendbyte);
uint8_t OWReadByte(void);
void OWBlock(uint8_t *tran_buf, int tran_len);
uint8_t DS2482_search_triplet(int search_direction);
int OWWriteBytePower(int sendbyte);
int OWReadBitPower(int applyPowerResponse);
uint8_t OWLevel(uint8_t new_level);
bool short_detected;
uint8_t ROM_NO[8];
uint8_t calc_crc8( uint8_t &rombyte );
private:
int I2Cadr;
uint8_t c1WS,cSPU,cPPM,cAPU;
// Search state
int LastDiscrepancy;
int LastFamilyDiscrepancy;
bool LastDeviceFlag;
uint8_t crc8;
// I2C i/o collection
uint8_t owcmd( uint8_t cmd );
uint8_t owcmd( uint8_t cmd, uint8_t dat );
uint8_t owcmdw( uint8_t cmd );
uint8_t owcmdw( uint8_t cmd, uint8_t dat );
uint8_t owwait( uint8_t status );
const uint8_t dscrc_table[256] = { /* crc table */
0, 94,188,226, 97, 63,221,131,194,156,126, 32,163,253, 31, 65,
157,195, 33,127,252,162, 64, 30, 95, 1,227,189, 62, 96,130,220,
35,125,159,193, 66, 28,254,160,225,191, 93, 3,128,222, 60, 98,
190,224, 2, 92,223,129, 99, 61,124, 34,192,158, 29, 67,161,255,
70, 24,250,164, 39,121,155,197,132,218, 56,102,229,187, 89, 7,
219,133,103, 57,186,228, 6, 88, 25, 71,165,251,120, 38,196,154,
101, 59,217,135, 4, 90,184,230,167,249, 27, 69,198,152,122, 36,
248,166, 68, 26,153,199, 37,123, 58,100,134,216, 91, 5,231,185,
140,210, 48,110,237,179, 81, 15, 78, 16,242,172, 47,113,147,205,
17, 79,173,243,112, 46,204,146,211,141,111, 49,178,236, 14, 80,
175,241, 19, 77,206,144,114, 44,109, 51,209,143, 12, 82,176,238,
50,108,142,208, 83, 13,239,177,240,174, 76, 18,145,207, 45,115,
202,148,118, 40,171,245, 23, 73, 8, 86,180,234,105, 55,213,139,
87, 9,235,181, 54,104,138,212,149,203, 41,119,244,170, 72, 22,
233,183, 85, 11,136,214, 52,106, 43,117,151,201, 74, 20,246,168,
116, 42,200,150, 21, 75,169,247,182,232, 10, 84,215,137,107, 53
};
}; //class DS2482
#endif