1-Wire tester, shows ROM code and temperature on an LCD screen
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1wire-tester/onewire.h

59 lines
1.4 KiB

#pragma once
//
// Utils for Dallas OneWire bus (DS1820 etc)
//
#include <stdint.h>
#include <stdbool.h>
#define SKIP_ROM 0xCC
#define CONVERT_T 0x44
#define READ_SCRATCHPAD 0xBE
/** Perform bus reset. Returns true if any device is connected */
bool ow_reset(uint8_t pin);
/** Send a single byte */
void ow_write(const uint8_t pin, const uint8_t byte);
/** Read a single byte */
uint8_t ow_read(uint8_t pin);
/** Wait until the device is ready. Returns false on timeout */
bool ow_wait_ready(uint8_t pin);
/** Read bytes into an array */
void ow_read_arr(uint8_t pin, uint8_t* array, uint8_t count);
/** Compute a CRC16 checksum */
uint16_t crc16(uint8_t *data, uint8_t len);
/** Compute a CRC8 checksum */
uint8_t crc8(uint8_t *addr, uint8_t len);
// --- utils for DS1820 ---
#define TEMP_ERROR (-32768)
/**
* Read temperature in 0.0625°C, or TEMP_ERROR on error
* Use this where you'd normally use READ_SCRATCHPAD
*/
int16_t ds18s20_read_temp(uint8_t pin);
/**
* Read temperature in 0.1°C, or TEMP_ERROR on error
* Use this where you'd normally use READ_SCRATCHPAD
*/
int16_t ds18s20_read_temp_c(uint8_t pin);
int16_t ds18b20_read_temp_c(uint8_t pin);
/**
* Perform a temperature measurement with single DS1820 device on the line
* Can be followed by a call to read temperature (READ_SCRATCHPAD).
*
* Returns false on failure (device not connected)
*/
bool ds18x20_single_measure(uint8_t pin);