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58 lines
1.4 KiB
58 lines
1.4 KiB
#pragma once
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//
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// Utils for Dallas OneWire bus (DS1820 etc)
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//
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#include <stdint.h>
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#include <stdbool.h>
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#define SKIP_ROM 0xCC
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#define CONVERT_T 0x44
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#define READ_SCRATCHPAD 0xBE
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/** Perform bus reset. Returns true if any device is connected */
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bool ow_reset(const uint8_t pin);
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/** Send a single byte */
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void ow_send(const uint8_t pin, const uint8_t byte);
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/** Read a single byte */
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uint8_t ow_read(const uint8_t pin);
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/** Wait until the device is ready. Returns false on timeout */
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bool ow_wait_ready(const uint8_t pin);
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/** Read bytes into an array */
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void ow_read_arr(const uint8_t pin, uint8_t* array, const uint8_t count);
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/** Compute a CRC16 checksum */
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uint16_t crc16(uint8_t *data, uint8_t len);
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/** Compute a CRC8 checksum */
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uint8_t crc8(uint8_t *addr, uint8_t len);
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// --- utils for DS1820 ---
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#define TEMP_ERROR -32768
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/**
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* Read temperature in 0.0625°C, or TEMP_ERROR on error
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* Use this where you'd normally use READ_SCRATCHPAD
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*/
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int16_t ds1820_read_temp(uint8_t pin);
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/**
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* Read temperature in 0.1°C, or TEMP_ERROR on error
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* Use this where you'd normally use READ_SCRATCHPAD
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*/
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int16_t ds1820_read_temp_c(uint8_t pin);
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/**
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* Perform a temperature measurement with single DS1820 device on the line
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* Can be followed by a call to read temperature (READ_SCRATCHPAD).
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*
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* Returns false on failure (device not connected)
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*/
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bool ds1820_single_measure(uint8_t pin);
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