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.
52 lines
1.1 KiB
52 lines
1.1 KiB
10 years ago
|
#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(const uint8_t pin);
|
||
|
|
|
||
|
|
/** Send a single byte */
|
||
|
|
void ow_send(const uint8_t pin, const uint8_t byte);
|
||
|
|
|
||
|
|
/** Read a single byte */
|
||
|
|
uint8_t ow_read(const uint8_t pin);
|
||
|
|
|
||
|
|
/** Wait until the device is ready. Returns false on timeout */
|
||
|
|
bool ow_wait_ready(const uint8_t pin);
|
||
|
|
|
||
|
|
/** Read bytes into an array */
|
||
|
|
void ow_read_arr(const uint8_t pin, uint8_t* array, const 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 ds1820_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 ds1820_read_temp_c(uint8_t pin);
|
||
|
|
|