250 lines
9.9 KiB
C++
250 lines
9.9 KiB
C++
#ifndef OneWire_h
|
|
#define OneWire_h
|
|
|
|
#include <inttypes.h>
|
|
|
|
//#if ARDUINO >= 100
|
|
#include "Arduino.h" // for delayMicroseconds, digitalPinToBitMask, etc
|
|
//#else
|
|
//#include "WProgram.h" // for delayMicroseconds
|
|
//#include "pins_arduino.h" // for digitalPinToBitMask, etc
|
|
//#endif
|
|
|
|
// You can exclude certain features from OneWire. In theory, this
|
|
// might save some space. In practice, the compiler automatically
|
|
// removes unused code (technically, the linker, using -fdata-sections
|
|
// and -ffunction-sections when compiling, and Wl,--gc-sections
|
|
// when linking), so most of these will not result in any code size
|
|
// reduction. Well, unless you try to use the missing features
|
|
// and redesign your program to not need them! ONEWIRE_CRC8_TABLE
|
|
// is the exception, because it selects a fast but large algorithm
|
|
// or a small but slow algorithm.
|
|
|
|
// you can exclude onewire_search by defining that to 0
|
|
#ifndef ONEWIRE_SEARCH
|
|
#define ONEWIRE_SEARCH 1
|
|
#endif
|
|
|
|
// You can exclude CRC checks altogether by defining this to 0
|
|
#ifndef ONEWIRE_CRC
|
|
#define ONEWIRE_CRC 1
|
|
#endif
|
|
|
|
// Select the table-lookup method of computing the 8-bit CRC
|
|
// by setting this to 1. The lookup table enlarges code size by
|
|
// about 250 bytes. It does NOT consume RAM (but did in very
|
|
// old versions of OneWire). If you disable this, a slower
|
|
// but very compact algorithm is used.
|
|
#ifndef ONEWIRE_CRC8_TABLE
|
|
#define ONEWIRE_CRC8_TABLE 1
|
|
#endif
|
|
|
|
// You can allow 16-bit CRC checks by defining this to 1
|
|
// (Note that ONEWIRE_CRC must also be 1.)
|
|
#ifndef ONEWIRE_CRC16
|
|
#define ONEWIRE_CRC16 1
|
|
#endif
|
|
|
|
#define FALSE 0
|
|
#define TRUE 1
|
|
|
|
// Platform specific I/O definitions
|
|
|
|
#if defined(__AVR__)
|
|
#define PIN_TO_BASEREG(pin) (portInputRegister(digitalPinToPort(pin)))
|
|
#define PIN_TO_BITMASK(pin) (digitalPinToBitMask(pin))
|
|
#define IO_REG_TYPE uint8_t
|
|
#define IO_REG_ASM asm("r30")
|
|
#define DIRECT_READ(base, mask) (((*(base)) & (mask)) ? 1 : 0)
|
|
#define DIRECT_MODE_INPUT(base, mask) ((*((base)+1)) &= ~(mask))
|
|
#define DIRECT_MODE_OUTPUT(base, mask) ((*((base)+1)) |= (mask))
|
|
#define DIRECT_WRITE_LOW(base, mask) ((*((base)+2)) &= ~(mask))
|
|
#define DIRECT_WRITE_HIGH(base, mask) ((*((base)+2)) |= (mask))
|
|
|
|
#elif defined(__MK20DX128__) || defined(__MK20DX256__)
|
|
#define PIN_TO_BASEREG(pin) (portOutputRegister(pin))
|
|
#define PIN_TO_BITMASK(pin) (1)
|
|
#define IO_REG_TYPE uint8_t
|
|
#define IO_REG_ASM
|
|
#define DIRECT_READ(base, mask) (*((base)+512))
|
|
#define DIRECT_MODE_INPUT(base, mask) (*((base)+640) = 0)
|
|
#define DIRECT_MODE_OUTPUT(base, mask) (*((base)+640) = 1)
|
|
#define DIRECT_WRITE_LOW(base, mask) (*((base)+256) = 1)
|
|
#define DIRECT_WRITE_HIGH(base, mask) (*((base)+128) = 1)
|
|
|
|
#elif defined(__MKL26Z64__)
|
|
#define PIN_TO_BASEREG(pin) (portOutputRegister(pin))
|
|
#define PIN_TO_BITMASK(pin) (digitalPinToBitMask(pin))
|
|
#define IO_REG_TYPE uint8_t
|
|
#define IO_REG_ASM
|
|
#define DIRECT_READ(base, mask) ((*((base)+16) & (mask)) ? 1 : 0)
|
|
#define DIRECT_MODE_INPUT(base, mask) (*((base)+20) &= ~(mask))
|
|
#define DIRECT_MODE_OUTPUT(base, mask) (*((base)+20) |= (mask))
|
|
#define DIRECT_WRITE_LOW(base, mask) (*((base)+8) = (mask))
|
|
#define DIRECT_WRITE_HIGH(base, mask) (*((base)+4) = (mask))
|
|
|
|
#elif defined(__SAM3X8E__)
|
|
// Arduino 1.5.1 may have a bug in delayMicroseconds() on Arduino Due.
|
|
// http://arduino.cc/forum/index.php/topic,141030.msg1076268.html#msg1076268
|
|
// If you have trouble with OneWire on Arduino Due, please check the
|
|
// status of delayMicroseconds() before reporting a bug in OneWire!
|
|
#define PIN_TO_BASEREG(pin) (&(digitalPinToPort(pin)->PIO_PER))
|
|
#define PIN_TO_BITMASK(pin) (digitalPinToBitMask(pin))
|
|
#define IO_REG_TYPE uint32_t
|
|
#define IO_REG_ASM
|
|
#define DIRECT_READ(base, mask) (((*((base)+15)) & (mask)) ? 1 : 0)
|
|
#define DIRECT_MODE_INPUT(base, mask) ((*((base)+5)) = (mask))
|
|
#define DIRECT_MODE_OUTPUT(base, mask) ((*((base)+4)) = (mask))
|
|
#define DIRECT_WRITE_LOW(base, mask) ((*((base)+13)) = (mask))
|
|
#define DIRECT_WRITE_HIGH(base, mask) ((*((base)+12)) = (mask))
|
|
#ifndef PROGMEM
|
|
#define PROGMEM
|
|
#endif
|
|
#ifndef pgm_read_byte
|
|
#define pgm_read_byte(addr) (*(const uint8_t *)(addr))
|
|
#endif
|
|
|
|
#elif defined(__PIC32MX__)
|
|
#define PIN_TO_BASEREG(pin) (portModeRegister(digitalPinToPort(pin)))
|
|
#define PIN_TO_BITMASK(pin) (digitalPinToBitMask(pin))
|
|
#define IO_REG_TYPE uint32_t
|
|
#define IO_REG_ASM
|
|
#define DIRECT_READ(base, mask) (((*(base+4)) & (mask)) ? 1 : 0) //PORTX + 0x10
|
|
#define DIRECT_MODE_INPUT(base, mask) ((*(base+2)) = (mask)) //TRISXSET + 0x08
|
|
#define DIRECT_MODE_OUTPUT(base, mask) ((*(base+1)) = (mask)) //TRISXCLR + 0x04
|
|
#define DIRECT_WRITE_LOW(base, mask) ((*(base+8+1)) = (mask)) //LATXCLR + 0x24
|
|
#define DIRECT_WRITE_HIGH(base, mask) ((*(base+8+2)) = (mask)) //LATXSET + 0x28
|
|
|
|
#else
|
|
#define PIN_TO_BASEREG(pin) (0)
|
|
#define PIN_TO_BITMASK(pin) (pin)
|
|
#define IO_REG_TYPE unsigned int
|
|
#define IO_REG_ASM
|
|
#define DIRECT_READ(base, pin) digitalRead(pin)
|
|
#define DIRECT_WRITE_LOW(base, pin) digitalWrite(pin, LOW)
|
|
#define DIRECT_WRITE_HIGH(base, pin) digitalWrite(pin, HIGH)
|
|
#define DIRECT_MODE_INPUT(base, pin) pinMode(pin,INPUT)
|
|
#define DIRECT_MODE_OUTPUT(base, pin) pinMode(pin,OUTPUT)
|
|
#warning "OneWire. Fallback mode. Using API calls for pinMode,digitalRead and digitalWrite. Operation of this library is not guaranteed on this architecture."
|
|
|
|
#endif
|
|
|
|
|
|
class OneWire
|
|
{
|
|
private:
|
|
IO_REG_TYPE bitmask;
|
|
volatile IO_REG_TYPE *baseReg;
|
|
|
|
#if ONEWIRE_SEARCH
|
|
// global search state
|
|
unsigned char ROM_NO[8];
|
|
uint8_t LastDiscrepancy;
|
|
uint8_t LastFamilyDiscrepancy;
|
|
uint8_t LastDeviceFlag;
|
|
#endif
|
|
|
|
public:
|
|
OneWire( uint8_t pin);
|
|
|
|
// Perform a 1-Wire reset cycle. Returns 1 if a device responds
|
|
// with a presence pulse. Returns 0 if there is no device or the
|
|
// bus is shorted or otherwise held low for more than 250uS
|
|
uint8_t reset(void);
|
|
|
|
// Issue a 1-Wire rom select command, you do the reset first.
|
|
void select(const uint8_t rom[8]);
|
|
|
|
// Issue a 1-Wire rom skip command, to address all on bus.
|
|
void skip(void);
|
|
|
|
// Write a byte. If 'power' is one then the wire is held high at
|
|
// the end for parasitically powered devices. You are responsible
|
|
// for eventually depowering it by calling depower() or doing
|
|
// another read or write.
|
|
void write(uint8_t v, uint8_t power = 0);
|
|
|
|
void write_bytes(const uint8_t *buf, uint16_t count, bool power = 0);
|
|
|
|
// Read a byte.
|
|
uint8_t read(void);
|
|
|
|
void read_bytes(uint8_t *buf, uint16_t count);
|
|
|
|
// Write a bit. The bus is always left powered at the end, see
|
|
// note in write() about that.
|
|
void write_bit(uint8_t v);
|
|
|
|
// Read a bit.
|
|
uint8_t read_bit(void);
|
|
|
|
// Stop forcing power onto the bus. You only need to do this if
|
|
// you used the 'power' flag to write() or used a write_bit() call
|
|
// and aren't about to do another read or write. You would rather
|
|
// not leave this powered if you don't have to, just in case
|
|
// someone shorts your bus.
|
|
void depower(void);
|
|
|
|
#if ONEWIRE_SEARCH
|
|
// Clear the search state so that if will start from the beginning again.
|
|
void reset_search();
|
|
|
|
// Setup the search to find the device type 'family_code' on the next call
|
|
// to search(*newAddr) if it is present.
|
|
void target_search(uint8_t family_code);
|
|
|
|
// Look for the next device. Returns 1 if a new address has been
|
|
// returned. A zero might mean that the bus is shorted, there are
|
|
// no devices, or you have already retrieved all of them. It
|
|
// might be a good idea to check the CRC to make sure you didn't
|
|
// get garbage. The order is deterministic. You will always get
|
|
// the same devices in the same order.
|
|
uint8_t search(uint8_t *newAddr);
|
|
#endif
|
|
|
|
#if ONEWIRE_CRC
|
|
// Compute a Dallas Semiconductor 8 bit CRC, these are used in the
|
|
// ROM and scratchpad registers.
|
|
static uint8_t crc8(const uint8_t *addr, uint8_t len);
|
|
|
|
#if ONEWIRE_CRC16
|
|
// Compute the 1-Wire CRC16 and compare it against the received CRC.
|
|
// Example usage (reading a DS2408):
|
|
// // Put everything in a buffer so we can compute the CRC easily.
|
|
// uint8_t buf[13];
|
|
// buf[0] = 0xF0; // Read PIO Registers
|
|
// buf[1] = 0x88; // LSB address
|
|
// buf[2] = 0x00; // MSB address
|
|
// WriteBytes(net, buf, 3); // Write 3 cmd bytes
|
|
// ReadBytes(net, buf+3, 10); // Read 6 data bytes, 2 0xFF, 2 CRC16
|
|
// if (!CheckCRC16(buf, 11, &buf[11])) {
|
|
// // Handle error.
|
|
// }
|
|
//
|
|
// @param input - Array of bytes to checksum.
|
|
// @param len - How many bytes to use.
|
|
// @param inverted_crc - The two CRC16 bytes in the received data.
|
|
// This should just point into the received data,
|
|
// *not* at a 16-bit integer.
|
|
// @param crc - The crc starting value (optional)
|
|
// @return True, iff the CRC matches.
|
|
static bool check_crc16(const uint8_t* input, uint16_t len, const uint8_t* inverted_crc, uint16_t crc = 0);
|
|
|
|
// Compute a Dallas Semiconductor 16 bit CRC. This is required to check
|
|
// the integrity of data received from many 1-Wire devices. Note that the
|
|
// CRC computed here is *not* what you'll get from the 1-Wire network,
|
|
// for two reasons:
|
|
// 1) The CRC is transmitted bitwise inverted.
|
|
// 2) Depending on the endian-ness of your processor, the binary
|
|
// representation of the two-byte return value may have a different
|
|
// byte order than the two bytes you get from 1-Wire.
|
|
// @param input - Array of bytes to checksum.
|
|
// @param len - How many bytes to use.
|
|
// @param crc - The crc starting value (optional)
|
|
// @return The CRC16, as defined by Dallas Semiconductor.
|
|
static uint16_t crc16(const uint8_t* input, uint16_t len, uint16_t crc = 0);
|
|
#endif
|
|
#endif
|
|
};
|
|
|
|
#endif
|