| /trunk/libraries/OneWire/keywords.txt |
|---|
| 0,0 → 1,38 |
| ####################################### |
| # Syntax Coloring Map For OneWire |
| ####################################### |
| ####################################### |
| # Datatypes (KEYWORD1) |
| ####################################### |
| OneWire KEYWORD1 |
| ####################################### |
| # Methods and Functions (KEYWORD2) |
| ####################################### |
| reset KEYWORD2 |
| write_bit KEYWORD2 |
| read_bit KEYWORD2 |
| write KEYWORD2 |
| write_bytes KEYWORD2 |
| read KEYWORD2 |
| read_bytes KEYWORD2 |
| select KEYWORD2 |
| skip KEYWORD2 |
| depower KEYWORD2 |
| reset_search KEYWORD2 |
| search KEYWORD2 |
| crc8 KEYWORD2 |
| crc16 KEYWORD2 |
| check_crc16 KEYWORD2 |
| ####################################### |
| # Instances (KEYWORD2) |
| ####################################### |
| ####################################### |
| # Constants (LITERAL1) |
| ####################################### |
| /trunk/libraries/OneWire/OneWire.cpp |
|---|
| 0,0 → 1,527 |
| /* |
| Copyright (c) 2007, Jim Studt (original old version - many contributors since) |
| The latest version of this library may be found at: |
| http://www.pjrc.com/teensy/td_libs_OneWire.html |
| Version 2.1: |
| Arduino 1.0 compatibility, Paul Stoffregen |
| Improve temperature example, Paul Stoffregen |
| DS250x_PROM example, Guillermo Lovato |
| PIC32 (chipKit) compatibility, Jason Dangel, dangel.jason AT gmail.com |
| Improvements from Glenn Trewitt: |
| - crc16() now works |
| - check_crc16() does all of calculation/checking work. |
| - Added read_bytes() and write_bytes(), to reduce tedious loops. |
| - Added ds2408 example. |
| Delete very old, out-of-date readme file (info is here) |
| Version 2.0: Modifications by Paul Stoffregen, January 2010: |
| http://www.pjrc.com/teensy/td_libs_OneWire.html |
| Search fix from Robin James |
| http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1238032295/27#27 |
| Use direct optimized I/O in all cases |
| Disable interrupts during timing critical sections |
| (this solves many random communication errors) |
| Disable interrupts during read-modify-write I/O |
| Reduce RAM consumption by eliminating unnecessary |
| variables and trimming many to 8 bits |
| Optimize both crc8 - table version moved to flash |
| Modified to work with larger numbers of devices - avoids loop. |
| Tested in Arduino 11 alpha with 12 sensors. |
| 26 Sept 2008 -- Robin James |
| http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1238032295/27#27 |
| Updated to work with arduino-0008 and to include skip() as of |
| 2007/07/06. --RJL20 |
| Modified to calculate the 8-bit CRC directly, avoiding the need for |
| the 256-byte lookup table to be loaded in RAM. Tested in arduino-0010 |
| -- Tom Pollard, Jan 23, 2008 |
| Jim Studt's original library was modified by Josh Larios. |
| Tom Pollard, pollard@alum.mit.edu, contributed around May 20, 2008 |
| Permission is hereby granted, free of charge, to any person obtaining |
| a copy of this software and associated documentation files (the |
| "Software"), to deal in the Software without restriction, including |
| without limitation the rights to use, copy, modify, merge, publish, |
| distribute, sublicense, and/or sell copies of the Software, and to |
| permit persons to whom the Software is furnished to do so, subject to |
| the following conditions: |
| The above copyright notice and this permission notice shall be |
| included in all copies or substantial portions of the Software. |
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE |
| LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION |
| OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION |
| WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| Much of the code was inspired by Derek Yerger's code, though I don't |
| think much of that remains. In any event that was.. |
| (copyleft) 2006 by Derek Yerger - Free to distribute freely. |
| The CRC code was excerpted and inspired by the Dallas Semiconductor |
| sample code bearing this copyright. |
| //--------------------------------------------------------------------------- |
| // Copyright (C) 2000 Dallas Semiconductor Corporation, All Rights Reserved. |
| // |
| // Permission is hereby granted, free of charge, to any person obtaining a |
| // copy of this software and associated documentation files (the "Software"), |
| // to deal in the Software without restriction, including without limitation |
| // the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| // and/or sell copies of the Software, and to permit persons to whom the |
| // Software is furnished to do so, subject to the following conditions: |
| // |
| // The above copyright notice and this permission notice shall be included |
| // in all copies or substantial portions of the Software. |
| // |
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
| // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
| // IN NO EVENT SHALL DALLAS SEMICONDUCTOR BE LIABLE FOR ANY CLAIM, DAMAGES |
| // OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
| // ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
| // OTHER DEALINGS IN THE SOFTWARE. |
| // |
| // Except as contained in this notice, the name of Dallas Semiconductor |
| // shall not be used except as stated in the Dallas Semiconductor |
| // Branding Policy. |
| //-------------------------------------------------------------------------- |
| */ |
| #include "OneWire.h" |
| OneWire::OneWire(uint8_t pin) |
| { |
| pinMode(pin, INPUT); |
| bitmask = PIN_TO_BITMASK(pin); |
| baseReg = PIN_TO_BASEREG(pin); |
| #if ONEWIRE_SEARCH |
| reset_search(); |
| #endif |
| } |
| // Perform the onewire reset function. We will wait up to 250uS for |
| // the bus to come high, if it doesn't then it is broken or shorted |
| // and we return a 0; |
| // |
| // Returns 1 if a device asserted a presence pulse, 0 otherwise. |
| // |
| uint8_t OneWire::reset(void) |
| { |
| IO_REG_TYPE mask = bitmask; |
| volatile IO_REG_TYPE *reg IO_REG_ASM = baseReg; |
| uint8_t r; |
| uint8_t retries = 125; |
| noInterrupts(); |
| DIRECT_MODE_INPUT(reg, mask); |
| interrupts(); |
| // wait until the wire is high... just in case |
| do { |
| if (--retries == 0) return 0; |
| delayMicroseconds(2); |
| } while ( !DIRECT_READ(reg, mask)); |
| noInterrupts(); |
| DIRECT_WRITE_LOW(reg, mask); |
| DIRECT_MODE_OUTPUT(reg, mask); // drive output low |
| interrupts(); |
| delayMicroseconds(500); |
| noInterrupts(); |
| DIRECT_MODE_INPUT(reg, mask); // allow it to float |
| delayMicroseconds(80); |
| r = !DIRECT_READ(reg, mask); |
| interrupts(); |
| delayMicroseconds(420); |
| return r; |
| } |
| // |
| // Write a bit. Port and bit is used to cut lookup time and provide |
| // more certain timing. |
| // |
| void OneWire::write_bit(uint8_t v) |
| { |
| IO_REG_TYPE mask=bitmask; |
| volatile IO_REG_TYPE *reg IO_REG_ASM = baseReg; |
| if (v & 1) { |
| noInterrupts(); |
| DIRECT_WRITE_LOW(reg, mask); |
| DIRECT_MODE_OUTPUT(reg, mask); // drive output low |
| delayMicroseconds(10); |
| DIRECT_WRITE_HIGH(reg, mask); // drive output high |
| interrupts(); |
| delayMicroseconds(55); |
| } else { |
| noInterrupts(); |
| DIRECT_WRITE_LOW(reg, mask); |
| DIRECT_MODE_OUTPUT(reg, mask); // drive output low |
| delayMicroseconds(65); |
| DIRECT_WRITE_HIGH(reg, mask); // drive output high |
| interrupts(); |
| delayMicroseconds(5); |
| } |
| } |
| // |
| // Read a bit. Port and bit is used to cut lookup time and provide |
| // more certain timing. |
| // |
| uint8_t OneWire::read_bit(void) |
| { |
| IO_REG_TYPE mask=bitmask; |
| volatile IO_REG_TYPE *reg IO_REG_ASM = baseReg; |
| uint8_t r; |
| noInterrupts(); |
| DIRECT_MODE_OUTPUT(reg, mask); |
| DIRECT_WRITE_LOW(reg, mask); |
| delayMicroseconds(3); |
| DIRECT_MODE_INPUT(reg, mask); // let pin float, pull up will raise |
| delayMicroseconds(10); |
| r = DIRECT_READ(reg, mask); |
| interrupts(); |
| delayMicroseconds(53); |
| return r; |
| } |
| // |
| // Write a byte. The writing code uses the active drivers to raise the |
| // pin high, if you need power after the write (e.g. DS18S20 in |
| // parasite power mode) then set 'power' to 1, otherwise the pin will |
| // go tri-state at the end of the write to avoid heating in a short or |
| // other mishap. |
| // |
| void OneWire::write(uint8_t v, uint8_t power /* = 0 */) { |
| uint8_t bitMask; |
| for (bitMask = 0x01; bitMask; bitMask <<= 1) { |
| OneWire::write_bit( (bitMask & v)?1:0); |
| } |
| if ( !power) { |
| noInterrupts(); |
| DIRECT_MODE_INPUT(baseReg, bitmask); |
| DIRECT_WRITE_LOW(baseReg, bitmask); |
| interrupts(); |
| } |
| } |
| void OneWire::write_bytes(const uint8_t *buf, uint16_t count, bool power /* = 0 */) { |
| for (uint16_t i = 0 ; i < count ; i++) |
| write(buf[i]); |
| if (!power) { |
| noInterrupts(); |
| DIRECT_MODE_INPUT(baseReg, bitmask); |
| DIRECT_WRITE_LOW(baseReg, bitmask); |
| interrupts(); |
| } |
| } |
| // |
| // Read a byte |
| // |
| uint8_t OneWire::read() { |
| uint8_t bitMask; |
| uint8_t r = 0; |
| for (bitMask = 0x01; bitMask; bitMask <<= 1) { |
| if ( OneWire::read_bit()) r |= bitMask; |
| } |
| return r; |
| } |
| void OneWire::read_bytes(uint8_t *buf, uint16_t count) { |
| for (uint16_t i = 0 ; i < count ; i++) |
| buf[i] = read(); |
| } |
| // |
| // Do a ROM select |
| // |
| void OneWire::select( uint8_t rom[8]) |
| { |
| int i; |
| write(0x55); // Choose ROM |
| for( i = 0; i < 8; i++) write(rom[i]); |
| } |
| // |
| // Do a ROM skip |
| // |
| void OneWire::skip() |
| { |
| write(0xCC); // Skip ROM |
| } |
| void OneWire::depower() |
| { |
| noInterrupts(); |
| DIRECT_MODE_INPUT(baseReg, bitmask); |
| interrupts(); |
| } |
| #if ONEWIRE_SEARCH |
| // |
| // You need to use this function to start a search again from the beginning. |
| // You do not need to do it for the first search, though you could. |
| // |
| void OneWire::reset_search() |
| { |
| // reset the search state |
| LastDiscrepancy = 0; |
| LastDeviceFlag = FALSE; |
| LastFamilyDiscrepancy = 0; |
| for(int i = 7; ; i--) |
| { |
| ROM_NO[i] = 0; |
| if ( i == 0) break; |
| } |
| } |
| // |
| // Perform a search. If this function returns a '1' then it has |
| // enumerated the next device and you may retrieve the ROM from the |
| // OneWire::address variable. If there are no devices, no further |
| // devices, or something horrible happens in the middle of the |
| // enumeration then a 0 is returned. If a new device is found then |
| // its address is copied to newAddr. Use OneWire::reset_search() to |
| // start over. |
| // |
| // --- Replaced by the one from the Dallas Semiconductor web site --- |
| //-------------------------------------------------------------------------- |
| // Perform the 1-Wire Search Algorithm on the 1-Wire bus using the existing |
| // search state. |
| // Return TRUE : device found, ROM number in ROM_NO buffer |
| // FALSE : device not found, end of search |
| // |
| uint8_t OneWire::search(uint8_t *newAddr) |
| { |
| uint8_t id_bit_number; |
| uint8_t last_zero, rom_byte_number, search_result; |
| uint8_t id_bit, cmp_id_bit; |
| unsigned char rom_byte_mask, search_direction; |
| // initialize for search |
| id_bit_number = 1; |
| last_zero = 0; |
| rom_byte_number = 0; |
| rom_byte_mask = 1; |
| search_result = 0; |
| // if the last call was not the last one |
| if (!LastDeviceFlag) |
| { |
| // 1-Wire reset |
| if (!reset()) |
| { |
| // reset the search |
| LastDiscrepancy = 0; |
| LastDeviceFlag = FALSE; |
| LastFamilyDiscrepancy = 0; |
| return FALSE; |
| } |
| // issue the search command |
| write(0xF0); |
| // loop to do the search |
| do |
| { |
| // read a bit and its complement |
| id_bit = read_bit(); |
| cmp_id_bit = read_bit(); |
| // check for no devices on 1-wire |
| if ((id_bit == 1) && (cmp_id_bit == 1)) |
| break; |
| else |
| { |
| // all devices coupled have 0 or 1 |
| if (id_bit != cmp_id_bit) |
| search_direction = id_bit; // bit write value for search |
| else |
| { |
| // if this discrepancy if before the Last Discrepancy |
| // on a previous next then pick the same as last time |
| if (id_bit_number < LastDiscrepancy) |
| search_direction = ((ROM_NO[rom_byte_number] & rom_byte_mask) > 0); |
| else |
| // if equal to last pick 1, if not then pick 0 |
| search_direction = (id_bit_number == LastDiscrepancy); |
| // if 0 was picked then record its position in LastZero |
| if (search_direction == 0) |
| { |
| last_zero = id_bit_number; |
| // check for Last discrepancy in family |
| if (last_zero < 9) |
| LastFamilyDiscrepancy = last_zero; |
| } |
| } |
| // set or clear the bit in the ROM byte rom_byte_number |
| // with mask rom_byte_mask |
| if (search_direction == 1) |
| ROM_NO[rom_byte_number] |= rom_byte_mask; |
| else |
| ROM_NO[rom_byte_number] &= ~rom_byte_mask; |
| // serial number search direction write bit |
| write_bit(search_direction); |
| // increment the byte counter id_bit_number |
| // and shift the mask rom_byte_mask |
| id_bit_number++; |
| rom_byte_mask <<= 1; |
| // if the mask is 0 then go to new SerialNum byte rom_byte_number and reset mask |
| if (rom_byte_mask == 0) |
| { |
| rom_byte_number++; |
| rom_byte_mask = 1; |
| } |
| } |
| } |
| while(rom_byte_number < 8); // loop until through all ROM bytes 0-7 |
| // if the search was successful then |
| if (!(id_bit_number < 65)) |
| { |
| // search successful so set LastDiscrepancy,LastDeviceFlag,search_result |
| LastDiscrepancy = last_zero; |
| // check for last device |
| if (LastDiscrepancy == 0) |
| LastDeviceFlag = TRUE; |
| search_result = TRUE; |
| } |
| } |
| // if no device found then reset counters so next 'search' will be like a first |
| if (!search_result || !ROM_NO[0]) |
| { |
| LastDiscrepancy = 0; |
| LastDeviceFlag = FALSE; |
| LastFamilyDiscrepancy = 0; |
| search_result = FALSE; |
| } |
| for (int i = 0; i < 8; i++) newAddr[i] = ROM_NO[i]; |
| return search_result; |
| } |
| #endif |
| #if ONEWIRE_CRC |
| // The 1-Wire CRC scheme is described in Maxim Application Note 27: |
| // "Understanding and Using Cyclic Redundancy Checks with Maxim iButton Products" |
| // |
| #if ONEWIRE_CRC8_TABLE |
| // This table comes from Dallas sample code where it is freely reusable, |
| // though Copyright (C) 2000 Dallas Semiconductor Corporation |
| static const uint8_t PROGMEM dscrc_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}; |
| // |
| // Compute a Dallas Semiconductor 8 bit CRC. These show up in the ROM |
| // and the registers. (note: this might better be done without to |
| // table, it would probably be smaller and certainly fast enough |
| // compared to all those delayMicrosecond() calls. But I got |
| // confused, so I use this table from the examples.) |
| // |
| uint8_t OneWire::crc8( uint8_t *addr, uint8_t len) |
| { |
| uint8_t crc = 0; |
| while (len--) { |
| crc = pgm_read_byte(dscrc_table + (crc ^ *addr++)); |
| } |
| return crc; |
| } |
| #else |
| // |
| // Compute a Dallas Semiconductor 8 bit CRC directly. |
| // this is much slower, but much smaller, than the lookup table. |
| // |
| uint8_t OneWire::crc8( uint8_t *addr, uint8_t len) |
| { |
| uint8_t crc = 0; |
| while (len--) { |
| uint8_t inbyte = *addr++; |
| for (uint8_t i = 8; i; i--) { |
| uint8_t mix = (crc ^ inbyte) & 0x01; |
| crc >>= 1; |
| if (mix) crc ^= 0x8C; |
| inbyte >>= 1; |
| } |
| } |
| return crc; |
| } |
| #endif |
| #if ONEWIRE_CRC16 |
| bool OneWire::check_crc16(uint8_t* input, uint16_t len, uint8_t* inverted_crc) |
| { |
| uint16_t crc = ~crc16(input, len); |
| return (crc & 0xFF) == inverted_crc[0] && (crc >> 8) == inverted_crc[1]; |
| } |
| uint16_t OneWire::crc16(uint8_t* input, uint16_t len) |
| { |
| static const uint8_t oddparity[16] = |
| { 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0 }; |
| uint16_t crc = 0; // Starting seed is zero. |
| for (uint16_t i = 0 ; i < len ; i++) { |
| // Even though we're just copying a byte from the input, |
| // we'll be doing 16-bit computation with it. |
| uint16_t cdata = input[i]; |
| cdata = (cdata ^ (crc & 0xff)) & 0xff; |
| crc >>= 8; |
| if (oddparity[cdata & 0x0F] ^ oddparity[cdata >> 4]) |
| crc ^= 0xC001; |
| cdata <<= 6; |
| crc ^= cdata; |
| cdata <<= 1; |
| crc ^= cdata; |
| } |
| return crc; |
| } |
| #endif |
| #endif |
| /trunk/libraries/OneWire/examples/DS250x_PROM/DS250x_PROM.pde |
|---|
| 0,0 → 1,90 |
| /* |
| DS250x add-only programmable memory reader w/SKIP ROM. |
| The DS250x is a 512/1024bit add-only PROM(you can add data but cannot change the old one) that's used mainly for device identification purposes |
| like serial number, mfgr data, unique identifiers, etc. It uses the Maxim 1-wire bus. |
| This sketch will use the SKIP ROM function that skips the 1-Wire search phase since we only have one device connected in the bus on digital pin 6. |
| If more than one device is connected to the bus, it will fail. |
| Sketch will not verify if device connected is from the DS250x family since the skip rom function effectively skips the family-id byte readout. |
| thus it is possible to run this sketch with any Maxim OneWire device in which case the command CRC will most likely fail. |
| Sketch will only read the first page of memory(32bits) starting from the lower address(0000h), if more than 1 device is present, then use the sketch with search functions. |
| Remember to put a 4.7K pullup resistor between pin 6 and +Vcc |
| To change the range or ammount of data to read, simply change the data array size, LSB/MSB addresses and for loop iterations |
| This example code is in the public domain and is provided AS-IS. |
| Built with Arduino 0022 and PJRC OneWire 2.0 library http://www.pjrc.com/teensy/td_libs_OneWire.html |
| created by Guillermo Lovato <glovato@gmail.com> |
| march/2011 |
| */ |
| #include <OneWire.h> |
| OneWire ds(6); // OneWire bus on digital pin 6 |
| void setup() { |
| Serial.begin (9600); |
| } |
| void loop() { |
| byte i; // This is for the for loops |
| boolean present; // device present var |
| byte data[32]; // container for the data from device |
| byte leemem[3] = { // array with the commands to initiate a read, DS250x devices expect 3 bytes to start a read: command,LSB&MSB adresses |
| 0xF0 , 0x00 , 0x00 }; // 0xF0 is the Read Data command, followed by 00h 00h as starting address(the beginning, 0000h) |
| byte ccrc; // Variable to store the command CRC |
| byte ccrc_calc; |
| present = ds.reset(); // OneWire bus reset, always needed to start operation on the bus, returns a 1/TRUE if there's a device present. |
| ds.skip(); // Skip ROM search |
| if (present == TRUE){ // We only try to read the data if there's a device present |
| Serial.println("DS250x device present"); |
| ds.write(leemem[0],1); // Read data command, leave ghost power on |
| ds.write(leemem[1],1); // LSB starting address, leave ghost power on |
| ds.write(leemem[2],1); // MSB starting address, leave ghost power on |
| ccrc = ds.read(); // DS250x generates a CRC for the command we sent, we assign a read slot and store it's value |
| ccrc_calc = OneWire::crc8(leemem, 3); // We calculate the CRC of the commands we sent using the library function and store it |
| if ( ccrc_calc != ccrc) { // Then we compare it to the value the ds250x calculated, if it fails, we print debug messages and abort |
| Serial.println("Invalid command CRC!"); |
| Serial.print("Calculated CRC:"); |
| Serial.println(ccrc_calc,HEX); // HEX makes it easier to observe and compare |
| Serial.print("DS250x readback CRC:"); |
| Serial.println(ccrc,HEX); |
| return; // Since CRC failed, we abort the rest of the loop and start over |
| } |
| Serial.println("Data is: "); // For the printout of the data |
| for ( i = 0; i < 32; i++) { // Now it's time to read the PROM data itself, each page is 32 bytes so we need 32 read commands |
| data[i] = ds.read(); // we store each read byte to a different position in the data array |
| Serial.print(data[i]); // printout in ASCII |
| Serial.print(" "); // blank space |
| } |
| Serial.println(); |
| delay(5000); // Delay so we don't saturate the serial output |
| } |
| else { // Nothing is connected in the bus |
| Serial.println("Nothing connected"); |
| delay(3000); |
| } |
| } |
| /trunk/libraries/OneWire/examples/DS2408_Switch/DS2408_Switch.pde |
|---|
| 0,0 → 1,77 |
| #include <OneWire.h> |
| /* |
| * DS2408 8-Channel Addressable Switch |
| * |
| * Writte by Glenn Trewitt, glenn at trewitt dot org |
| * |
| * Some notes about the DS2408: |
| * - Unlike most input/output ports, the DS2408 doesn't have mode bits to |
| * set whether the pins are input or output. If you issue a read command, |
| * they're inputs. If you write to them, they're outputs. |
| * - For reading from a switch, you should use 10K pull-up resisters. |
| */ |
| void PrintBytes(uint8_t* addr, uint8_t count, bool newline=0) { |
| for (uint8_t i = 0; i < count; i++) { |
| Serial.print(addr[i]>>4, HEX); |
| Serial.print(addr[i]&0x0f, HEX); |
| } |
| if (newline) |
| Serial.println(); |
| } |
| void ReadAndReport(OneWire* net, uint8_t* addr) { |
| Serial.print(" Reading DS2408 "); |
| PrintBytes(addr, 8); |
| Serial.println(); |
| uint8_t buf[13]; // Put everything in the buffer so we can compute CRC easily. |
| buf[0] = 0xF0; // Read PIO Registers |
| buf[1] = 0x88; // LSB address |
| buf[2] = 0x00; // MSB address |
| net->write_bytes(buf, 3); |
| net->read_bytes(buf+3, 10); // 3 cmd bytes, 6 data bytes, 2 0xFF, 2 CRC16 |
| net->reset(); |
| if (!OneWire::check_crc16(buf, 11, &buf[11])) { |
| Serial.print("CRC failure in DS2408 at "); |
| PrintBytes(addr, 8, true); |
| return; |
| } |
| Serial.print(" DS2408 data = "); |
| // First 3 bytes contain command, register address. |
| Serial.println(buf[3], BIN); |
| } |
| OneWire net(10); // on pin 10 |
| void setup(void) { |
| Serial.begin(9600); |
| } |
| void loop(void) { |
| byte i; |
| byte present = 0; |
| byte addr[8]; |
| if (!net.search(addr)) { |
| Serial.print("No more addresses.\n"); |
| net.reset_search(); |
| delay(1000); |
| return; |
| } |
| if (OneWire::crc8(addr, 7) != addr[7]) { |
| Serial.print("CRC is not valid!\n"); |
| return; |
| } |
| if (addr[0] != 0x29) { |
| PrintBytes(addr, 8); |
| Serial.print(" is not a DS2408.\n"); |
| return; |
| } |
| ReadAndReport(&net, addr); |
| } |
| /trunk/libraries/OneWire/examples/DS18x20_Temperature/DS18x20_Temperature.pde |
|---|
| 0,0 → 1,109 |
| #include <OneWire.h> |
| // OneWire DS18S20, DS18B20, DS1822 Temperature Example |
| // |
| // http://www.pjrc.com/teensy/td_libs_OneWire.html |
| // |
| // The DallasTemperature library can do all this work for you! |
| // http://milesburton.com/Dallas_Temperature_Control_Library |
| OneWire ds(10); // on pin 10 |
| void setup(void) { |
| Serial.begin(9600); |
| } |
| void loop(void) { |
| byte i; |
| byte present = 0; |
| byte type_s; |
| byte data[12]; |
| byte addr[8]; |
| float celsius, fahrenheit; |
| if ( !ds.search(addr)) { |
| Serial.println("No more addresses."); |
| Serial.println(); |
| ds.reset_search(); |
| delay(250); |
| return; |
| } |
| Serial.print("ROM ="); |
| for( i = 0; i < 8; i++) { |
| Serial.write(' '); |
| Serial.print(addr[i], HEX); |
| } |
| if (OneWire::crc8(addr, 7) != addr[7]) { |
| Serial.println("CRC is not valid!"); |
| return; |
| } |
| Serial.println(); |
| // the first ROM byte indicates which chip |
| switch (addr[0]) { |
| case 0x10: |
| Serial.println(" Chip = DS18S20"); // or old DS1820 |
| type_s = 1; |
| break; |
| case 0x28: |
| Serial.println(" Chip = DS18B20"); |
| type_s = 0; |
| break; |
| case 0x22: |
| Serial.println(" Chip = DS1822"); |
| type_s = 0; |
| break; |
| default: |
| Serial.println("Device is not a DS18x20 family device."); |
| return; |
| } |
| ds.reset(); |
| ds.select(addr); |
| ds.write(0x44,1); // start conversion, with parasite power on at the end |
| delay(1000); // maybe 750ms is enough, maybe not |
| // we might do a ds.depower() here, but the reset will take care of it. |
| present = ds.reset(); |
| ds.select(addr); |
| ds.write(0xBE); // Read Scratchpad |
| Serial.print(" Data = "); |
| Serial.print(present,HEX); |
| Serial.print(" "); |
| for ( i = 0; i < 9; i++) { // we need 9 bytes |
| data[i] = ds.read(); |
| Serial.print(data[i], HEX); |
| Serial.print(" "); |
| } |
| Serial.print(" CRC="); |
| Serial.print(OneWire::crc8(data, 8), HEX); |
| Serial.println(); |
| // convert the data to actual temperature |
| unsigned int raw = (data[1] << 8) | data[0]; |
| if (type_s) { |
| raw = raw << 3; // 9 bit resolution default |
| if (data[7] == 0x10) { |
| // count remain gives full 12 bit resolution |
| raw = (raw & 0xFFF0) + 12 - data[6]; |
| } |
| } else { |
| byte cfg = (data[4] & 0x60); |
| if (cfg == 0x00) raw = raw << 3; // 9 bit resolution, 93.75 ms |
| else if (cfg == 0x20) raw = raw << 2; // 10 bit res, 187.5 ms |
| else if (cfg == 0x40) raw = raw << 1; // 11 bit res, 375 ms |
| // default is 12 bit resolution, 750 ms conversion time |
| } |
| celsius = (float)raw / 16.0; |
| fahrenheit = celsius * 1.8 + 32.0; |
| Serial.print(" Temperature = "); |
| Serial.print(celsius); |
| Serial.print(" Celsius, "); |
| Serial.print(fahrenheit); |
| Serial.println(" Fahrenheit"); |
| } |
| /trunk/libraries/OneWire/OneWire.h |
|---|
| 0,0 → 1,192 |
| #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(__PIC32MX__) |
| #include <plib.h> // is this necessary? |
| #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 |
| #error "Please define I/O register types here" |
| #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( 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(); |
| // 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( 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. |
| // @return True, iff the CRC matches. |
| static bool check_crc16(uint8_t* input, uint16_t len, uint8_t* inverted_crc); |
| // 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. |
| // @return The CRC16, as defined by Dallas Semiconductor. |
| static uint16_t crc16(uint8_t* input, uint16_t len); |
| #endif |
| #endif |
| }; |
| #endif |