Francis CHATAIN / Mbed 2 deprecated MSNV2-Terminal_V1-6

Version FC

Dependencies:   DmTftLibrary eeprom SX1280Lib filesystem mbed

Fork of MSNV2-Terminal_V1-5 by Francis CHATAIN

COMPONENTS/ds18b20_component.hpp@26:271d2d510f6c, 2018-09-18 (annotated)

Committer:
lo
Date:
Tue Sep 18 19:41:38 2018 +0000
Revision:
26:271d2d510f6c
Child:
31:2b8b98f3feed
added components implementations

Who changed what in which revision?

UserRevisionLine numberNew contents of line
lo 26:271d2d510f6c 1 /*
lo 26:271d2d510f6c 2 * DS18B20.hpp
lo 26:271d2d510f6c 3 *
lo 26:271d2d510f6c 4 * Created on: 18 sept. 2018
lo 26:271d2d510f6c 5 * Author: hoel
lo 26:271d2d510f6c 6 */
lo 26:271d2d510f6c 7
lo 26:271d2d510f6c 8 #ifndef DS18B20_COMPONENT_HPP_
lo 26:271d2d510f6c 9 #define DS18B20_COMPONENT_HPP_
lo 26:271d2d510f6c 10
lo 26:271d2d510f6c 11 #include <iostream>
lo 26:271d2d510f6c 12 #include <cstdlib>
lo 26:271d2d510f6c 13 #include "mbed.h"
lo 26:271d2d510f6c 14 #include "Context.h"
lo 26:271d2d510f6c 15 #include "Service.hpp"
lo 26:271d2d510f6c 16 #include "Component.hpp"
lo 26:271d2d510f6c 17 #include "LinkedList.h"
lo 26:271d2d510f6c 18
lo 26:271d2d510f6c 19 using namespace std;
lo 26:271d2d510f6c 20 using namespace misnet;
lo 26:271d2d510f6c 21
lo 26:271d2d510f6c 22 #define FAMILY_CODE _ROM[0]
lo 26:271d2d510f6c 23 #define FAMILY_CODE_DS1820 0x10
lo 26:271d2d510f6c 24 #define FAMILY_CODE_DS18B20 0x28
lo 26:271d2d510f6c 25 #define FAMILY_CODE_DS1822 0x22
lo 26:271d2d510f6c 26 #define ONEWIRE_INPUT(pin) pin->input()
lo 26:271d2d510f6c 27 #define ONEWIRE_OUTPUT(pin) pin->output()
lo 26:271d2d510f6c 28 #define ONEWIRE_INIT(pin)
lo 26:271d2d510f6c 29 #define INIT_DELAY
lo 26:271d2d510f6c 30 #define ONEWIRE_DELAY_US(value) wait_us(value)
lo 26:271d2d510f6c 31
lo 26:271d2d510f6c 32 class ds18b20_component : public Component{
lo 26:271d2d510f6c 33
lo 26:271d2d510f6c 34 public:
lo 26:271d2d510f6c 35 enum devices{
lo 26:271d2d510f6c 36 this_device, // command applies to only this device
lo 26:271d2d510f6c 37 all_devices }; // command applies to all devices
lo 26:271d2d510f6c 38 enum { invalid_conversion = -1000 };
lo 26:271d2d510f6c 39 ds18b20_component (COMPONENT_ID id, vector<Service*>& services, PinName data_pin, PinName power_pin, bool power_polarity) :
lo 26:271d2d510f6c 40 _datapin(data_pin),
lo 26:271d2d510f6c 41 _parasitepin(power_pin)
lo 26:271d2d510f6c 42 {
lo 26:271d2d510f6c 43 this->setServices(services);
lo 26:271d2d510f6c 44 this->setId(id);
lo 26:271d2d510f6c 45 if(power_pin) _parasite_power = true;
lo 26:271d2d510f6c 46 _power_polarity = power_polarity;
lo 26:271d2d510f6c 47 _power_mosfet = power_pin != NC;
lo 26:271d2d510f6c 48 }
lo 26:271d2d510f6c 49 ~ds18b20_component();
lo 26:271d2d510f6c 50 void init(void){
lo 26:271d2d510f6c 51
lo 26:271d2d510f6c 52 int byte_counter;
lo 26:271d2d510f6c 53 for(byte_counter=0;byte_counter<9;byte_counter++)
lo 26:271d2d510f6c 54 RAM[byte_counter] = 0x00;
lo 26:271d2d510f6c 55
lo 26:271d2d510f6c 56 ONEWIRE_INIT((&_datapin));
lo 26:271d2d510f6c 57 INIT_DELAY;
lo 26:271d2d510f6c 58
lo 26:271d2d510f6c 59 if (!unassignedProbe(&_datapin, _ROM))
lo 26:271d2d510f6c 60 error("No unassigned DS18B20_component found!\n");
lo 26:271d2d510f6c 61 else {
lo 26:271d2d510f6c 62 _datapin.input();
lo 26:271d2d510f6c 63 probes.append(this);
lo 26:271d2d510f6c 64 _parasite_power = !read_power_supply(devices::this_device);
lo 26:271d2d510f6c 65 }
lo 26:271d2d510f6c 66 }
lo 26:271d2d510f6c 67 bool onewire_reset(DigitalInOut *pin) {
lo 26:271d2d510f6c 68 // This will return false if no devices are present on the data bus
lo 26:271d2d510f6c 69 bool presence=false;
lo 26:271d2d510f6c 70 ONEWIRE_OUTPUT(pin);
lo 26:271d2d510f6c 71 pin->write(0); // bring low for 500 us
lo 26:271d2d510f6c 72 ONEWIRE_DELAY_US(500);
lo 26:271d2d510f6c 73 ONEWIRE_INPUT(pin); // let the data line float high
lo 26:271d2d510f6c 74 ONEWIRE_DELAY_US(90); // wait 90us
lo 26:271d2d510f6c 75 if (pin->read()==0) // see if any devices are pulling the data line low
lo 26:271d2d510f6c 76 presence=true;
lo 26:271d2d510f6c 77 ONEWIRE_DELAY_US(410);
lo 26:271d2d510f6c 78 return presence;
lo 26:271d2d510f6c 79 }
lo 26:271d2d510f6c 80 void onewire_bit_out (DigitalInOut *pin, bool bit_data) {
lo 26:271d2d510f6c 81 ONEWIRE_OUTPUT(pin);
lo 26:271d2d510f6c 82 pin->write(0);
lo 26:271d2d510f6c 83 ONEWIRE_DELAY_US(3); // DXP modified from 5
lo 26:271d2d510f6c 84 if (bit_data) {
lo 26:271d2d510f6c 85 pin->write(1); // bring data line high
lo 26:271d2d510f6c 86 ONEWIRE_DELAY_US(55);
lo 26:271d2d510f6c 87 } else {
lo 26:271d2d510f6c 88 ONEWIRE_DELAY_US(55); // keep data line low
lo 26:271d2d510f6c 89 pin->write(1);
lo 26:271d2d510f6c 90 ONEWIRE_DELAY_US(10); // DXP added to allow bus to float high before next bit_out
lo 26:271d2d510f6c 91 }
lo 26:271d2d510f6c 92
lo 26:271d2d510f6c 93 }
lo 26:271d2d510f6c 94 void onewire_byte_out(char data) { // output data character (least sig bit first).
lo 26:271d2d510f6c 95 int n;
lo 26:271d2d510f6c 96 //printf("Byte out 0x%02x\n", data);
lo 26:271d2d510f6c 97 for (n=0; n<8; n++) {
lo 26:271d2d510f6c 98 onewire_bit_out(&this->_datapin, data & 0x01);
lo 26:271d2d510f6c 99 data = data >> 1; // now the next bit is in the least sig bit position.
lo 26:271d2d510f6c 100 }
lo 26:271d2d510f6c 101
lo 26:271d2d510f6c 102 }
lo 26:271d2d510f6c 103 bool onewire_bit_in(DigitalInOut *pin) {
lo 26:271d2d510f6c 104 bool answer;
lo 26:271d2d510f6c 105 ONEWIRE_OUTPUT(pin);
lo 26:271d2d510f6c 106 pin->write(0);
lo 26:271d2d510f6c 107 ONEWIRE_DELAY_US(3); // DXP modofied from 5
lo 26:271d2d510f6c 108 ONEWIRE_INPUT(pin);
lo 26:271d2d510f6c 109 ONEWIRE_DELAY_US(10); // DXP modified from 5
lo 26:271d2d510f6c 110 answer = pin->read();
lo 26:271d2d510f6c 111 ONEWIRE_DELAY_US(45); // DXP modified from 50
lo 26:271d2d510f6c 112 return answer;
lo 26:271d2d510f6c 113 }
lo 26:271d2d510f6c 114 char onewire_byte_in() { // read byte, least sig byte first
lo 26:271d2d510f6c 115 char answer = 0x00;
lo 26:271d2d510f6c 116 int i;
lo 26:271d2d510f6c 117 for (i=0; i<8; i++) {
lo 26:271d2d510f6c 118 answer = answer >> 1; // shift over to make room for the next bit
lo 26:271d2d510f6c 119 if (onewire_bit_in(&this->_datapin))
lo 26:271d2d510f6c 120 answer = answer | 0x80; // if the data port is high, make this bit a 1
lo 26:271d2d510f6c 121 }
lo 26:271d2d510f6c 122 //printf("Byte in 0x%02x\n", answer);
lo 26:271d2d510f6c 123 return answer;
lo 26:271d2d510f6c 124 }
lo 26:271d2d510f6c 125 bool unassignedProbe(PinName pin) {
lo 26:271d2d510f6c 126 DigitalInOut _pin(pin);
lo 26:271d2d510f6c 127 ONEWIRE_INIT((&_pin));
lo 26:271d2d510f6c 128 INIT_DELAY;
lo 26:271d2d510f6c 129 char ROM_address[8];
lo 26:271d2d510f6c 130 return search_ROM_routine(&_pin, 0xF0, ROM_address);
lo 26:271d2d510f6c 131 }
lo 26:271d2d510f6c 132 bool unassignedProbe(DigitalInOut *pin, char *ROM_address) {
lo 26:271d2d510f6c 133 return search_ROM_routine(pin, 0xF0, ROM_address);
lo 26:271d2d510f6c 134 }
lo 26:271d2d510f6c 135 bool search_ROM_routine(DigitalInOut *pin, char command, char *ROM_address) {
lo 26:271d2d510f6c 136 bool DS1820_done_flag = false;
lo 26:271d2d510f6c 137 int DS1820_last_descrepancy = 0;
lo 26:271d2d510f6c 138 char DS1820_search_ROM[8] = {0, 0, 0, 0, 0, 0, 0, 0};
lo 26:271d2d510f6c 139
lo 26:271d2d510f6c 140 int descrepancy_marker, ROM_bit_index;
lo 26:271d2d510f6c 141 bool return_value, Bit_A, Bit_B;
lo 26:271d2d510f6c 142 char byte_counter, bit_mask;
lo 26:271d2d510f6c 143
lo 26:271d2d510f6c 144 return_value=false;
lo 26:271d2d510f6c 145 while (!DS1820_done_flag) {
lo 26:271d2d510f6c 146 if (!onewire_reset(pin)) {
lo 26:271d2d510f6c 147 return false;
lo 26:271d2d510f6c 148 } else {
lo 26:271d2d510f6c 149 ROM_bit_index=1;
lo 26:271d2d510f6c 150 descrepancy_marker=0;
lo 26:271d2d510f6c 151 char command_shift = command;
lo 26:271d2d510f6c 152 for (int n=0; n<8; n++) { // Search ROM command or Search Alarm command
lo 26:271d2d510f6c 153 onewire_bit_out(pin, command_shift & 0x01);
lo 26:271d2d510f6c 154 command_shift = command_shift >> 1; // now the next bit is in the least sig bit position.
lo 26:271d2d510f6c 155 }
lo 26:271d2d510f6c 156 byte_counter = 0;
lo 26:271d2d510f6c 157 bit_mask = 0x01;
lo 26:271d2d510f6c 158 while (ROM_bit_index<=64) {
lo 26:271d2d510f6c 159 Bit_A = onewire_bit_in(pin);
lo 26:271d2d510f6c 160 Bit_B = onewire_bit_in(pin);
lo 26:271d2d510f6c 161 if (Bit_A & Bit_B) {
lo 26:271d2d510f6c 162 descrepancy_marker = 0; // data read error, this should never happen
lo 26:271d2d510f6c 163 ROM_bit_index = 0xFF;
lo 26:271d2d510f6c 164 } else {
lo 26:271d2d510f6c 165 if (Bit_A | Bit_B) {
lo 26:271d2d510f6c 166 // Set ROM bit to Bit_A
lo 26:271d2d510f6c 167 if (Bit_A) {
lo 26:271d2d510f6c 168 DS1820_search_ROM[byte_counter] = DS1820_search_ROM[byte_counter] | bit_mask; // Set ROM bit to one
lo 26:271d2d510f6c 169 } else {
lo 26:271d2d510f6c 170 DS1820_search_ROM[byte_counter] = DS1820_search_ROM[byte_counter] & ~bit_mask; // Set ROM bit to zero
lo 26:271d2d510f6c 171 }
lo 26:271d2d510f6c 172 } else {
lo 26:271d2d510f6c 173 // both bits A and B are low, so there are two or more devices present
lo 26:271d2d510f6c 174 if ( ROM_bit_index == DS1820_last_descrepancy ) {
lo 26:271d2d510f6c 175 DS1820_search_ROM[byte_counter] = DS1820_search_ROM[byte_counter] | bit_mask; // Set ROM bit to one
lo 26:271d2d510f6c 176 } else {
lo 26:271d2d510f6c 177 if ( ROM_bit_index > DS1820_last_descrepancy ) {
lo 26:271d2d510f6c 178 DS1820_search_ROM[byte_counter] = DS1820_search_ROM[byte_counter] & ~bit_mask; // Set ROM bit to zero
lo 26:271d2d510f6c 179 descrepancy_marker = ROM_bit_index;
lo 26:271d2d510f6c 180 } else {
lo 26:271d2d510f6c 181 if (( DS1820_search_ROM[byte_counter] & bit_mask) == 0x00 )
lo 26:271d2d510f6c 182 descrepancy_marker = ROM_bit_index;
lo 26:271d2d510f6c 183 }
lo 26:271d2d510f6c 184 }
lo 26:271d2d510f6c 185 }
lo 26:271d2d510f6c 186 onewire_bit_out (pin, DS1820_search_ROM[byte_counter] & bit_mask);
lo 26:271d2d510f6c 187 ROM_bit_index++;
lo 26:271d2d510f6c 188 if (bit_mask & 0x80) {
lo 26:271d2d510f6c 189 byte_counter++;
lo 26:271d2d510f6c 190 bit_mask = 0x01;
lo 26:271d2d510f6c 191 } else {
lo 26:271d2d510f6c 192 bit_mask = bit_mask << 1;
lo 26:271d2d510f6c 193 }
lo 26:271d2d510f6c 194 }
lo 26:271d2d510f6c 195 }
lo 26:271d2d510f6c 196 DS1820_last_descrepancy = descrepancy_marker;
lo 26:271d2d510f6c 197 if (ROM_bit_index != 0xFF) {
lo 26:271d2d510f6c 198 int i = 1;
lo 26:271d2d510f6c 199 node *list_container;
lo 26:271d2d510f6c 200 while(1) {
lo 26:271d2d510f6c 201 list_container = probes.pop(i);
lo 26:271d2d510f6c 202 if (list_container == NULL) { //End of list, or empty list
lo 26:271d2d510f6c 203 if (ROM_checksum_error(DS1820_search_ROM)) { // Check the CRC
lo 26:271d2d510f6c 204 return false;
lo 26:271d2d510f6c 205 }
lo 26:271d2d510f6c 206 for(byte_counter=0;byte_counter<8;byte_counter++)
lo 26:271d2d510f6c 207 ROM_address[byte_counter] = DS1820_search_ROM[byte_counter];
lo 26:271d2d510f6c 208 return true;
lo 26:271d2d510f6c 209 } else { //Otherwise, check if ROM is already known
lo 26:271d2d510f6c 210 bool equal = true;
lo 26:271d2d510f6c 211 ds18b20_component *pointer = (ds18b20_component*) list_container->data;
lo 26:271d2d510f6c 212 char *ROM_compare = pointer->_ROM;
lo 26:271d2d510f6c 213
lo 26:271d2d510f6c 214 for(byte_counter=0;byte_counter<8;byte_counter++) {
lo 26:271d2d510f6c 215 if ( ROM_compare[byte_counter] != DS1820_search_ROM[byte_counter])
lo 26:271d2d510f6c 216 equal = false;
lo 26:271d2d510f6c 217 }
lo 26:271d2d510f6c 218 if (equal)
lo 26:271d2d510f6c 219 break;
lo 26:271d2d510f6c 220 else
lo 26:271d2d510f6c 221 i++;
lo 26:271d2d510f6c 222 }
lo 26:271d2d510f6c 223 }
lo 26:271d2d510f6c 224 }
lo 26:271d2d510f6c 225 }
lo 26:271d2d510f6c 226 if (DS1820_last_descrepancy == 0)
lo 26:271d2d510f6c 227 DS1820_done_flag = true;
lo 26:271d2d510f6c 228 }
lo 26:271d2d510f6c 229 return return_value;
lo 26:271d2d510f6c 230 }
lo 26:271d2d510f6c 231 void match_ROM() {
lo 26:271d2d510f6c 232 // Used to select a specific device
lo 26:271d2d510f6c 233 int i;
lo 26:271d2d510f6c 234 onewire_reset(&this->_datapin);
lo 26:271d2d510f6c 235 onewire_byte_out( 0x55); //Match ROM command
lo 26:271d2d510f6c 236 for (i=0;i<8;i++) {
lo 26:271d2d510f6c 237 onewire_byte_out(_ROM[i]);
lo 26:271d2d510f6c 238 }
lo 26:271d2d510f6c 239 }
lo 26:271d2d510f6c 240 void skip_ROM() {
lo 26:271d2d510f6c 241 onewire_reset(&this->_datapin);
lo 26:271d2d510f6c 242 onewire_byte_out(0xCC); // Skip ROM command
lo 26:271d2d510f6c 243 }
lo 26:271d2d510f6c 244 bool ROM_checksum_error(char *_ROM_address) {
lo 26:271d2d510f6c 245 char _CRC=0x00;
lo 26:271d2d510f6c 246 int i;
lo 26:271d2d510f6c 247 for(i=0;i<7;i++) // Only going to shift the lower 7 bytes
lo 26:271d2d510f6c 248 _CRC = CRC_byte(_CRC, _ROM_address[i]);
lo 26:271d2d510f6c 249 // After 7 bytes CRC should equal the 8th byte (ROM CRC)
lo 26:271d2d510f6c 250 return (_CRC!=_ROM_address[7]); // will return true if there is a CRC checksum mis-match
lo 26:271d2d510f6c 251 }
lo 26:271d2d510f6c 252 bool RAM_checksum_error() {
lo 26:271d2d510f6c 253 char _CRC=0x00;
lo 26:271d2d510f6c 254 int i;
lo 26:271d2d510f6c 255 for(i=0;i<8;i++) // Only going to shift the lower 8 bytes
lo 26:271d2d510f6c 256 _CRC = CRC_byte(_CRC, RAM[i]);
lo 26:271d2d510f6c 257 // After 8 bytes CRC should equal the 9th byte (RAM CRC)
lo 26:271d2d510f6c 258 return (_CRC!=RAM[8]); // will return true if there is a CRC checksum mis-match
lo 26:271d2d510f6c 259 }
lo 26:271d2d510f6c 260 char CRC_byte (char _CRC, char byte ) {
lo 26:271d2d510f6c 261 int j;
lo 26:271d2d510f6c 262 for(j=0;j<8;j++) {
lo 26:271d2d510f6c 263 if ((byte & 0x01 ) ^ (_CRC & 0x01)) {
lo 26:271d2d510f6c 264 // DATA ^ LSB CRC = 1
lo 26:271d2d510f6c 265 _CRC = _CRC>>1;
lo 26:271d2d510f6c 266 // Set the MSB to 1
lo 26:271d2d510f6c 267 _CRC = _CRC | 0x80;
lo 26:271d2d510f6c 268 // Check bit 3
lo 26:271d2d510f6c 269 if (_CRC & 0x04) {
lo 26:271d2d510f6c 270 _CRC = _CRC & 0xFB; // Bit 3 is set, so clear it
lo 26:271d2d510f6c 271 } else {
lo 26:271d2d510f6c 272 _CRC = _CRC | 0x04; // Bit 3 is clear, so set it
lo 26:271d2d510f6c 273 }
lo 26:271d2d510f6c 274 // Check bit 4
lo 26:271d2d510f6c 275 if (_CRC & 0x08) {
lo 26:271d2d510f6c 276 _CRC = _CRC & 0xF7; // Bit 4 is set, so clear it
lo 26:271d2d510f6c 277 } else {
lo 26:271d2d510f6c 278 _CRC = _CRC | 0x08; // Bit 4 is clear, so set it
lo 26:271d2d510f6c 279 }
lo 26:271d2d510f6c 280 } else {
lo 26:271d2d510f6c 281 // DATA ^ LSB CRC = 0
lo 26:271d2d510f6c 282 _CRC = _CRC>>1;
lo 26:271d2d510f6c 283 // clear MSB
lo 26:271d2d510f6c 284 _CRC = _CRC & 0x7F;
lo 26:271d2d510f6c 285 // No need to check bits, with DATA ^ LSB CRC = 0, they will remain unchanged
lo 26:271d2d510f6c 286 }
lo 26:271d2d510f6c 287 byte = byte>>1;
lo 26:271d2d510f6c 288 }
lo 26:271d2d510f6c 289 return _CRC;
lo 26:271d2d510f6c 290 }
lo 26:271d2d510f6c 291 int convertTemperature(bool wait, devices device) {
lo 26:271d2d510f6c 292 // Convert temperature into scratchpad RAM for all devices at once
lo 26:271d2d510f6c 293 int delay_time = 750; // Default delay time
lo 26:271d2d510f6c 294 char resolution;
lo 26:271d2d510f6c 295 if (device==all_devices)
lo 26:271d2d510f6c 296 skip_ROM(); // Skip ROM command, will convert for ALL devices
lo 26:271d2d510f6c 297 else {
lo 26:271d2d510f6c 298 match_ROM();
lo 26:271d2d510f6c 299 if ((FAMILY_CODE == FAMILY_CODE_DS18B20 ) || (FAMILY_CODE == FAMILY_CODE_DS1822 )) {
lo 26:271d2d510f6c 300 resolution = RAM[4] & 0x60;
lo 26:271d2d510f6c 301 if (resolution == 0x00) // 9 bits
lo 26:271d2d510f6c 302 delay_time = 94;
lo 26:271d2d510f6c 303 if (resolution == 0x20) // 10 bits
lo 26:271d2d510f6c 304 delay_time = 188;
lo 26:271d2d510f6c 305 if (resolution == 0x40) // 11 bits. Note 12bits uses the 750ms default
lo 26:271d2d510f6c 306 delay_time = 375;
lo 26:271d2d510f6c 307 }
lo 26:271d2d510f6c 308 }
lo 26:271d2d510f6c 309
lo 26:271d2d510f6c 310 onewire_byte_out( 0x44); // perform temperature conversion
lo 26:271d2d510f6c 311 if (_parasite_power) {
lo 26:271d2d510f6c 312 if (_power_mosfet) {
lo 26:271d2d510f6c 313 _parasitepin = _power_polarity; // Parasite power strong pullup
lo 26:271d2d510f6c 314 wait_ms(delay_time);
lo 26:271d2d510f6c 315 _parasitepin = !_power_polarity;
lo 26:271d2d510f6c 316 delay_time = 0;
lo 26:271d2d510f6c 317 } else {
lo 26:271d2d510f6c 318 _datapin.output();
lo 26:271d2d510f6c 319 _datapin.write(1);
lo 26:271d2d510f6c 320 wait_ms(delay_time);
lo 26:271d2d510f6c 321 _datapin.input();
lo 26:271d2d510f6c 322 }
lo 26:271d2d510f6c 323 } else {
lo 26:271d2d510f6c 324 if (wait) {
lo 26:271d2d510f6c 325 wait_ms(delay_time);
lo 26:271d2d510f6c 326 delay_time = 0;
lo 26:271d2d510f6c 327 }
lo 26:271d2d510f6c 328 }
lo 26:271d2d510f6c 329 return delay_time;
lo 26:271d2d510f6c 330 }
lo 26:271d2d510f6c 331 void read_RAM() {
lo 26:271d2d510f6c 332 // This will copy the DS18B20_component's 9 bytes of RAM data
lo 26:271d2d510f6c 333 // into the objects RAM array. Functions that use
lo 26:271d2d510f6c 334 // RAM values will automaticly call this procedure.
lo 26:271d2d510f6c 335 int i;
lo 26:271d2d510f6c 336 match_ROM(); // Select this device
lo 26:271d2d510f6c 337 onewire_byte_out( 0xBE); //Read Scratchpad command
lo 26:271d2d510f6c 338 for(i=0;i<9;i++) {
lo 26:271d2d510f6c 339 RAM[i] = onewire_byte_in();
lo 26:271d2d510f6c 340 }
lo 26:271d2d510f6c 341 // if (!RAM_checksum_error())
lo 26:271d2d510f6c 342 // crcerr = 1;
lo 26:271d2d510f6c 343 }
lo 26:271d2d510f6c 344 bool setResolution(unsigned int resolution) {
lo 26:271d2d510f6c 345 bool answer = false;
lo 26:271d2d510f6c 346 resolution = resolution - 9;
lo 26:271d2d510f6c 347 if (resolution < 4) {
lo 26:271d2d510f6c 348 resolution = resolution<<5; // align the bits
lo 26:271d2d510f6c 349 RAM[4] = (RAM[4] & 0x60) | resolution; // mask out old data, insert new
lo 26:271d2d510f6c 350 write_scratchpad ((RAM[2]<<8) + RAM[3]);
lo 26:271d2d510f6c 351 // store_scratchpad (DS18B20_component::this_device); // Need to test if this is required
lo 26:271d2d510f6c 352 answer = true;
lo 26:271d2d510f6c 353 }
lo 26:271d2d510f6c 354 return answer;
lo 26:271d2d510f6c 355 }
lo 26:271d2d510f6c 356 void write_scratchpad(int data) {
lo 26:271d2d510f6c 357 RAM[3] = data;
lo 26:271d2d510f6c 358 RAM[2] = data>>8;
lo 26:271d2d510f6c 359 match_ROM();
lo 26:271d2d510f6c 360 onewire_byte_out(0x4E); // Copy scratchpad into DS18B20_component ram memory
lo 26:271d2d510f6c 361 onewire_byte_out(RAM[2]); // T(H)
lo 26:271d2d510f6c 362 onewire_byte_out(RAM[3]); // T(L)
lo 26:271d2d510f6c 363 if ((FAMILY_CODE == FAMILY_CODE_DS18B20 ) || (FAMILY_CODE == FAMILY_CODE_DS1822 )) {
lo 26:271d2d510f6c 364 onewire_byte_out(RAM[4]); // Configuration register
lo 26:271d2d510f6c 365 }
lo 26:271d2d510f6c 366 }
lo 26:271d2d510f6c 367 float temperature(char scale) {
lo 26:271d2d510f6c 368 // The data specs state that count_per_degree should be 0x10 (16), I found my devices
lo 26:271d2d510f6c 369 // to have a count_per_degree of 0x4B (75). With the standard resolution of 1/2 deg C
lo 26:271d2d510f6c 370 // this allowed an expanded resolution of 1/150th of a deg C. I wouldn't rely on this
lo 26:271d2d510f6c 371 // being super acurate, but it does allow for a smooth display in the 1/10ths of a
lo 26:271d2d510f6c 372 // deg C or F scales.
lo 26:271d2d510f6c 373 float answer, remaining_count, count_per_degree;
lo 26:271d2d510f6c 374 int reading;
lo 26:271d2d510f6c 375 read_RAM();
lo 26:271d2d510f6c 376 if (RAM_checksum_error())
lo 26:271d2d510f6c 377 // Indicate we got a CRC error
lo 26:271d2d510f6c 378 answer = invalid_conversion;
lo 26:271d2d510f6c 379 else
lo 26:271d2d510f6c 380 {
lo 26:271d2d510f6c 381 reading = (RAM[1] << 8) + RAM[0];
lo 26:271d2d510f6c 382 if (reading & 0x8000) { // negative degrees C
lo 26:271d2d510f6c 383 reading = 0-((reading ^ 0xffff) + 1); // 2's comp then convert to signed int
lo 26:271d2d510f6c 384 }
lo 26:271d2d510f6c 385 answer = reading +0.0; // convert to floating point
lo 26:271d2d510f6c 386 if ((FAMILY_CODE == FAMILY_CODE_DS18B20 ) || (FAMILY_CODE == FAMILY_CODE_DS1822 )) {
lo 26:271d2d510f6c 387 answer = answer / 16.0f;
lo 26:271d2d510f6c 388 }
lo 26:271d2d510f6c 389 else {
lo 26:271d2d510f6c 390 remaining_count = RAM[6];
lo 26:271d2d510f6c 391 count_per_degree = RAM[7];
lo 26:271d2d510f6c 392 answer = floor(answer/2.0f) - 0.25f + (count_per_degree - remaining_count) / count_per_degree;
lo 26:271d2d510f6c 393 }
lo 26:271d2d510f6c 394 if (scale=='F' or scale=='f')
lo 26:271d2d510f6c 395 // Convert to deg F
lo 26:271d2d510f6c 396 answer = answer * 9.0f / 5.0f + 32.0f;
lo 26:271d2d510f6c 397 }
lo 26:271d2d510f6c 398 return answer;
lo 26:271d2d510f6c 399 }
lo 26:271d2d510f6c 400 bool read_power_supply(devices device) {
lo 26:271d2d510f6c 401 // This will return true if the device (or all devices) are Vcc powered
lo 26:271d2d510f6c 402 // This will return false if the device (or ANY device) is parasite powered
lo 26:271d2d510f6c 403 if (device==all_devices)
lo 26:271d2d510f6c 404 skip_ROM(); // Skip ROM command, will poll for any device using parasite power
lo 26:271d2d510f6c 405 else
lo 26:271d2d510f6c 406 match_ROM();
lo 26:271d2d510f6c 407 onewire_byte_out(0xB4); // Read power supply command
lo 26:271d2d510f6c 408 return onewire_bit_in(&this->_datapin);
lo 26:271d2d510f6c 409 }
lo 26:271d2d510f6c 410
lo 26:271d2d510f6c 411 private:
lo 26:271d2d510f6c 412 bool _parasite_power;
lo 26:271d2d510f6c 413 bool _power_mosfet;
lo 26:271d2d510f6c 414 bool _power_polarity;
lo 26:271d2d510f6c 415 char _ROM[8],RAM[9];
lo 26:271d2d510f6c 416 DigitalInOut _datapin;
lo 26:271d2d510f6c 417 DigitalOut _parasitepin;
lo 26:271d2d510f6c 418 static LinkedList<node> probes;
lo 26:271d2d510f6c 419
lo 26:271d2d510f6c 420 class ds18b20_temperature : public Service{
lo 26:271d2d510f6c 421
lo 26:271d2d510f6c 422 public:
lo 26:271d2d510f6c 423 ds18b20_temperature(
lo 26:271d2d510f6c 424 DEVICE_TYPE type,
lo 26:271d2d510f6c 425 MISNET_CODE misnet_code,
lo 26:271d2d510f6c 426 STATE state,
lo 26:271d2d510f6c 427 ACCESS_TYPE access_type,
lo 26:271d2d510f6c 428 REQUEST_MODE request_mode,
lo 26:271d2d510f6c 429 UP_MODE up_mode,
lo 26:271d2d510f6c 430 ACCESS_PIN access_pins[6],
lo 26:271d2d510f6c 431 uint32_t subsample_rate,
lo 26:271d2d510f6c 432 ACTION action,
lo 26:271d2d510f6c 433 OUTPUT_MODE output_mode,
lo 26:271d2d510f6c 434 string comment,
lo 26:271d2d510f6c 435 ds18b20_temperature* parent
lo 26:271d2d510f6c 436 )
lo 26:271d2d510f6c 437 {
lo 26:271d2d510f6c 438 this->parent = parent;
lo 26:271d2d510f6c 439 this->setDeviceType(type);
lo 26:271d2d510f6c 440 this->setMisnetCode(misnet_code);
lo 26:271d2d510f6c 441 this->setState(state);
lo 26:271d2d510f6c 442 this->setAccessType(access_type);
lo 26:271d2d510f6c 443 this->setRequestMode(request_mode);
lo 26:271d2d510f6c 444 this->setUpMode(up_mode);
lo 26:271d2d510f6c 445 this->setAction(action);
lo 26:271d2d510f6c 446 this->setOutputMode(output_mode);
lo 26:271d2d510f6c 447 this->setComment(comment);
lo 26:271d2d510f6c 448 this->setSubsampleRate(subsample_rate);
lo 26:271d2d510f6c 449 }
lo 26:271d2d510f6c 450 virtual ~ds18b20_temperature() {}
lo 26:271d2d510f6c 451 float readValue(void) {
lo 26:271d2d510f6c 452 // TODO : the call is blocking
lo 26:271d2d510f6c 453 parent->convertTemperature(true, this_device);
lo 26:271d2d510f6c 454 return parent->temperature('c');
lo 26:271d2d510f6c 455 }
lo 26:271d2d510f6c 456
lo 26:271d2d510f6c 457 private:
lo 26:271d2d510f6c 458 ds18b20_component *parent;
lo 26:271d2d510f6c 459 };
lo 26:271d2d510f6c 460 };
lo 26:271d2d510f6c 461
lo 26:271d2d510f6c 462 #endif /* DS18B20_COMPONENT_HPP_ */
lo 26:271d2d510f6c 463