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@31:2b8b98f3feed, 2018-10-03 (annotated)

Committer:
lo
Date:
Wed Oct 03 17:22:58 2018 +0000
Revision:
31:2b8b98f3feed
Parent:
26:271d2d510f6c
Child:
32:3bef9b81f639
completed component methods

Who changed what in which revision?

UserRevisionLine numberNew contents of line
lo 31:2b8b98f3feed 1 /*
lo 31:2b8b98f3feed 2 * DS18B20.hpp
lo 31:2b8b98f3feed 3 *
lo 31:2b8b98f3feed 4 * Created on: 18 sept. 2018
lo 31:2b8b98f3feed 5 * Author: hoel
lo 31:2b8b98f3feed 6 */
lo 31:2b8b98f3feed 7
lo 31:2b8b98f3feed 8 #ifndef DS18B20_COMPONENT_HPP_
lo 31:2b8b98f3feed 9 #define DS18B20_COMPONENT_HPP_
lo 31:2b8b98f3feed 10
lo 31:2b8b98f3feed 11 #include <iostream>
lo 31:2b8b98f3feed 12 #include <cstdlib>
lo 31:2b8b98f3feed 13 #include "mbed.h"
lo 31:2b8b98f3feed 14 #include "Context.h"
lo 31:2b8b98f3feed 15 #include "Service.hpp"
lo 31:2b8b98f3feed 16 #include "Component.hpp"
lo 31:2b8b98f3feed 17 #include "LinkedList.h"
lo 31:2b8b98f3feed 18
lo 31:2b8b98f3feed 19 using namespace std;
lo 31:2b8b98f3feed 20 using namespace misnet;
lo 31:2b8b98f3feed 21
lo 31:2b8b98f3feed 22 #define FAMILY_CODE _ROM[0]
lo 31:2b8b98f3feed 23 #define FAMILY_CODE_DS1820 0x10
lo 31:2b8b98f3feed 24 #define FAMILY_CODE_DS18B20 0x28
lo 31:2b8b98f3feed 25 #define FAMILY_CODE_DS1822 0x22
lo 31:2b8b98f3feed 26 #define ONEWIRE_INPUT(pin) pin->input()
lo 31:2b8b98f3feed 27 #define ONEWIRE_OUTPUT(pin) pin->output()
lo 31:2b8b98f3feed 28 #define ONEWIRE_INIT(pin)
lo 31:2b8b98f3feed 29 #define INIT_DELAY
lo 31:2b8b98f3feed 30 #define ONEWIRE_DELAY_US(value) wait_us(value)
lo 31:2b8b98f3feed 31
lo 31:2b8b98f3feed 32 class ds18b20_component : public Component{
lo 31:2b8b98f3feed 33
lo 31:2b8b98f3feed 34 public:
lo 31:2b8b98f3feed 35 enum devices{
lo 31:2b8b98f3feed 36 this_device, // command applies to only this device
lo 31:2b8b98f3feed 37 all_devices }; // command applies to all devices
lo 31:2b8b98f3feed 38 enum { invalid_conversion = -1000 };
lo 31:2b8b98f3feed 39 ds18b20_component (COMPONENT_ID id, vector<Service*>& services, PinName data_pin, PinName power_pin, bool power_polarity) :
lo 31:2b8b98f3feed 40 _datapin(data_pin),
lo 31:2b8b98f3feed 41 _parasitepin(power_pin)
lo 31:2b8b98f3feed 42 {
lo 31:2b8b98f3feed 43 this->setServices(services);
lo 31:2b8b98f3feed 44 this->setId(id);
lo 31:2b8b98f3feed 45 if(power_pin) _parasite_power = true;
lo 31:2b8b98f3feed 46 _power_polarity = power_polarity;
lo 31:2b8b98f3feed 47 _power_mosfet = power_pin != NC;
lo 31:2b8b98f3feed 48 }
lo 31:2b8b98f3feed 49 ~ds18b20_component();
lo 31:2b8b98f3feed 50 void init(void){
lo 31:2b8b98f3feed 51
lo 31:2b8b98f3feed 52 int byte_counter;
lo 31:2b8b98f3feed 53 for(byte_counter=0;byte_counter<9;byte_counter++)
lo 31:2b8b98f3feed 54 RAM[byte_counter] = 0x00;
lo 31:2b8b98f3feed 55
lo 31:2b8b98f3feed 56 ONEWIRE_INIT((&_datapin));
lo 31:2b8b98f3feed 57 INIT_DELAY;
lo 31:2b8b98f3feed 58
lo 31:2b8b98f3feed 59 if (!unassignedProbe(&_datapin, _ROM))
lo 31:2b8b98f3feed 60 error("No unassigned DS18B20_component found!\n");
lo 31:2b8b98f3feed 61 else {
lo 31:2b8b98f3feed 62 _datapin.input();
lo 31:2b8b98f3feed 63 probes.append(this);
lo 31:2b8b98f3feed 64 _parasite_power = !read_power_supply(devices::this_device);
lo 31:2b8b98f3feed 65 }
lo 31:2b8b98f3feed 66 }
lo 31:2b8b98f3feed 67 bool onewire_reset(DigitalInOut *pin) {
lo 31:2b8b98f3feed 68 // This will return false if no devices are present on the data bus
lo 31:2b8b98f3feed 69 bool presence=false;
lo 31:2b8b98f3feed 70 ONEWIRE_OUTPUT(pin);
lo 31:2b8b98f3feed 71 pin->write(0); // bring low for 500 us
lo 31:2b8b98f3feed 72 ONEWIRE_DELAY_US(500);
lo 31:2b8b98f3feed 73 ONEWIRE_INPUT(pin); // let the data line float high
lo 31:2b8b98f3feed 74 ONEWIRE_DELAY_US(90); // wait 90us
lo 31:2b8b98f3feed 75 if (pin->read()==0) // see if any devices are pulling the data line low
lo 31:2b8b98f3feed 76 presence=true;
lo 31:2b8b98f3feed 77 ONEWIRE_DELAY_US(410);
lo 31:2b8b98f3feed 78 return presence;
lo 31:2b8b98f3feed 79 }
lo 31:2b8b98f3feed 80 void onewire_bit_out (DigitalInOut *pin, bool bit_data) {
lo 31:2b8b98f3feed 81 ONEWIRE_OUTPUT(pin);
lo 31:2b8b98f3feed 82 pin->write(0);
lo 31:2b8b98f3feed 83 ONEWIRE_DELAY_US(3); // DXP modified from 5
lo 31:2b8b98f3feed 84 if (bit_data) {
lo 31:2b8b98f3feed 85 pin->write(1); // bring data line high
lo 31:2b8b98f3feed 86 ONEWIRE_DELAY_US(55);
lo 31:2b8b98f3feed 87 } else {
lo 31:2b8b98f3feed 88 ONEWIRE_DELAY_US(55); // keep data line low
lo 31:2b8b98f3feed 89 pin->write(1);
lo 31:2b8b98f3feed 90 ONEWIRE_DELAY_US(10); // DXP added to allow bus to float high before next bit_out
lo 31:2b8b98f3feed 91 }
lo 31:2b8b98f3feed 92
lo 31:2b8b98f3feed 93 }
lo 31:2b8b98f3feed 94 void onewire_byte_out(char data) { // output data character (least sig bit first).
lo 31:2b8b98f3feed 95 int n;
lo 31:2b8b98f3feed 96 //printf("Byte out 0x%02x\n", data);
lo 31:2b8b98f3feed 97 for (n=0; n<8; n++) {
lo 31:2b8b98f3feed 98 onewire_bit_out(&this->_datapin, data & 0x01);
lo 31:2b8b98f3feed 99 data = data >> 1; // now the next bit is in the least sig bit position.
lo 31:2b8b98f3feed 100 }
lo 31:2b8b98f3feed 101
lo 31:2b8b98f3feed 102 }
lo 31:2b8b98f3feed 103 bool onewire_bit_in(DigitalInOut *pin) {
lo 31:2b8b98f3feed 104 bool answer;
lo 31:2b8b98f3feed 105 ONEWIRE_OUTPUT(pin);
lo 31:2b8b98f3feed 106 pin->write(0);
lo 31:2b8b98f3feed 107 ONEWIRE_DELAY_US(3); // DXP modofied from 5
lo 31:2b8b98f3feed 108 ONEWIRE_INPUT(pin);
lo 31:2b8b98f3feed 109 ONEWIRE_DELAY_US(10); // DXP modified from 5
lo 31:2b8b98f3feed 110 answer = pin->read();
lo 31:2b8b98f3feed 111 ONEWIRE_DELAY_US(45); // DXP modified from 50
lo 31:2b8b98f3feed 112 return answer;
lo 31:2b8b98f3feed 113 }
lo 31:2b8b98f3feed 114 char onewire_byte_in() { // read byte, least sig byte first
lo 31:2b8b98f3feed 115 char answer = 0x00;
lo 31:2b8b98f3feed 116 int i;
lo 31:2b8b98f3feed 117 for (i=0; i<8; i++) {
lo 31:2b8b98f3feed 118 answer = answer >> 1; // shift over to make room for the next bit
lo 31:2b8b98f3feed 119 if (onewire_bit_in(&this->_datapin))
lo 31:2b8b98f3feed 120 answer = answer | 0x80; // if the data port is high, make this bit a 1
lo 31:2b8b98f3feed 121 }
lo 31:2b8b98f3feed 122 //printf("Byte in 0x%02x\n", answer);
lo 31:2b8b98f3feed 123 return answer;
lo 31:2b8b98f3feed 124 }
lo 31:2b8b98f3feed 125 bool unassignedProbe(PinName pin) {
lo 31:2b8b98f3feed 126 DigitalInOut _pin(pin);
lo 31:2b8b98f3feed 127 ONEWIRE_INIT((&_pin));
lo 31:2b8b98f3feed 128 INIT_DELAY;
lo 31:2b8b98f3feed 129 char ROM_address[8];
lo 31:2b8b98f3feed 130 return search_ROM_routine(&_pin, 0xF0, ROM_address);
lo 31:2b8b98f3feed 131 }
lo 31:2b8b98f3feed 132 bool unassignedProbe(DigitalInOut *pin, char *ROM_address) {
lo 31:2b8b98f3feed 133 return search_ROM_routine(pin, 0xF0, ROM_address);
lo 31:2b8b98f3feed 134 }
lo 31:2b8b98f3feed 135 bool search_ROM_routine(DigitalInOut *pin, char command, char *ROM_address) {
lo 31:2b8b98f3feed 136 bool DS1820_done_flag = false;
lo 31:2b8b98f3feed 137 int DS1820_last_descrepancy = 0;
lo 31:2b8b98f3feed 138 char DS1820_search_ROM[8] = {0, 0, 0, 0, 0, 0, 0, 0};
lo 31:2b8b98f3feed 139
lo 31:2b8b98f3feed 140 int descrepancy_marker, ROM_bit_index;
lo 31:2b8b98f3feed 141 bool return_value, Bit_A, Bit_B;
lo 31:2b8b98f3feed 142 char byte_counter, bit_mask;
lo 31:2b8b98f3feed 143
lo 31:2b8b98f3feed 144 return_value=false;
lo 31:2b8b98f3feed 145 while (!DS1820_done_flag) {
lo 31:2b8b98f3feed 146 if (!onewire_reset(pin)) {
lo 31:2b8b98f3feed 147 return false;
lo 31:2b8b98f3feed 148 } else {
lo 31:2b8b98f3feed 149 ROM_bit_index=1;
lo 31:2b8b98f3feed 150 descrepancy_marker=0;
lo 31:2b8b98f3feed 151 char command_shift = command;
lo 31:2b8b98f3feed 152 for (int n=0; n<8; n++) { // Search ROM command or Search Alarm command
lo 31:2b8b98f3feed 153 onewire_bit_out(pin, command_shift & 0x01);
lo 31:2b8b98f3feed 154 command_shift = command_shift >> 1; // now the next bit is in the least sig bit position.
lo 31:2b8b98f3feed 155 }
lo 31:2b8b98f3feed 156 byte_counter = 0;
lo 31:2b8b98f3feed 157 bit_mask = 0x01;
lo 31:2b8b98f3feed 158 while (ROM_bit_index<=64) {
lo 31:2b8b98f3feed 159 Bit_A = onewire_bit_in(pin);
lo 31:2b8b98f3feed 160 Bit_B = onewire_bit_in(pin);
lo 31:2b8b98f3feed 161 if (Bit_A & Bit_B) {
lo 31:2b8b98f3feed 162 descrepancy_marker = 0; // data read error, this should never happen
lo 31:2b8b98f3feed 163 ROM_bit_index = 0xFF;
lo 31:2b8b98f3feed 164 } else {
lo 31:2b8b98f3feed 165 if (Bit_A | Bit_B) {
lo 31:2b8b98f3feed 166 // Set ROM bit to Bit_A
lo 31:2b8b98f3feed 167 if (Bit_A) {
lo 31:2b8b98f3feed 168 DS1820_search_ROM[byte_counter] = DS1820_search_ROM[byte_counter] | bit_mask; // Set ROM bit to one
lo 31:2b8b98f3feed 169 } else {
lo 31:2b8b98f3feed 170 DS1820_search_ROM[byte_counter] = DS1820_search_ROM[byte_counter] & ~bit_mask; // Set ROM bit to zero
lo 31:2b8b98f3feed 171 }
lo 31:2b8b98f3feed 172 } else {
lo 31:2b8b98f3feed 173 // both bits A and B are low, so there are two or more devices present
lo 31:2b8b98f3feed 174 if ( ROM_bit_index == DS1820_last_descrepancy ) {
lo 31:2b8b98f3feed 175 DS1820_search_ROM[byte_counter] = DS1820_search_ROM[byte_counter] | bit_mask; // Set ROM bit to one
lo 31:2b8b98f3feed 176 } else {
lo 31:2b8b98f3feed 177 if ( ROM_bit_index > DS1820_last_descrepancy ) {
lo 31:2b8b98f3feed 178 DS1820_search_ROM[byte_counter] = DS1820_search_ROM[byte_counter] & ~bit_mask; // Set ROM bit to zero
lo 31:2b8b98f3feed 179 descrepancy_marker = ROM_bit_index;
lo 31:2b8b98f3feed 180 } else {
lo 31:2b8b98f3feed 181 if (( DS1820_search_ROM[byte_counter] & bit_mask) == 0x00 )
lo 31:2b8b98f3feed 182 descrepancy_marker = ROM_bit_index;
lo 31:2b8b98f3feed 183 }
lo 31:2b8b98f3feed 184 }
lo 31:2b8b98f3feed 185 }
lo 31:2b8b98f3feed 186 onewire_bit_out (pin, DS1820_search_ROM[byte_counter] & bit_mask);
lo 31:2b8b98f3feed 187 ROM_bit_index++;
lo 31:2b8b98f3feed 188 if (bit_mask & 0x80) {
lo 31:2b8b98f3feed 189 byte_counter++;
lo 31:2b8b98f3feed 190 bit_mask = 0x01;
lo 31:2b8b98f3feed 191 } else {
lo 31:2b8b98f3feed 192 bit_mask = bit_mask << 1;
lo 31:2b8b98f3feed 193 }
lo 31:2b8b98f3feed 194 }
lo 31:2b8b98f3feed 195 }
lo 31:2b8b98f3feed 196 DS1820_last_descrepancy = descrepancy_marker;
lo 31:2b8b98f3feed 197 if (ROM_bit_index != 0xFF) {
lo 31:2b8b98f3feed 198 int i = 1;
lo 31:2b8b98f3feed 199 node *list_container;
lo 31:2b8b98f3feed 200 while(1) {
lo 31:2b8b98f3feed 201 list_container = probes.pop(i);
lo 31:2b8b98f3feed 202 if (list_container == NULL) { //End of list, or empty list
lo 31:2b8b98f3feed 203 if (ROM_checksum_error(DS1820_search_ROM)) { // Check the CRC
lo 31:2b8b98f3feed 204 return false;
lo 31:2b8b98f3feed 205 }
lo 31:2b8b98f3feed 206 for(byte_counter=0;byte_counter<8;byte_counter++)
lo 31:2b8b98f3feed 207 ROM_address[byte_counter] = DS1820_search_ROM[byte_counter];
lo 31:2b8b98f3feed 208 return true;
lo 31:2b8b98f3feed 209 } else { //Otherwise, check if ROM is already known
lo 31:2b8b98f3feed 210 bool equal = true;
lo 31:2b8b98f3feed 211 ds18b20_component *pointer = (ds18b20_component*) list_container->data;
lo 31:2b8b98f3feed 212 char *ROM_compare = pointer->_ROM;
lo 26:271d2d510f6c 213
lo 31:2b8b98f3feed 214 for(byte_counter=0;byte_counter<8;byte_counter++) {
lo 31:2b8b98f3feed 215 if ( ROM_compare[byte_counter] != DS1820_search_ROM[byte_counter])
lo 31:2b8b98f3feed 216 equal = false;
lo 31:2b8b98f3feed 217 }
lo 31:2b8b98f3feed 218 if (equal)
lo 31:2b8b98f3feed 219 break;
lo 31:2b8b98f3feed 220 else
lo 31:2b8b98f3feed 221 i++;
lo 31:2b8b98f3feed 222 }
lo 31:2b8b98f3feed 223 }
lo 31:2b8b98f3feed 224 }
lo 31:2b8b98f3feed 225 }
lo 31:2b8b98f3feed 226 if (DS1820_last_descrepancy == 0)
lo 31:2b8b98f3feed 227 DS1820_done_flag = true;
lo 31:2b8b98f3feed 228 }
lo 31:2b8b98f3feed 229 return return_value;
lo 31:2b8b98f3feed 230 }
lo 31:2b8b98f3feed 231 void match_ROM() {
lo 31:2b8b98f3feed 232 // Used to select a specific device
lo 31:2b8b98f3feed 233 int i;
lo 31:2b8b98f3feed 234 onewire_reset(&this->_datapin);
lo 31:2b8b98f3feed 235 onewire_byte_out( 0x55); //Match ROM command
lo 31:2b8b98f3feed 236 for (i=0;i<8;i++) {
lo 31:2b8b98f3feed 237 onewire_byte_out(_ROM[i]);
lo 31:2b8b98f3feed 238 }
lo 31:2b8b98f3feed 239 }
lo 31:2b8b98f3feed 240 void skip_ROM() {
lo 31:2b8b98f3feed 241 onewire_reset(&this->_datapin);
lo 31:2b8b98f3feed 242 onewire_byte_out(0xCC); // Skip ROM command
lo 31:2b8b98f3feed 243 }
lo 31:2b8b98f3feed 244 bool ROM_checksum_error(char *_ROM_address) {
lo 31:2b8b98f3feed 245 char _CRC=0x00;
lo 31:2b8b98f3feed 246 int i;
lo 31:2b8b98f3feed 247 for(i=0;i<7;i++) // Only going to shift the lower 7 bytes
lo 31:2b8b98f3feed 248 _CRC = CRC_byte(_CRC, _ROM_address[i]);
lo 31:2b8b98f3feed 249 // After 7 bytes CRC should equal the 8th byte (ROM CRC)
lo 31:2b8b98f3feed 250 return (_CRC!=_ROM_address[7]); // will return true if there is a CRC checksum mis-match
lo 31:2b8b98f3feed 251 }
lo 31:2b8b98f3feed 252 bool RAM_checksum_error() {
lo 31:2b8b98f3feed 253 char _CRC=0x00;
lo 31:2b8b98f3feed 254 int i;
lo 31:2b8b98f3feed 255 for(i=0;i<8;i++) // Only going to shift the lower 8 bytes
lo 31:2b8b98f3feed 256 _CRC = CRC_byte(_CRC, RAM[i]);
lo 31:2b8b98f3feed 257 // After 8 bytes CRC should equal the 9th byte (RAM CRC)
lo 31:2b8b98f3feed 258 return (_CRC!=RAM[8]); // will return true if there is a CRC checksum mis-match
lo 31:2b8b98f3feed 259 }
lo 31:2b8b98f3feed 260 char CRC_byte (char _CRC, char byte ) {
lo 31:2b8b98f3feed 261 int j;
lo 31:2b8b98f3feed 262 for(j=0;j<8;j++) {
lo 31:2b8b98f3feed 263 if ((byte & 0x01 ) ^ (_CRC & 0x01)) {
lo 31:2b8b98f3feed 264 // DATA ^ LSB CRC = 1
lo 31:2b8b98f3feed 265 _CRC = _CRC>>1;
lo 31:2b8b98f3feed 266 // Set the MSB to 1
lo 31:2b8b98f3feed 267 _CRC = _CRC | 0x80;
lo 31:2b8b98f3feed 268 // Check bit 3
lo 31:2b8b98f3feed 269 if (_CRC & 0x04) {
lo 31:2b8b98f3feed 270 _CRC = _CRC & 0xFB; // Bit 3 is set, so clear it
lo 31:2b8b98f3feed 271 } else {
lo 31:2b8b98f3feed 272 _CRC = _CRC | 0x04; // Bit 3 is clear, so set it
lo 31:2b8b98f3feed 273 }
lo 31:2b8b98f3feed 274 // Check bit 4
lo 31:2b8b98f3feed 275 if (_CRC & 0x08) {
lo 31:2b8b98f3feed 276 _CRC = _CRC & 0xF7; // Bit 4 is set, so clear it
lo 31:2b8b98f3feed 277 } else {
lo 31:2b8b98f3feed 278 _CRC = _CRC | 0x08; // Bit 4 is clear, so set it
lo 31:2b8b98f3feed 279 }
lo 31:2b8b98f3feed 280 } else {
lo 31:2b8b98f3feed 281 // DATA ^ LSB CRC = 0
lo 31:2b8b98f3feed 282 _CRC = _CRC>>1;
lo 31:2b8b98f3feed 283 // clear MSB
lo 31:2b8b98f3feed 284 _CRC = _CRC & 0x7F;
lo 31:2b8b98f3feed 285 // No need to check bits, with DATA ^ LSB CRC = 0, they will remain unchanged
lo 31:2b8b98f3feed 286 }
lo 31:2b8b98f3feed 287 byte = byte>>1;
lo 31:2b8b98f3feed 288 }
lo 31:2b8b98f3feed 289 return _CRC;
lo 31:2b8b98f3feed 290 }
lo 31:2b8b98f3feed 291 int convertTemperature(bool wait, devices device) {
lo 31:2b8b98f3feed 292 // Convert temperature into scratchpad RAM for all devices at once
lo 31:2b8b98f3feed 293 int delay_time = 750; // Default delay time
lo 31:2b8b98f3feed 294 char resolution;
lo 31:2b8b98f3feed 295 if (device==all_devices)
lo 31:2b8b98f3feed 296 skip_ROM(); // Skip ROM command, will convert for ALL devices
lo 31:2b8b98f3feed 297 else {
lo 31:2b8b98f3feed 298 match_ROM();
lo 31:2b8b98f3feed 299 if ((FAMILY_CODE == FAMILY_CODE_DS18B20 ) || (FAMILY_CODE == FAMILY_CODE_DS1822 )) {
lo 31:2b8b98f3feed 300 resolution = RAM[4] & 0x60;
lo 31:2b8b98f3feed 301 if (resolution == 0x00) // 9 bits
lo 31:2b8b98f3feed 302 delay_time = 94;
lo 31:2b8b98f3feed 303 if (resolution == 0x20) // 10 bits
lo 31:2b8b98f3feed 304 delay_time = 188;
lo 31:2b8b98f3feed 305 if (resolution == 0x40) // 11 bits. Note 12bits uses the 750ms default
lo 31:2b8b98f3feed 306 delay_time = 375;
lo 31:2b8b98f3feed 307 }
lo 31:2b8b98f3feed 308 }
lo 31:2b8b98f3feed 309
lo 31:2b8b98f3feed 310 onewire_byte_out( 0x44); // perform temperature conversion
lo 31:2b8b98f3feed 311 if (_parasite_power) {
lo 31:2b8b98f3feed 312 if (_power_mosfet) {
lo 31:2b8b98f3feed 313 _parasitepin = _power_polarity; // Parasite power strong pullup
lo 31:2b8b98f3feed 314 wait_ms(delay_time);
lo 31:2b8b98f3feed 315 _parasitepin = !_power_polarity;
lo 31:2b8b98f3feed 316 delay_time = 0;
lo 31:2b8b98f3feed 317 } else {
lo 31:2b8b98f3feed 318 _datapin.output();
lo 31:2b8b98f3feed 319 _datapin.write(1);
lo 31:2b8b98f3feed 320 wait_ms(delay_time);
lo 31:2b8b98f3feed 321 _datapin.input();
lo 31:2b8b98f3feed 322 }
lo 31:2b8b98f3feed 323 } else {
lo 31:2b8b98f3feed 324 if (wait) {
lo 31:2b8b98f3feed 325 wait_ms(delay_time);
lo 31:2b8b98f3feed 326 delay_time = 0;
lo 31:2b8b98f3feed 327 }
lo 31:2b8b98f3feed 328 }
lo 31:2b8b98f3feed 329 return delay_time;
lo 31:2b8b98f3feed 330 }
lo 31:2b8b98f3feed 331 void read_RAM() {
lo 31:2b8b98f3feed 332 // This will copy the DS18B20_component's 9 bytes of RAM data
lo 31:2b8b98f3feed 333 // into the objects RAM array. Functions that use
lo 31:2b8b98f3feed 334 // RAM values will automaticly call this procedure.
lo 31:2b8b98f3feed 335 int i;
lo 31:2b8b98f3feed 336 match_ROM(); // Select this device
lo 31:2b8b98f3feed 337 onewire_byte_out( 0xBE); //Read Scratchpad command
lo 31:2b8b98f3feed 338 for(i=0;i<9;i++) {
lo 31:2b8b98f3feed 339 RAM[i] = onewire_byte_in();
lo 31:2b8b98f3feed 340 }
lo 31:2b8b98f3feed 341 // if (!RAM_checksum_error())
lo 31:2b8b98f3feed 342 // crcerr = 1;
lo 31:2b8b98f3feed 343 }
lo 31:2b8b98f3feed 344 bool setResolution(unsigned int resolution) {
lo 31:2b8b98f3feed 345 bool answer = false;
lo 31:2b8b98f3feed 346 resolution = resolution - 9;
lo 31:2b8b98f3feed 347 if (resolution < 4) {
lo 31:2b8b98f3feed 348 resolution = resolution<<5; // align the bits
lo 31:2b8b98f3feed 349 RAM[4] = (RAM[4] & 0x60) | resolution; // mask out old data, insert new
lo 31:2b8b98f3feed 350 write_scratchpad ((RAM[2]<<8) + RAM[3]);
lo 31:2b8b98f3feed 351 // store_scratchpad (DS18B20_component::this_device); // Need to test if this is required
lo 31:2b8b98f3feed 352 answer = true;
lo 31:2b8b98f3feed 353 }
lo 31:2b8b98f3feed 354 return answer;
lo 31:2b8b98f3feed 355 }
lo 31:2b8b98f3feed 356 void write_scratchpad(int data) {
lo 31:2b8b98f3feed 357 RAM[3] = data;
lo 31:2b8b98f3feed 358 RAM[2] = data>>8;
lo 31:2b8b98f3feed 359 match_ROM();
lo 31:2b8b98f3feed 360 onewire_byte_out(0x4E); // Copy scratchpad into DS18B20_component ram memory
lo 31:2b8b98f3feed 361 onewire_byte_out(RAM[2]); // T(H)
lo 31:2b8b98f3feed 362 onewire_byte_out(RAM[3]); // T(L)
lo 31:2b8b98f3feed 363 if ((FAMILY_CODE == FAMILY_CODE_DS18B20 ) || (FAMILY_CODE == FAMILY_CODE_DS1822 )) {
lo 31:2b8b98f3feed 364 onewire_byte_out(RAM[4]); // Configuration register
lo 31:2b8b98f3feed 365 }
lo 31:2b8b98f3feed 366 }
lo 31:2b8b98f3feed 367 float temperature(char scale) {
lo 31:2b8b98f3feed 368 // The data specs state that count_per_degree should be 0x10 (16), I found my devices
lo 31:2b8b98f3feed 369 // to have a count_per_degree of 0x4B (75). With the standard resolution of 1/2 deg C
lo 31:2b8b98f3feed 370 // this allowed an expanded resolution of 1/150th of a deg C. I wouldn't rely on this
lo 31:2b8b98f3feed 371 // being super acurate, but it does allow for a smooth display in the 1/10ths of a
lo 31:2b8b98f3feed 372 // deg C or F scales.
lo 31:2b8b98f3feed 373 float answer, remaining_count, count_per_degree;
lo 31:2b8b98f3feed 374 int reading;
lo 31:2b8b98f3feed 375 read_RAM();
lo 31:2b8b98f3feed 376 if (RAM_checksum_error())
lo 31:2b8b98f3feed 377 // Indicate we got a CRC error
lo 31:2b8b98f3feed 378 answer = invalid_conversion;
lo 31:2b8b98f3feed 379 else
lo 31:2b8b98f3feed 380 {
lo 31:2b8b98f3feed 381 reading = (RAM[1] << 8) + RAM[0];
lo 31:2b8b98f3feed 382 if (reading & 0x8000) { // negative degrees C
lo 31:2b8b98f3feed 383 reading = 0-((reading ^ 0xffff) + 1); // 2's comp then convert to signed int
lo 31:2b8b98f3feed 384 }
lo 31:2b8b98f3feed 385 answer = reading +0.0; // convert to floating point
lo 31:2b8b98f3feed 386 if ((FAMILY_CODE == FAMILY_CODE_DS18B20 ) || (FAMILY_CODE == FAMILY_CODE_DS1822 )) {
lo 31:2b8b98f3feed 387 answer = answer / 16.0f;
lo 31:2b8b98f3feed 388 }
lo 31:2b8b98f3feed 389 else {
lo 31:2b8b98f3feed 390 remaining_count = RAM[6];
lo 31:2b8b98f3feed 391 count_per_degree = RAM[7];
lo 31:2b8b98f3feed 392 answer = floor(answer/2.0f) - 0.25f + (count_per_degree - remaining_count) / count_per_degree;
lo 31:2b8b98f3feed 393 }
lo 31:2b8b98f3feed 394 if (scale=='F' or scale=='f')
lo 31:2b8b98f3feed 395 // Convert to deg F
lo 31:2b8b98f3feed 396 answer = answer * 9.0f / 5.0f + 32.0f;
lo 31:2b8b98f3feed 397 }
lo 31:2b8b98f3feed 398 return answer;
lo 31:2b8b98f3feed 399 }
lo 31:2b8b98f3feed 400 bool read_power_supply(devices device) {
lo 31:2b8b98f3feed 401 // This will return true if the device (or all devices) are Vcc powered
lo 31:2b8b98f3feed 402 // This will return false if the device (or ANY device) is parasite powered
lo 31:2b8b98f3feed 403 if (device==all_devices)
lo 31:2b8b98f3feed 404 skip_ROM(); // Skip ROM command, will poll for any device using parasite power
lo 31:2b8b98f3feed 405 else
lo 31:2b8b98f3feed 406 match_ROM();
lo 31:2b8b98f3feed 407 onewire_byte_out(0xB4); // Read power supply command
lo 31:2b8b98f3feed 408 return onewire_bit_in(&this->_datapin);
lo 31:2b8b98f3feed 409 }
lo 31:2b8b98f3feed 410 void readValues(void){
lo 31:2b8b98f3feed 411 for (std::vector<misnet::Service*>::iterator
lo 31:2b8b98f3feed 412 srvIt = this->getServices().begin();
lo 31:2b8b98f3feed 413 srvIt != this->getServices().end();
lo 31:2b8b98f3feed 414 srvIt++) {
lo 31:2b8b98f3feed 415 (*srvIt)->readValue();
lo 31:2b8b98f3feed 416 }
lo 31:2b8b98f3feed 417 }
lo 31:2b8b98f3feed 418
lo 31:2b8b98f3feed 419 private:
lo 31:2b8b98f3feed 420 bool _parasite_power;
lo 31:2b8b98f3feed 421 bool _power_mosfet;
lo 31:2b8b98f3feed 422 bool _power_polarity;
lo 31:2b8b98f3feed 423 char _ROM[8],RAM[9];
lo 31:2b8b98f3feed 424 DigitalInOut _datapin;
lo 31:2b8b98f3feed 425 DigitalOut _parasitepin;
lo 31:2b8b98f3feed 426 static LinkedList<node> probes;
lo 31:2b8b98f3feed 427
lo 31:2b8b98f3feed 428 class ds18b20_temperature : public Service{
lo 31:2b8b98f3feed 429
lo 31:2b8b98f3feed 430 public:
lo 31:2b8b98f3feed 431 ds18b20_temperature(
lo 31:2b8b98f3feed 432 DEVICE_TYPE type,
lo 31:2b8b98f3feed 433 MISNET_CODE misnet_code,
lo 31:2b8b98f3feed 434 STATE state,
lo 31:2b8b98f3feed 435 ACCESS_TYPE access_type,
lo 31:2b8b98f3feed 436 REQUEST_MODE request_mode,
lo 31:2b8b98f3feed 437 UP_MODE up_mode,
lo 31:2b8b98f3feed 438 ACCESS_PIN access_pins[6],
lo 31:2b8b98f3feed 439 uint32_t subsample_rate,
lo 31:2b8b98f3feed 440 ACTION action,
lo 31:2b8b98f3feed 441 OUTPUT_MODE output_mode,
lo 31:2b8b98f3feed 442 string comment,
lo 31:2b8b98f3feed 443 ds18b20_temperature* parent
lo 31:2b8b98f3feed 444 )
lo 31:2b8b98f3feed 445 {
lo 31:2b8b98f3feed 446 this->parent = parent;
lo 31:2b8b98f3feed 447 this->setDeviceType(type);
lo 31:2b8b98f3feed 448 this->setMisnetCode(misnet_code);
lo 31:2b8b98f3feed 449 this->setState(state);
lo 31:2b8b98f3feed 450 this->setAccessType(access_type);
lo 31:2b8b98f3feed 451 this->setRequestMode(request_mode);
lo 31:2b8b98f3feed 452 this->setUpMode(up_mode);
lo 31:2b8b98f3feed 453 this->setAction(action);
lo 31:2b8b98f3feed 454 this->setOutputMode(output_mode);
lo 31:2b8b98f3feed 455 this->setComment(comment);
lo 31:2b8b98f3feed 456 this->setSubsampleRate(subsample_rate);
lo 31:2b8b98f3feed 457 }
lo 31:2b8b98f3feed 458 virtual ~ds18b20_temperature() {}
lo 31:2b8b98f3feed 459 float readValue(void) {
lo 31:2b8b98f3feed 460 // TODO : the call is blocking
lo 31:2b8b98f3feed 461 parent->convertTemperature(true, this_device);
lo 31:2b8b98f3feed 462 return parent->temperature('c');
lo 31:2b8b98f3feed 463 }
lo 31:2b8b98f3feed 464
lo 31:2b8b98f3feed 465 private:
lo 31:2b8b98f3feed 466 ds18b20_component *parent;
lo 31:2b8b98f3feed 467 };
lo 31:2b8b98f3feed 468 };
lo 31:2b8b98f3feed 469
lo 31:2b8b98f3feed 470 #endif /* DS18B20_COMPONENT_HPP_ */
lo 31:2b8b98f3feed 471