Diltech RM Consultant / Mbed OS Double_I2C_Sample

Sample code with BluePill STM32F103C8 and Oled SSD1306 and LCD1602 on same connect on DS18B20.

Dependencies:   TextLCD

ds18b20-single/DS18B20.cpp@1:27d0c6ee0e55, 2022-05-29 (annotated)

Committer:
diltech
Date:
Sun May 29 18:40:06 2022 -0400
Revision:
1:27d0c6ee0e55
Parent:
0:47b4bbc994df 
Etape1

Who changed what in which revision?

UserRevisionLine numberNew contents of line
diltech 0:47b4bbc994df 1 /* MIT License
diltech 0:47b4bbc994df 2 *
diltech 0:47b4bbc994df 3 * Copyright (c) 2020 Lukas Gessner
diltech 0:47b4bbc994df 4 *
diltech 0:47b4bbc994df 5 * Permission is hereby granted, free of charge, to any person obtaining a copy
diltech 0:47b4bbc994df 6 * of this software and associated documentation files (the "Software"), to deal
diltech 0:47b4bbc994df 7 * in the Software without restriction, including without limitation the rights
diltech 0:47b4bbc994df 8 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
diltech 0:47b4bbc994df 9 * copies of the Software, and to permit persons to whom the Software is
diltech 0:47b4bbc994df 10 * furnished to do so, subject to the following conditions:
diltech 0:47b4bbc994df 11 *
diltech 0:47b4bbc994df 12 * The above copyright notice and this permission notice shall be included in all
diltech 0:47b4bbc994df 13 * copies or substantial portions of the Software.
diltech 0:47b4bbc994df 14 *
diltech 0:47b4bbc994df 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
diltech 0:47b4bbc994df 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
diltech 0:47b4bbc994df 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
diltech 0:47b4bbc994df 18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
diltech 0:47b4bbc994df 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
diltech 0:47b4bbc994df 20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
diltech 0:47b4bbc994df 21 * SOFTWARE.
diltech 0:47b4bbc994df 22 */
diltech 0:47b4bbc994df 23
diltech 0:47b4bbc994df 24 #include "DS18B20.h"
diltech 0:47b4bbc994df 25
diltech 0:47b4bbc994df 26 OWI::OWI(PinName pin):owi_io(pin)
diltech 0:47b4bbc994df 27 {
diltech 0:47b4bbc994df 28
diltech 0:47b4bbc994df 29 }
diltech 0:47b4bbc994df 30
diltech 0:47b4bbc994df 31 void OWI::write0()
diltech 0:47b4bbc994df 32 {
diltech 0:47b4bbc994df 33 owi_io.output(); // timeslot = 70us
diltech 0:47b4bbc994df 34 owi_io.write(0); // owi = 0;
diltech 0:47b4bbc994df 35 wait_us(60);
diltech 0:47b4bbc994df 36 owi_io.input();
diltech 0:47b4bbc994df 37 wait_us(10);
diltech 0:47b4bbc994df 38 }
diltech 0:47b4bbc994df 39
diltech 0:47b4bbc994df 40 void OWI::write1() // timeslot = 70us
diltech 0:47b4bbc994df 41 {
diltech 0:47b4bbc994df 42 owi_io.output();
diltech 0:47b4bbc994df 43 owi_io.write(0); // owi = 0;
diltech 0:47b4bbc994df 44 wait_us(6);
diltech 0:47b4bbc994df 45 owi_io.input();
diltech 0:47b4bbc994df 46 wait_us(64);
diltech 0:47b4bbc994df 47 }
diltech 0:47b4bbc994df 48
diltech 0:47b4bbc994df 49 unsigned char OWI::readBit()
diltech 0:47b4bbc994df 50 {
diltech 0:47b4bbc994df 51 unsigned char readbit;
diltech 0:47b4bbc994df 52
diltech 0:47b4bbc994df 53 owi_io.output();
diltech 0:47b4bbc994df 54 owi_io.write(0); // owi = 0;
diltech 0:47b4bbc994df 55 wait_us(6);
diltech 0:47b4bbc994df 56 owi_io.input();
diltech 0:47b4bbc994df 57 wait_us(9);
diltech 0:47b4bbc994df 58 readbit = owi_io.read();
diltech 0:47b4bbc994df 59 wait_us(55);
diltech 0:47b4bbc994df 60
diltech 0:47b4bbc994df 61 return readbit;
diltech 0:47b4bbc994df 62 }
diltech 0:47b4bbc994df 63
diltech 0:47b4bbc994df 64 unsigned char OWI::detectPresence()
diltech 0:47b4bbc994df 65 {
diltech 0:47b4bbc994df 66 core_util_critical_section_enter();
diltech 0:47b4bbc994df 67
diltech 0:47b4bbc994df 68 unsigned char presencebit;
diltech 0:47b4bbc994df 69
diltech 0:47b4bbc994df 70 owi_io.output();
diltech 0:47b4bbc994df 71 owi_io.write(0); // owi = 0;
diltech 0:47b4bbc994df 72 wait_us(480);
diltech 0:47b4bbc994df 73 owi_io.input();
diltech 0:47b4bbc994df 74 wait_us(70);
diltech 0:47b4bbc994df 75 presencebit = !owi_io.read();
diltech 0:47b4bbc994df 76 wait_us(410);
diltech 0:47b4bbc994df 77
diltech 0:47b4bbc994df 78 core_util_critical_section_exit();
diltech 0:47b4bbc994df 79
diltech 0:47b4bbc994df 80 return presencebit;
diltech 0:47b4bbc994df 81 }
diltech 0:47b4bbc994df 82
diltech 0:47b4bbc994df 83 void OWI::sendByte(unsigned char data)
diltech 0:47b4bbc994df 84 {
diltech 0:47b4bbc994df 85 core_util_critical_section_enter();
diltech 0:47b4bbc994df 86
diltech 0:47b4bbc994df 87 unsigned char temp;
diltech 0:47b4bbc994df 88 unsigned char i;
diltech 0:47b4bbc994df 89 for (i = 0; i < 8; i++)
diltech 0:47b4bbc994df 90 {
diltech 0:47b4bbc994df 91 temp = data & 0x01;
diltech 0:47b4bbc994df 92 if (temp)
diltech 0:47b4bbc994df 93 {
diltech 0:47b4bbc994df 94 this->write1();
diltech 0:47b4bbc994df 95 }
diltech 0:47b4bbc994df 96 else
diltech 0:47b4bbc994df 97 {
diltech 0:47b4bbc994df 98 this->write0();
diltech 0:47b4bbc994df 99 }
diltech 0:47b4bbc994df 100 data >>= 1;
diltech 0:47b4bbc994df 101 }
diltech 0:47b4bbc994df 102
diltech 0:47b4bbc994df 103 core_util_critical_section_exit();
diltech 0:47b4bbc994df 104 }
diltech 0:47b4bbc994df 105
diltech 0:47b4bbc994df 106 unsigned char OWI::receiveByte()
diltech 0:47b4bbc994df 107 {
diltech 0:47b4bbc994df 108 core_util_critical_section_enter();
diltech 0:47b4bbc994df 109
diltech 0:47b4bbc994df 110 unsigned char data;
diltech 0:47b4bbc994df 111 unsigned char i;
diltech 0:47b4bbc994df 112 data = 0x00;
diltech 0:47b4bbc994df 113 for (i = 0; i < 8; i++)
diltech 0:47b4bbc994df 114 {
diltech 0:47b4bbc994df 115 data >>= 1;
diltech 0:47b4bbc994df 116 if (this->readBit())
diltech 0:47b4bbc994df 117 {
diltech 0:47b4bbc994df 118 data |= 0x80;
diltech 0:47b4bbc994df 119 }
diltech 0:47b4bbc994df 120 }
diltech 0:47b4bbc994df 121
diltech 0:47b4bbc994df 122 core_util_critical_section_exit();
diltech 0:47b4bbc994df 123 return data;
diltech 0:47b4bbc994df 124 }
diltech 0:47b4bbc994df 125
diltech 0:47b4bbc994df 126
diltech 0:47b4bbc994df 127 DS18B20::DS18B20(PinName pin):DS18B20_OWI(pin)
diltech 0:47b4bbc994df 128 {
diltech 0:47b4bbc994df 129
diltech 0:47b4bbc994df 130 }
diltech 0:47b4bbc994df 131
diltech 0:47b4bbc994df 132 float DS18B20::readTemp()
diltech 0:47b4bbc994df 133 {
diltech 0:47b4bbc994df 134 unsigned char msb,lsb;
diltech 0:47b4bbc994df 135 int itemp;
diltech 0:47b4bbc994df 136 float ftemp;
diltech 0:47b4bbc994df 137
diltech 0:47b4bbc994df 138 DS18B20_OWI.detectPresence();
diltech 0:47b4bbc994df 139 DS18B20_OWI.sendByte(OWI_SKIP_ROM);
diltech 0:47b4bbc994df 140 DS18B20_OWI.sendByte(DS18B20_START);
diltech 0:47b4bbc994df 141
diltech 0:47b4bbc994df 142 #if MBED_MAJOR_VERSION >= 6
diltech 0:47b4bbc994df 143 ThisThread::sleep_for(750ms);
diltech 0:47b4bbc994df 144 #elif MBED_MAJOR_VERSION < 5
diltech 0:47b4bbc994df 145 wait(0.75);
diltech 0:47b4bbc994df 146 #else
diltech 0:47b4bbc994df 147 ThisThread::sleep_for(750);
diltech 0:47b4bbc994df 148 #endif
diltech 0:47b4bbc994df 149
diltech 0:47b4bbc994df 150 DS18B20_OWI.detectPresence();
diltech 0:47b4bbc994df 151 DS18B20_OWI.sendByte(OWI_SKIP_ROM);
diltech 0:47b4bbc994df 152 DS18B20_OWI.sendByte(DS18B20_READ_SCRATCH_PAD);
diltech 0:47b4bbc994df 153 lsb = DS18B20_OWI.receiveByte();
diltech 0:47b4bbc994df 154 msb = DS18B20_OWI.receiveByte();
diltech 0:47b4bbc994df 155
diltech 0:47b4bbc994df 156 itemp = (msb<<8)+lsb;
diltech 0:47b4bbc994df 157 ftemp = (float)itemp / 16.0f;
diltech 0:47b4bbc994df 158
diltech 0:47b4bbc994df 159 return ftemp;
diltech 0:47b4bbc994df 160 }
diltech 0:47b4bbc994df 161
diltech 0:47b4bbc994df 162
diltech 0:47b4bbc994df 163