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Dependencies:   mbed TextLCD

ds18b20/DS18B20.cpp@3:0ef2ced1f02d, 2014-04-12 (annotated)

Committer:
redplam
Date:
Sat Apr 12 20:07:15 2014 +0000
Revision:
3:0ef2ced1f02d
Parent:
1:3aec489c7366 
myproj

Who changed what in which revision?

UserRevisionLine numberNew contents of line
redplam 1:3aec489c7366 1 #include "DS18B20.h"
redplam 1:3aec489c7366 2 #include "DS1Wire.h"
redplam 1:3aec489c7366 3 #include "mbed.h"
redplam 1:3aec489c7366 4 #include <stdint.h>
redplam 1:3aec489c7366 5
redplam 1:3aec489c7366 6 // Device byte commands over 1-wire serial
redplam 1:3aec489c7366 7 enum COMMANDS { READ_ROM = 0x33, CONVERT = 0x44, READ_SCRATCHPAD = 0xBE, SKIP_ROM = 0xCC };
redplam 1:3aec489c7366 8
redplam 1:3aec489c7366 9 // device onboard register layout
redplam 1:3aec489c7366 10 typedef struct {
redplam 1:3aec489c7366 11 uint8_t LSB;
redplam 1:3aec489c7366 12 uint8_t MSB;
redplam 1:3aec489c7366 13 uint8_t Th;
redplam 1:3aec489c7366 14 uint8_t Tl;
redplam 1:3aec489c7366 15 uint8_t config;
redplam 1:3aec489c7366 16 uint8_t reserved0xFF;
redplam 1:3aec489c7366 17 uint8_t reserved0xCH;
redplam 1:3aec489c7366 18 uint8_t reserved0x10;
redplam 1:3aec489c7366 19 uint8_t CRC;
redplam 1:3aec489c7366 20 } ScratchPad_t;
redplam 1:3aec489c7366 21
redplam 1:3aec489c7366 22
redplam 1:3aec489c7366 23 DigitalOut conversionInProgress(LED4); // conversion in progress
redplam 1:3aec489c7366 24 DigitalOut resetFailure(LED1); // for error reporting
redplam 1:3aec489c7366 25 extern DigitalInOut sensor; // sensor pin
redplam 1:3aec489c7366 26
redplam 1:3aec489c7366 27 static void inError() {
redplam 1:3aec489c7366 28 while (1) {
redplam 1:3aec489c7366 29 resetFailure = !resetFailure;
redplam 1:3aec489c7366 30 wait(0.2);
redplam 1:3aec489c7366 31 }
redplam 1:3aec489c7366 32 }
redplam 1:3aec489c7366 33
redplam 1:3aec489c7366 34 void DoConversion() {
redplam 1:3aec489c7366 35 if (Reset(sensor) != 0) {
redplam 1:3aec489c7366 36 inError();
redplam 1:3aec489c7366 37 } else {
redplam 1:3aec489c7366 38 conversionInProgress = 1; // led on
redplam 1:3aec489c7366 39 WriteByte(sensor, SKIP_ROM); // Skip ROM
redplam 1:3aec489c7366 40 WriteByte(sensor, CONVERT); // Convert
redplam 1:3aec489c7366 41 while (ReadBit(sensor) == 0) {
redplam 1:3aec489c7366 42 // wait for conversion to complete
redplam 1:3aec489c7366 43 }
redplam 1:3aec489c7366 44 conversionInProgress = 0; // led off
redplam 1:3aec489c7366 45 }
redplam 1:3aec489c7366 46 }
redplam 1:3aec489c7366 47
redplam 1:3aec489c7366 48 uint32_t GetTemperature() {
redplam 1:3aec489c7366 49 uint32_t result = 0;
redplam 1:3aec489c7366 50 if (Reset(sensor) != 0) {
redplam 1:3aec489c7366 51 inError();
redplam 1:3aec489c7366 52 } else {
redplam 1:3aec489c7366 53 ScratchPad_t scratchpad;
redplam 1:3aec489c7366 54 WriteByte(sensor, SKIP_ROM); // Skip ROM
redplam 1:3aec489c7366 55 WriteByte(sensor, READ_SCRATCHPAD); // Read Scrachpad
redplam 1:3aec489c7366 56 scratchpad.LSB = ReadByte(sensor);
redplam 1:3aec489c7366 57 scratchpad.MSB = ReadByte(sensor);
redplam 1:3aec489c7366 58 Reset(sensor); // terminate read as we only want temperature
redplam 1:3aec489c7366 59 result = ((scratchpad.MSB << 8) | scratchpad.LSB);
redplam 1:3aec489c7366 60 }
redplam 1:3aec489c7366 61 return result;
redplam 1:3aec489c7366 62 }
redplam 1:3aec489c7366 63 float mytemp(void) {
redplam 1:3aec489c7366 64 DoConversion();
redplam 1:3aec489c7366 65 uint32_t temp = GetTemperature();
redplam 1:3aec489c7366 66 float f = (temp & 0x0F) * 0.0625; // calculate .4 part
redplam 1:3aec489c7366 67 f += (temp >> 4); // add 7.0 part to it
redplam 1:3aec489c7366 68 return f;
redplam 1:3aec489c7366 69 //s.printf("Temp is %2.1fC\n\r", f); // display in 2.1 format
redplam 1:3aec489c7366 70 }
redplam 1:3aec489c7366 71