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Dependencies: HCSR04 USBDevice mbed-src mbed mbed
Fork of Serial_HelloWorld_Mbed by
DS18B20.cpp@1:a66cf68ec8ca, 2014-04-14 (annotated)
- Committer:
- redplam
- Date:
- Mon Apr 14 14:38:46 2014 +0000
- Revision:
- 1:a66cf68ec8ca
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Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
redplam | 1:a66cf68ec8ca | 1 | #include "DS18B20.h" |
redplam | 1:a66cf68ec8ca | 2 | #include "DS1Wire.h" |
redplam | 1:a66cf68ec8ca | 3 | #include "mbed.h" |
redplam | 1:a66cf68ec8ca | 4 | #include <stdint.h> |
redplam | 1:a66cf68ec8ca | 5 | |
redplam | 1:a66cf68ec8ca | 6 | // Device byte commands over 1-wire serial |
redplam | 1:a66cf68ec8ca | 7 | enum COMMANDS { READ_ROM = 0x33, CONVERT = 0x44, READ_SCRATCHPAD = 0xBE, SKIP_ROM = 0xCC }; |
redplam | 1:a66cf68ec8ca | 8 | |
redplam | 1:a66cf68ec8ca | 9 | // device onboard register layout |
redplam | 1:a66cf68ec8ca | 10 | typedef struct { |
redplam | 1:a66cf68ec8ca | 11 | uint8_t LSB; |
redplam | 1:a66cf68ec8ca | 12 | uint8_t MSB; |
redplam | 1:a66cf68ec8ca | 13 | uint8_t Th; |
redplam | 1:a66cf68ec8ca | 14 | uint8_t Tl; |
redplam | 1:a66cf68ec8ca | 15 | uint8_t config; |
redplam | 1:a66cf68ec8ca | 16 | uint8_t reserved0xFF; |
redplam | 1:a66cf68ec8ca | 17 | uint8_t reserved0xCH; |
redplam | 1:a66cf68ec8ca | 18 | uint8_t reserved0x10; |
redplam | 1:a66cf68ec8ca | 19 | uint8_t CRC; |
redplam | 1:a66cf68ec8ca | 20 | } ScratchPad_t; |
redplam | 1:a66cf68ec8ca | 21 | |
redplam | 1:a66cf68ec8ca | 22 | |
redplam | 1:a66cf68ec8ca | 23 | DigitalOut conversionInProgress(LED4); // conversion in progress |
redplam | 1:a66cf68ec8ca | 24 | DigitalOut resetFailure(LED1); // for error reporting |
redplam | 1:a66cf68ec8ca | 25 | extern DigitalInOut sensor; // sensor pin |
redplam | 1:a66cf68ec8ca | 26 | |
redplam | 1:a66cf68ec8ca | 27 | static void inError() { |
redplam | 1:a66cf68ec8ca | 28 | while (1) { |
redplam | 1:a66cf68ec8ca | 29 | resetFailure = !resetFailure; |
redplam | 1:a66cf68ec8ca | 30 | wait(0.2); |
redplam | 1:a66cf68ec8ca | 31 | } |
redplam | 1:a66cf68ec8ca | 32 | } |
redplam | 1:a66cf68ec8ca | 33 | |
redplam | 1:a66cf68ec8ca | 34 | void DoConversion() { |
redplam | 1:a66cf68ec8ca | 35 | if (Reset(sensor) != 0) { |
redplam | 1:a66cf68ec8ca | 36 | inError(); |
redplam | 1:a66cf68ec8ca | 37 | } else { |
redplam | 1:a66cf68ec8ca | 38 | conversionInProgress = 1; // led on |
redplam | 1:a66cf68ec8ca | 39 | WriteByte(sensor, SKIP_ROM); // Skip ROM |
redplam | 1:a66cf68ec8ca | 40 | WriteByte(sensor, CONVERT); // Convert |
redplam | 1:a66cf68ec8ca | 41 | while (ReadBit(sensor) == 0) { |
redplam | 1:a66cf68ec8ca | 42 | // wait for conversion to complete |
redplam | 1:a66cf68ec8ca | 43 | } |
redplam | 1:a66cf68ec8ca | 44 | conversionInProgress = 0; // led off |
redplam | 1:a66cf68ec8ca | 45 | } |
redplam | 1:a66cf68ec8ca | 46 | } |
redplam | 1:a66cf68ec8ca | 47 | |
redplam | 1:a66cf68ec8ca | 48 | uint32_t GetTemperature() { |
redplam | 1:a66cf68ec8ca | 49 | uint32_t result = 0; |
redplam | 1:a66cf68ec8ca | 50 | if (Reset(sensor) != 0) { |
redplam | 1:a66cf68ec8ca | 51 | inError(); |
redplam | 1:a66cf68ec8ca | 52 | } else { |
redplam | 1:a66cf68ec8ca | 53 | ScratchPad_t scratchpad; |
redplam | 1:a66cf68ec8ca | 54 | WriteByte(sensor, SKIP_ROM); // Skip ROM |
redplam | 1:a66cf68ec8ca | 55 | WriteByte(sensor, READ_SCRATCHPAD); // Read Scrachpad |
redplam | 1:a66cf68ec8ca | 56 | scratchpad.LSB = ReadByte(sensor); |
redplam | 1:a66cf68ec8ca | 57 | scratchpad.MSB = ReadByte(sensor); |
redplam | 1:a66cf68ec8ca | 58 | Reset(sensor); // terminate read as we only want temperature |
redplam | 1:a66cf68ec8ca | 59 | result = ((scratchpad.MSB << 8) | scratchpad.LSB); |
redplam | 1:a66cf68ec8ca | 60 | } |
redplam | 1:a66cf68ec8ca | 61 | return result; |
redplam | 1:a66cf68ec8ca | 62 | } |
redplam | 1:a66cf68ec8ca | 63 | |
redplam | 1:a66cf68ec8ca | 64 | ROM_Code_t ReadROM() { |
redplam | 1:a66cf68ec8ca | 65 | ROM_Code_t ROM_Code; |
redplam | 1:a66cf68ec8ca | 66 | if (Reset(sensor) != 0) { |
redplam | 1:a66cf68ec8ca | 67 | inError(); |
redplam | 1:a66cf68ec8ca | 68 | } else { |
redplam | 1:a66cf68ec8ca | 69 | |
redplam | 1:a66cf68ec8ca | 70 | WriteByte(sensor, READ_ROM); // Read ROM |
redplam | 1:a66cf68ec8ca | 71 | for (uint32_t i = 0; i < 8; ++i) { |
redplam | 1:a66cf68ec8ca | 72 | ROM_Code.rom[i] = ReadByte(sensor); |
redplam | 1:a66cf68ec8ca | 73 | } |
redplam | 1:a66cf68ec8ca | 74 | } |
redplam | 1:a66cf68ec8ca | 75 | return ROM_Code; |
redplam | 1:a66cf68ec8ca | 76 | } |
redplam | 1:a66cf68ec8ca | 77 | |
redplam | 1:a66cf68ec8ca | 78 | // temperature is store as 7.4 fixed point format (assuming 12 bit conversion) |
redplam | 1:a66cf68ec8ca | 79 | void displayTemperature(Serial& s) { |
redplam | 1:a66cf68ec8ca | 80 | DoConversion(); |
redplam | 1:a66cf68ec8ca | 81 | uint32_t temp = GetTemperature(); |
redplam | 1:a66cf68ec8ca | 82 | float f = (temp & 0x0F) * 0.0625; // calculate .4 part |
redplam | 1:a66cf68ec8ca | 83 | f += (temp >> 4); // add 7.0 part to it |
redplam | 1:a66cf68ec8ca | 84 | s.printf("Temp is %2.1fC\n\r", f); // display in 2.1 format |
redplam | 1:a66cf68ec8ca | 85 | } |
redplam | 1:a66cf68ec8ca | 86 | |
redplam | 1:a66cf68ec8ca | 87 | // temperature is store as 7.4 fixed point format (assuming 12 bit conversion) |
redplam | 1:a66cf68ec8ca | 88 | void showTemperature(float *f) { |
redplam | 1:a66cf68ec8ca | 89 | DoConversion(); |
redplam | 1:a66cf68ec8ca | 90 | uint32_t temp = GetTemperature(); |
redplam | 1:a66cf68ec8ca | 91 | *f = (temp & 0x0F) * 0.0625; // calculate .4 part |
redplam | 1:a66cf68ec8ca | 92 | *f += (temp >> 4); // add 7.0 part to it |
redplam | 1:a66cf68ec8ca | 93 | //return(f); |
redplam | 1:a66cf68ec8ca | 94 | //s.printf("Temp is %2.1fC\n\r", f); // display in 2.1 format |
redplam | 1:a66cf68ec8ca | 95 | } |
redplam | 1:a66cf68ec8ca | 96 |