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ECE4180 Final Project
Dependencies: 4DGL-uLCD-SE DS1820 PinDetect Speaker mbed
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Diff: DS18B20.cpp
- Revision:
- 1:2d86c674a78b
- Parent:
- 0:03ec282c2908
--- a/DS18B20.cpp Fri Jan 29 19:01:56 2010 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,86 +0,0 @@ -#include "DS18B20.h" -#include "DS1Wire.h" -#include "mbed.h" -#include <stdint.h> - -// Device byte commands over 1-wire serial -enum COMMANDS { READ_ROM = 0x33, CONVERT = 0x44, READ_SCRATCHPAD = 0xBE, SKIP_ROM = 0xCC }; - -// device onboard register layout -typedef struct { - uint8_t LSB; - uint8_t MSB; - uint8_t Th; - uint8_t Tl; - uint8_t config; - uint8_t reserved0xFF; - uint8_t reserved0xCH; - uint8_t reserved0x10; - uint8_t CRC; -} ScratchPad_t; - - -DigitalOut conversionInProgress(LED4); // conversion in progress -DigitalOut resetFailure(LED1); // for error reporting -extern DigitalInOut sensor; // sensor pin - -static void inError() { - while (1) { - resetFailure = !resetFailure; - wait(0.2); - } -} - -void DoConversion() { - if (Reset(sensor) != 0) { - inError(); - } else { - conversionInProgress = 1; // led on - WriteByte(sensor, SKIP_ROM); // Skip ROM - WriteByte(sensor, CONVERT); // Convert - while (ReadBit(sensor) == 0) { - // wait for conversion to complete - } - conversionInProgress = 0; // led off - } -} - -uint32_t GetTemperature() { - uint32_t result = 0; - if (Reset(sensor) != 0) { - inError(); - } else { - ScratchPad_t scratchpad; - WriteByte(sensor, SKIP_ROM); // Skip ROM - WriteByte(sensor, READ_SCRATCHPAD); // Read Scrachpad - scratchpad.LSB = ReadByte(sensor); - scratchpad.MSB = ReadByte(sensor); - Reset(sensor); // terminate read as we only want temperature - result = ((scratchpad.MSB << 8) | scratchpad.LSB); - } - return result; -} - -ROM_Code_t ReadROM() { - ROM_Code_t ROM_Code; - if (Reset(sensor) != 0) { - inError(); - } else { - - WriteByte(sensor, READ_ROM); // Read ROM - for (uint32_t i = 0; i < 8; ++i) { - ROM_Code.rom[i] = ReadByte(sensor); - } - } - return ROM_Code; -} - -// temperature is store as 7.4 fixed point format (assuming 12 bit conversion) -void displayTemperature(Serial& s) { - DoConversion(); - uint32_t temp = GetTemperature(); - float f = (temp & 0x0F) * 0.0625; // calculate .4 part - f += (temp >> 4); // add 7.0 part to it - s.printf("Temp is %2.1fC\n\r", f); // display in 2.1 format -} -