/***************************************************?
??This?is?a?library?for?the?Adafruit?Thermocouple?Sensor?w/MAX31855K

??Designed?specifically?to?work?with?the?Adafruit?Thermocouple?Sensor
??---->?https://www.adafruit.com/products/269

??These?displays?use?SPI?to?communicate?3?pins?are?required?to??
??interface
??Adafruit?invests?time?and?resources?providing?this?open?source?code?
??please?support?Adafruit?and?open-source?hardware?by?purchasing?
??products?from?Adafruit!

??Written?by?Limor?Fried/Ladyada?for?Adafruit?Industries.??
??BSD?license?all?text?above?must?be?included?in?any?redistribution
?****************************************************/

#include?“MAX31855.h“
#include?
#include?
#include?


MAX31855::MAX31855（int8_t?SCLK?int8_t?CS?int8_t?MISO）?{
??sclk?=?SCLK;
??cs?=?CS;
??miso?=?MISO;

??//define?pin?modes
??pinMode（cs?OUTPUT）;
??pinMode（sclk?OUTPUT）;?
??pinMode（miso?INPUT）;

??digitalWrite（cs?HIGH）;
}

int16_t?MAX31855::readCelsius（void）?{

??int32_t?v;

??v?=?spiread32（）;

??if?（v?&?0x7）?{
????//?uh?oh?a?serious?problem!
????return?NAN;?
??}

??//?get?rid?of?internal?temp?data?and?any?fault?bits
??v?>>=?18;

??//?pull?the?bottom?13?bits?off
??int16_t?temp?=?v?&?0x3FFF;

??//?check?sign?bit
??if?（v?&?0x2000）?
????temp?|=?0xC000;
??
??return?temp;
}

uint8_t?MAX31855::readError（）?{
??return?spiread32（）?&?0x7;
}


uint32_t?MAX31855::spiread32（void）?{?
??int?i;
??uint32_t?d?=?0;

??digitalWrite（sclk?LOW）;
????delayMicroseconds（150）;
??digitalWrite（cs?LOW）;
????delayMicroseconds（150）;

??for?（i=31;?i>=0;?i--）
??{
????digitalWrite（sclk?LOW）;
????delayMicroseconds（150）;
????d?<<=?1;
????if?（digitalRead（miso））?{
??????d?|=?1;
????}

????digitalWrite（sclk?HIGH）;
???delayMicroseconds（150）;
??}

??digitalWrite（cs?HIGH）;
??return?d;
}

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----
?????文件????????1832??2013-07-28?13:41??sketchbook\libraries\MAX31855\MAX31855.cpp
?????文件?????????955??2013-07-28?13:48??sketchbook\libraries\MAX31855\MAX31855.h