初始化提交

arduino-cli/libraries/MAX6675/max6675.cpp

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+// this library is public domain. enjoy!
+// www.ladyada.net/learn/sensors/thermocouple
+
+#ifdef __AVR
+  #include <avr/pgmspace.h>
+#elif defined(ESP8266)
+  #include <pgmspace.h>
+#endif
+#include <util/delay.h>
+#include <stdlib.h>
+#include "max6675.h"
+
+MAX6675::MAX6675(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);
+}
+double MAX6675::readCelsius(void) {
+
+  uint16_t v;
+
+  digitalWrite(cs, LOW);
+  _delay_ms(1);
+
+  v = spiread();
+  v <<= 8;
+  v |= spiread();
+
+  digitalWrite(cs, HIGH);
+
+  if (v & 0x4) {
+    // uh oh, no thermocouple attached!
+    return NAN; 
+    //return -100;
+  }
+
+  v >>= 3;
+
+  return v*0.25;
+}
+
+double MAX6675::readFahrenheit(void) {
+  return readCelsius() * 9.0/5.0 + 32;
+}
+
+byte MAX6675::spiread(void) { 
+  int i;
+  byte d = 0;
+
+  for (i=7; i>=0; i--)
+  {
+    digitalWrite(sclk, LOW);
+    _delay_ms(1);
+    if (digitalRead(miso)) {
+      //set the bit to 0 no matter what
+      d |= (1 << i);
+    }
+
+    digitalWrite(sclk, HIGH);
+    _delay_ms(1);
+  }
+
+  return d;
+}