Move master branch from from mios git repo

2014-01-23 00:23:15 +01:00
commit 609d9e5be9
352 changed files with 53418 additions and 0 deletions
@@ -0,0 +1,38 @@
+#include <spi.h>
+
+// MAX6675 connected to pin D9
+#define MAX6675_SELECT_PIN 8
+#define DESELECT_MAX6675 digitalWrite(MAX6675_SELECT_PIN, HIGH)
+#define SELECT_MAX6675 digitalWrite(MAX6675_SELECT_PIN, LOW)
+
+void setup()
+{
+  pinMode(MAX6675_SELECT_PIN, OUTPUT);
+  DESELECT_MAX6675;
+  setup_spi(SPI_MODE_1, SPI_MSB, SPI_NO_INTERRUPT, SPI_MSTR_CLK8);
+  Serial.begin(19200);
+}
+
+void loop()
+{
+  delay(500);
+
+  // select the device, wait > 100nS, read two bytes, deselect
+  SELECT_MAX6675;
+  delayMicroseconds(1);
+  unsigned char highByte = send_spi(0);
+  unsigned char lowByte = send_spi(0);
+  DESELECT_MAX6675;
+  
+  // if bit 3 is high thermocouple is unconnected
+  if (lowByte & (1<<2)) {
+    Serial.print("Not connected "); 
+    Serial.print(highByte, HEX); Serial.print(" ");
+    Serial.println(lowByte, HEX);
+  } else {
+    // temperature value is in bits 6-0 of highByte and 7-2 of lowByte
+    short value = (highByte << 5 | lowByte>>3);
+    // 1 bit is 0.25 degree 'divide' by 4 to show degrees
+    Serial.print(value/4); Serial.print("."); Serial.println(value%4 *25);
+  }
+}