Diff: max6675_3.cpp

Revision:

0:d68d5418c985

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/max6675_3.cpp	Thu Mar 19 04:45:23 2020 +0000
@@ -0,0 +1,42 @@
+
+#include <mbed.h>
+#include "max6675_3.h"
+
+max6675_3::max6675_3(SPI& _spi_3, PinName _ncs_3) : spi_3(_spi_3), ncs_3(_ncs_3) {
+
+}
+
+float max6675_3::read_temp_3() {
+    short value_3 = 0;
+    float temp_3 = 0;
+    
+    uint8_t highByte_3=0;
+    uint8_t lowByte_3=0;
+    
+    select_3();
+    wait(.25); //This delay is needed else it does'nt seem to update the temp
+
+    highByte_3 = spi_3.write(0);
+    lowByte_3 = spi_3.write(0);
+    deselect_3();
+
+
+    if (lowByte_3 & (1<<2)) {
+        error("No Probe");
+    } else {
+        value_3 = (highByte_3 << 5 | lowByte_3>>3);
+    }
+
+    temp_3 = (value_3*0.25); // Multiply the value by 0.25 to get temp in ˚C or
+                         //  * (9.0/5.0)) + 32.0;   // Convert value to ˚F (ensure proper floats!)
+
+return temp_3;
+}
+
+void max6675_3::select_3() {
+    ncs_3 = 0;
+}
+
+void max6675_3::deselect_3() {
+    ncs_3 = 1;
+}