added new max1227 helper functions

mission/devices/max1227.cpp

@@ -1,5 +1,7 @@
 #include "max1227.h"
 
+#include <cstring>
+
 uint8_t max1227::buildConvByte(ScanModes scanMode, uint8_t channel, bool readTemp) {
   return (1 << 7) | (channel << 3) | (scanMode << 1) | readTemp;
 }
@@ -26,3 +28,11 @@ void max1227::prepareExternallyClockedRead0ToN(uint8_t *spiBuf, uint8_t n, size_
   spiBuf[(n + 1) * 2] = 0x00;
   sz = (n + 1) * 2 + 1;
 }
+
+void max1227::prepareExternallyClockedTemperatureRead(uint8_t *spiBuf, size_t &sz) {
+  spiBuf[0] = buildConvByte(ScanModes::N_ONCE, 0, true);
+  std::memset(spiBuf + 1, 0, 24);
+  sz = 25;
+}
+
+float max1227::getTemperature(int16_t temp) { return static_cast<float>(temp) * 0.125; }