Diff: LaserMon-TEC.cpp

Revision:

2:cbcf2695a4a1

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/LaserMon-TEC.cpp	Mon Jun 17 17:11:07 2019 +0000
@@ -0,0 +1,104 @@
+
+// ----------------------------------------------------------------------
+// LaserMon-TEC.cpp
+//
+// Fredric L. Rice, June 2019
+//
+// ----------------------------------------------------------------------
+
+#include "mbed.h"                   // The mbed operating system
+#include "LCD_DISCO_F429ZI.h"       // For controlling the LCD
+#include "TS_DISCO_F429ZI.h"        // For controlling the touch screen
+#include "LaserMon-Main.h"          // For data exported to us
+#include "LaserMon-TEC.h"           // Always include ourself
+
+// ----------------------------------------------------------------------
+// Local data storage
+//
+// ----------------------------------------------------------------------
+
+    // We bring in the TEC voltage to scan what it is
+    static AnalogIn st_TECInput(TEC_VOLTAGE_IN);
+    
+    // We store the last ten TEC readings and keep a running average
+    // of the last ten so that the main module may find out what the
+    // average is and display it
+    static uint16_t u16_TECHistory[TEC_HISTORY_COUNT_MAX];
+    static uint8_t  u8_TECHistoryCount;
+    static uint16_t u16_TECHistoryRunningAverage;
+    
+// ----------------------------------------------------------------------
+// TECGetLastTenAverage()
+//
+// ----------------------------------------------------------------------
+uint16_t TECGetLastTenAverage(void)
+{
+    return u16_TECHistoryRunningAverage;
+}
+
+// ----------------------------------------------------------------------
+//
+//
+// ----------------------------------------------------------------------
+void TECThread(void)
+{
+    uint16_t u16_TECVoltage  = 0;
+    float    f_rawTECVoltage = 0.0f;
+    
+    // Get the current voltage
+    f_rawTECVoltage = st_TECInput.read() * 3.3f;
+    
+    // The TEC voltage is converted from a floating point in to
+    // 16 bit value with the value after the decimal moved to
+    // the right by two decimal place
+    u16_TECVoltage = (uint16_t)(f_rawTECVoltage * 100.0f);
+    
+    // Inform the main module what the TEC voltage is
+    LaserMonMainInformTECVoltage(u16_TECVoltage);
+    
+    // Do we have lessd than our TEC history values stored so far?
+    if (u8_TECHistoryCount < TEC_HISTORY_COUNT_MAX)
+    {
+        // Since we have fewer than our maximum history, store it
+        u16_TECHistory[u8_TECHistoryCount++] = u16_TECVoltage;
+    }
+    else
+    {
+#if 1
+        // Discard the oldest history value that we have
+        for (uint8_t u8_thisValue = 1; u8_thisValue < TEC_HISTORY_COUNT_MAX; u8_thisValue++)
+        {
+            // Move the history value over to the left once
+            u16_TECHistory[u8_thisValue] = u16_TECHistory[u8_thisValue - 1];
+        }
+        
+        // Now store the latest value in to the history array
+        u16_TECHistory[TEC_HISTORY_COUNT_MAX - 1] = u16_TECVoltage;
+#endif
+    }
+    
+    // Compute the average TEC value
+    u16_TECHistoryRunningAverage = 0;
+    
+    for (uint8_t u8_thisValue = 0; u8_thisValue < u8_TECHistoryCount; u8_thisValue++)
+    {
+        u16_TECHistoryRunningAverage += u16_TECHistory[u8_thisValue];
+    }
+    
+    // Compute the average
+    u16_TECHistoryRunningAverage /= u8_TECHistoryCount;
+}
+
+// ----------------------------------------------------------------------
+//
+//
+// ----------------------------------------------------------------------
+void TECInit(void)
+{
+    // Initialize locally-held data
+    u8_TECHistoryCount            = 0;
+    u16_TECHistoryRunningAverage  = 0;
+}
+
+// End of file
+