LaserMon-TEC.cpp

00001 
00002 // ----------------------------------------------------------------------
00003 // LaserMon-TEC.cpp
00004 //
00005 // Fredric L. Rice, June 2019
00006 //
00007 // ----------------------------------------------------------------------
00008 
00009 #include "mbed.h"                   // The mbed operating system
00010 #include "LCD_DISCO_F429ZI.h"       // For controlling the LCD
00011 #include "TS_DISCO_F429ZI.h"        // For controlling the touch screen
00012 #include "LaserMon-Main.h"          // For data exported to us
00013 #include "LaserMon-TEC.h"           // Always include ourself
00014 
00015 // ----------------------------------------------------------------------
00016 // Local data storage
00017 //
00018 // ----------------------------------------------------------------------
00019 
00020     // We bring in the TEC voltage to scan what it is
00021     static AnalogIn st_TECInput(TEC_VOLTAGE_IN);
00022     
00023     // We store the last ten TEC readings and keep a running average
00024     // of the last ten so that the main module may find out what the
00025     // average is and display it
00026     static uint16_t u16_TECHistory[TEC_HISTORY_COUNT_MAX];
00027     static uint8_t  u8_TECHistoryCount;
00028     static uint16_t u16_TECHistoryRunningAverage;
00029     
00030 // ----------------------------------------------------------------------
00031 // TECGetLastTenAverage()
00032 //
00033 // ----------------------------------------------------------------------
00034 uint16_t TECGetLastTenAverage(void)
00035 {
00036     return u16_TECHistoryRunningAverage;
00037 }
00038 
00039 // ----------------------------------------------------------------------
00040 //
00041 //
00042 // ----------------------------------------------------------------------
00043 void TECThread(void)
00044 {
00045     uint16_t u16_TECVoltage  = 0;
00046     float    f_rawTECVoltage = 0.0f;
00047     
00048     // Get the current voltage
00049     f_rawTECVoltage = st_TECInput.read() * 3.3f;
00050     
00051     // The TEC voltage is converted from a floating point in to
00052     // 16 bit value with the value after the decimal moved to
00053     // the right by two decimal place
00054     u16_TECVoltage = (uint16_t)(f_rawTECVoltage * 100.0f);
00055     
00056     // Inform the main module what the TEC voltage is
00057     LaserMonMainInformTECVoltage(u16_TECVoltage);
00058     
00059     // Do we have lessd than our TEC history values stored so far?
00060     if (u8_TECHistoryCount < TEC_HISTORY_COUNT_MAX)
00061     {
00062         // Since we have fewer than our maximum history, store it
00063         u16_TECHistory[u8_TECHistoryCount++] = u16_TECVoltage;
00064     }
00065     else
00066     {
00067 #if 1
00068         // Discard the oldest history value that we have
00069         for (uint8_t u8_thisValue = 1; u8_thisValue < TEC_HISTORY_COUNT_MAX; u8_thisValue++)
00070         {
00071             // Move the history value over to the left once
00072             u16_TECHistory[u8_thisValue] = u16_TECHistory[u8_thisValue - 1];
00073         }
00074         
00075         // Now store the latest value in to the history array
00076         u16_TECHistory[TEC_HISTORY_COUNT_MAX - 1] = u16_TECVoltage;
00077 #endif
00078     }
00079     
00080     // Compute the average TEC value
00081     u16_TECHistoryRunningAverage = 0;
00082     
00083     for (uint8_t u8_thisValue = 0; u8_thisValue < u8_TECHistoryCount; u8_thisValue++)
00084     {
00085         u16_TECHistoryRunningAverage += u16_TECHistory[u8_thisValue];
00086     }
00087     
00088     // Compute the average
00089     u16_TECHistoryRunningAverage /= u8_TECHistoryCount;
00090 }
00091 
00092 // ----------------------------------------------------------------------
00093 //
00094 //
00095 // ----------------------------------------------------------------------
00096 void TECInit(void)
00097 {
00098     // Initialize locally-held data
00099     u8_TECHistoryCount            = 0;
00100     u16_TECHistoryRunningAverage  = 0;
00101 }
00102 
00103 // End of file
00104