Fredric Rice / Mbed 2 deprecated NextGen-LaserMonitor

Generates a test signal on an AnalogOut and monitors a signal on an AnalogIn, plotting the test signal or the actual signal depending on a conditional compile. The wait() and wait_ms() library calls for this board are highly inaccurate so a new function is provided to wait for X number of milliseconds -- which is not very accurate.

Dependencies:   LCD_DISCO_F429ZI mbed TS_DISCO_F429ZI mbed-os BSP_DISCO_F429ZI

LaserMon-ScanInput.cpp@0:1ebe7d222470, 2019-06-10 (annotated)

Committer:
Damotclese
Date:
Mon Jun 10 17:10:01 2019 +0000
Revision:
0:1ebe7d222470
Child:
1:b9d4b9b8884c
Checking in the project for safe keeping;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Damotclese 0:1ebe7d222470 1
Damotclese 0:1ebe7d222470 2 // ----------------------------------------------------------------------
Damotclese 0:1ebe7d222470 3 // LaserMon-ScanInput.cpp
Damotclese 0:1ebe7d222470 4 //
Damotclese 0:1ebe7d222470 5 // Fredric L. Rice, June 2019
Damotclese 0:1ebe7d222470 6 //
Damotclese 0:1ebe7d222470 7 // ----------------------------------------------------------------------
Damotclese 0:1ebe7d222470 8
Damotclese 0:1ebe7d222470 9 #include "mbed.h" // The mbed operating system
Damotclese 0:1ebe7d222470 10 #include "LCD_DISCO_F429ZI.h" // For controlling the LCD
Damotclese 0:1ebe7d222470 11 #include "TS_DISCO_F429ZI.h" // For controlling the touch screen
Damotclese 0:1ebe7d222470 12 #include "LaserMon-Main.h" // For data exported to us
Damotclese 0:1ebe7d222470 13 #include "LaserMon-TestOutput.h" // For test signal
Damotclese 0:1ebe7d222470 14
Damotclese 0:1ebe7d222470 15 // ----------------------------------------------------------------------
Damotclese 0:1ebe7d222470 16 // Options, defined constants, and MACROs
Damotclese 0:1ebe7d222470 17 //
Damotclese 0:1ebe7d222470 18 // ----------------------------------------------------------------------
Damotclese 0:1ebe7d222470 19
Damotclese 0:1ebe7d222470 20 #define WANT_TEST_SIGNAL 1
Damotclese 0:1ebe7d222470 21
Damotclese 0:1ebe7d222470 22 // ----------------------------------------------------------------------
Damotclese 0:1ebe7d222470 23 // Local data storage
Damotclese 0:1ebe7d222470 24 //
Damotclese 0:1ebe7d222470 25 // ----------------------------------------------------------------------
Damotclese 0:1ebe7d222470 26
Damotclese 0:1ebe7d222470 27 // We create an analog input
Damotclese 0:1ebe7d222470 28 static AnalogIn st_scanInput(LASER_SCAN_IN);
Damotclese 0:1ebe7d222470 29
Damotclese 0:1ebe7d222470 30 // We will be creating a thread
Damotclese 0:1ebe7d222470 31 static Thread st_scanInputThread;
Damotclese 0:1ebe7d222470 32
Damotclese 0:1ebe7d222470 33 // For diagnostic purposes to show that the Laser Scan is operating
Damotclese 0:1ebe7d222470 34 static DigitalOut st_scanInputLED(LED2);
Damotclese 0:1ebe7d222470 35
Damotclese 0:1ebe7d222470 36 // There are LCD_HEIGHT possible scan lines with a height of
Damotclese 0:1ebe7d222470 37 // LCD_WIDTH -- yes, the defined constant names are swapped
Damotclese 0:1ebe7d222470 38 // because we plot sideways.
Damotclese 0:1ebe7d222470 39 //
Damotclese 0:1ebe7d222470 40 // This value contains the next scan line number to plot
Damotclese 0:1ebe7d222470 41 static uint16_t u16_nextScanLine;
Damotclese 0:1ebe7d222470 42
Damotclese 0:1ebe7d222470 43 static uint16_t u16_lastHeight = 0;
Damotclese 0:1ebe7d222470 44
Damotclese 0:1ebe7d222470 45 bool b_done = false;
Damotclese 0:1ebe7d222470 46
Damotclese 0:1ebe7d222470 47 // ----------------------------------------------------------------------
Damotclese 0:1ebe7d222470 48 // ScanInputPlotThisValue()
Damotclese 0:1ebe7d222470 49 //
Damotclese 0:1ebe7d222470 50 // What percentage of LCD_HEIGHT is the voltage? We need to scale 0 to
Damotclese 0:1ebe7d222470 51 // 3.3 volts across LCD_HEIGHT, with 0 being zero, and 3.3 volts being
Damotclese 0:1ebe7d222470 52 // LCD_HEIGHT.
Damotclese 0:1ebe7d222470 53 //
Damotclese 0:1ebe7d222470 54 // We compute the percentage of 3.3 volts that the input signal is
Damotclese 0:1ebe7d222470 55 // currently showing, then we compute that percentage of LCD_HEIGHT to
Damotclese 0:1ebe7d222470 56 // determine how many pixels on a scan line that percentage is. That
Damotclese 0:1ebe7d222470 57 // gives us the height of the plot line while u16_nextScanLine gives
Damotclese 0:1ebe7d222470 58 // us the line to plot it on.
Damotclese 0:1ebe7d222470 59 //
Damotclese 0:1ebe7d222470 60 // This is easy because the value passed to this function is a value
Damotclese 0:1ebe7d222470 61 // from 0.0 to 1.0 which is a percentage of 3.3 volts, so we use the
Damotclese 0:1ebe7d222470 62 // value against LCD_HEIGHT to yield the percentage of height.
Damotclese 0:1ebe7d222470 63 //
Damotclese 0:1ebe7d222470 64 // ----------------------------------------------------------------------
Damotclese 0:1ebe7d222470 65 static void ScanInputPlotThisValue(float f_analogValue)
Damotclese 0:1ebe7d222470 66 {
Damotclese 0:1ebe7d222470 67 // Compute the percentage of LCD height
Damotclese 0:1ebe7d222470 68 uint16_t u16_pixelHeight = ((f_analogValue / 3.8f) * LCD_HEIGHT);
Damotclese 0:1ebe7d222470 69
Damotclese 0:1ebe7d222470 70 u16_pixelHeight /= 2;
Damotclese 0:1ebe7d222470 71 u16_pixelHeight += 10;
Damotclese 0:1ebe7d222470 72
Damotclese 0:1ebe7d222470 73 // Plot the pixel
Damotclese 0:1ebe7d222470 74 if (u16_nextScanLine > 0)
Damotclese 0:1ebe7d222470 75 {
Damotclese 0:1ebe7d222470 76 st_lcd.DrawLine(u16_pixelHeight, u16_nextScanLine, u16_lastHeight, u16_nextScanLine - 1);
Damotclese 0:1ebe7d222470 77 }
Damotclese 0:1ebe7d222470 78 else
Damotclese 0:1ebe7d222470 79 {
Damotclese 0:1ebe7d222470 80 st_lcd.DrawPixel(u16_pixelHeight, u16_nextScanLine, LCD_COLOR_BLACK);
Damotclese 0:1ebe7d222470 81 }
Damotclese 0:1ebe7d222470 82
Damotclese 0:1ebe7d222470 83 u16_lastHeight = u16_pixelHeight;
Damotclese 0:1ebe7d222470 84
Damotclese 0:1ebe7d222470 85 // Increment the scan line and see if it wrapped
Damotclese 0:1ebe7d222470 86 if (++u16_nextScanLine >= LCD_WIDTH)
Damotclese 0:1ebe7d222470 87 {
Damotclese 0:1ebe7d222470 88 u16_nextScanLine = 40;
Damotclese 0:1ebe7d222470 89
Damotclese 0:1ebe7d222470 90 b_done = true;
Damotclese 0:1ebe7d222470 91 }
Damotclese 0:1ebe7d222470 92 }
Damotclese 0:1ebe7d222470 93
Damotclese 0:1ebe7d222470 94 // ----------------------------------------------------------------------
Damotclese 0:1ebe7d222470 95 // ScanInputGetNextValue()
Damotclese 0:1ebe7d222470 96 //
Damotclese 0:1ebe7d222470 97 //
Damotclese 0:1ebe7d222470 98 // ----------------------------------------------------------------------
Damotclese 0:1ebe7d222470 99 static void ScanInputGetNextValue(void)
Damotclese 0:1ebe7d222470 100 {
Damotclese 0:1ebe7d222470 101 // Get the current analog input value and convert to volts
Damotclese 0:1ebe7d222470 102 float f_analogValue = st_scanInput.read() * 3.3f;
Damotclese 0:1ebe7d222470 103
Damotclese 0:1ebe7d222470 104 #if WANT_TEST_SIGNAL
Damotclese 0:1ebe7d222470 105 // Use the test output signal voltage instead
Damotclese 0:1ebe7d222470 106 f_analogValue = f_rampVoltage;
Damotclese 0:1ebe7d222470 107 #endif
Damotclese 0:1ebe7d222470 108
Damotclese 0:1ebe7d222470 109 // Call the function which plots this value
Damotclese 0:1ebe7d222470 110 ScanInputPlotThisValue(f_analogValue);
Damotclese 0:1ebe7d222470 111 }
Damotclese 0:1ebe7d222470 112
Damotclese 0:1ebe7d222470 113 // ----------------------------------------------------------------------
Damotclese 0:1ebe7d222470 114 // ScanInputThread()
Damotclese 0:1ebe7d222470 115 //
Damotclese 0:1ebe7d222470 116 // This thread wakes up every 1 millisecond to drive the input of the
Damotclese 0:1ebe7d222470 117 // signal coming in on the analog input -- or if it's enabled, to drive
Damotclese 0:1ebe7d222470 118 // the input based on the test signal for diagnostic and software
Damotclese 0:1ebe7d222470 119 // development use.
Damotclese 0:1ebe7d222470 120 //
Damotclese 0:1ebe7d222470 121 // ----------------------------------------------------------------------
Damotclese 0:1ebe7d222470 122 static void ScanInputThread(void)
Damotclese 0:1ebe7d222470 123 {
Damotclese 0:1ebe7d222470 124 // This thread goes in to a forever loop waking up once a millisecond
Damotclese 0:1ebe7d222470 125 while(true)
Damotclese 0:1ebe7d222470 126 {
Damotclese 0:1ebe7d222470 127 if (false == b_done)
Damotclese 0:1ebe7d222470 128 {
Damotclese 0:1ebe7d222470 129 // Drive the input scanner
Damotclese 0:1ebe7d222470 130 ScanInputGetNextValue();
Damotclese 0:1ebe7d222470 131 }
Damotclese 0:1ebe7d222470 132
Damotclese 0:1ebe7d222470 133 // Wait for 1 millisecond
Damotclese 0:1ebe7d222470 134 accurate_wait_ms(1);
Damotclese 0:1ebe7d222470 135 }
Damotclese 0:1ebe7d222470 136 }
Damotclese 0:1ebe7d222470 137
Damotclese 0:1ebe7d222470 138 // ----------------------------------------------------------------------
Damotclese 0:1ebe7d222470 139 // ScanInputInit()
Damotclese 0:1ebe7d222470 140 //
Damotclese 0:1ebe7d222470 141 // ----------------------------------------------------------------------
Damotclese 0:1ebe7d222470 142 void ScanInputInit(void)
Damotclese 0:1ebe7d222470 143 {
Damotclese 0:1ebe7d222470 144 // Start out with the LED turned ON
Damotclese 0:1ebe7d222470 145 st_scanInputLED = 1;
Damotclese 0:1ebe7d222470 146
Damotclese 0:1ebe7d222470 147 // Initialize locally-held variables
Damotclese 0:1ebe7d222470 148 u16_nextScanLine = 40;
Damotclese 0:1ebe7d222470 149
Damotclese 0:1ebe7d222470 150 // Launch the thread
Damotclese 0:1ebe7d222470 151 st_scanInputThread.start(ScanInputThread);
Damotclese 0:1ebe7d222470 152 }
Damotclese 0:1ebe7d222470 153
Damotclese 0:1ebe7d222470 154 // End of file
Damotclese 0:1ebe7d222470 155