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-TestOutput.cpp@1:b9d4b9b8884c, 2019-06-14 (annotated)

Committer:
Damotclese
Date:
Fri Jun 14 21:11:31 2019 +0000
Revision:
1:b9d4b9b8884c
Parent:
0:1ebe7d222470
Child:
2:cbcf2695a4a1
Threat timing is very bad, a thread will average waking up once a millisecond when asked but there is a lot of slop. Instead of launching threads I instead call the "threads" from main() now.;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Damotclese 0:1ebe7d222470 1
Damotclese 0:1ebe7d222470 2 // ----------------------------------------------------------------------
Damotclese 0:1ebe7d222470 3 // LaserMon-TestOutput.cpp
Damotclese 0:1ebe7d222470 4 //
Damotclese 0:1ebe7d222470 5 // Fredric L. Rice, June 2019
Damotclese 0:1ebe7d222470 6 //
Damotclese 0:1ebe7d222470 7 // For testing purposes only, this test output wave form can be
Damotclese 0:1ebe7d222470 8 // jumpered in to the laser scan analog input signal so that the
Damotclese 0:1ebe7d222470 9 // software can be developed without the need for an ISEM.
Damotclese 0:1ebe7d222470 10 //
Damotclese 0:1ebe7d222470 11 // This thread will set an analog output signal to contain a porch
Damotclese 0:1ebe7d222470 12 // and then a ramp which increments from an initial step value up
Damotclese 0:1ebe7d222470 13 // to 3.3 volts, with the step being at 0.0 volts.
Damotclese 0:1ebe7d222470 14 //
Damotclese 0:1ebe7d222470 15 // ----------------------------------------------------------------------
Damotclese 0:1ebe7d222470 16
Damotclese 0:1ebe7d222470 17 #include "mbed.h" // The mbed operating system
Damotclese 0:1ebe7d222470 18 #include "LCD_DISCO_F429ZI.h" // For controlling the LCD
Damotclese 0:1ebe7d222470 19 #include "TS_DISCO_F429ZI.h" // For controlling the touch screen
Damotclese 0:1ebe7d222470 20 #include "LaserMon-Main.h" // For data exported to us
Damotclese 0:1ebe7d222470 21
Damotclese 0:1ebe7d222470 22 // ----------------------------------------------------------------------
Damotclese 0:1ebe7d222470 23 // We describe the shape of the waveform
Damotclese 0:1ebe7d222470 24 //
Damotclese 0:1ebe7d222470 25 // ----------------------------------------------------------------------
Damotclese 0:1ebe7d222470 26
Damotclese 1:b9d4b9b8884c 27 #define PORCH_WIDTH 10 // In milliseconds
Damotclese 1:b9d4b9b8884c 28 #define RAMP_WIDTH 250 // In milliseconds
Damotclese 0:1ebe7d222470 29 #define SCAN_LENGTH (PORCH_WIDTH + RAMP_WIDTH) // In milliseconds
Damotclese 1:b9d4b9b8884c 30 #define STEP_HEIGHT 1.8f // In volts
Damotclese 0:1ebe7d222470 31
Damotclese 0:1ebe7d222470 32 // ----------------------------------------------------------------------
Damotclese 0:1ebe7d222470 33 // Local data storage
Damotclese 0:1ebe7d222470 34 //
Damotclese 0:1ebe7d222470 35 // ----------------------------------------------------------------------
Damotclese 0:1ebe7d222470 36
Damotclese 0:1ebe7d222470 37 // We create an analog output
Damotclese 0:1ebe7d222470 38 static AnalogOut st_testSignalOut(TEST_SIGNAL_OUT);
Damotclese 1:b9d4b9b8884c 39
Damotclese 0:1ebe7d222470 40 // For diagnostic purposes to show that the test output is working
Damotclese 0:1ebe7d222470 41 static DigitalOut st_testSignalLED(LED1);
Damotclese 0:1ebe7d222470 42
Damotclese 0:1ebe7d222470 43 // To drive the porch
Damotclese 0:1ebe7d222470 44 static bool b_onPorch;
Damotclese 0:1ebe7d222470 45 static uint16_t u16_countRemaining;
Damotclese 0:1ebe7d222470 46
Damotclese 0:1ebe7d222470 47 // Across the ramp we increment the voltage starting from the
Damotclese 0:1ebe7d222470 48 // initial step up to 3.3 volts. Here we compute what the
Damotclese 0:1ebe7d222470 49 // incremental voltage should be so that when the ramp has
Damotclese 0:1ebe7d222470 50 // been completed, we end up at 3.3 volts, starting from the
Damotclese 0:1ebe7d222470 51 // initial step.
Damotclese 1:b9d4b9b8884c 52 static const float f_stepIncrement = ((3.3f - STEP_HEIGHT) / ((float)RAMP_WIDTH - 10.0f));
Damotclese 0:1ebe7d222470 53
Damotclese 0:1ebe7d222470 54 // ----------------------------------------------------------------------
Damotclese 0:1ebe7d222470 55 // Data that we will export globally
Damotclese 0:1ebe7d222470 56 //
Damotclese 0:1ebe7d222470 57 // ----------------------------------------------------------------------
Damotclese 0:1ebe7d222470 58
Damotclese 0:1ebe7d222470 59 // This is the value we maintain for ramp, adding to it the
Damotclese 0:1ebe7d222470 60 // incremental value every millisecond. We make it global so
Damotclese 0:1ebe7d222470 61 // that we can use the value for software development
Damotclese 0:1ebe7d222470 62 float f_rampVoltage = 0.0f;
Damotclese 0:1ebe7d222470 63
Damotclese 0:1ebe7d222470 64 // ----------------------------------------------------------------------
Damotclese 1:b9d4b9b8884c 65 // TestOutputThread()
Damotclese 0:1ebe7d222470 66 //
Damotclese 0:1ebe7d222470 67 // ----------------------------------------------------------------------
Damotclese 1:b9d4b9b8884c 68 void TestOutputThread(void)
Damotclese 0:1ebe7d222470 69 {
Damotclese 0:1ebe7d222470 70 static uint8_t u8_ledTimeoutTimer = 0;
Damotclese 0:1ebe7d222470 71
Damotclese 0:1ebe7d222470 72 // Do we need to turn the scan-completed LED off?
Damotclese 0:1ebe7d222470 73 if (u8_ledTimeoutTimer > 0)
Damotclese 0:1ebe7d222470 74 {
Damotclese 0:1ebe7d222470 75 // Count down the timer and see if it expired
Damotclese 0:1ebe7d222470 76 if (0 == --u8_ledTimeoutTimer)
Damotclese 0:1ebe7d222470 77 {
Damotclese 0:1ebe7d222470 78 // Turn the LED off now that 10 milliseconds has expired
Damotclese 0:1ebe7d222470 79 st_testSignalLED = 0;
Damotclese 0:1ebe7d222470 80 }
Damotclese 0:1ebe7d222470 81 }
Damotclese 0:1ebe7d222470 82
Damotclese 0:1ebe7d222470 83 // Are we stepping out the porch?
Damotclese 0:1ebe7d222470 84 if (true == b_onPorch)
Damotclese 0:1ebe7d222470 85 {
Damotclese 1:b9d4b9b8884c 86 // Drive the voltage down to zero for porch
Damotclese 1:b9d4b9b8884c 87 st_testSignalOut.write(f_rampVoltage = 0.0f);
Damotclese 1:b9d4b9b8884c 88
Damotclese 0:1ebe7d222470 89 // Is the porch time remaining still have some time?
Damotclese 0:1ebe7d222470 90 if (u16_countRemaining > 0)
Damotclese 0:1ebe7d222470 91 {
Damotclese 0:1ebe7d222470 92 // Yes, so count it down 1 millisecond and see if it expired
Damotclese 0:1ebe7d222470 93 if (0 == --u16_countRemaining)
Damotclese 0:1ebe7d222470 94 {
Damotclese 0:1ebe7d222470 95 // The porch time has expired so now we're on ramp
Damotclese 0:1ebe7d222470 96 b_onPorch = false;
Damotclese 0:1ebe7d222470 97
Damotclese 0:1ebe7d222470 98 // Set the ramp duration
Damotclese 0:1ebe7d222470 99 u16_countRemaining = RAMP_WIDTH;
Damotclese 0:1ebe7d222470 100
Damotclese 1:b9d4b9b8884c 101 // Set the next output voltage to the step height
Damotclese 1:b9d4b9b8884c 102 f_rampVoltage = (STEP_HEIGHT - f_stepIncrement);
Damotclese 0:1ebe7d222470 103 }
Damotclese 0:1ebe7d222470 104 }
Damotclese 0:1ebe7d222470 105 }
Damotclese 0:1ebe7d222470 106 else
Damotclese 0:1ebe7d222470 107 {
Damotclese 0:1ebe7d222470 108 // We are stepping out the ramp. We go from the step height
Damotclese 0:1ebe7d222470 109 // all the way up to 3.3 volts, incrementally across the
Damotclese 0:1ebe7d222470 110 // entire length of the ramp.
Damotclese 0:1ebe7d222470 111 //
Damotclese 0:1ebe7d222470 112 // Add the incremental value to the ramp voltage going out
Damotclese 0:1ebe7d222470 113 f_rampVoltage += f_stepIncrement;
Damotclese 0:1ebe7d222470 114
Damotclese 0:1ebe7d222470 115 // Write that voltage out
Damotclese 0:1ebe7d222470 116 st_testSignalOut.write(f_rampVoltage / 3.3f);
Damotclese 0:1ebe7d222470 117
Damotclese 0:1ebe7d222470 118 // Is there any more ramp to go out?
Damotclese 0:1ebe7d222470 119 if (u16_countRemaining > 0)
Damotclese 0:1ebe7d222470 120 {
Damotclese 0:1ebe7d222470 121 // There is so count it down
Damotclese 0:1ebe7d222470 122 u16_countRemaining--;
Damotclese 0:1ebe7d222470 123 }
Damotclese 0:1ebe7d222470 124
Damotclese 0:1ebe7d222470 125 // Is there no more ramp left to step out?
Damotclese 0:1ebe7d222470 126 if (0 == u16_countRemaining)
Damotclese 0:1ebe7d222470 127 {
Damotclese 0:1ebe7d222470 128 // No more ramp so we're back to porch
Damotclese 0:1ebe7d222470 129 b_onPorch = true;
Damotclese 0:1ebe7d222470 130
Damotclese 0:1ebe7d222470 131 // 1 millisecond from now we start counting down porch again
Damotclese 0:1ebe7d222470 132 u16_countRemaining = PORCH_WIDTH;
Damotclese 0:1ebe7d222470 133
Damotclese 0:1ebe7d222470 134 // At the completion of a scan we drive the LED
Damotclese 0:1ebe7d222470 135 st_testSignalLED = 1;
Damotclese 0:1ebe7d222470 136
Damotclese 0:1ebe7d222470 137 // We flash the LED for 10 milliseconds
Damotclese 0:1ebe7d222470 138 u8_ledTimeoutTimer = 10;
Damotclese 0:1ebe7d222470 139 }
Damotclese 0:1ebe7d222470 140 }
Damotclese 0:1ebe7d222470 141 }
Damotclese 0:1ebe7d222470 142
Damotclese 0:1ebe7d222470 143 // ----------------------------------------------------------------------
Damotclese 0:1ebe7d222470 144 // TestOutputInit()
Damotclese 0:1ebe7d222470 145 //
Damotclese 0:1ebe7d222470 146 // This function initializes this module and then launches the thread
Damotclese 0:1ebe7d222470 147 //
Damotclese 0:1ebe7d222470 148 // ----------------------------------------------------------------------
Damotclese 0:1ebe7d222470 149 void TestOutputInit(void)
Damotclese 0:1ebe7d222470 150 {
Damotclese 0:1ebe7d222470 151 // Initialize this module
Damotclese 0:1ebe7d222470 152 b_onPorch = true;
Damotclese 0:1ebe7d222470 153 u16_countRemaining = PORCH_WIDTH;
Damotclese 0:1ebe7d222470 154 }
Damotclese 0:1ebe7d222470 155
Damotclese 0:1ebe7d222470 156 // End of file
Damotclese 0:1ebe7d222470 157