Steven Kay / Mbed 2 deprecated Embedded_Software_Assignment_2

Example software for a Cyclic Executive

Dependencies:   MCP23017 SDFileSystem WattBob_TextLCD mbed

Tasks.cpp@10:c0531edf4850, 2016-03-02 (annotated)

Committer:
sk398
Date:
Wed Mar 02 13:38:27 2016 +0000
Revision:
10:c0531edf4850
Parent:
9:46408a8dea0c 
Final version - all operational

Who changed what in which revision?

UserRevisionLine numberNew contents of line
sk398 4:b85bc0d810e1 1 /* #####################################################################
sk398 4:b85bc0d810e1 2 Tasks.cpp
sk398 4:b85bc0d810e1 3 ---------
sk398 4:b85bc0d810e1 4
sk398 4:b85bc0d810e1 5 Embedded Software - Assignment 2
sk398 4:b85bc0d810e1 6 --------------------------------
sk398 4:b85bc0d810e1 7
sk398 4:b85bc0d810e1 8 Written by: Steven Kay
sk398 4:b85bc0d810e1 9
sk398 4:b85bc0d810e1 10 Date: February 2016
sk398 4:b85bc0d810e1 11
sk398 10:c0531edf4850 12 Function: This code defines the operations of all of the
sk398 10:c0531edf4850 13 methods, or tasks used by the cyclic executive
sk398 10:c0531edf4850 14
sk398 4:b85bc0d810e1 15 ##################################################################### */
sk398 2:22ebabd78084 16
sk398 1:221d677fe0d3 17 #include "mbed.h"
sk398 1:221d677fe0d3 18 #include "Tasks.h"
sk398 1:221d677fe0d3 19
sk398 1:221d677fe0d3 20 /* ==================================== Task 1 ==================================== */
sk398 1:221d677fe0d3 21 Task1::Task1(PinName squareWaveInPin)
sk398 1:221d677fe0d3 22 {
sk398 10:c0531edf4850 23 // Construct new DigitalIn object using the pin number provided
sk398 9:46408a8dea0c 24 _squareWaveIn = new DigitalIn(squareWaveInPin);
sk398 1:221d677fe0d3 25 }
sk398 1:221d677fe0d3 26
sk398 4:b85bc0d810e1 27 void Task1::MeasureFrequency()
sk398 4:b85bc0d810e1 28 {
sk398 10:c0531edf4850 29 // If pulse is initially low, wait until rising edge before starting timer
sk398 10:c0531edf4850 30 if(_squareWaveIn -> read() == LOW)
sk398 10:c0531edf4850 31 {
sk398 10:c0531edf4850 32 while(_squareWaveIn -> read() == LOW)
sk398 10:c0531edf4850 33 {
sk398 10:c0531edf4850 34 wait_us(SAMPLE_FREQ);
sk398 10:c0531edf4850 35 }
sk398 10:c0531edf4850 36
sk398 10:c0531edf4850 37 _Task1Timer.start();
sk398 10:c0531edf4850 38
sk398 10:c0531edf4850 39 // Once timer has started, wait until falling edge before breaking and
sk398 10:c0531edf4850 40 // stopping timer
sk398 10:c0531edf4850 41 while(_squareWaveIn -> read() == HIGH)
sk398 10:c0531edf4850 42 {
sk398 10:c0531edf4850 43 wait_us(SAMPLE_FREQ);
sk398 10:c0531edf4850 44 }
sk398 10:c0531edf4850 45 }
sk398 10:c0531edf4850 46
sk398 10:c0531edf4850 47 // If pulse is initially high, wait until falling edge before starting timer
sk398 10:c0531edf4850 48 else if(_squareWaveIn -> read()== HIGH)
sk398 10:c0531edf4850 49 {
sk398 10:c0531edf4850 50 while(_squareWaveIn -> read() == HIGH)
sk398 10:c0531edf4850 51 {
sk398 10:c0531edf4850 52 wait_us(SAMPLE_FREQ);
sk398 10:c0531edf4850 53 }
sk398 10:c0531edf4850 54
sk398 10:c0531edf4850 55 _Task1Timer.start();
sk398 10:c0531edf4850 56
sk398 10:c0531edf4850 57 // Once timer has started, wait until rising edge before breaking and
sk398 10:c0531edf4850 58 // stopping timer
sk398 10:c0531edf4850 59 while(_squareWaveIn -> read() == LOW)
sk398 10:c0531edf4850 60 {
sk398 10:c0531edf4850 61 wait_us(SAMPLE_FREQ);
sk398 10:c0531edf4850 62 }
sk398 10:c0531edf4850 63 }
sk398 10:c0531edf4850 64
sk398 10:c0531edf4850 65 // Stop timer after breaking while loop conditions
sk398 4:b85bc0d810e1 66 _Task1Timer.stop();
sk398 10:c0531edf4850 67
sk398 10:c0531edf4850 68 // Calculate frequency from timer (either high or low time)
sk398 10:c0531edf4850 69 // do this by multiplying the time by 2 (high + low time) and dividing it,
sk398 10:c0531edf4850 70 // converting it to a frequency
sk398 10:c0531edf4850 71 // Store frequency in private class field
sk398 10:c0531edf4850 72 Task1::measuredFrequency = (1000000/(2*_Task1Timer.read_us()));
sk398 10:c0531edf4850 73
sk398 10:c0531edf4850 74 // Reset timer
sk398 4:b85bc0d810e1 75 _Task1Timer.reset();
sk398 10:c0531edf4850 76
sk398 4:b85bc0d810e1 77 }
sk398 4:b85bc0d810e1 78
sk398 4:b85bc0d810e1 79 int Task1::ReadFrequency()
sk398 4:b85bc0d810e1 80 {
sk398 10:c0531edf4850 81 // Run private method to calculate the frequency
sk398 10:c0531edf4850 82 MeasureFrequency();
sk398 4:b85bc0d810e1 83
sk398 10:c0531edf4850 84 // Return private field showing the newest frequency calculation
sk398 4:b85bc0d810e1 85 return measuredFrequency;
sk398 4:b85bc0d810e1 86 }
sk398 1:221d677fe0d3 87
sk398 1:221d677fe0d3 88 /* ==================================== Task 2 ==================================== */
sk398 1:221d677fe0d3 89 Task2::Task2(PinName digitalInCheckPin)
sk398 1:221d677fe0d3 90 {
sk398 10:c0531edf4850 91 //Construct new DigitalIn object from provided pin
sk398 3:c611b9bb5770 92 _digitalInCheck = new DigitalIn(digitalInCheckPin);
sk398 1:221d677fe0d3 93 }
sk398 3:c611b9bb5770 94
sk398 3:c611b9bb5770 95 bool Task2::digitalInState()
sk398 3:c611b9bb5770 96 {
sk398 10:c0531edf4850 97 // Check state of pin, returning a TRUE if high, false if LOW
sk398 3:c611b9bb5770 98 if(_digitalInCheck -> read())
sk398 3:c611b9bb5770 99 {
sk398 3:c611b9bb5770 100 return TRUE;
sk398 3:c611b9bb5770 101 }
sk398 3:c611b9bb5770 102 else
sk398 3:c611b9bb5770 103 {
sk398 3:c611b9bb5770 104 return FALSE;
sk398 3:c611b9bb5770 105 }
sk398 3:c611b9bb5770 106 }
sk398 3:c611b9bb5770 107
sk398 1:221d677fe0d3 108
sk398 1:221d677fe0d3 109 /* ==================================== Task 3 ==================================== */
sk398 1:221d677fe0d3 110 Task3::Task3(PinName WatchdogPin)
sk398 1:221d677fe0d3 111 {
sk398 10:c0531edf4850 112 // Construct new DigitalOut object using provided pin
sk398 1:221d677fe0d3 113 _Watchdog = new DigitalOut(WatchdogPin);
sk398 1:221d677fe0d3 114 }
sk398 1:221d677fe0d3 115
sk398 1:221d677fe0d3 116 void Task3::OutputWatchdogPulse()
sk398 1:221d677fe0d3 117 {
sk398 10:c0531edf4850 118 // Produce a 15ms pulse when method called
sk398 1:221d677fe0d3 119 _Watchdog -> write(HIGH);
sk398 1:221d677fe0d3 120 wait_ms(WATCHDOG_PULSE_WIDTH);
sk398 1:221d677fe0d3 121 _Watchdog -> write(LOW);
sk398 1:221d677fe0d3 122 }
sk398 1:221d677fe0d3 123
sk398 1:221d677fe0d3 124
sk398 3:c611b9bb5770 125 /* ==================================== Task 4 ==================================== */
sk398 3:c611b9bb5770 126 Task4::Task4(PinName Analog1Pin,PinName Analog2Pin)
sk398 3:c611b9bb5770 127 {
sk398 10:c0531edf4850 128 // Construct new AnalogIn objects from provided pins
sk398 3:c611b9bb5770 129 _AnalogIn1 = new AnalogIn(Analog1Pin);
sk398 3:c611b9bb5770 130 _AnalogIn2 = new AnalogIn(Analog2Pin);
sk398 3:c611b9bb5770 131 }
sk398 3:c611b9bb5770 132
sk398 3:c611b9bb5770 133 float *Task4::returnAnalogReadings()
sk398 3:c611b9bb5770 134 {
sk398 10:c0531edf4850 135 // Declare local scope fields to retain current totals
sk398 3:c611b9bb5770 136 float readBuffer_1 = 0.0;
sk398 3:c611b9bb5770 137 float readBuffer_2 = 0.0;
sk398 3:c611b9bb5770 138
sk398 10:c0531edf4850 139 // Read 4 samples from AnalogIn pins
sk398 3:c611b9bb5770 140 for(int readCount = 0;readCount < NUM_ANALOG_SAMPLES; readCount++)
sk398 3:c611b9bb5770 141 {
sk398 10:c0531edf4850 142 // Add to readBuffer with new weighted reading.
sk398 10:c0531edf4850 143 // 3.3v due to supply voltage
sk398 10:c0531edf4850 144 readBuffer_1 += ((_AnalogIn1 -> read())*V_SUPPLY);
sk398 10:c0531edf4850 145 readBuffer_2 += ((_AnalogIn2 -> read())*V_SUPPLY);
sk398 3:c611b9bb5770 146 }
sk398 3:c611b9bb5770 147
sk398 10:c0531edf4850 148 // Construct local buffer
sk398 10:c0531edf4850 149 float outputBuffer[2];
sk398 10:c0531edf4850 150
sk398 10:c0531edf4850 151 // Construct elements in outputBuffer array as averaged sample
sk398 3:c611b9bb5770 152 outputBuffer[0] = readBuffer_1/NUM_ANALOG_SAMPLES;
sk398 4:b85bc0d810e1 153 outputBuffer[1] = readBuffer_2/NUM_ANALOG_SAMPLES;
sk398 3:c611b9bb5770 154
sk398 10:c0531edf4850 155 // Construct pointer to return the initial element of the outputBuffer
sk398 4:b85bc0d810e1 156 float *outputBufferPtr =&outputBuffer[0];
sk398 10:c0531edf4850 157
sk398 10:c0531edf4850 158 // Return pointer to first element of outputBuffer
sk398 3:c611b9bb5770 159 return outputBufferPtr;
sk398 3:c611b9bb5770 160 }
sk398 4:b85bc0d810e1 161
sk398 4:b85bc0d810e1 162 /* ==================================== Task 5 ==================================== */
sk398 5:250f51c80ac1 163 Task5::Task5(PinName sda, PinName scl, int address)
sk398 4:b85bc0d810e1 164 {
sk398 10:c0531edf4850 165 // Declare and initialise the LCD display
sk398 5:250f51c80ac1 166 _par_port = new MCP23017(sda,scl,address);
sk398 5:250f51c80ac1 167 _lcd = new WattBob_TextLCD(_par_port);
sk398 5:250f51c80ac1 168 _par_port -> write_bit(1,BL_BIT);
sk398 4:b85bc0d810e1 169 }
sk398 4:b85bc0d810e1 170
sk398 6:ceda53939eb8 171 void Task5::updateDisplay( int task1Param,
sk398 6:ceda53939eb8 172 int task2Param,
sk398 6:ceda53939eb8 173 int errorState,
sk398 6:ceda53939eb8 174 float task4Channel1,
sk398 6:ceda53939eb8 175 float task4Channel2 )
sk398 5:250f51c80ac1 176 {
sk398 10:c0531edf4850 177 // Print standard expression using input fields
sk398 5:250f51c80ac1 178 _lcd -> cls();
sk398 5:250f51c80ac1 179 _lcd -> locate(0,0);
sk398 6:ceda53939eb8 180 _lcd -> printf("F-%4dHz S1-%d E%d",task1Param,task2Param,errorState);
sk398 5:250f51c80ac1 181 _lcd -> locate(1,0);
sk398 5:250f51c80ac1 182 _lcd -> printf("C1-%1.2f C2-%1.2f ",task4Channel1,task4Channel2);
sk398 5:250f51c80ac1 183 }
sk398 6:ceda53939eb8 184
sk398 6:ceda53939eb8 185 /* ==================================== Task 6 ==================================== */
sk398 6:ceda53939eb8 186 int Task6::updateErrorCode(int switch_1, float analog1, float analog2)
sk398 6:ceda53939eb8 187 {
sk398 10:c0531edf4850 188 // Using input fields, conduct a logical equation7
sk398 10:c0531edf4850 189 // returning CDTN_MET when true, CDTN_FAIL when false
sk398 10:c0531edf4850 190 if(switch_1 == HIGH && (analog1 > analog2))
sk398 10:c0531edf4850 191 {
sk398 10:c0531edf4850 192 return ERROR_CODE_CDTN_MET;
sk398 10:c0531edf4850 193 }
sk398 6:ceda53939eb8 194 else
sk398 10:c0531edf4850 195 {
sk398 10:c0531edf4850 196 return ERROR_CODE_CDTN_FAIL;
sk398 10:c0531edf4850 197 }
sk398 6:ceda53939eb8 198 }
sk398 6:ceda53939eb8 199
sk398 6:ceda53939eb8 200 /* ==================================== Task 5 ==================================== */
sk398 6:ceda53939eb8 201 Task7::Task7( PinName mosi,
sk398 6:ceda53939eb8 202 PinName miso,
sk398 6:ceda53939eb8 203 PinName sck,
sk398 6:ceda53939eb8 204 PinName cs,
sk398 6:ceda53939eb8 205 const char *SDName,
sk398 6:ceda53939eb8 206 const char *dir )
sk398 6:ceda53939eb8 207 {
sk398 10:c0531edf4850 208 // Construct new SDFileSystem object
sk398 6:ceda53939eb8 209 _sd = new SDFileSystem(mosi,miso,sck,cs, SDName);
sk398 10:c0531edf4850 210
sk398 10:c0531edf4850 211 // Call private method to create default directory
sk398 6:ceda53939eb8 212 makeDirectory(dir);
sk398 6:ceda53939eb8 213 }
sk398 6:ceda53939eb8 214
sk398 6:ceda53939eb8 215 void Task7::makeDirectory(const char *dir)
sk398 6:ceda53939eb8 216 {
sk398 10:c0531edf4850 217 // Create directory onto sd card
sk398 6:ceda53939eb8 218 mkdir(dir,0777);
sk398 6:ceda53939eb8 219 }
sk398 6:ceda53939eb8 220
sk398 6:ceda53939eb8 221 int Task7::openFile(const char *dirFile,const char *accessType)
sk398 6:ceda53939eb8 222 {
sk398 10:c0531edf4850 223 // Create pointer to FILE object
sk398 10:c0531edf4850 224 Task7::fp = fopen(dirFile,accessType);
sk398 10:c0531edf4850 225
sk398 10:c0531edf4850 226 // If failed to open file, return 1, indicating error, else return 0
sk398 10:c0531edf4850 227 if(Task7::fp == NULL)
sk398 6:ceda53939eb8 228 {
sk398 6:ceda53939eb8 229 return 1;
sk398 6:ceda53939eb8 230 }
sk398 6:ceda53939eb8 231 return 0;
sk398 6:ceda53939eb8 232 }
sk398 6:ceda53939eb8 233
sk398 6:ceda53939eb8 234 void Task7::writeData(const char *dataStream)
sk398 6:ceda53939eb8 235 {
sk398 10:c0531edf4850 236 // Print Stream of data to FILE object fp
sk398 10:c0531edf4850 237 fprintf(Task7::fp,dataStream);
sk398 6:ceda53939eb8 238 }
sk398 6:ceda53939eb8 239
sk398 6:ceda53939eb8 240 void Task7::closeFile()
sk398 6:ceda53939eb8 241 {
sk398 10:c0531edf4850 242 // Close file located at fp
sk398 10:c0531edf4850 243 fclose(Task7::fp);
sk398 6:ceda53939eb8 244 }