Edwin Kadavy
/
ADCandticker_lab-3_Edwin_Kadavy
ADCandticker_lab-3
Fork of ADCandticker_lab-3_edwin by
main.cpp@3:ac78d4a2dd3f, 2018-02-11 (annotated)
- Committer:
- edwinkad
- Date:
- Sun Feb 11 21:00:45 2018 +0000
- Revision:
- 3:ac78d4a2dd3f
- Parent:
- 2:fe6ada70739c
Edwin;
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
WilliamMarshQMUL | 0:ad3cdc525b99 | 1 | |
WilliamMarshQMUL | 0:ad3cdc525b99 | 2 | // LAB 3 SAMPLE PROGRAM 1 |
WilliamMarshQMUL | 1:126dd2f5fc2d | 3 | // Revised for mbed 5 |
WilliamMarshQMUL | 0:ad3cdc525b99 | 4 | |
WilliamMarshQMUL | 0:ad3cdc525b99 | 5 | #include "mbed.h" |
WilliamMarshQMUL | 1:126dd2f5fc2d | 6 | |
WilliamMarshQMUL | 0:ad3cdc525b99 | 7 | Ticker tick; // Ticker for reading analog |
WilliamMarshQMUL | 0:ad3cdc525b99 | 8 | AnalogIn ain(A0) ; // Analog input |
edwinkad | 3:ac78d4a2dd3f | 9 | DigitalIn b1(PTC9, PullUp); |
edwinkad | 3:ac78d4a2dd3f | 10 | DigitalOut led1(PTA13); // Red LED |
edwinkad | 3:ac78d4a2dd3f | 11 | DigitalOut led2(PTD5); // Yellow LED |
edwinkad | 3:ac78d4a2dd3f | 12 | DigitalOut led3(PTD0); // Green LED |
edwinkad | 3:ac78d4a2dd3f | 13 | DigitalOut led4(PTD2); // Green LED |
edwinkad | 3:ac78d4a2dd3f | 14 | DigitalOut led5(PTD3); // Green LED |
edwinkad | 2:fe6ada70739c | 15 | |
WilliamMarshQMUL | 0:ad3cdc525b99 | 16 | |
WilliamMarshQMUL | 0:ad3cdc525b99 | 17 | Serial pc(USBTX, USBRX); // tx, rx, for debugging |
WilliamMarshQMUL | 0:ad3cdc525b99 | 18 | |
WilliamMarshQMUL | 0:ad3cdc525b99 | 19 | // Message type |
WilliamMarshQMUL | 0:ad3cdc525b99 | 20 | typedef struct { |
edwinkad | 2:fe6ada70739c | 21 | uint16_t analog; /* Analog input value */ |
WilliamMarshQMUL | 0:ad3cdc525b99 | 22 | } message_t; |
WilliamMarshQMUL | 0:ad3cdc525b99 | 23 | |
WilliamMarshQMUL | 0:ad3cdc525b99 | 24 | // Mail box |
WilliamMarshQMUL | 0:ad3cdc525b99 | 25 | Mail<message_t, 2> mailbox; |
WilliamMarshQMUL | 0:ad3cdc525b99 | 26 | |
edwinkad | 3:ac78d4a2dd3f | 27 | |
WilliamMarshQMUL | 0:ad3cdc525b99 | 28 | // Function called every 10ms to read ADC |
edwinkad | 2:fe6ada70739c | 29 | // Low pass filter |
WilliamMarshQMUL | 0:ad3cdc525b99 | 30 | // Every 10th value is sent to mailbox |
WilliamMarshQMUL | 0:ad3cdc525b99 | 31 | volatile int samples = 0 ; |
edwinkad | 2:fe6ada70739c | 32 | volatile uint16_t smoothed = 0 ; |
edwinkad | 2:fe6ada70739c | 33 | void readA0() |
edwinkad | 2:fe6ada70739c | 34 | { |
WilliamMarshQMUL | 0:ad3cdc525b99 | 35 | smoothed = (smoothed >> 1) + (ain.read_u16() >> 1) ; |
WilliamMarshQMUL | 0:ad3cdc525b99 | 36 | samples++ ; |
WilliamMarshQMUL | 0:ad3cdc525b99 | 37 | if (samples == 10) { |
WilliamMarshQMUL | 0:ad3cdc525b99 | 38 | // send to thread |
WilliamMarshQMUL | 0:ad3cdc525b99 | 39 | message_t *mess = mailbox.alloc() ; // may fail but does not block |
WilliamMarshQMUL | 0:ad3cdc525b99 | 40 | if (mess) { |
WilliamMarshQMUL | 0:ad3cdc525b99 | 41 | mess->analog = smoothed ; |
WilliamMarshQMUL | 0:ad3cdc525b99 | 42 | mailbox.put(mess); // fails but does not block if full |
WilliamMarshQMUL | 0:ad3cdc525b99 | 43 | } |
WilliamMarshQMUL | 0:ad3cdc525b99 | 44 | samples = 0; |
edwinkad | 2:fe6ada70739c | 45 | } |
WilliamMarshQMUL | 0:ad3cdc525b99 | 46 | } |
WilliamMarshQMUL | 0:ad3cdc525b99 | 47 | |
WilliamMarshQMUL | 0:ad3cdc525b99 | 48 | // Write voltage digits |
WilliamMarshQMUL | 0:ad3cdc525b99 | 49 | // v Voltage as scale int, e.g. 3.30 is 330 |
edwinkad | 2:fe6ada70739c | 50 | void vToString(int v, char* s) |
edwinkad | 2:fe6ada70739c | 51 | { |
WilliamMarshQMUL | 0:ad3cdc525b99 | 52 | s[3] = '0' + (v % 10) ; |
WilliamMarshQMUL | 0:ad3cdc525b99 | 53 | v = v / 10 ; |
WilliamMarshQMUL | 0:ad3cdc525b99 | 54 | s[2] = '0' + (v % 10) ; |
WilliamMarshQMUL | 0:ad3cdc525b99 | 55 | v = v / 10 ; |
WilliamMarshQMUL | 0:ad3cdc525b99 | 56 | s[0] = '0' + (v % 10) ; |
WilliamMarshQMUL | 0:ad3cdc525b99 | 57 | } |
edwinkad | 3:ac78d4a2dd3f | 58 | Thread pollV; // thread to set new max voltage |
edwinkad | 3:ac78d4a2dd3f | 59 | volatile int pressEvent = 0 ; // Variabe set by the polling thread |
edwinkad | 3:ac78d4a2dd3f | 60 | enum buttonPos { up, down, bounce }; // Button positions |
edwinkad | 3:ac78d4a2dd3f | 61 | |
edwinkad | 3:ac78d4a2dd3f | 62 | void switchPoll(){ |
edwinkad | 3:ac78d4a2dd3f | 63 | buttonPos pos = up ; |
edwinkad | 3:ac78d4a2dd3f | 64 | int bcounter = 0 ; |
edwinkad | 3:ac78d4a2dd3f | 65 | while (true) { |
edwinkad | 3:ac78d4a2dd3f | 66 | switch (pos) { |
edwinkad | 3:ac78d4a2dd3f | 67 | case up : |
edwinkad | 3:ac78d4a2dd3f | 68 | if (!b1.read()) { // now down |
edwinkad | 3:ac78d4a2dd3f | 69 | pressEvent = 1 ; // transition occurred |
edwinkad | 3:ac78d4a2dd3f | 70 | pos = down ; |
edwinkad | 3:ac78d4a2dd3f | 71 | } |
edwinkad | 3:ac78d4a2dd3f | 72 | break ; |
edwinkad | 3:ac78d4a2dd3f | 73 | case down : |
edwinkad | 3:ac78d4a2dd3f | 74 | if (b1 == 1) { // no longer down |
edwinkad | 3:ac78d4a2dd3f | 75 | bcounter = 3 ; // wait four cycles |
edwinkad | 3:ac78d4a2dd3f | 76 | pos = bounce ; |
edwinkad | 3:ac78d4a2dd3f | 77 | } |
edwinkad | 3:ac78d4a2dd3f | 78 | break ; |
edwinkad | 3:ac78d4a2dd3f | 79 | case bounce : |
edwinkad | 3:ac78d4a2dd3f | 80 | if (b1 == 0) { // down again - button has bounced |
edwinkad | 3:ac78d4a2dd3f | 81 | pos = down ; // no event |
edwinkad | 3:ac78d4a2dd3f | 82 | } else if (bcounter == 0) { |
edwinkad | 3:ac78d4a2dd3f | 83 | pos = up ; // delay passed - reset to up |
edwinkad | 3:ac78d4a2dd3f | 84 | } else { |
edwinkad | 3:ac78d4a2dd3f | 85 | bcounter-- ; // continue waiting |
edwinkad | 3:ac78d4a2dd3f | 86 | } |
edwinkad | 3:ac78d4a2dd3f | 87 | break ; |
edwinkad | 3:ac78d4a2dd3f | 88 | } |
edwinkad | 3:ac78d4a2dd3f | 89 | Thread::wait(30); |
edwinkad | 3:ac78d4a2dd3f | 90 | } |
edwinkad | 3:ac78d4a2dd3f | 91 | } |
WilliamMarshQMUL | 0:ad3cdc525b99 | 92 | |
WilliamMarshQMUL | 0:ad3cdc525b99 | 93 | // Main program |
WilliamMarshQMUL | 0:ad3cdc525b99 | 94 | // Initialise variables |
WilliamMarshQMUL | 0:ad3cdc525b99 | 95 | // Attach ISR for ticker |
edwinkad | 2:fe6ada70739c | 96 | // Procss messages from mailbox |
edwinkad | 2:fe6ada70739c | 97 | int main() |
edwinkad | 2:fe6ada70739c | 98 | { |
edwinkad | 3:ac78d4a2dd3f | 99 | pollV.start(callback(switchPoll)); |
edwinkad | 3:ac78d4a2dd3f | 100 | //led1 = 1 ; // turn off |
WilliamMarshQMUL | 0:ad3cdc525b99 | 101 | int volts = 0 ; |
edwinkad | 3:ac78d4a2dd3f | 102 | int newVolts=330; |
WilliamMarshQMUL | 0:ad3cdc525b99 | 103 | const int threshold = 100 ; |
WilliamMarshQMUL | 0:ad3cdc525b99 | 104 | int counter = 0 ; |
WilliamMarshQMUL | 0:ad3cdc525b99 | 105 | char vstring[] = "X.XX\r\n" ; |
WilliamMarshQMUL | 0:ad3cdc525b99 | 106 | |
WilliamMarshQMUL | 0:ad3cdc525b99 | 107 | tick.attach_us(callback(&readA0), 10000); // ticks every 10ms |
WilliamMarshQMUL | 0:ad3cdc525b99 | 108 | while (true) { |
edwinkad | 2:fe6ada70739c | 109 | osEvent evt = mailbox.get(); // wait for mail |
WilliamMarshQMUL | 0:ad3cdc525b99 | 110 | if (evt.status == osEventMail) { |
WilliamMarshQMUL | 0:ad3cdc525b99 | 111 | message_t* mess = (message_t*)evt.value.p ; |
WilliamMarshQMUL | 0:ad3cdc525b99 | 112 | volts = (mess->analog * 330) / 0xffff ; |
edwinkad | 3:ac78d4a2dd3f | 113 | if (pressEvent) { |
edwinkad | 3:ac78d4a2dd3f | 114 | pressEvent = 0 ; // clear the event variable |
edwinkad | 3:ac78d4a2dd3f | 115 | newVolts=volts; |
edwinkad | 3:ac78d4a2dd3f | 116 | } |
WilliamMarshQMUL | 0:ad3cdc525b99 | 117 | mailbox.free(mess) ; // free the message space |
edwinkad | 3:ac78d4a2dd3f | 118 | if (volts >= ((newVolts/6)*1) && volts < ((newVolts/6)*2)) { |
edwinkad | 2:fe6ada70739c | 119 | led1 = 1 ; |
edwinkad | 2:fe6ada70739c | 120 | led2 = 0 ; |
edwinkad | 2:fe6ada70739c | 121 | led3 = 0 ; |
edwinkad | 2:fe6ada70739c | 122 | led4 = 0 ; |
edwinkad | 2:fe6ada70739c | 123 | led5 = 0 ; |
edwinkad | 3:ac78d4a2dd3f | 124 | } else if (volts >= ((newVolts/6)*2) && volts < ((newVolts/6)*3)) { |
edwinkad | 2:fe6ada70739c | 125 | led1 = 1 ; |
edwinkad | 2:fe6ada70739c | 126 | led2 = 1 ; |
edwinkad | 2:fe6ada70739c | 127 | led3 = 0 ; |
edwinkad | 2:fe6ada70739c | 128 | led4 = 0 ; |
edwinkad | 2:fe6ada70739c | 129 | led5 = 0 ; |
edwinkad | 3:ac78d4a2dd3f | 130 | } else if (volts >= ((newVolts/6)*3) && volts < ((newVolts/6)*4)) { |
edwinkad | 2:fe6ada70739c | 131 | led1 = 1 ; |
edwinkad | 2:fe6ada70739c | 132 | led2 = 1 ; |
edwinkad | 2:fe6ada70739c | 133 | led3 = 1 ; |
edwinkad | 2:fe6ada70739c | 134 | led4 = 0 ; |
edwinkad | 2:fe6ada70739c | 135 | led5 = 0 ; |
edwinkad | 3:ac78d4a2dd3f | 136 | } else if (volts >= ((newVolts/6)*4) && volts < ((newVolts/6)*5)) { |
edwinkad | 2:fe6ada70739c | 137 | led1 = 1 ; |
edwinkad | 2:fe6ada70739c | 138 | led2 = 1 ; |
edwinkad | 2:fe6ada70739c | 139 | led3 = 1 ; |
edwinkad | 2:fe6ada70739c | 140 | led4 = 1 ; |
edwinkad | 2:fe6ada70739c | 141 | led5 = 0 ; |
edwinkad | 3:ac78d4a2dd3f | 142 | } else if (volts >= ((newVolts/6)*5)) { |
edwinkad | 2:fe6ada70739c | 143 | led1 = 1 ; |
edwinkad | 2:fe6ada70739c | 144 | led2 = 1 ; |
edwinkad | 2:fe6ada70739c | 145 | led3 = 1 ; |
edwinkad | 2:fe6ada70739c | 146 | led4 = 1 ; |
edwinkad | 2:fe6ada70739c | 147 | led5 = 1 ; |
edwinkad | 2:fe6ada70739c | 148 | } else { |
edwinkad | 2:fe6ada70739c | 149 | led1 = 0 ; |
edwinkad | 2:fe6ada70739c | 150 | led2 = 0 ; |
edwinkad | 2:fe6ada70739c | 151 | led3 = 0 ; |
edwinkad | 2:fe6ada70739c | 152 | led4 = 0 ; |
edwinkad | 2:fe6ada70739c | 153 | led5 = 0 ; |
edwinkad | 2:fe6ada70739c | 154 | } |
WilliamMarshQMUL | 0:ad3cdc525b99 | 155 | vToString(volts, vstring) ; |
WilliamMarshQMUL | 0:ad3cdc525b99 | 156 | counter++ ; |
WilliamMarshQMUL | 0:ad3cdc525b99 | 157 | if (counter == 10) { // limit bandwidth of serial |
WilliamMarshQMUL | 0:ad3cdc525b99 | 158 | pc.printf(vstring) ; |
WilliamMarshQMUL | 0:ad3cdc525b99 | 159 | counter = 0 ; |
WilliamMarshQMUL | 0:ad3cdc525b99 | 160 | } |
WilliamMarshQMUL | 0:ad3cdc525b99 | 161 | } |
WilliamMarshQMUL | 0:ad3cdc525b99 | 162 | |
WilliamMarshQMUL | 0:ad3cdc525b99 | 163 | } |
WilliamMarshQMUL | 0:ad3cdc525b99 | 164 | } |