Edwin Kadavy
/
ADCandticker_lab-3_Edwin_Kadavy
ADCandticker_lab-3
Fork of ADCandticker_lab-3_edwin by
main.cpp@2:fe6ada70739c, 2018-02-01 (annotated)
- Committer:
- edwinkad
- Date:
- Thu Feb 01 18:05:47 2018 +0000
- Revision:
- 2:fe6ada70739c
- Parent:
- 1:126dd2f5fc2d
- Child:
- 3:ac78d4a2dd3f
test
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 | |
WilliamMarshQMUL | 0:ad3cdc525b99 | 8 | Ticker tick; // Ticker for reading analog |
WilliamMarshQMUL | 0:ad3cdc525b99 | 9 | AnalogIn ain(A0) ; // Analog input |
edwinkad | 2:fe6ada70739c | 10 | DigitalOut led1(PTA13); // Red LED |
edwinkad | 2:fe6ada70739c | 11 | DigitalOut led2(PTD3); // Red LED |
edwinkad | 2:fe6ada70739c | 12 | DigitalOut led3(PTD2); // Red LED |
edwinkad | 2:fe6ada70739c | 13 | DigitalOut led4(PTD0); // Red LED |
edwinkad | 2:fe6ada70739c | 14 | DigitalOut led5(PTD5); // Red 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 | |
WilliamMarshQMUL | 0:ad3cdc525b99 | 27 | // Function called every 10ms to read ADC |
edwinkad | 2:fe6ada70739c | 28 | // Low pass filter |
WilliamMarshQMUL | 0:ad3cdc525b99 | 29 | // Every 10th value is sent to mailbox |
WilliamMarshQMUL | 0:ad3cdc525b99 | 30 | volatile int samples = 0 ; |
edwinkad | 2:fe6ada70739c | 31 | volatile uint16_t smoothed = 0 ; |
edwinkad | 2:fe6ada70739c | 32 | void readA0() |
edwinkad | 2:fe6ada70739c | 33 | { |
WilliamMarshQMUL | 0:ad3cdc525b99 | 34 | smoothed = (smoothed >> 1) + (ain.read_u16() >> 1) ; |
WilliamMarshQMUL | 0:ad3cdc525b99 | 35 | samples++ ; |
WilliamMarshQMUL | 0:ad3cdc525b99 | 36 | if (samples == 10) { |
WilliamMarshQMUL | 0:ad3cdc525b99 | 37 | // send to thread |
WilliamMarshQMUL | 0:ad3cdc525b99 | 38 | message_t *mess = mailbox.alloc() ; // may fail but does not block |
WilliamMarshQMUL | 0:ad3cdc525b99 | 39 | if (mess) { |
WilliamMarshQMUL | 0:ad3cdc525b99 | 40 | mess->analog = smoothed ; |
WilliamMarshQMUL | 0:ad3cdc525b99 | 41 | mailbox.put(mess); // fails but does not block if full |
WilliamMarshQMUL | 0:ad3cdc525b99 | 42 | } |
WilliamMarshQMUL | 0:ad3cdc525b99 | 43 | samples = 0; |
edwinkad | 2:fe6ada70739c | 44 | } |
WilliamMarshQMUL | 0:ad3cdc525b99 | 45 | } |
WilliamMarshQMUL | 0:ad3cdc525b99 | 46 | |
WilliamMarshQMUL | 0:ad3cdc525b99 | 47 | // Write voltage digits |
WilliamMarshQMUL | 0:ad3cdc525b99 | 48 | // v Voltage as scale int, e.g. 3.30 is 330 |
edwinkad | 2:fe6ada70739c | 49 | void vToString(int v, char* s) |
edwinkad | 2:fe6ada70739c | 50 | { |
WilliamMarshQMUL | 0:ad3cdc525b99 | 51 | s[3] = '0' + (v % 10) ; |
WilliamMarshQMUL | 0:ad3cdc525b99 | 52 | v = v / 10 ; |
WilliamMarshQMUL | 0:ad3cdc525b99 | 53 | s[2] = '0' + (v % 10) ; |
WilliamMarshQMUL | 0:ad3cdc525b99 | 54 | v = v / 10 ; |
WilliamMarshQMUL | 0:ad3cdc525b99 | 55 | s[0] = '0' + (v % 10) ; |
WilliamMarshQMUL | 0:ad3cdc525b99 | 56 | } |
WilliamMarshQMUL | 0:ad3cdc525b99 | 57 | |
WilliamMarshQMUL | 0:ad3cdc525b99 | 58 | // Main program |
WilliamMarshQMUL | 0:ad3cdc525b99 | 59 | // Initialise variables |
WilliamMarshQMUL | 0:ad3cdc525b99 | 60 | // Attach ISR for ticker |
edwinkad | 2:fe6ada70739c | 61 | // Procss messages from mailbox |
edwinkad | 2:fe6ada70739c | 62 | int main() |
edwinkad | 2:fe6ada70739c | 63 | { |
edwinkad | 2:fe6ada70739c | 64 | led1 = 1 ; // turn off |
WilliamMarshQMUL | 0:ad3cdc525b99 | 65 | int volts = 0 ; |
WilliamMarshQMUL | 0:ad3cdc525b99 | 66 | const int threshold = 100 ; |
WilliamMarshQMUL | 0:ad3cdc525b99 | 67 | int counter = 0 ; |
WilliamMarshQMUL | 0:ad3cdc525b99 | 68 | char vstring[] = "X.XX\r\n" ; |
WilliamMarshQMUL | 0:ad3cdc525b99 | 69 | |
WilliamMarshQMUL | 0:ad3cdc525b99 | 70 | tick.attach_us(callback(&readA0), 10000); // ticks every 10ms |
WilliamMarshQMUL | 0:ad3cdc525b99 | 71 | while (true) { |
edwinkad | 2:fe6ada70739c | 72 | osEvent evt = mailbox.get(); // wait for mail |
WilliamMarshQMUL | 0:ad3cdc525b99 | 73 | if (evt.status == osEventMail) { |
WilliamMarshQMUL | 0:ad3cdc525b99 | 74 | message_t* mess = (message_t*)evt.value.p ; |
WilliamMarshQMUL | 0:ad3cdc525b99 | 75 | volts = (mess->analog * 330) / 0xffff ; |
WilliamMarshQMUL | 0:ad3cdc525b99 | 76 | mailbox.free(mess) ; // free the message space |
edwinkad | 2:fe6ada70739c | 77 | if (volts > 55 && volts < 109) { |
edwinkad | 2:fe6ada70739c | 78 | led1 = 1 ; |
edwinkad | 2:fe6ada70739c | 79 | led2 = 0 ; |
edwinkad | 2:fe6ada70739c | 80 | led3 = 0 ; |
edwinkad | 2:fe6ada70739c | 81 | led4 = 0 ; |
edwinkad | 2:fe6ada70739c | 82 | led5 = 0 ; |
edwinkad | 2:fe6ada70739c | 83 | } else if (volts > 110 && volts < 164) { |
edwinkad | 2:fe6ada70739c | 84 | led1 = 1 ; |
edwinkad | 2:fe6ada70739c | 85 | led2 = 1 ; |
edwinkad | 2:fe6ada70739c | 86 | led3 = 0 ; |
edwinkad | 2:fe6ada70739c | 87 | led4 = 0 ; |
edwinkad | 2:fe6ada70739c | 88 | led5 = 0 ; |
edwinkad | 2:fe6ada70739c | 89 | } else if (volts > 165 && volts < 219) { |
edwinkad | 2:fe6ada70739c | 90 | led1 = 1 ; |
edwinkad | 2:fe6ada70739c | 91 | led2 = 1 ; |
edwinkad | 2:fe6ada70739c | 92 | led3 = 1 ; |
edwinkad | 2:fe6ada70739c | 93 | led4 = 0 ; |
edwinkad | 2:fe6ada70739c | 94 | led5 = 0 ; |
edwinkad | 2:fe6ada70739c | 95 | } else if (volts > 220 && volts < 274) { |
edwinkad | 2:fe6ada70739c | 96 | led1 = 1 ; |
edwinkad | 2:fe6ada70739c | 97 | led2 = 1 ; |
edwinkad | 2:fe6ada70739c | 98 | led3 = 1 ; |
edwinkad | 2:fe6ada70739c | 99 | led4 = 1 ; |
edwinkad | 2:fe6ada70739c | 100 | led5 = 0 ; |
edwinkad | 2:fe6ada70739c | 101 | } else if (volts > 275) { |
edwinkad | 2:fe6ada70739c | 102 | led1 = 1 ; |
edwinkad | 2:fe6ada70739c | 103 | led2 = 1 ; |
edwinkad | 2:fe6ada70739c | 104 | led3 = 1 ; |
edwinkad | 2:fe6ada70739c | 105 | led4 = 1 ; |
edwinkad | 2:fe6ada70739c | 106 | led5 = 1 ; |
edwinkad | 2:fe6ada70739c | 107 | } else { |
edwinkad | 2:fe6ada70739c | 108 | led1 = 0 ; |
edwinkad | 2:fe6ada70739c | 109 | led2 = 0 ; |
edwinkad | 2:fe6ada70739c | 110 | led3 = 0 ; |
edwinkad | 2:fe6ada70739c | 111 | led4 = 0 ; |
edwinkad | 2:fe6ada70739c | 112 | led5 = 0 ; |
edwinkad | 2:fe6ada70739c | 113 | } |
WilliamMarshQMUL | 0:ad3cdc525b99 | 114 | vToString(volts, vstring) ; |
WilliamMarshQMUL | 0:ad3cdc525b99 | 115 | counter++ ; |
WilliamMarshQMUL | 0:ad3cdc525b99 | 116 | if (counter == 10) { // limit bandwidth of serial |
WilliamMarshQMUL | 0:ad3cdc525b99 | 117 | pc.printf(vstring) ; |
WilliamMarshQMUL | 0:ad3cdc525b99 | 118 | counter = 0 ; |
WilliamMarshQMUL | 0:ad3cdc525b99 | 119 | } |
WilliamMarshQMUL | 0:ad3cdc525b99 | 120 | } |
WilliamMarshQMUL | 0:ad3cdc525b99 | 121 | |
WilliamMarshQMUL | 0:ad3cdc525b99 | 122 | } |
WilliamMarshQMUL | 0:ad3cdc525b99 | 123 | } |