Lluis Nadal
Simple test for TCS230, color light-to-frequency converter.
main.cpp@0:211fa784ae3e, 2011-08-28 (annotated)
- Committer:
- lnadal
- Date:
- Sun Aug 28 07:53:11 2011 +0000
- Revision:
- 0:211fa784ae3e
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| lnadal | 0:211fa784ae3e | 1 | /* |
| lnadal | 0:211fa784ae3e | 2 | **************************************************** |
| lnadal | 0:211fa784ae3e | 3 | TCS230 test. COLOR LIGHT TO FREQUENCY CONVERTER. |
| lnadal | 0:211fa784ae3e | 4 | Frequency is measured by interrupts. |
| lnadal | 0:211fa784ae3e | 5 | |
| lnadal | 0:211fa784ae3e | 6 | Wiring: TCS230 mBed |
| lnadal | 0:211fa784ae3e | 7 | p1(s0) p5 |
| lnadal | 0:211fa784ae3e | 8 | p2(s1) p6 |
| lnadal | 0:211fa784ae3e | 9 | p7(s2) p7 |
| lnadal | 0:211fa784ae3e | 10 | p8(s3) p8 |
| lnadal | 0:211fa784ae3e | 11 | p6(out) p9 |
| lnadal | 0:211fa784ae3e | 12 | p3(OE), p4(GND) tied to ground. p5(Vcc) tied to 3V3. |
| lnadal | 0:211fa784ae3e | 13 | |
| lnadal | 0:211fa784ae3e | 14 | Author: Lluis Nadal. August 2011. |
| lnadal | 0:211fa784ae3e | 15 | **************************************************** |
| lnadal | 0:211fa784ae3e | 16 | */ |
| lnadal | 0:211fa784ae3e | 17 | |
| lnadal | 0:211fa784ae3e | 18 | |
| lnadal | 0:211fa784ae3e | 19 | #include "mbed.h" |
| lnadal | 0:211fa784ae3e | 20 | |
| lnadal | 0:211fa784ae3e | 21 | |
| lnadal | 0:211fa784ae3e | 22 | Serial pc(USBTX, USBRX); |
| lnadal | 0:211fa784ae3e | 23 | InterruptIn in(p9); |
| lnadal | 0:211fa784ae3e | 24 | DigitalOut s0(p5), s1(p6); // s2(p7), s3(p8) |
| lnadal | 0:211fa784ae3e | 25 | BusOut setColor(p8, p7); //(LSB pin,..., MSB pin): (s3, s2). Red: 0, Blue: 1, Clear: 2, Green: 3. |
| lnadal | 0:211fa784ae3e | 26 | Timer t; |
| lnadal | 0:211fa784ae3e | 27 | |
| lnadal | 0:211fa784ae3e | 28 | float period = 0; // This is the period between interrupts in microseconds |
| lnadal | 0:211fa784ae3e | 29 | float freq = 0; |
| lnadal | 0:211fa784ae3e | 30 | int n; |
| lnadal | 0:211fa784ae3e | 31 | int color; // Color |
| lnadal | 0:211fa784ae3e | 32 | |
| lnadal | 0:211fa784ae3e | 33 | |
| lnadal | 0:211fa784ae3e | 34 | void print() { // Print to PC |
| lnadal | 0:211fa784ae3e | 35 | switch (color) { |
| lnadal | 0:211fa784ae3e | 36 | case 0: |
| lnadal | 0:211fa784ae3e | 37 | pc.printf(" Red: \t\t%.2f Hz, \t%.2f us\r\n", freq, period); |
| lnadal | 0:211fa784ae3e | 38 | break; |
| lnadal | 0:211fa784ae3e | 39 | case 1: |
| lnadal | 0:211fa784ae3e | 40 | pc.printf(" Blue: \t\t%.2f Hz, \t%.2f us\r\n", freq, period); |
| lnadal | 0:211fa784ae3e | 41 | break; |
| lnadal | 0:211fa784ae3e | 42 | case 2: |
| lnadal | 0:211fa784ae3e | 43 | pc.printf(" Clear: \t%.2f Hz, \t%.2f us\r\n", freq, period); |
| lnadal | 0:211fa784ae3e | 44 | break; |
| lnadal | 0:211fa784ae3e | 45 | case 3: |
| lnadal | 0:211fa784ae3e | 46 | pc.printf(" Green: \t%.2f Hz, \t%.2f us\r\n", freq, period); |
| lnadal | 0:211fa784ae3e | 47 | pc.printf("\r\n"); |
| lnadal | 0:211fa784ae3e | 48 | break; |
| lnadal | 0:211fa784ae3e | 49 | } |
| lnadal | 0:211fa784ae3e | 50 | } |
| lnadal | 0:211fa784ae3e | 51 | |
| lnadal | 0:211fa784ae3e | 52 | |
| lnadal | 0:211fa784ae3e | 53 | void time() { |
| lnadal | 0:211fa784ae3e | 54 | if (n>99) { // Wait 100 interrupts |
| lnadal | 0:211fa784ae3e | 55 | period = t.read_us()/(float)n; // Get time |
| lnadal | 0:211fa784ae3e | 56 | freq = (1/period)*1000000; // Convert period (in us) to frequency (Hz). Works up to 100kHz. |
| lnadal | 0:211fa784ae3e | 57 | n = 0; |
| lnadal | 0:211fa784ae3e | 58 | |
| lnadal | 0:211fa784ae3e | 59 | print(); // Print values to PC |
| lnadal | 0:211fa784ae3e | 60 | |
| lnadal | 0:211fa784ae3e | 61 | color++; |
| lnadal | 0:211fa784ae3e | 62 | if (color > 3) color = 0; |
| lnadal | 0:211fa784ae3e | 63 | setColor = color; |
| lnadal | 0:211fa784ae3e | 64 | wait(0.5); |
| lnadal | 0:211fa784ae3e | 65 | t.reset(); // Reset timer and wait for next interrupt |
| lnadal | 0:211fa784ae3e | 66 | } |
| lnadal | 0:211fa784ae3e | 67 | n++; |
| lnadal | 0:211fa784ae3e | 68 | } |
| lnadal | 0:211fa784ae3e | 69 | |
| lnadal | 0:211fa784ae3e | 70 | |
| lnadal | 0:211fa784ae3e | 71 | int main() { |
| lnadal | 0:211fa784ae3e | 72 | |
| lnadal | 0:211fa784ae3e | 73 | in.mode(PullDown); // Set the pin to Pull Down mode. |
| lnadal | 0:211fa784ae3e | 74 | wait(1); |
| lnadal | 0:211fa784ae3e | 75 | n = 0; |
| lnadal | 0:211fa784ae3e | 76 | color = 0; |
| lnadal | 0:211fa784ae3e | 77 | setColor = color; |
| lnadal | 0:211fa784ae3e | 78 | |
| lnadal | 0:211fa784ae3e | 79 | s0 = 0; |
| lnadal | 0:211fa784ae3e | 80 | s1 = 1; // Frequency 2% = 12 kHz full-scale. |
| lnadal | 0:211fa784ae3e | 81 | |
| lnadal | 0:211fa784ae3e | 82 | in.rise(&time); // Set up the interrupt for rising edge |
| lnadal | 0:211fa784ae3e | 83 | t.start(); // Start the timer |
| lnadal | 0:211fa784ae3e | 84 | |
| lnadal | 0:211fa784ae3e | 85 | while (1) { |
| lnadal | 0:211fa784ae3e | 86 | |
| lnadal | 0:211fa784ae3e | 87 | } |
| lnadal | 0:211fa784ae3e | 88 | } |
| lnadal | 0:211fa784ae3e | 89 | |
| lnadal | 0:211fa784ae3e | 90 | |
| lnadal | 0:211fa784ae3e | 91 |