Thomas Hamilton
Interface class for the Max Botix ultrasonic range finder model 1210. It includes input methods for PWM, Analog, and Serial. A PwmIn class was created to allow the PWM input to be read. Now includes automatic range update via interrupts.
PwmIn/PwmIn.cpp@4:a615b75d4126, 2010-08-28 (annotated)
- Committer:
- Blaze513
- Date:
- Sat Aug 28 07:59:29 2010 +0000
- Revision:
- 4:a615b75d4126
- Parent:
- 3:05183e50a923
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| Blaze513 | 2:997b4057c879 | 1 | //mbed Microcontroller Library |
| Blaze513 | 2:997b4057c879 | 2 | //Pulse Width Modulation Input Interface |
| Blaze513 | 2:997b4057c879 | 3 | //Copyright 2010 |
| Blaze513 | 2:997b4057c879 | 4 | //Thomas Hamilton |
| Blaze513 | 2:997b4057c879 | 5 | |
| Blaze513 | 0:3d969e0b4ca0 | 6 | #include "PwmIn.h" |
| Blaze513 | 0:3d969e0b4ca0 | 7 | |
| Blaze513 | 0:3d969e0b4ca0 | 8 | PwmIn::PwmIn(PinName pwi) : InterruptIn(pwi), PeriodMeasurement(0), PulseWidthMeasurement(1) |
| Blaze513 | 0:3d969e0b4ca0 | 9 | { |
| Blaze513 | 3:05183e50a923 | 10 | mode(PullDown); |
| Blaze513 | 3:05183e50a923 | 11 | rise(this, &PwmIn::PulseStart); |
| Blaze513 | 3:05183e50a923 | 12 | fall(this, &PwmIn::PulseStop); |
| Blaze513 | 3:05183e50a923 | 13 | start(); |
| Blaze513 | 0:3d969e0b4ca0 | 14 | } |
| Blaze513 | 0:3d969e0b4ca0 | 15 | |
| Blaze513 | 0:3d969e0b4ca0 | 16 | float PwmIn::read() |
| Blaze513 | 0:3d969e0b4ca0 | 17 | { |
| Blaze513 | 0:3d969e0b4ca0 | 18 | return (float)PulseWidthMeasurement / PeriodMeasurement; |
| Blaze513 | 0:3d969e0b4ca0 | 19 | } |
| Blaze513 | 0:3d969e0b4ca0 | 20 | |
| Blaze513 | 0:3d969e0b4ca0 | 21 | float PwmIn::period() |
| Blaze513 | 0:3d969e0b4ca0 | 22 | { |
| Blaze513 | 0:3d969e0b4ca0 | 23 | return (float)PeriodMeasurement / 1000000; |
| Blaze513 | 0:3d969e0b4ca0 | 24 | } |
| Blaze513 | 0:3d969e0b4ca0 | 25 | |
| Blaze513 | 0:3d969e0b4ca0 | 26 | int PwmIn::period_ms() |
| Blaze513 | 0:3d969e0b4ca0 | 27 | { |
| Blaze513 | 0:3d969e0b4ca0 | 28 | return PeriodMeasurement / 1000; |
| Blaze513 | 0:3d969e0b4ca0 | 29 | } |
| Blaze513 | 0:3d969e0b4ca0 | 30 | |
| Blaze513 | 0:3d969e0b4ca0 | 31 | int PwmIn::period_us() |
| Blaze513 | 0:3d969e0b4ca0 | 32 | { |
| Blaze513 | 0:3d969e0b4ca0 | 33 | return PeriodMeasurement; |
| Blaze513 | 0:3d969e0b4ca0 | 34 | } |
| Blaze513 | 0:3d969e0b4ca0 | 35 | |
| Blaze513 | 0:3d969e0b4ca0 | 36 | float PwmIn::pulsewidth() |
| Blaze513 | 0:3d969e0b4ca0 | 37 | { |
| Blaze513 | 0:3d969e0b4ca0 | 38 | return (float)PulseWidthMeasurement / 1000000; |
| Blaze513 | 0:3d969e0b4ca0 | 39 | } |
| Blaze513 | 0:3d969e0b4ca0 | 40 | |
| Blaze513 | 0:3d969e0b4ca0 | 41 | int PwmIn::pulsewidth_ms() |
| Blaze513 | 0:3d969e0b4ca0 | 42 | { |
| Blaze513 | 0:3d969e0b4ca0 | 43 | return PulseWidthMeasurement / 1000; |
| Blaze513 | 0:3d969e0b4ca0 | 44 | } |
| Blaze513 | 0:3d969e0b4ca0 | 45 | |
| Blaze513 | 0:3d969e0b4ca0 | 46 | int PwmIn::pulsewidth_us() |
| Blaze513 | 0:3d969e0b4ca0 | 47 | { |
| Blaze513 | 0:3d969e0b4ca0 | 48 | return PulseWidthMeasurement; |
| Blaze513 | 0:3d969e0b4ca0 | 49 | } |
| Blaze513 | 0:3d969e0b4ca0 | 50 | |
| Blaze513 | 0:3d969e0b4ca0 | 51 | void PwmIn::PulseStart() |
| Blaze513 | 0:3d969e0b4ca0 | 52 | { |
| Blaze513 | 0:3d969e0b4ca0 | 53 | PeriodMeasurement = read_us(); |
| Blaze513 | 0:3d969e0b4ca0 | 54 | reset(); |
| Blaze513 | 0:3d969e0b4ca0 | 55 | } |
| Blaze513 | 0:3d969e0b4ca0 | 56 | |
| Blaze513 | 0:3d969e0b4ca0 | 57 | void PwmIn::PulseStop() |
| Blaze513 | 0:3d969e0b4ca0 | 58 | { |
| Blaze513 | 0:3d969e0b4ca0 | 59 | PulseWidthMeasurement = read_us(); |
| Blaze513 | 0:3d969e0b4ca0 | 60 | } |