Frequency Counter Library. Only for mbed LPC1768, mbed LPC1114FN28, Nucleo-F401 and Nucleo-F411. No way to change pin assign.
Dependents: Frequency_Counter Frequency_wind_speed_measure Frequency_counter_wind_speed
Please refer following page.
http://developer.mbed.org/users/kenjiArai/notebook/simple-frequency-counter/
freq_counter.h@4:9a726b997366, 2020-08-04 (annotated)
- Committer:
- kenjiArai
- Date:
- Tue Aug 04 03:59:07 2020 +0000
- Revision:
- 4:9a726b997366
- Parent:
- 3:61bea8bfe404
modified for running on mbed-os-6.2.0
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
kenjiArai | 0:83661d0d09c0 | 1 | /* |
kenjiArai | 0:83661d0d09c0 | 2 | * mbed Library program |
kenjiArai | 0:83661d0d09c0 | 3 | * Frequency Counter Hardware relataed program |
kenjiArai | 0:83661d0d09c0 | 4 | * |
kenjiArai | 4:9a726b997366 | 5 | * Copyright (c) 2014,'20 Kenji Arai / JH1PJL |
kenjiArai | 4:9a726b997366 | 6 | * http://www7b.biglobe.ne.jp/~kenjia/ |
kenjiArai | 4:9a726b997366 | 7 | * https://os.mbed.com/users/kenjiArai/ |
kenjiArai | 4:9a726b997366 | 8 | * Additional functions and modification |
kenjiArai | 4:9a726b997366 | 9 | * started: October 18th, 2014 |
kenjiArai | 4:9a726b997366 | 10 | * Revised: August 4th, 2020 |
kenjiArai | 0:83661d0d09c0 | 11 | */ |
kenjiArai | 0:83661d0d09c0 | 12 | |
kenjiArai | 0:83661d0d09c0 | 13 | #ifndef MBED_F_COUNTER |
kenjiArai | 0:83661d0d09c0 | 14 | #define MBED_F_COUNTER |
kenjiArai | 0:83661d0d09c0 | 15 | |
kenjiArai | 0:83661d0d09c0 | 16 | #include "mbed.h" |
kenjiArai | 0:83661d0d09c0 | 17 | |
kenjiArai | 0:83661d0d09c0 | 18 | /** Frequency Counter |
kenjiArai | 0:83661d0d09c0 | 19 | * |
kenjiArai | 3:61bea8bfe404 | 20 | * CAUTION: Direct access to the CPU Timer module!! |
kenjiArai | 3:61bea8bfe404 | 21 | * No way to change pin assign and timer module, |
kenjiArai | 3:61bea8bfe404 | 22 | * mbed LPC1768 -> p30, |
kenjiArai | 3:61bea8bfe404 | 23 | * mbed LPC1114FN28 -> dp14, |
kenjiArai | 4:9a726b997366 | 24 | * Nucleo F401RE,F411RE & F446RE -> PA_0/A0 |
kenjiArai | 0:83661d0d09c0 | 25 | * |
kenjiArai | 0:83661d0d09c0 | 26 | * @code |
kenjiArai | 0:83661d0d09c0 | 27 | * #include "mbed.h" |
kenjiArai | 0:83661d0d09c0 | 28 | * #include "freq_counter.h" |
kenjiArai | 0:83661d0d09c0 | 29 | * |
kenjiArai | 4:9a726b997366 | 30 | * //F_COUNTER fc(p30); // for LPC1768 |
kenjiArai | 3:61bea8bfe404 | 31 | * //F_COUNTER fc(dp14); // for LPC1114 |
kenjiArai | 4:9a726b997366 | 32 | * F_COUNTER fc(PA_0); // for F401,F411,F446 |
kenjiArai | 0:83661d0d09c0 | 33 | * |
kenjiArai | 0:83661d0d09c0 | 34 | * int main() { |
kenjiArai | 0:83661d0d09c0 | 35 | * uint32_t frequency = 0; |
kenjiArai | 0:83661d0d09c0 | 36 | * |
kenjiArai | 0:83661d0d09c0 | 37 | * while(true) { |
kenjiArai | 4:9a726b997366 | 38 | * freqency = fc.read_frequency(1000000); // gate time: 1 sec |
kenjiArai | 0:83661d0d09c0 | 39 | * printf("%d [Hz]", frequency); |
kenjiArai | 0:83661d0d09c0 | 40 | * } |
kenjiArai | 0:83661d0d09c0 | 41 | * } |
kenjiArai | 0:83661d0d09c0 | 42 | * @endcode |
kenjiArai | 0:83661d0d09c0 | 43 | */ |
kenjiArai | 0:83661d0d09c0 | 44 | |
kenjiArai | 0:83661d0d09c0 | 45 | class F_COUNTER |
kenjiArai | 0:83661d0d09c0 | 46 | { |
kenjiArai | 0:83661d0d09c0 | 47 | public: |
kenjiArai | 0:83661d0d09c0 | 48 | /** Configure data pin |
kenjiArai | 0:83661d0d09c0 | 49 | * @param frequency counter input pin |
kenjiArai | 0:83661d0d09c0 | 50 | */ |
kenjiArai | 0:83661d0d09c0 | 51 | F_COUNTER(PinName f_in); |
kenjiArai | 0:83661d0d09c0 | 52 | |
kenjiArai | 0:83661d0d09c0 | 53 | /** Read measured frequency |
kenjiArai | 4:9a726b997366 | 54 | * @param gate time (uSec) gate = 1sec -> set 1000000 |
kenjiArai | 0:83661d0d09c0 | 55 | * @return measured frequency |
kenjiArai | 0:83661d0d09c0 | 56 | */ |
kenjiArai | 4:9a726b997366 | 57 | uint32_t read_frequency(uint32_t gate_time); |
kenjiArai | 0:83661d0d09c0 | 58 | |
kenjiArai | 0:83661d0d09c0 | 59 | protected: |
kenjiArai | 0:83661d0d09c0 | 60 | DigitalIn _pin; |
kenjiArai | 4:9a726b997366 | 61 | Timer _t; |
kenjiArai | 0:83661d0d09c0 | 62 | |
kenjiArai | 0:83661d0d09c0 | 63 | void initialize(void); |
kenjiArai | 4:9a726b997366 | 64 | uint32_t rd_frq(uint32_t gate_time); |
kenjiArai | 0:83661d0d09c0 | 65 | |
kenjiArai | 0:83661d0d09c0 | 66 | private: |
kenjiArai | 0:83661d0d09c0 | 67 | uint32_t freq; |
kenjiArai | 0:83661d0d09c0 | 68 | |
kenjiArai | 0:83661d0d09c0 | 69 | }; |
kenjiArai | 0:83661d0d09c0 | 70 | |
kenjiArai | 0:83661d0d09c0 | 71 | #endif // MBED_F_COUNTER |