Kenji Arai / freq_counter_STM32F4xx

Simple frequency counter, run without modification on Nucleo board, Input pin PA0, PA1, PB3. Only for STM32F4 series (Tested on Nucleo-F401RE,-F411RE and F446RE)

Dependents:   Frequency_Counter_for_STM32F4xx

see /users/kenjiArai/notebook/frequency-counters/

freq_counter.h@0:83661d0d09c0, 2014-10-19 (annotated)

Committer:
kenjiArai
Date:
Sun Oct 19 06:44:51 2014 +0000
Revision:
0:83661d0d09c0
Child:
1:fd2e1c853ab6
Frequency Counter Lib. based on mio/5MHzOSC program

Who changed what in which revision?

UserRevisionLine numberNew 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 0:83661d0d09c0 5 * Copyright (c) 2014 Kenji Arai / JH1PJL
kenjiArai 0:83661d0d09c0 6 * http://www.page.sannet.ne.jp/kenjia/index.html
kenjiArai 0:83661d0d09c0 7 * http://mbed.org/users/kenjiArai/
kenjiArai 0:83661d0d09c0 8 * Created: October 18th, 2014
kenjiArai 0:83661d0d09c0 9 * Revised: October 19th, 2014
kenjiArai 0:83661d0d09c0 10 *
kenjiArai 0:83661d0d09c0 11 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
kenjiArai 0:83661d0d09c0 12 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
kenjiArai 0:83661d0d09c0 13 * AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
kenjiArai 0:83661d0d09c0 14 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
kenjiArai 0:83661d0d09c0 15 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
kenjiArai 0:83661d0d09c0 16 */
kenjiArai 0:83661d0d09c0 17
kenjiArai 0:83661d0d09c0 18 #ifndef MBED_F_COUNTER
kenjiArai 0:83661d0d09c0 19 #define MBED_F_COUNTER
kenjiArai 0:83661d0d09c0 20
kenjiArai 0:83661d0d09c0 21 #include "mbed.h"
kenjiArai 0:83661d0d09c0 22
kenjiArai 0:83661d0d09c0 23 /** Frequency Counter
kenjiArai 0:83661d0d09c0 24 *
kenjiArai 0:83661d0d09c0 25 * CAUTION: Direct access to the CPU Timer module!!
kenjiArai 0:83661d0d09c0 26 * No way to change pin asｓign and timer module
kenjiArai 0:83661d0d09c0 27 *
kenjiArai 0:83661d0d09c0 28 * @code
kenjiArai 0:83661d0d09c0 29 * #include "mbed.h"
kenjiArai 0:83661d0d09c0 30 * #include "freq_counter.h"
kenjiArai 0:83661d0d09c0 31 *
kenjiArai 0:83661d0d09c0 32 * F_COUNTER fc(p30);
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 0:83661d0d09c0 38 * freqency = fc.read_frequency(1.0); // 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 0:83661d0d09c0 54 * @param gate time
kenjiArai 0:83661d0d09c0 55 * @return measured frequency
kenjiArai 0:83661d0d09c0 56 */
kenjiArai 0:83661d0d09c0 57 uint32_t read_frequency(float gate_time);
kenjiArai 0:83661d0d09c0 58
kenjiArai 0:83661d0d09c0 59 protected:
kenjiArai 0:83661d0d09c0 60 DigitalIn _pin;
kenjiArai 0:83661d0d09c0 61
kenjiArai 0:83661d0d09c0 62 void initialize(void);
kenjiArai 0:83661d0d09c0 63
kenjiArai 0:83661d0d09c0 64 private:
kenjiArai 0:83661d0d09c0 65 uint32_t freq;
kenjiArai 0:83661d0d09c0 66
kenjiArai 0:83661d0d09c0 67 };
kenjiArai 0:83661d0d09c0 68
kenjiArai 0:83661d0d09c0 69 #endif // MBED_F_COUNTER