File content as of revision 0:bfdc6ed58a06:

/*
 * mbed Application program / Frequency Counter with GPS 1PPS Compensation
 *      Frequency Counter Hardware relataed program
 *
 * Copyright (c) 2014 Kenji Arai / JH1PJL
 *  http://www.page.sannet.ne.jp/kenjia/index.html
 *  http://mbed.org/users/kenjiArai/
 *      Additional functions and modification
 *      started: October   18th, 2014
 *      Revised: Nobember  22nd, 2014
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
 * AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#ifndef        MBED_FRQ_CUNTR
#define        MBED_FRQ_CUNTR

#include "mbed.h"

namespace Frequency_counter
{
    #define DEBUG           // use Communication with PC(UART)
    #define IRQ_DRIVE
    //#define BASE_EXTERNAL_CLOCK
    
    #if defined(BASE_EXTERNAL_CLOCK)
    #define CNT_UPPER       (0xffffffff - 100)
    #define CNT_LOWER       (0          + 100)
    //#define CNT_UPPER       (30000000 + 1000000)
    //#define CNT_LOWER       (30000000 - 1000000)
    #else
    #define CNT_UPPER       (0xffffffff - 100)
    #define CNT_LOWER       (0          + 100)
    //#define CNT_UPPER       (100000000 - 100000)
    //#define CNT_LOWER       (100000000 + 100000)
    #endif
    
    #if defined(BASE_EXTERNAL_CLOCK)
    #define ONE_SECOND_COUNT    0xe4e1c0
    #else
    #define ONE_SECOND_COUNT    0x2faf080
    #endif
    
    #define CNT_BF_SIZE     120
    
    //#if defined(IRQ_DRIVE)
    // 1PPS data
    extern uint32_t onepps_cnt[CNT_BF_SIZE];
    extern uint32_t onepps_num;
    extern uint64_t  onepps_cnt_avarage;
    extern uint8_t  onepps_buf_full;
    extern uint8_t  onepps_ready_flg;
    // TIM2
    extern uint8_t  tim2_ready_flg;
    extern uint32_t tim2_cnt_data;
    extern uint32_t tim2_old_cnt_data;
    // TIM3+4
    extern uint8_t  tim3p4_ready_flg;
    extern uint32_t tim3p4_cnt_data;
    extern uint32_t tim3p4_old_cnt_data;
    
    // TIM2 IC2 Interrupt control
    void irq_ic2_TIM2(void);
    // TIM3 IC2 Interrupt control (same signal connected to TIM4 IC1)
    void irq_ic2_TIM3P4(void);

    class FRQ_CUNTR
    {
    public:
    
        FRQ_CUNTR(PinName f_in);
    
        void initialize_Freq_counter(void);
        
        // Read TIM2 captured counter value
        uint32_t read_ic2_counter_TIM2(void);
        
        // Check TIM2 IC2 status
        uint32_t check_ic2_status_TIM2(void);
    
        // Read TIM3+4(as 32bit) captured counter value
        uint32_t read_ic2_counter_TIM3P4(void);
        
        // Check TIM3 IC2 & TIM4 IC1 status
        uint32_t check_ic2_status_TIM3P4(void);
       
        // Avarage measued data GPS 1PPS by 50MHz Internal Clock
        void avarage_1pps(void);
    
        //  Frequency check for test purpose
        uint32_t read_frequency_TIM2(float gate_time);
        uint32_t read_frequency_TIM3P4(float gate_time);
        
        //  Clock output for test purpose
        void port_mco1_mco2_set(uint8_t select);
    
    protected:
        DigitalIn _pin;
    
        // Initialize TIM2
        // Internal clock (50MHz) and IC2 for GPS 1pps signal measurement
        void initialize_TIM2(void);
        
        // Initialize TIM3 and TIM4 as 32bit counter (TIM3(16bit) + TIM4(16bit))
        //      TIM3 clock input is unkown freq.(measuring freq.) and TIM4 is slave counter
        //      1sec gate signal connected both TIM3 IC2 and TIM4 IC1 
        void initialize_TIM3P4(void);
    
    private:
        #if defined(IRQ_DRIVE)
        // 1PPS data
        uint32_t onepps_cnt[CNT_BF_SIZE];
        uint32_t onepps_num;
        uint64_t  onepps_cnt_avarage;
        uint8_t  onepps_buf_full;
        uint8_t  onepps_ready_flg;
        #endif
    };
}   // Frequency_counter

#endif      // MBED_FRQ_CUNTR