File content as of revision 4:3ec60ea204c6:

#include "driverLifiRx.h"


//typedef enum LIFI_Tx_Rx_Mode LIFI_Tx_Rx_Mode;
//Lifi_RxTx_Mode vlc_tx_rx_mode = LIFI_Tx_Mode;
//int vlc_tx_rx_mode_bool = 0;
//
//// RX 는 ADC PIN을 3.3V 로 연결한다.
//Lifi_RxTx_Mode is_board_vlc_rx_mode_enum()
//{
//    float meas_r1;
//    float meas_v1;
//
//    meas_r1 = adc_tx_rx_mode_select.read() ;
//    meas_v1 = meas_r1 * 3300;
//    if( ceil(meas_v1) > 1000 ) return LIFI_Tx_Mode;
//    else return Lifi_Rx_Mode;
//}

// Pull up setting. RX - Connect to GND
int Lifi_IsRxMode()
{
#define USE_MODE_SELECT_BY_ADC 0
#if USE_MODE_SELECT_BY_ADC
// 연결이 되지 않으면 기본으로 0 이다.
// 따라서 ADC를 이용할 경우 3.3V와 연결하고나 저항을 이용해서 여러 입력값에 따른 모드를 선택할 수 있다.
    float meas_r1;
    float meas_v1;

    meas_r1 = adc_tx_rx_mode_select.read() ;
    meas_v1 = meas_r1 * 3300;
    printf("meas_r1 = %f, meas_v1 = %f",meas_r1, meas_v1 );
    if( ceil(meas_v1) > 1000 ) return LIFI_Tx_Mode;
    else return Lifi_Rx_Mode;

#else
    int value=1;
    value =  lifi_TxRx_ModePin.read();
    if( value == 0 ) {
        printf("RX mode (%d))", value);
        return 1;
    } else {
        printf("TX mode (%d))", value);
        return 0;
    }
#endif
}


// https://forum.arduino.cc/index.php?topic=185158.0
float LifiRx_GetLuxFromPdVoltage(float volt_mili)
{
#if 0
    float amps_mili = mili_volt / 10000.0;  // across 10,000 Ohms
    float microamps = amps_mili * 1000;
    float lux = microamps * 2.0;
    return lux;
#else
    return  volt_mili / 5.0 ;
#endif
}

// https://code.google.com/archive/p/davidegironi/downloads
/*
 * get lux from voltage
 */
double LifiRx_GetLux_Temt6000(double vol)
{
    //suppose we read the voltage from the emitter of temt6000, with a 10k pulldown resistor connected to gnd
    //V[V] = I[A]*R[ohm] = I[uA] * 1[A]/1000000[킕] * 10000[ohm] = I[uA] * 1[A]/1[uA] * 0.01[ohm]
    //1[uA] = V[V] / 0.01[ohm] = 100 * V[V/ohm]
    //the curve from datasheet seems y=2x+0, so lux = 2 * I[uA] = 2 * 100 * V[V/ohm]
    return 2*(100*vol);
}
float meas_v1_max=0;
float meas_v1_min=3300;
float meas_v2_max=0;
float meas_v2_min=3300;
float meas_v3_max=0;
float meas_v3_min=3300;
float meas_v4_max=0;
float meas_v4_min=3300;
void LifiRx_PdTunning()
{
    float meas_r1;
    float meas_v1;
    float meas_r2;
    float meas_v2;
    float meas_r3;
    float meas_v3;
    float meas_r4;
    float meas_v4;
    meas_v1_max=0;
    meas_v1_min=3300;
    meas_v2_max=0;
    meas_v2_min=3300;
    meas_v3_max=0;
    meas_v3_min=3300;
    meas_v4_max=0;
    meas_v4_min=3300;

// note myvalues for "office light" (ca. 200 lux) and direct sunlight, clear day (ca 50000lux)


// https://www.dfrobot.com/wiki/index.php/DFRobot_Ambient_Light_Sensor_SKU:DFR0026
//Specification
//Supply Voltage: 3.3V to 5V
//Illumination range : 1 Lux to 6000 Lux
//Responsive time : 15us
//Interface: Analog
//Size:22x30mm



    printf("\n4 LifiRx_PdTunning \n");
    buttonInitSkipLoop();
    while(1) {
        if( buttonCanSkipLoop() ) return;
        meas_r1 = adc_1.read(); // Read the analog input value (value from 0.0 to 1.0 = full ADC conversion range)
        meas_v1 = meas_r1 * 3300; // Converts value in the 0V-3.3V range
        meas_r2 = adc_2.read(); // Read the analog input value (value from 0.0 to 1.0 = full ADC conversion range)
        meas_v2 = meas_r2 * 3300; // Converts value in the 0V-3.3V range
        meas_r3 = adc_3.read(); // Read the analog input value (value from 0.0 to 1.0 = full ADC conversion range)
        meas_v3 = meas_r3 * 3300; // Converts value in the 0V-3.3V range
        meas_r4 = adc_4.read(); // Read the analog input value (value from 0.0 to 1.0 = full ADC conversion range)
        meas_v4 = meas_r4 * 3300; // Converts value in the 0V-3.3V range
        if( meas_v1_min > meas_v1 )  meas_v1_min = meas_v1; 
        if( meas_v1_max < meas_v1 )  meas_v1_max = meas_v1;
        if( meas_v2_min > meas_v2 )  meas_v2_min = meas_v2; 
        if( meas_v2_max < meas_v2 )  meas_v2_max = meas_v2;
        if( meas_v3_min > meas_v3 )  meas_v3_min = meas_v3; 
        if( meas_v3_max < meas_v3 )  meas_v3_max = meas_v3;
        if( meas_v4_min > meas_v4 )  meas_v4_min = meas_v4; 
        if( meas_v4_max < meas_v4 )  meas_v4_max = meas_v4;
        // Display values
        printf("measure 1 = %f = %4.0f mV = %5.0f uA = %5.0f lux delta = %5.0f  \n", meas_r1, meas_v1, meas_v1/10.0, meas_v1/5.0, meas_v1_max - meas_v1_min);
        printf("measure 2 = %f = %4.0f mV = %5.0f uA = %5.0f lux delta = %5.0f  \n", meas_r2, meas_v2, meas_v2/10.0, meas_v2/5.0, meas_v2_max - meas_v2_min);
        printf("measure 3 = %f = %4.0f mV = %5.0f uA = %5.0f lux delta = %5.0f  \n", meas_r3, meas_v3, meas_v3/10.0, meas_v3/5.0, meas_v3_max - meas_v3_min);
        printf("measure 4 = %f = %4.0f mV = %5.0f uA = %5.0f lux delta = %5.0f  \n", meas_r4, meas_v4, meas_v4/10.0, meas_v4/5.0, meas_v4_max - meas_v4_min);
        printf("\033[4A");
        wait(0.1);
    }
}

int LifiRx_AdcRead(int num)
{
//floor(x) - round down
//ceil(x) - round up

    float meas_r1;
    float meas_v1;
    float meas_r2;
    float meas_v2;
    float meas_r3;
    float meas_v3;
    float meas_r4;
    float meas_v4;
    float meas_r_average;
    float meas_v_average;
    int ret = 0;
    switch(num) {
        case LIFI_CHANNEL_1:
            meas_r1 = adc_1.read() ;
            meas_v1 = meas_r1 * 3300;
            ret = ceil(meas_v1);
            break;
        case LIFI_CHANNEL_2:
            meas_r2 = adc_2.read() ;
            meas_v2 = meas_r2 * 3300;
            ret = ceil(meas_v2);
            break;
        case LIFI_CHANNEL_3:
            meas_r3 = adc_3.read() ;
            meas_v3 = meas_r3 * 3300;
            ret = ceil(meas_v3);
            break;
        case LIFI_CHANNEL_4:
            meas_r4 = adc_4.read() ;
            meas_v4 = meas_r4 * 3300;
            ret = ceil(meas_v4);
            break;
        case LIFI_CHANNEL_ALL:
        default:
            meas_r1 = adc_1.read(); // Read the analog input value (value from 0.0 to 1.0 = full ADC conversion range)
            meas_v1 = meas_r1 * 3300; // Converts value in the 0V-3.3V range
            meas_r2 = adc_2.read(); // Read the analog input value (value from 0.0 to 1.0 = full ADC conversion range)
            meas_v2 = meas_r2 * 3300; // Converts value in the 0V-3.3V range
            meas_r3 = adc_3.read(); // Read the analog input value (value from 0.0 to 1.0 = full ADC conversion range)
            meas_v3 = meas_r3 * 3300; // Converts value in the 0V-3.3V range
            meas_r4 = adc_4.read(); // Read the analog input value (value from 0.0 to 1.0 = full ADC conversion range)
            meas_v4 = meas_r4 * 3300; // Converts value in the 0V-3.3V range
            meas_r_average =  ( meas_r1 + meas_r2 + meas_r3 + meas_r4 ) / 4 ;
            meas_v_average =  meas_r_average * 3300;
            ret = ceil(meas_v_average);
            break;
    }
    return ret;
}

void LifiRx_Run()
{
    printf("\n======== LifiRx_Run =========\n");
#if USE_LOCAL_TICKER
    Ticker lifi_rx_timer;
#endif
//    us_timestamp_t us_time;

    LifiRx_Init();
    printf("Tx Symbol Feq=%f sec / %d us \n",LIFI_RX_SYMBOL_PERIOD_SEC,LIFI_RX_SYMBOL_PERIOD_US);
    printf("Rx Sample Feq=%f sec / %d us \n",LIFI_RX_SYMBOL_SAMPLE_PERIOD_SEC,LIFI_RX_SYMBOL_SAMPLE_PERIOD_US);
    printf("Rx Sample/Symbol=%d times / adc edge threshod=%d mV \n",LIFI_RX_SAMPLE_PER_SYMBOL,LIFI_RX_EDGE_THRESHOLD);
    printf("MIMO LIFI_MIMO_CHANNEL_NUM=%d  / LIFI_ACTUAL_MAX_CHANNEL_NUM=%d \n",LIFI_MIMO_CHANNEL_NUM,LIFI_ACTUAL_MAX_CHANNEL_NUM);
    printf("Tx interval = %d sec \n",LIFI_DEMO_TX_PERIOD_SEC);
    
    lifi_rx_timer.attach(&LifiRx_SampleSignalEdge, LIFI_RX_SYMBOL_SAMPLE_PERIOD_SEC);
    printf("1"); 
//    us_time = LIFI_RX_SYMBOL_SAMPLE_PERIOD_US;
//    lifi_rx_timer.attach_us(&LifiRx_SampleSignalEdge, us_time);
    //////// main loop ///////
    buttonInitSkipLoop();
    //printf("2"); 
    while(1) {
        //printf("3"); 
        if( buttonCanSkipLoop() ) return;
        LifiRx_LoopOOK();
        //printf("4"); 
        //wait_ms(50);
    }
}

//////////////

#if USE_MBED_OS5 
// https://os.mbed.com/blog/entry/Simplify-your-code-with-mbed-events/
// create an event queue
#if USE_LIFI_RX_CHECK_QUEUE
EventQueue queue;
EventQueue lifi_tx_check_queue(32 * EVENTS_EVENT_SIZE);
#endif

void do_something() {
  // this now runs in the context of eventThread, instead of in the ISR
  //printf("!");
  LifiRx_SampleSignalEdge();
}



void LifiRx_RunWithEventQueue()
{
   
#if USE_LOCAL_TICKER
    Ticker lifi_rx_timer;
#endif

  // create a thread that'll run the event queue's dispatch function
  Thread eventThread(osPriorityHigh);
  //Thread eventThread;
  eventThread.start(callback(&queue, &EventQueue::dispatch_forever));
  
#if (USE_MBED_OS5 && USE_LIFI_RX_CHECK_QUEUE)
  Thread lifiRxCheckThread(osPriorityNormal);
  lifiRxCheckThread.start(callback(&lifi_tx_check_queue, &EventQueue::dispatch_forever));
#endif
    
    printf("\n======== LifiRx_RunWithEventQueue =========\n");
    LifiRx_Init();
    printf("Tx Symbol Feq=%f sec / %d us \n",LIFI_RX_SYMBOL_PERIOD_SEC,LIFI_RX_SYMBOL_PERIOD_US);
    printf("Rx Sample Feq=%f sec / %d us \n",LIFI_RX_SYMBOL_SAMPLE_PERIOD_SEC,LIFI_RX_SYMBOL_SAMPLE_PERIOD_US);
    printf("Rx Sample/Symbol=%d times / adc edge threshod=%d mV \n",LIFI_RX_SAMPLE_PER_SYMBOL,LIFI_RX_EDGE_THRESHOLD);
    printf("MIMO LIFI_MIMO_CHANNEL_NUM=%d  / LIFI_ACTUAL_MAX_CHANNEL_NUM=%d \n",LIFI_MIMO_CHANNEL_NUM,LIFI_ACTUAL_MAX_CHANNEL_NUM);
    printf("Tx interval = %d sec \n",LIFI_DEMO_TX_PERIOD_SEC);
    
    lifi_rx_timer.attach(queue.event(&do_something), LIFI_RX_SYMBOL_SAMPLE_PERIOD_SEC);
//    us_time = LIFI_RX_SYMBOL_SAMPLE_PERIOD_US;
//    lifi_rx_timer.attach_us(&LifiRx_SampleSignalEdge, us_time);
    //////// main loop ///////
    buttonInitSkipLoop();
    //printf("2"); 
    while(1) {
#if  (USE_LIFI_RX_CHECK_QUEUE==0)   
        //printf("3");      
        if( buttonCanSkipLoop() ) return;
        LifiRx_LoopOOK();
        //printf("4"); 
#endif        
        wait_ms(50);
        if( buttonCanSkipLoop() ) return;
    }
}

#endif