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//https://developer.mbed.org/users/borislav/notebook/serial-port-plotter/

#include "mbed.h"


int32_t float_to_int(float f);


int main()
{
    DigitalOut rLed(LED_RED, 1);
    DigitalOut gLed(LED_GREEN, 1);
    DigitalOut bLed(LED_BLUE, 1);

    DigitalOut leds[] = {rLed, gLed, bLed};
    
    Serial debug(USBTX, USBRX);
    debug.baud(115200);
    
    //const float PI = 3.14159265F;
    float angle[] = {0.0F, 120.0F, 240.0F};
    float sinScaled;
    int32_t data[3];
    uint32_t cnt = 0;
    
    while(1)
    {
        //get data
        for(uint32_t idx = 0; idx < 3; idx++)
        {
            //get sin, scaled up and offset above 0
            sinScaled = (100 + (100.0F * sin(angle[idx]*(PI/180.0F))));
            data[idx] = float_to_int(sinScaled);
            
            //inc angle, check for roll over
            angle[idx] += 1.0F;
            if(angle[idx] > 360.0F)
            {
                angle[idx] = 0.0F;
            }
        }
        
        //plot
        debug.printf("$%d %d %d;", data[0], data[1], data[2]);
        
        //blink some lights, just cause you have to
        leds[cnt % 3] = !leds[cnt % 3];
        cnt++;
        
        //wait a bit
        wait(0.01F);
    }
}


int32_t float_to_int(float f)
{
    int32_t i;
    
    if (f >= 0.0F)
    {
        i = static_cast<int32_t>(f + 0.5F); 
    } 
    else 
    {
        i = static_cast<int32_t>(f - 0.5F);
    }
    
    return i;
}