File content as of revision 0:03153e3cb89f:

#include "mbed.h"
#include "IIR_filter.h"

/*  Notes pmic 13.08.2019:
  -
*/

// nt baudrate = 115200;
Serial pc(SERIAL_TX, SERIAL_RX);  // serial connection via USB - programmer
Timer t;                          // timer to analyse Button
Timer twhile;                     // timer for time measurement (usage in while(1), without timer attached)


Serial TFmini(PC_10, PC_11);  // TX, RX
int dist;               //actual distance measurements of LiDAR
int strength;           //signal strength of LiDAR
int check;              //save check value
int i;
char uart[9];            //save data measured by LiDAR
const int HEADER=0x59;  //frame header of data package

volatile char c;

void onCharReceived()
{
    c = TFmini.getc();
}

int k;
bool was_readable;
// float Ts = 0.05f;                 // ??? sample time of main loop, 20 Hz

// IIR_filter pt1(0.2f, Ts, 1.0f);
// float distf = 0.0f;
// float strengthf = 0.0f;

// main program and control loop
// -----------------------------------------------------------------------------
int main()
{
    pc.baud(115200);                   // for serial comm. to pc
    TFmini.baud(115200);               // for serial comm. from TFmini
    k = 0;

    TFmini.attach(&onCharReceived, Serial::RxIrq);
    // was_readable = false;

    //pt1.reset(0.0f);
    twhile.start(); // timer for time measurement (usage in while(1), without timer attached)
    while(1) {
        
        was_readable = true;
        
        if (TFmini.readable()) {  //check if serial port has data input
            was_readable = true;
            /*if(TFmini.getc() == HEADER) {  //assess data package frame header 0x59
                uart[0]=HEADER;
                if (TFmini.getc() == HEADER) { //assess data package frame header 0x59
                    uart[1] = HEADER;
                    for (i = 2; i < 9; i++) { //save data in array
                        uart[i] = TFmini.getc();
                    }
                    check = uart[0] + uart[1] + uart[2] + uart[3] + uart[4] + uart[5] + uart[6] + uart[7];
                    if (uart[8] == (check & 0xff)) { //verify the received data as per protocol
                        dist = uart[2] + uart[3] * 256;     //calculate distance value
                        strength = uart[4] + uart[5] * 256; //calculate signal strength value
                    }
                }
            }*/
        } else {
            was_readable = false;
        }

        // distf = pt1((float)dist);
        k++;
        // if(was_readable) pc.printf("%10i was readable\r\n", k);
        // else pc.printf("%10i was not readable\r\n", k);
        // if( TFmini.readable()) pc.printf("%10i %10i\r\n", k, TFmini.getc());
        pc.printf("%10i %10i\r\n", k, (int)c);
        //pc.printf("%10i %10.6e %10i\r\n", k, twhile.read(), dist);
        //wait_ms(100);
    }
}