title: error: lvalue required as left operand of assignment, error: void value not ignored as it ought to be
body: <p>Im getting these errors:</p>
  
  <pre><code>error: lvalue required as left operand of assignment
  error: void value not ignored as it ought to be
  </code></pre>
  
  <p>Basically I have a i2c capacitive touch controller that I am constantly scanning then checking the scanned data and then doing an d actions if required then repeating.</p>
  
  <p>Here is my code:</p>
  
  <pre><code>#include &lt;avr/io.h&gt;
  #include &lt;util/delay.h&gt; 
  #include "i2cmaster.h"
  
  #define mpr03x 0x4A
  
  int main(void)
  {
      unsigned char tou;
  
      DDRA = 0xff;
      DDRB = 0xff;
      PORTA = 0x03;
      _delay_ms(500);
      PORTA = 0x00;
  
      i2c_init();     //Initialize I2C
  
      i2c_start_wait(mpr03x+I2C_WRITE);   //Set device address and write mode
      i2c_write(0x44);                    //Write address = 68
      i2c_write(0x03);                    //Calibration = ON, Runmode = 1, Enabled = ELE0, ELE1, ELE2
  
      while(1)
      {
          PORTA = 0x01;
          i2c_start_wait(mpr03x=I2C_WRITE);   //Set device address and write mode
          i2c_write(0x00);                    //Write address = 68
          i2c_rep_start(mpr03x+I2C_READ);     // set device address and read mode
          tou = i2c_readNak;
          i2c_stop;
  
          if(tou == 0x00);                    //If no pads are pressed
          {
              PORTA = 0x00;
              _delay_ms(1);
          }
          else
          {
              if(tou == 0x01);                //If pad 1 is pressed
              {
                  PORTA = 0x05;
                  if(tou == 0x02);            //If pad 2 is pressed
                  {
                      PORTA = 0x09;
                      if(tou == 0x03);        //If pad 3 is pressed
                      {
                          PORTA = 0x11;
                          _delay_ms(1000);
                      }
                  }
                  else
                  {
                      if(tou == 0x02);        //If pad 2 is pressed
                      {
                          PORTA = 0x09;
                          if(tou == 0x03);    //If pad 3 is pressed
                          {
                              PORTA = 0x11;
                              _delay_ms(1000);
                          }
                          else
                          {
                              if(tou == 0x03);//If pad 3 is pressed
                              {
                                  PORTA = 0x11;
                                  _delay_ms(1000);
                              }
                          }
                      }
                  }
  
          }
  
      }
  }`
  </code></pre>
  
  <p>Any help would be greatly appreciated.</p>