Sending Waveform Calculations to Logic Analyzer using Analog: STM32F103RB Board

We are trying to generate via code a sawtooth waveform and output a graph of it to the logic analyzer. The calculations for the sawtooth equation are more or less done. We just don't know how to use a gpio analog port to display it on the logic analyzer. 

This is the code:

void sawtooth (void const *argument)
{
    float amplitude;    // peak-to-peak amplitude
    float frequency;    // output frequency in Hz
    float offset;       // amplitude offset
    float duration;     // duration in Seconds
    float val;
  
    int state;
    osEvent  result;
    for(;;)
    {
        result = osSignalWait (0x00,0);
        switch(result.value.v)
        {
            case 1:
                SendText("Running sawtooth \n\n");
                state = 1;
                break;
            case 2:
                state = 2;
                break;
            default:
                break;
        }
        switch(state)
        {
            case 1:
              //Code for waveform generation goes here
                osThreadSetPriority(T_uartThread, osPriorityHigh);
                break;
            case 2:
                break;
            default:
                break;
        }
    }
}

We are aware that the following code exists on Keil's website but it does not work on the board we are required to use.

/*---------------------------------------------------*/
/* Generate Sawtooth Signal on AD Channel 1         */
/*---------------------------------------------------*/
//
SIGNAL void AIN1_Saw (void)  {
  float volts;        // peak-to-peak volatage
  float frequency;    // output frequency in Hz
  float offset;       // volatge offset
  float duration;     // duration in Seconds
  float val;
  long  i, end, steps;

  volts     = 2.0;
  offset    = 0.2;
  frequency = 1400;
  duration  = 0.2;

  printf ("Sawtooth Signal on AD Channel 1.\n");

  steps = (100000 * (1/frequency));
  end = (duration * 100000);
  for (i = 0 ; i < end; i++)  {
    val = (i % steps) / ((float) steps);
    AIN1 = (val * volts) + offset;
    swatch (0.00001);                // in 10 uSec increments
  }
}

DEFINE BUTTON "AIN1 Saw","AIN1_Saw()"