/*
   Copyright (c) 2015, Digi International Inc.

   Permission to use, copy, modify, and/or distribute this software for any
   purpose with or without fee is hereby granted, provided that the above
   copyright notice and this permission notice appear in all copies.

   THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/************************************************************************

	  Samples\Jackrab\jriotest.c

     Program to demonstrate JackRabbit I/O drivers

     This program exercises the JackRabbit's 4 digital output channels,
     the 2 analog output channels, and the one analog input channel.For
     more details, read the following library functions decriptions in
     the user manual:

					jrioInit
					digOut
					anaOut
					anaIn

*************************************************************************/
//  Set a default of declaring all local variables "auto" (on stack)
#class auto


// General use milli-sec delay function
nodebug
void msDelay(unsigned int delay)
{
	auto unsigned long done_time;
	
	done_time = MS_TIMER + delay;
   while( (long) (MS_TIMER - done_time) < 0 );
} 

void main()
{
	auto char i;
	auto int	j;
	auto int	value;
		
	
	/////////////////////////////////////////////////////////////////////
	// initialize drivers - necessary!

	jrioInit();

	
	/////////////////////////////////////////////////////////////////////
	// test digital outputs
	// 	all four digital outputs should pulse up and down 250 times
	
	printf("Testing digital outputs\n");

	for (j=1; j<=500; j++) {
		digOut(0, j%2);
		digOut(1, j%2);
		digOut(2, j%2);
		digOut(3, j%2);
		msDelay(10);
	}


	/////////////////////////////////////////////////////////////////////
	// test D/A channel 0
	//		channel DA0 should gradually increase voltage, from about 130mV
	//		up to 3.0 volts.

	printf("Testing analog output 0\n");		// note this printf is NOT
															// used during analog output!
	
	for (j=PWM_MIN; j<PWM_MAX0; j++) {
		anaOut(0, j);
		msDelay(10);
	}	
	// turn channel back off to minimize CPU use
	anaOut(0, 0);


	/////////////////////////////////////////////////////////////////////
	// test D/A channel 1
	//		channel DA1 should gradually increase voltage, from about 90mV
	//		up to 3.7 volts.

	printf("Testing analog output 1\n");		// note this printf is NOT
															// used during analog output!
	
	for (j=PWM_MIN; j<PWM_MAX1; j++) {
		anaOut(1, j);
		msDelay(10);
	}	
	// turn channel back off to minimize CPU use
	anaOut(1, 0);



	/////////////////////////////////////////////////////////////////////
	// test D/A channel 1
	//		if you connect DA1 to AD0, the resulting value should be
	//		around 790...

	printf("Testing analog input AD0\n");		// note this printf is NOT
															// used during analog output!

	anaOut(1, 512);									// DA1 = 512 is about 2.5 volts
	do {
		anaIn(0, &value);

		if (value == -1023) {		// -1023 implies that AD0 is not connected to anything
			printf("value = -1023, AD0 not connected?\n");
			exit(1);
		}
		
	} while (value < 0);					// if negative then result suspect, try again

	printf("value = %d\n", value);				// should be around 768
															//   (~2.5 V on DA0)

	// turn DA1 back off to minimize CPU use
	anaOut(1, 0);
}
