/***************************************************************************
   dac_async.c
   Z-World Inc 2003

   This sample program is intended for RabbitNet RN1300 DAC boards.

   Description
   ===========
   This program outputs a voltage that can be read with a voltmeter.
   The output voltage is computed with using the calibration constants
   that are located on the DAC board EEPROM (simulated in Flash).

   The DAC board is setup for Asynchronously mode of operation which
   updates a DAC output at the time its being accessed via the anaOutVolts,
   or anaOut functions. (i.e. anaOutStrobe function is not used to update
   DAC outputs).

   Note: For Synchronously mode of operation, please see the sample
   program dac_sync.c.


	Instructions:
   -------------
   1.Verify that the power supply for the DAC board meets the requirements
     for both your application and the DAC board (i.e. Power supply must be
     3 volts greater than the MAX DAC output voltage range selected).
	2. Connect a voltage meter to an output channel DAC0 - DAC7.
	3. Compile and run this program.
	4. Follow the prompted directions of this program during execution.

  	Note: This program must be compiled to Flash!
***************************************************************************/

#class auto					/* Change local var storage default to "auto" */

#ifndef _FLASH_
#error "This program must be compiled to Flash."
#endif

//////
// Search criteria
//////
#define MATCHFLAG RN_MATCH_PRDID	//set flag to search for product ID
#define MATCHPID  RN1300			//match DAC board product ID 


nodebug
void msDelay(unsigned int delay)
{
	auto unsigned long done_time;

	done_time = MS_TIMER + delay;
   while( (long) (MS_TIMER - done_time) < 0 );
}

//////
// This function for this demonstration only by leaving chip
// select asserted to force a hardware watchdog timeout
//////
int watchdogTimeout(int handle, int regno, char *recdata, int datalen)
{
	auto rn_devstruct *devaddr;
   auto rnDataSend ds;
   auto rnDataRec dr;
	auto unsigned long done_time;

   // slight delay
   done_time = MS_TIMER + 200;
   while( (long) (MS_TIMER - done_time) < 0 );

	devaddr = (rn_devstruct *)handle;

	//assemble data
   ds.cmd = RCMD|regno;
   memset(ds.mosi, ds.cmd, datalen);
   datalen++;

   // Asserting chip-select and sending a command byte will cause the microcontroller
   // to wait for additional bytes without hitting the Watchdog timer.
	rn_sp_enable(devaddr->portnum);
 	_mosi_driver(datalen, &ds, &dr, &devaddr->cmdtiming, &rn_spi[devaddr->portnum]);

   return (dr.statusbyte);
}


// set the STDIO cursor location and display a string
void DispStr(int x, int y, char *s)
{
   x += 0x20;
   y += 0x20;
   printf ("\x1B=%c%c%s", x, y, s);
}



void  blankScreen(int start, int end)
{
	auto char buffer[256];
   auto int i;

   memset(buffer, 0x00, sizeof(buffer));
 	memset(buffer, ' ', sizeof(buffer));
   buffer[sizeof(buffer)-1] = '\0';
   for(i=start; i < end; i++)
   {
   	DispStr(start, i, buffer);
   }
}

//#define nodebug
void main()
{
	auto int device0, status;
 	auto char tmpbuf[24];
   auto char recbyte;
   auto int done, command;
   auto rn_search newdev;
   auto DacCal DacCalTable1;
   auto float voltout;
   auto int channel, chSelected, selectChannel;
   auto int key;

	brdInit();		// Required for controllers
   rn_init(RN_PORTS, 1);      //initialize controller RN ports

   //search for device match
	newdev.flags = MATCHFLAG;
	newdev.productid = MATCHPID;
   if ((device0 = rn_find(&newdev)) == -1)
   {
   	printf("\n no device found\n");
      exit(0);
   }


	for(;;)
	{
   	blankScreen(0, 30);

		DispStr(2, 2, "DAC Board   CH0&1   CH2-7 ");
		DispStr(2, 3, "--------------------------");

		DispStr(2, 4, "Config = 0  2.5v    10v");
		DispStr(2, 5, "Config = 1  5.0v    10v");
		DispStr(2, 6, "Config = 2  10v     10v");
		DispStr(2, 7, "Config = 3  5v      20v");
		DispStr(2, 8, "Config = 4  10v     20v");
		DispStr(2, 9, "Config = 5  20v     20v");
		DispStr(2, 10, "Please enter the DAC configuration 0 - 5....");
		do
		{
			command = getchar();
		} while (!((command >= '0') && (command <= '5')));
		printf("Config  = %d", command-=0x30);
      rn_anaOutConfig(device0, command, 0, 0);
      for(channel=0; channel < 8; channel++)
      {
      	rn_anaOutRdCalib(device0, channel, &DacCalTable1, 0);
      }
     	done = FALSE;
      selectChannel = TRUE;
		while (!done)
		{
         if(selectChannel)
         {
         	DispStr(2, 12, "DAC0 - DAC7 Voltage Out Program");
				DispStr(2, 13, "-------------------------------");
				DispStr(2, 14, "Please enter an output channel (0 - 7) = ");
				do
				{
		  			channel = getchar();
				} while (!((channel >= '0') && (channel <= '7')));
				printf("%d", channel-=0x30);
            chSelected = channel;
            selectChannel = FALSE;
         }

         // display DAC voltage message
			DispStr(2, 16, "Type a desired voltage (in Volts) =  ");

			// get user voltage value for the DAC thats being monitored
			voltout = atof(gets(tmpbuf));

 			// send voltage value to DAC for it to output the voltage
     		rn_anaOutVolts(device0, chSelected,  voltout, &DacCalTable1, 0);
			DispStr(2, 17, "Observe voltage on meter.....");

			// display user options
			DispStr(2, 19, "User Options:");
			DispStr(2, 20, "-------------");
			DispStr(2, 21, "1. Change the voltage on current DAC channel");
  			DispStr(2, 22, "2. Change to another DAC channel");
			DispStr(2, 23, "3. Change overall DAC output configuration");
			DispStr(2, 24, "4. Software Reset...No change on DAC outputs, keeps configuration");
         DispStr(2, 25, "5. Hardware Reset...All outputs go to ~0 volts, must re-configure DAC");


			while(1)
			{
				// wait for a key to be pressed
				while(!kbhit());
				key = getchar();
            if(key == '1')
				{
   				// empty the keyboard buffer and clear user options
   				while(kbhit()) getchar();
               blankScreen(16, 30);
   				break;
   			}
            if(key == '2')
				{
   				// empty the keyboard buffer and clear user options
   				while(kbhit()) getchar();
               blankScreen(12, 30);
               selectChannel = TRUE;
   				break;
   			}

				if(key == '3')
				{
					// exit while loop and clear previous calibration infor
					done = TRUE;
  					blankScreen(15, 30);
					// empty keyboard buffer
					while(kbhit()) getchar();
					break;
				}
				if (key == '4')
				{
                // first set SW watchdog timeout
					rn_sw_wdt(device0, 2.5);

   				// then enable SW watchdog
					rn_enable_wdt(device0, 2);

               DispStr(2, 28, "Waiting for Software reset");
            	msDelay(3000);

            	// reading clears reset status register
					status = rn_rst_status(device0, &recbyte);
            	if ((status&0x01) && (recbyte&0x40))    //check SW RST bit set
            	{
				  		DispStr(2, 29, "Software reset occurred as expected");
            	}
               else
               {
                  DispStr(2, 29, " Error! Software reset did not occur as expected");
               }
               msDelay(2000);
               DispStr(2, 28, "                                                            ");
               DispStr(2, 29, "                                                            ");

    			}
            if (key == '5')
				{
            	rn_enable_wdt(device0, 1);  //enable device hardware watchdog

                // Force watchdog timeout
 					watchdogTimeout(device0, 0000, &recbyte, 1);
               DispStr(2, 28, "Waiting for Watchdog hardware reset");
            	msDelay(2000);

               // Check if watchdog timeout occurred
               status = rn_rst_status(device0, &recbyte);
         		if ((status&0x01) && (recbyte&0x80))	//check watchdog timeout bit set
         		{
         	  			DispStr(2, 29, "Watchdog hardware reset occurred as expected");
               }
               else
               {
                  DispStr(2, 29, "Error! Watchdog hardware reset did not occur as expected");
               }
               msDelay(2000);
               DispStr(2, 30, "Re-initializing DAC outputs to selected configuration");
               rn_anaOutConfig(device0, command, 0, 0);
      			for(channel=0; channel < 8; channel++)
      			{
      				rn_anaOutRdCalib(device0, channel, &DacCalTable1, 0);
      			}
               msDelay(4000);
               DispStr(2, 28, "                                                                 ");
               DispStr(2, 29, "                                                                 ");
               DispStr(2, 30, "                                                                 ");

             }
			}
		}
	}
}