ep3_iso.c

Mitsubishi M30245 SampleCode

/*******************************************************************
 *
 *    DESCRIPTION: M30245 Mit_USB Demonstration Application
 *
 *    AUTHOR: Mitsubishi DEC-E
 *
 *    HISTORY: 0.5 5/30/02 Initial creation for NC30
 *			   1.0 6/18/02 First official release
 *			   1.1 6/27/02 Updated ISO routines
 *			   1.2 8/07/02 Updated for Rev B Starter Kit Board
 *
 *******************************************************************/

// Include Files
#include "sfr245.h"
#include "extern.h"

// Function Prototypes
void ServiceEP3IN(void);
void ServiceEP3OUT(void);

// Variable Declarations
unsigned char FrameCount = 0x00;

/*
 ** ServiceEP3IN
 *
 *  FILENAME: EP3_ISO.c
 *
 *  PARAMETERS: None
 *
 *  DESCRIPTION: When called, loads EP3 IN with data and frame count
 *				 to send to HOST. data is stored in a buffer (EP2Buffer)
 *				 and is actually A/D data repeated 7 times.
 *
 *  RETURNS: Nothing
 *
 */
void ServiceEP3IN(void){

	if ( !USBFlags.Configured ){		// If device is not configured, then don't do this
		return;				// as it will cause problems
	}

	ep3il = FrameCount++;	// load the frame count
	ep3il = EP2Buffer[0];	// and load the data
	ep3il = EP2Buffer[0];	// 
	ep3il = EP2Buffer[0];	// 
	ep3il = EP2Buffer[0];	// 
	ep3il = EP2Buffer[0];	// 
	ep3il = EP2Buffer[0];	// 
	ep3il = EP2Buffer[0];	// 

	ep3ics = 0x0108;		// Set IN_BUF_RDY and ISO bit so send data out
							// ISO bit must be set every time data is transfered
							// using ISO
}

/*
 ** ServiceEP3OUT
 *
 *  FILENAME: EP3_ISO.c
 *
 *  PARAMETERS:
 *
 *  DESCRIPTION:
 *
 *  RETURNS:
 *
 */
void ServiceEP3OUT(void){
unsigned int i,j;

	if ( !USBFlags.Configured ){		// If device is not configured, then don't do this
		return;				// as it will cause problems
	}

	/* Keep track of how many times we have entered this routine. */
	iso_out_xfers++;

	/* read out the number of bytes just sent */
	amount_sent = ep3wcl;

	// read them out of the fifo
	for( i = 0; i < amount_sent; i++ )
	   iso_buffer[i] = ep3ol;

	total_count += amount_sent;

	/* Clear OUT_PKT_RDY bit and set iso bit for endpoint 3    */
	/* NOTE: You MUST set the iso bit every time as done here. */
	ep3ocs = 0x0820;

	/* Send info to the display buffer to get displayed */
	i = 0;		// use to index tmp_buffer

	/* output the mouse coordinates */
	/* the packet format should be....
	   Byte  Value
	   0,1   Packet Count
	   2,3   X Coordinates
	   4,5   Y Coordinates
	*/
	/********* X *********/
	j = iso_buffer[2] * 256;
	j += iso_buffer [3];
	tmp_buffer[ i++ ] = (j / 100) + '0';
	j = j % 100;
	tmp_buffer[ i++ ] = (j / 10) + '0';
	tmp_buffer[ i++ ] = (j % 10) + '0';

	/******** COMMA ********/
	tmp_buffer[ i++ ] = ',';

	/********* Y *********/
	j = iso_buffer[4] * 256;
	j += iso_buffer [5];
	tmp_buffer[ i++ ] = (j / 100) + '0';
	j = j % 100;
	tmp_buffer[ i++ ] = (j / 10) + '0';
	tmp_buffer[ i++ ] = (j % 10) + '0';

	/******* CR LF *******/
	tmp_buffer[ i++ ] = '\n';
	tmp_buffer[ i++ ] = '\r';

	j = 0;
	/* check for buffer roll over */
	if( (next_empty + i) <= 256 ) {
		/* no roll over so just copy straight in */
		for( ; i > 0 ;i-- )
			disp_buffer[ next_empty++ ] = tmp_buffer[j++];
	}
	else {
		/* you must roll over to begining of the buffer */
		for( ; i > 0 ;i-- ) {
			disp_buffer[ next_empty++ ] = tmp_buffer[j++];
			next_empty &= 0xFF;		// this will auto roll you back to the begining
		}
	}
}