Scribd
Upload
300 views3 pages

FLEX Board USB Connection

This demo shows how to set up a USB connection between the PC and the FLEX board. The aim is to control the dsPIC LED and the PIC18 LED system from the host PC. The dsPIC LED is controlled by the SPI communication with the PIC18. The application is divided into three parts: 1. In the first part a brief description of the USB set-up is provided. The aim is to give a brief overview of the USB protocol. 2. The second part concerns the dsPIC side with the use of the SPI connection with the PIC18. 3. The third part concerns the PC side application. You can download a simple application under Windows (XP or Vista) to communicate with FLEX in order to switch on and off both LEDs of dsPIC and PIC18.

Uploaded by

Ionela
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
300 views3 pages

FLEX Board USB Connection

This demo shows how to set up a USB connection between the PC and the FLEX board. The aim is to control the dsPIC LED and the PIC18 LED system from the host PC. The dsPIC LED is controlled by the SPI communication with the PIC18. The application is divided into three parts: 1. In the first part a brief description of the USB set-up is provided. The aim is to give a brief overview of the USB protocol. 2. The second part concerns the dsPIC side with the use of the SPI connection with the PIC18. 3. The third part concerns the PC side application. You can download a simple application under Windows (XP or Vista) to communicate with FLEX in order to switch on and off both LEDs of dsPIC and PIC18.

Uploaded by

Ionela
Copyright
© Attribution Non-Commercial (BY-NC)
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
You are on page 1/ 3

FLEX Board USB connection http://dev.emcelettronica.

com/print/51822

Your Electronics Open Source


(http://dev.emcelettronica.com)
Home > My blog > Content

FLEX Board USB connection


By Ionela
Created 01/07/2008 - 11:51

BLOG Microcontrollers Usb

This demo shows how to set up a USB [1]connection between the PC and the FLEX board [2]. The aim is to control the dsPIC LED
and the PIC18 LED system from the host PC. The dsPIC LED is controlled by the SPI communication with the PIC18.
The application is divided into three parts:
1. In the first part a brief description of the USB set-up is provided. The aim is to give a brief overview of the USB protocol.
2. The second part concerns the dsPIC side with the use of the SPI connection with the PIC18.
3. The third part concerns the PC side application. You can download a simple application under Windows (XP or Vista) to
communicate with FLEX in order to switch on and off both LEDs of dsPIC and PIC18.

/** I N C L U D E S **********************************************************/

#include
#include
#include "system\typedefs.h" // Required
#include "system\usb\usb.h" // Required
#include "io_cfg.h" // Required

#include "system\usb\usb_compile_time_validation.h" // Optional


#include "user\pickit.h"
#include "user\pk_isr.h"

/** V A R I A B L E S ********************************************************/

#pragma udata
char inbuffer[64];

/** P R I V A T E P R O T O T Y P E S ***************************************/

static void InitializeSystem(void);


void USBTasks(void);

/** V E C T O R R E M A P P I N G *******************************************/

extern void _startup (void); // See c018i.c in your C18 compiler dir
#pragma code _RESET_INTERRUPT_VECTOR = 0x002000
void _reset (void)
{
_asm goto _startup _endasm
}

#pragma code _HIGH_INTERRUPT_VECTOR = 0x002008


void _high_ISR (void)
{

1 din 3 02.07.2008 13:21


FLEX Board USB connection http://dev.emcelettronica.com/print/51822

_asm
goto InterruptHandler // jump to interrupt routine
_endasm
}

#pragma code InterruptVectorLow = 0x002018


void InterruptVectorLow (void)
{
_asm
goto InterruptHandler // jump to interrupt routine
_endasm
}

/** D E C L A R A T I O N S **************************************************/

#pragma code

/******************************************************************************
* Function: void main(void)
*
* PreCondition: None
*
* Input: None
*
* Output: None
*
* Side Effects: None
*
* Overview: Main program entry point.
*
* Note: None
*****************************************************************************/
unsigned char ReadSPI( void )
{
SSPBUF = 75; // initiate bus cycle
while ( !SSPSTATbits.BF ); // wait until cycle complete
return ( SSPBUF ); // return with byte read
}

void Process_SPI(void){
if(PORTBbits.RB4 && INTCONbits.RBIF) {
INTCONbits.RBIF=0;
//if(ReadSPI()==0xaa) PORTBbits.RB5=!PORTBbits.RB5;
ReadSPI();
}
}

void ProcessIO(void)
{
unsigned char usb_idx = 0; // index of USB buffer

if (HIDRxReport(inbuffer, 64) > 0) // USB receive buffer has data


{
//PORTBbits.RB5=!PORTBbits.RB5;
// do
// {
switch(inbuffer[usb_idx]) // parse buffer for commands
{
case 1:
//WriteSPI(75); //switch on led
PORTBbits.RB5=1;
break;
case 0:
//WriteSPI(80); //switch off led
PORTBbits.RB5=0;
break;
case 2:
WriteSPI(80); //switch off led
break;
case 3:
WriteSPI(75); //switch on led
break;
default: // End of Buffer or unrecognized command
usb_idx = 64; // Stop processing.
} // end switch
// } while (usb_idx < 64); // end DO

} // end if (HIDRxReport(inbuffer, 64) > 0)

} // end void ProcessIO(void)

void main(void)
{
int i;
InitializeSystem();
for (i=0; i

2 din 3 02.07.2008 13:21


FLEX Board USB connection http://dev.emcelettronica.com/print/51822

For more informations, click here [3]

Trademarks

Source URL: http://dev.emcelettronica.com/flex-board-usb-connection

Links:
[1] http://dev.emcelettronica.com/usb
[2] http://dev.emcelettronica.com/Flex
[3] http://www.evidence.eu.com/content/view/250/266/

3 din 3 02.07.2008 13:21

You might also like