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use USB module of PIC 18F4550

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de zhao
Guest

use USB module of PIC 18F4550

Posted: Fri Oct 17, 2008 5:23 am

I have written code that follows and it not working, can anybody help me? Thanks

Code:

/////////////////////////////////////////////////////////////////////////

//set to 1 to use a PIC's internal USB Peripheral
//set to 0 to use a National USBN960x peripheral
#define __USB_PIC_PERIF__ 1

#if __USB_PIC_PERIF__

#include <18F4550.h>
#fuses HSPLL,PLL2,NOWDT,NOPROTECT,NOLVP,NODEBUG,USBDIV,CPUDIV1,VREGEN
#use delay(clock=48000000)

#endif //endif check to see which peripheral to use

#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)

/////////////////////////////////////////////////////////////////////////////
//
// CCS Library dynamic defines. For dynamic configuration of the CCS Library
// for your application several defines need to be made. See the comments
// at usb.h for more information
//
/////////////////////////////////////////////////////////////////////////////

//Tells the CCS PIC USB firmware to include HID handling code.
#DEFINE USB_HID_DEVICE TRUE

//the following defines needed for the CCS USB PIC driver to enable the TX endpoint 1
// and allocate buffer space on the peripheral
#define USB_EP1_TX_ENABLE USB_ENABLE_INTERRUPT //turn on EP1 for IN bulk/interrupt transfers
#define USB_EP1_TX_SIZE 8 //allocate 8 bytes in the hardware for transmission

//the following defines needed for the CCS USB PIC driver to enable the RX endpoint 1
// and allocate buffer space on the peripheral
#define USB_EP1_RX_ENABLE USB_ENABLE_INTERRUPT //turn on EP1 for OUT bulk/interrupt transfers
#define USB_EP1_RX_SIZE 8 //allocate 8 bytes in the hardware for reception

/////////////////////////////////////////////////////////////////////////////
//
// If you are using a USB connection sense pin, define it here. If you are
// not using connection sense, comment out this line. Without connection
// sense you will not know if the device gets disconnected.
// (connection sense should look like this:
// 100k
// VBUS-----+----/\/\/\/\/\----- (I/O PIN ON PIC)
// |
// +----/\/\/\/\/\-----GND
// 100k
// (where VBUS is pin1 of the USB connector)
//
/////////////////////////////////////////////////////////////////////////////
///only the 18F4550 development kit has this pin

#define USB_CON_SENSE_PIN PIN_B2

/////////////////////////////////////////////////////////////////////////////
//
// Include the CCS USB Libraries. See the comments at the top of these
// files for more information
//
/////////////////////////////////////////////////////////////////////////////

#include <pic18_usb.h> //Microchip 18Fxx5x hardware layer for usb.c

#include "usb_desc_hid.h" //USB Configuration and Device descriptors for this UBS device
#include <usb.c> //handles usb setup tokens and get descriptor reports

/////////////////////////////////////////////////////////////////////////////
//
// usb_debug_task()
//
// When called periodically, displays debugging information over serial
// to display enumeration and connection states. Also lights LED1 based upon
// enumeration and status.
//
/////////////////////////////////////////////////////////////////////////////
void usb_debug_task(void) {
static int8 last_connected;
static int8 last_enumerated;
int8 new_connected;
int8 new_enumerated;

new_connected=usb_attached();
new_enumerated=usb_enumerated();

if (new_connected && !last_connected)
printf("\r\n\nUSB connected, waiting for enumaration...");
if (!new_connected && last_connected)
printf("\r\n\nUSB disconnected, waiting for connection...");
if (new_enumerated && !last_enumerated)
printf("\r\n\nUSB enumerated by PC/HOST");
if (!new_enumerated && last_enumerated)
printf("\r\n\nUSB unenumerated by PC/HOST, waiting for enumeration...");

last_connected=new_connected;
last_enumerated=new_enumerated;
}

void main() {
int8 out_data[20];
int8 in_data[2];

out_data[0]=1;
out_data[1]=2;
usb_init_cs();

while (TRUE) {
usb_task();
usb_debug_task();
if (usb_enumerated()) {
if (usb_kbhit(1)) {
usb_get_packet(1, in_data, 2);
printf("\r\n--> Received data: 0x%X 0x%X",in_data[0],in_data[1]);
if (usb_put_packet(1, out_data, 2, USB_DTS_TOGGLE))
printf("\r\n<-- Sending 2 bytes: 0x%X 0x%X", out_data[0], out_data[1]);
}

delay_ms(1);
}
}
}

Ttelmah
Guest


Posted: Fri Oct 17, 2008 3:04 pm

Start with the simple things. Is your crystal 8MHz?. Have you got the external connection detection wiring present?. Is Windows seeing the device?. Best Wishes

Guest

Posted: Fri Oct 17, 2008 9:17 pm

Ttelmah wrote:

Start with the simple things. Is your crystal 8MHz?. Have you got the external connection detection wiring present?.
Is Windows seeing the device?.

Best Wishes

Thanks for your help. I don't use VBUS connection sense, use 8MHz crystal, and comment out // #define USB_CON_SENSE_PIN PIN_B2, so Window don't remains to detect it. Could you help me? Embarassed

Best Regards

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