about ex_usb_hid

[macaby]

I tried ex_usb_hid.c in pic16C765 to communicate to PC program (builder CPP3) : 0->1% CPU at 800 bytes /s (multi-thread) : i'm glad. I work with "USB complete" and WinDDK.
But as soon i want to optimize the ex_usb_hid.c , delete line with "printf() .." and other i don't want , the controller freeze in "usb_wait_for_enumeration();"

what's append , i don't understand : i have just delete the serial instruction
If i reactive the lines , the program well run.

/////////////////////////////////////////////////////////////////////////
//// (C) Copyright 1996,2003 Custom Computer Services ////
//// This source code may only be used by licensed users of the CCS ////
//// C compiler. This source code may only be distributed to other ////
//// licensed users of the CCS C compiler. No other use, ////
//// reproduction or distribution is permitted without written ////
//// permission. Derivative programs created using this software ////
//// in object code form are not restricted in any way. ////
/////////////////////////////////////////////////////////////////////////

#define USB_PIC16C765 1 //set to 1 to use a PIC16c765 USB Peripheral
//set to 0 to use a National USBN960x peripheral

#include <16C765.h>
#device *=16
#fuses H4,NOWDT,NOPROTECT,PUT
#use delay(clock=24000000)

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

#DEFINE LED_1 PIN_B5
#DEFINE LED_2 PIN_B4
#DEFINE LED_3 PIN_B3
#DEFINE BUTTON PIN_A4

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

//Set this to FALSE if you only want to test enumeration. Some USB test programs,
//such as USBCHECK, crash if you are trying to test enumeration and the device
//starts sending data once configured.
#DEFINE USB_RUN_WHEN_CONFIGURED TRUE

//the following defines needed for the CCS USB PIC driver to enable the TX endpoint 1
#define USB_EP1_TX_ENABLE 1 //turn on EP1 for IN bulk/interrupt transfers
#define USB_EP1_TX_SIZE 2 //if you change this, be sure to change the hid descriptor

//the following defines needed for the CCS USB PIC driver to enable the RX endpoint 1
#define USB_EP1_RX_ENABLE 1 //turn on EP1 for OUT bulk/interrupt transfers
#define USB_EP1_RX_SIZE 2 //if you change this, be sure to change the hid descriptor

#include "pic_usb.h" //Microchip PIC16C765 hardware layer for usb.c

#include "usb.c" //handles usb setup tokens and get descriptor reports

void main() {
int8 out_data[USB_EP1_TX_SIZE];
int8 in_data[USB_EP1_RX_SIZE];


/*
#ifdef __PCH__
printf("\r\n\r\nPCH: v");
printf(__PCH__);
#else
printf("\r\n\r\nPCM: v");
printf(__PCM__);
#endif
*/

/*
setup_adc(ADC_CLOCK_INTERNAL);
setup_adc_ports(RA0_RA1_RA3_ANALOG);
set_adc_channel(1);
*/

usb_init();

/*
#if !(USB_PIC16C765)
printf("\r\nUSBN: 0x%X\r\n", usbn_get_version());
output_low(LED_1);
output_low(LED_2);
output_low(LED_3);
delay_ms(1000);
output_high(LED_1);
output_high(LED_2);
#else
printf("\r\n");
#ENDIF
*/

// printf("\r\n\r\nWaiting for enumeration...");


output_low(LED_1);
output_low(LED_2);

while (TRUE) {
output_high(LED_1);
usb_wait_for_enumeration();
output_high(LED_2);
// printf("\r\n\r\n***Enumerated***\r\n");
while(usb_enumerated()) {
#IF USB_RUN_WHEN_CONFIGURED
if (usb_kbhit(1)) {
usb_gets(1, in_data, USB_EP1_RX_SIZE);
// printf("\r\n--> Received 2 bytes: 0x%X 0x%X",in_data[0],in_data[1]);
if (in_data[0]) {output_low(LED_1);} else {output_high(LED_1);}
if (in_data[1]) {output_low(LED_2);} else {output_high(LED_2);}
}
// out_data[0]=read_adc();
out_data[1]=!input(BUTTON);
if (usb_put_packet(1, out_data, USB_EP1_TX_SIZE, TOGGLE)) {
// printf("\r\n<-- Sending 2 bytes: 0x%X 0x%X", out_data[0], out_data[1]);
}
output_low(LED_2);
delay_ms(500);
output_high(LED_2);

#ENDIF
}
// printf("\r\n\r\nDevice Un-configured.r\n");
}
}

[macby]

If i append one delay 5ms or less , the sie have time to terminate init and all work fine.
In the example the delay come from the serial I/O

[Mark]

/////////////////////////////////////////////////////////////////////////
//// (C) Copyright 1996,2003 Custom Computer Services ////
//// This source code may only be used by licensed users of the CCS ////
//// C compiler. This source code may only be distributed to other ////
//// licensed users of the CCS C compiler. No other use, ////
//// reproduction or distribution is permitted without written ////
//// permission. Derivative programs created using this software ////
//// in object code form are not restricted in any way. ////
/////////////////////////////////////////////////////////////////////////