USB doesn't work when i initialize TIMER

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I'm using Atmel Studio 7 and the board that i'm generating the code is XMEGA A3BU XPLAINED BOARD.

The code is mainly from  USB and TIMER Quick Start Guide, because i use Atmel ASF.

I want to use USB and TIMER at the same time but i'm having trouble, if I initialize TIMER, USB doesn't work (doesn't shows in COM port). I think the problem is in this line 

tc_write_clock_source(&TCC0, TC_CLKSEL_DIV1024_gc);

somehow this line override my clock for USB and because of that USB doesn't work. I tried comment that line and then USB worked.

Anybody have any suggestion how could I get USB and TIMER that calls function every few second to work ?

Thank you in advance.
 

My code is 

/*
 *	\file
 *
 *	@brief User application.
 *
 *	@author Matjaz Strancar (matjaz@strancar.info)
 *
 *	Copyright (c) 2017-2018 Matjaz Strancar. All rights reserved.
 */

/***************************************************************************************
*				include DIRECTIVES
***************************************************************************************/
#include <asf.h>

/* Timer #DEFINE */
#define MY_TIMER  TCC0

/***************************************************************************************
*				FUNCTIONS 
***************************************************************************************/

/* FUNCTION prototypes*/
void my_vbus_action(bool b_high);
void usb_init(void);
static void tc_init(void);
static void my_callback(void);

/*
 *	@brief USB ATTACH/DETACH
 *
 *	@details Function that attaches/detaches DataLogger USB when Vbus is  
 *			at certain level.
 */
void my_vbus_action(bool b_high)
{
	if(b_high)
	{
		udc_attach();	/* Detach USB device */
	}
	else
	{
		udc_detach();	/* Attach USB device */
	}
}

/*
 *	@brief USB initialization
 *
 *	@details Function stdio_usb_init() ans stdio_usb_enable() 
 *			enables use of printf();
 */
void usb_init(void)
{
	// udc_start();
	stdio_usb_init();
	stdio_usb_enable();
}


/*
 *	@brief TIMER initialization
 *
 */
static void tc_init(void)
{
	tc_enable(&TCC0);
	tc_set_overflow_interrupt_callback(&TCC0, my_callback);
	tc_set_wgm(&TCC0, TC_WG_NORMAL);
	tc_write_period(&TCC0, 1000);
	tc_set_overflow_interrupt_level(&TCC0, TC_INT_LVL_LO);
	//cpu_irq_enable();
	tc_write_clock_source(&TCC0, TC_CLKSEL_DIV1024_gc);
}


static void my_callback(void)
{
	// User code to execute when the overflow occurs here
	printf("We are in callback function \r\n");
	delay_ms(1000);
	
	//Important to clear Interrupt Flag
	tc_clear_overflow(&MY_TIMER);
}

/*
 *  @brief Main routine
 *
 *
 */
int main(void)
{		
	sysclk_init();
	
	/* I/O pins Initialization */
	board_init();
	
	/* USB initialization */
	usb_init();
	my_vbus_action(true);
	irq_initialize_vectors();  // Authorize interrupts
	/* Timer */
	tc_init();
	cpu_irq_enable();


	while(1)
	{	
		printf("Hello Word \r\n");
		delay_ms(1000);
	}
}

 

my conf_clock.h file is:

/**
 * \file
 *
 * \brief Chip-specific system clock manager configuration
 *
 * Copyright (c) 2011-2015 Atmel Corporation. All rights reserved.
 *
 * \asf_license_start
 *
 * \page License
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * 3. The name of Atmel may not be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * 4. This software may only be redistributed and used in connection with an
 *    Atmel microcontroller product.
 *
 * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
 * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * \asf_license_stop
 *
 */
/*
 * Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
 */
#ifndef CONF_CLOCK_H_INCLUDED
#define CONF_CLOCK_H_INCLUDED

//#define CONFIG_SYSCLK_SOURCE          SYSCLK_SRC_RC2MHZ
#define CONFIG_SYSCLK_SOURCE        SYSCLK_SRC_RC32MHZ
//#define CONFIG_SYSCLK_SOURCE        SYSCLK_SRC_RC32KHZ
//#define CONFIG_SYSCLK_SOURCE        SYSCLK_SRC_XOSC
//#define CONFIG_SYSCLK_SOURCE        SYSCLK_SRC_PLL

/* Fbus = Fsys / (2 ^ BUS_div) */
#define CONFIG_SYSCLK_PSADIV          SYSCLK_PSADIV_2
#define CONFIG_SYSCLK_PSBCDIV         SYSCLK_PSBCDIV_1_1

//#define CONFIG_PLL0_SOURCE          PLL_SRC_XOSC
//#define CONFIG_PLL0_SOURCE          PLL_SRC_RC2MHZ
//#define CONFIG_PLL0_SOURCE          PLL_SRC_RC32MHZ

/* Fpll = (Fclk * PLL_mul) / PLL_div */
//#define CONFIG_PLL0_MUL             (24000000UL / BOARD_XOSC_HZ)
//#define CONFIG_PLL0_DIV             1

/* External oscillator frequency range */
/** 0.4 to 2 MHz frequency range */
//#define CONFIG_XOSC_RANGE XOSC_RANGE_04TO2
/** 2 to 9 MHz frequency range */
//#define CONFIG_XOSC_RANGE XOSC_RANGE_2TO9
/** 9 to 12 MHz frequency range */
//#define CONFIG_XOSC_RANGE XOSC_RANGE_9TO12
/** 12 to 16 MHz frequency range */
//#define CONFIG_XOSC_RANGE XOSC_RANGE_12TO16

/* DFLL autocalibration */
//#define CONFIG_OSC_AUTOCAL_RC2MHZ_REF_OSC  OSC_ID_RC32KHZ
//#define CONFIG_OSC_AUTOCAL_RC32MHZ_REF_OSC OSC_ID_XOSC

/* The following example clock configuration definitions can be used in XMEGA
 * devices that contain a USB controller. It configures the USB controller clock
 * source to use the internal (nominally) 32MHz RC oscillator, up-calibrated to
 * run at 48MHz via the periodic 1ms USB Start Of Frame packets sent by the
 * host. The USB controller requires 48MHz for Full Speed operation, or 6MHz
 * for USB Low Speed operation.
 *
 * Note that when the 32MHz RC oscillator is tuned to 48MHz, it cannot be used
 * directly as the system clock source; it must either be prescaled down to a
 * speed below the maximum operating frequency given in the datasheet, or an
 * alternative clock source (e.g. the internal 2MHz RC Oscillator, multiplied
 * to a higher frequency via the internal PLL module) must be used instead.
 */
#define CONFIG_USBCLK_SOURCE                USBCLK_SRC_RCOSC
#define CONFIG_OSC_RC32_CAL                 48000000UL
#define CONFIG_OSC_AUTOCAL_RC32MHZ_REF_OSC  OSC_ID_USBSOF

/* Use to enable and select RTC clock source */
//#define CONFIG_RTC_SOURCE           SYSCLK_RTCSRC_ULP

#endif /* CONF_CLOCK_H_INCLUDED */

 

This topic has a solution.
Last Edited: Thu. Feb 1, 2018 - 08:26 AM
This reply has been marked as the solution. 
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A 1000ms delay inside an ISR (from which your callback is called) is bound to break things.

 

Greg Muth

Portland, OR, US

Xplained/Pro/Mini Boards mostly

 

 

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You are right... I don't know what i was thinking...

I have deleted that delay from there and I have changed how frequently timer calls a callback function.
Thank you Greg_Muth !

 

Best regards,
Matjaz