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/***************************************************************************//**
* @file
* @brief Debug (DBG) Peripheral API
* @author Energy Micro AS
* @version 3.0.0
*******************************************************************************
* @section License
* <b>(C) Copyright 2012 Energy Micro AS, http://www.energymicro.com</b>
*******************************************************************************
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*
* DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Energy Micro AS has no
* obligation to support this Software. Energy Micro AS is providing the
* Software "AS IS", with no express or implied warranties of any kind,
* including, but not limited to, any implied warranties of merchantability
* or fitness for any particular purpose or warranties against infringement
* of any proprietary rights of a third party.
*
* Energy Micro AS will not be liable for any consequential, incidental, or
* special damages, or any other relief, or for any claim by any third party,
* arising from your use of this Software.
*
******************************************************************************/
#include "em_assert.h"
#include "em_dbg.h"
#include "em_cmu.h"
#include "em_gpio.h"
/***************************************************************************//**
* @addtogroup EM_Library
* @{
******************************************************************************/
/***************************************************************************//**
* @addtogroup DBG
* @brief Debug (DBG) Peripheral API
* @{
******************************************************************************/
/*******************************************************************************
************************** GLOBAL FUNCTIONS *******************************
******************************************************************************/
/***************************************************************************//**
* @brief
* Enable Serial Wire Output (SWO) pin.
*
* @details
* The SWO pin (sometimes denoted SWV, serial wire viewer) allows for
* miscellaneous output to be passed from the Cortex-M3 debug trace module to
* an external debug probe. By default, the debug trace module and pin output
* may be disabled.
*
* Since the SWO pin is only useful when using a debugger, a suggested use
* of this function during startup may be:
* @verbatim
* if (DBG_Connected())
* {
* DBG_SWOEnable(1);
* }
* @endverbatim
* By checking if debugger is attached, some setup leading to higher energy
* consumption when debugger is attached, can be avoided when not using
* a debugger.
*
* Another alternative may be to set the debugger tool chain to configure
* the required setup (similar to the content of this function) by some
* sort of toolchain scripting during its attach/reset procedure. In that
* case, the above suggested code for enabling the SWO pin is not required
* in the application.
*
* @param[in] location
* Pin location used for SWO pin on the application in use.
******************************************************************************/
void DBG_SWOEnable(unsigned int location)
{
int port;
int pin;
EFM_ASSERT(location < AFCHANLOC_MAX);
port = AF_DBG_SWO_PORT(location);
pin = AF_DBG_SWO_PIN(location);
/* Port/pin location not defined for device? */
if ((pin < 0) || (port < 0))
{
EFM_ASSERT(0);
return;
}
/* Ensure auxiliary clock going to the Cortex debug trace module is enabled */
CMU_OscillatorEnable(cmuOsc_AUXHFRCO, true, false);
/* Set selected pin location for SWO pin and enable it */
GPIO_DbgLocationSet(location);
GPIO_DbgSWOEnable(true);
/* Configure SWO pin for output */
GPIO_PinModeSet((GPIO_Port_TypeDef)port, pin, gpioModePushPull, 0);
}
/** @} (end addtogroup DBG) */
/** @} (end addtogroup EM_Library) */
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