rt-thread/bsp/efm32/EFM32_Gxxx_DK/trace.c

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/**************************************************************************//**
* @file
* @brief SWO Trace API (for eAProfiler)
* @author Energy Micro AS
* @version 2.0.1
******************************************************************************
* @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.
* 4. The source and compiled code may only be used on Energy Micro "EFM32"
* microcontrollers and "EFR4" radios.
*
* 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 <stdbool.h>
#include "efm32.h"
#include "trace.h"
/***************************************************************************//**
* @addtogroup BSP
* @{
******************************************************************************/
/**************************************************************************//**
* @brief Configure trace output for energyAware Profiler
*****************************************************************************/
void TRACE_SWOSetup(void)
{
uint32_t *dwt_ctrl = (uint32_t *) 0xE0001000;
uint32_t *tpiu_prescaler = (uint32_t *) 0xE0040010;
uint32_t *tpiu_protocol = (uint32_t *) 0xE00400F0;
/* Enable GPIO clock */
CMU->HFPERCLKEN0 |= CMU_HFPERCLKEN0_GPIO;
/* Enable Serial wire output pin */
GPIO->ROUTE |= GPIO_ROUTE_SWOPEN;
/* Set location 1 */
GPIO->ROUTE = (GPIO->ROUTE & ~(_GPIO_ROUTE_SWLOCATION_MASK)) | GPIO_ROUTE_SWLOCATION_LOC1;
/* Enable output on pin */
GPIO->P[2].MODEH &= ~(_GPIO_P_MODEH_MODE15_MASK);
GPIO->P[2].MODEH |= GPIO_P_MODEH_MODE15_PUSHPULL;
/* Enable debug clock AUXHFRCO */
CMU->OSCENCMD = CMU_OSCENCMD_AUXHFRCOEN;
/* Wait until clock is ready */
while(!(CMU->STATUS & CMU_STATUS_AUXHFRCORDY));
/* Enable trace in core debug */
CoreDebug->DEMCR |= CoreDebug_DEMCR_TRCENA_Msk;
/* Enable PC and IRQ sampling output */
*dwt_ctrl = 0x400113FF;
/* Set TPIU prescaler to 16. */
*tpiu_prescaler = 0xf;
/* Set protocol to NRZ */
*tpiu_protocol = 2;
/* Unlock ITM and output data */
ITM->LAR = 0xC5ACCE55;
ITM->TCR = 0x10009;
}
/**************************************************************************//**
* @brief Profiler configuration
* @return true if energyAware Profiler/SWO is enabled, false if not
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* @note If first word of the user page is zero, this will not
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* enable SWO profiler output, see trace.h
*****************************************************************************/
bool TRACE_ProfilerSetup(void)
{
volatile uint32_t *userData = (uint32_t *) USER_PAGE;
/* Check magic "trace" word in user page */
if(*userData == 0x00000000UL)
{
return false;
}
else
{
TRACE_SWOSetup();
return true;
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}
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}
/** @} (end group BSP) */