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

/**************************************************************************//**
 * @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
 * @note If first word of the user page is zero, this will not 
 *       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;
  }  
}

/** @} (end group BSP) */