133 lines
4.6 KiB
C
133 lines
4.6 KiB
C
/***************************************************************************//**
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* @file
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* @brief Debug (DBG) Peripheral API
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*******************************************************************************
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* # License
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* <b>Copyright 2018 Silicon Laboratories Inc. www.silabs.com</b>
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*******************************************************************************
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*
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* SPDX-License-Identifier: Zlib
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*
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* The licensor of this software is Silicon Laboratories Inc.
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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*
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******************************************************************************/
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#include "em_dbg.h"
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#if defined(CoreDebug_DHCSR_C_DEBUGEN_Msk)
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#include "sl_assert.h"
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#include "em_cmu.h"
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#include "em_gpio.h"
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#include "em_msc.h"
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/***************************************************************************//**
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* @addtogroup dbg DBG - Debug
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* @brief Debug (DBG) Peripheral API
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* @details
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* This module contains functions to control the DBG peripheral of Silicon
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* Labs 32-bit MCUs and SoCs. The Debug Interface is used to program and debug
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* Silicon Labs devices.
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* @{
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******************************************************************************/
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/*******************************************************************************
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************************** GLOBAL FUNCTIONS *******************************
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******************************************************************************/
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#if defined(GPIO_ROUTE_SWOPEN) || defined(GPIO_ROUTEPEN_SWVPEN) \
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|| defined(GPIO_TRACEROUTEPEN_SWVPEN)
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/***************************************************************************//**
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* @brief
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* Enable Serial Wire Output (SWO) pin.
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*
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* @details
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* The SWO pin (sometimes denoted SWV, serial wire viewer) allows for
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* miscellaneous output to be passed from the Cortex-M3 debug trace module to
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* an external debug probe. By default, the debug trace module and pin output
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* may be disabled.
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*
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* Since the SWO pin is only useful when using a debugger, a suggested use
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* of this function during startup may be:
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* @verbatim
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* if (DBG_Connected())
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* {
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* DBG_SWOEnable(1);
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* }
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* @endverbatim
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* By checking if the debugger is attached, a setup leading to a higher energy
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* consumption when the debugger is attached can be avoided when not using
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* a debugger.
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*
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* Another alternative may be to set the debugger tool chain to configure
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* the required setup (similar to the content of this function) by some
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* sort of toolchain scripting during its attach/reset procedure. In that
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* case, the above suggested code for enabling the SWO pin is not required
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* in the application.
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*
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* @param[in] location
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* A pin location used for SWO pin on the application in use.
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******************************************************************************/
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void DBG_SWOEnable(unsigned int location)
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{
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int port;
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int pin;
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#if defined(GPIO_SWV_PORT)
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port = GPIO_SWV_PORT;
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pin = GPIO_SWV_PIN;
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#else
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EFM_ASSERT(location < AFCHANLOC_MAX);
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#if defined (AF_DBG_SWO_PORT)
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port = AF_DBG_SWO_PORT(location);
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pin = AF_DBG_SWO_PIN(location);
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#elif defined (AF_DBG_SWV_PORT)
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port = AF_DBG_SWV_PORT(location);
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pin = AF_DBG_SWV_PIN(location);
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#else
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#warning "AF debug port is not defined."
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#endif
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#endif
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/* Port/pin location not defined for the device. */
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if ((pin < 0) || (port < 0)) {
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EFM_ASSERT(0);
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return;
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}
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/* Ensure that the auxiliary clock going to the Cortex debug trace module is enabled. */
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#if !defined(_SILICON_LABS_32B_SERIES_2)
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CMU_OscillatorEnable(cmuOsc_AUXHFRCO, true, false);
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#endif
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/* Set the selected pin location for the SWO pin and enable it. */
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GPIO_DbgLocationSet(location);
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GPIO_DbgSWOEnable(true);
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/* Configure the SWO pin for output. */
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GPIO_PinModeSet((GPIO_Port_TypeDef)port, pin, gpioModePushPull, 0);
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}
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#endif
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/** @} (end addtogroup dbg) */
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#endif /* defined( CoreDebug_DHCSR_C_DEBUGEN_Msk ) */
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