197 lines
8.6 KiB
C
197 lines
8.6 KiB
C
/*********************************************************************
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* SEGGER Microcontroller GmbH *
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* The Embedded Experts *
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**********************************************************************
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* *
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* (c) 1995 - 2021 SEGGER Microcontroller GmbH *
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* *
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* www.segger.com Support: support@segger.com *
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* *
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**********************************************************************
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* *
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* SEGGER SystemView * Real-time application analysis *
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* *
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**********************************************************************
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* *
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* All rights reserved. *
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* *
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* SEGGER strongly recommends to not make any changes *
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* to or modify the source code of this software in order to stay *
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* compatible with the SystemView and RTT protocol, and J-Link. *
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* *
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* Redistribution and use in source and binary forms, with or *
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* without modification, are permitted provided that the following *
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* condition is met: *
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* *
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* o Redistributions of source code must retain the above copyright *
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* notice, this condition and the following disclaimer. *
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* *
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND *
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, *
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF *
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE *
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* DISCLAIMED. IN NO EVENT SHALL SEGGER Microcontroller BE LIABLE FOR *
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR *
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT *
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; *
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF *
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT *
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE *
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* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH *
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* DAMAGE. *
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* *
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**********************************************************************
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* *
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* SystemView version: 3.32 *
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* *
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**********************************************************************
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-------------------------- END-OF-HEADER -----------------------------
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File : SEGGER_SYSVIEW_Config_embOS_ARMv7_PMU.c
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Purpose : Sample setup configuration of SystemView with embOS
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on ARMv7-A and ARMv7-R devices that support the Performance
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Monitors Extension and thus have a Performance Monitors
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Unit (PMU) with cycle counter implemented.
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Revision: $Rev: 26224 $
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Additional information:
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The PMU cycle counter provides the most accurate timestamps, because
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the cycle counter increments on each CPU clock cycle. Devices that
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run at high frequencies need to send at least one SystemView event
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each iteration of the 32-Bit counter to prevent unnoticed counter
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overflows. A device running at 1GHz would thus need to send at least
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one event every ~4.29 seconds. If this is not possible, the cycle
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counter can be initialized to increment only each 64th CPU clock cycle.
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SEGGER_SYSVIEW_InterruptId has to be set in the IRQ handler
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to identify the active interrupt.
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*/
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#include "RTOS.h"
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#include "SEGGER_SYSVIEW.h"
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#include "SEGGER_SYSVIEW_embOS.h"
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/*********************************************************************
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*
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* Defines, fixed
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*
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**********************************************************************
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*/
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/*********************************************************************
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*
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* Local functions
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*
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**********************************************************************
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*/
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/*********************************************************************
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*
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* _cbSendSystemDesc()
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*
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* Function description
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* Sends SystemView description strings.
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*/
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static void _cbSendSystemDesc(void) {
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SEGGER_SYSVIEW_SendSysDesc("N=" SEGGER_SYSVIEW_APP_NAME ",O=embOS_Ultra,D=" SEGGER_SYSVIEW_DEVICE_NAME );
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#ifdef SEGGER_SYSVIEW_SYSDESC0
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SEGGER_SYSVIEW_SendSysDesc(SEGGER_SYSVIEW_SYSDESC0);
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#endif
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#ifdef SEGGER_SYSVIEW_SYSDESC1
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SEGGER_SYSVIEW_SendSysDesc(SEGGER_SYSVIEW_SYSDESC1);
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#endif
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#ifdef SEGGER_SYSVIEW_SYSDESC2
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SEGGER_SYSVIEW_SendSysDesc(SEGGER_SYSVIEW_SYSDESC2);
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#endif
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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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**********************************************************************
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*/
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/*********************************************************************
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*
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* SEGGER_SYSVIEW_Conf()
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*
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* Function description
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* Configure and initialize SystemView and register it with embOS.
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*
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* Additional information
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* If enabled, SEGGER_SYSVIEW_Conf() will also immediately start
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* recording events with SystemView.
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*/
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void SEGGER_SYSVIEW_Conf(void) {
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#if (OS_DEBUG != 0)
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unsigned long DebugFeatures;
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//
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// Check if performance monitors extension is supported.
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//
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__asm volatile("mrc P15, 0, %0, C0, C1, 2\n" // Read ID_DFR0
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: "=r" (DebugFeatures)
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:
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: );
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DebugFeatures = (DebugFeatures >> 24) & 0x0Fu; // Extract information about the performance monitors extension
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if (DebugFeatures == 0x0Fu) {
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//
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// ARM performance monitors extension not supported on this device.
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// Another counter needs to be used for this device.
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//
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OS_Error(OS_ERR_HW_NOT_AVAILABLE);
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}
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#endif // (OS_DEBUG != 0)
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//
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// Enable and reset PMU cycle counter.
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// Requires performance monitors extension.
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//
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__asm volatile("mov R12, #0x80000000 \n"
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"mcr P15, 0, R12, C9, C12, 1\n" // Set PMCNTSET.C (PMCCNTR enable bit)
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"mrc P15, 0, R12, C9, C12, 0\n" // Read PMCR (performance counter control register)
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"orr R12, R12, #5 \n" // Set PMCR.E (enables PMU) and PMCR.C (reset PMCCNTR to 0)
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"mcr P15, 0, R12, C9, C12, 0\n" // Write modified value back to PMCR
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:
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:
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: "r12", "cc" );
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SEGGER_SYSVIEW_Init(SEGGER_SYSVIEW_TIMESTAMP_FREQ, SEGGER_SYSVIEW_CPU_FREQ, &SYSVIEW_X_OS_TraceAPI, _cbSendSystemDesc);
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OS_TRACE_SetAPI(&embOS_TraceAPI_SYSVIEW); // Configure embOS to use SYSVIEW.
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#if SEGGER_SYSVIEW_START_ON_INIT
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SEGGER_SYSVIEW_Start(); // Start recording to catch system initialization.
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#endif
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}
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/*********************************************************************
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*
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* SEGGER_SYSVIEW_X_GetTimestamp()
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*
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* Function description
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* Returns the current timestamp in cycles using the system tick
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* count and the SysTick counter.
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* All parameters of the SysTick have to be known and are set via
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* configuration defines on top of the file.
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*
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* Return value
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* The current timestamp.
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*
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* Additional information
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* SEGGER_SYSVIEW_X_GetTimestamp is always called when interrupts are
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* disabled. Therefore locking here is not required.
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*/
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U32 SEGGER_SYSVIEW_X_GetTimestamp(void) {
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U32 Cycles;
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__asm volatile ("mrc P15, 0, %0, C9, C13, 0\n" // Read PMCCNTR (performance monitors cycle count register)
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: "=r" (Cycles)
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:
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: );
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return Cycles;
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}
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/*********************************************************************
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*
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* SEGGER_SYSVIEW_X_GetInterruptId()
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*/
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U32 SEGGER_SYSVIEW_X_GetInterruptId(void) {
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return SEGGER_SYSVIEW_InterruptId;
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}
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/*************************** End of file ****************************/
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