/* | |
* FreeRTOS Kernel V10.0.0 | |
* Copyright (C) 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved. | |
* | |
* Permission is hereby granted, free of charge, to any person obtaining a copy of | |
* this software and associated documentation files (the "Software"), to deal in | |
* the Software without restriction, including without limitation the rights to | |
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of | |
* the Software, and to permit persons to whom the Software is furnished to do so, | |
* subject to the following conditions: | |
* | |
* The above copyright notice and this permission notice shall be included in all | |
* copies or substantial portions of the Software. If you wish to use our Amazon | |
* FreeRTOS name, please do so in a fair use way that does not cause confusion. | |
* | |
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS | |
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR | |
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER | |
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | |
* | |
* http://www.FreeRTOS.org | |
* http://aws.amazon.com/freertos | |
* | |
* 1 tab == 4 spaces! | |
*/ | |
/* High speed timer test as described in main.c. */ | |
/* System port includes */ | |
#include "appcfg.h" | |
#include "platform.h" | |
#include "MEC14xx/mec14xx.h" | |
#include "MEC14xx/mec14xx_girqs.h" | |
/* Scheduler includes. */ | |
#include "FreeRTOS.h" | |
/* The priority of the high speed timer interrupt. */ | |
#define timerTEST_INT_PRIORITY ( 7 ) | |
/* MEC14xx Timer 3 Timer MMCR's */ | |
#define portMMCR_TMR3_COUNT *((volatile uint32_t *)(0xA0000C60ul)) | |
#define portMMCR_TMR3_PRELOAD *((volatile uint32_t *)(0xA0000C64ul)) | |
#define portMMCR_TMR3_STATUS *((volatile uint32_t *)(0xA0000C68ul)) | |
#define portMMCR_TMR3_INTEN *((volatile uint32_t *)(0xA0000C6Cul)) | |
#define portMMCR_TMR3_CONTROL *((volatile uint32_t *)(0xA0000C70ul)) | |
/* MEC14xx JTVIC external interrupt controller | |
* is mapped to M14K closely-coupled peripheral space. | |
*/ | |
#define portGIRQ23_TMR3_TIMER_BITPOS (3) | |
#define portGIRQ23_TMR3_TIMER_MASK (1ul << (portGIRQ23_TMR3_TIMER_BITPOS)) | |
#define portMMCR_JTVIC_GIRQ23_SRC *((volatile uint32_t *)(0xBFFFC0F0ul)) | |
#define portMMCR_JTVIC_GIRQ23_SETEN *((volatile uint32_t *)(0xBFFFC0F4ul)) | |
#define portMMCR_JTVIC_GIRQ23_PRIA *((volatile uint32_t *)(0xBFFFC3F0ul)) | |
/*-----------------------------------------------------------*/ | |
/* Incremented every 20,000 interrupts, so should count in seconds. */ | |
unsigned long ulHighFrequencyTimerInterrupts = 0; | |
/*-----------------------------------------------------------*/ | |
void vSetupTimerTest( unsigned short usFrequencyHz ) | |
{ | |
/* Timer 3 is going to interrupt at usFrequencyHz Hz. */ | |
const uint32_t ulPreload = ( unsigned short ) ( ( configPERIPHERAL_CLOCK_HZ / ( unsigned long ) usFrequencyHz ) - 1 ); | |
/* Timer 3 is used to generate interrupts above the kernel and max syscall | |
interrupt priorities. No system library calls are used here as they are not | |
guaranteed to be re-entrant. */ | |
portMMCR_TMR3_CONTROL = 1ul; | |
portMMCR_TMR3_PRELOAD = ulPreload; | |
portMMCR_TMR3_COUNT = ulPreload; | |
portMMCR_TMR3_INTEN = 0x0001ul; | |
portMMCR_TMR3_STATUS = 0x0001ul; | |
/* Enable Timer 3, and set for auto restart, counting down. */ | |
portMMCR_TMR3_CONTROL |= 0x0008; | |
portMMCR_TMR3_CONTROL |= 0x0020; | |
/* Configure interrupts from the Timer 3. */ | |
portMMCR_JTVIC_GIRQ23_SRC = ( portGIRQ23_TMR3_TIMER_MASK ); | |
portMMCR_JTVIC_GIRQ23_PRIA &= ~( 0x0Ful << 12 ); | |
portMMCR_JTVIC_GIRQ23_PRIA |= ( ( portIPL_TO_CODE( timerTEST_INT_PRIORITY ) ) << 12 ); | |
portMMCR_JTVIC_GIRQ23_SETEN = ( portGIRQ23_TMR3_TIMER_MASK ); | |
} | |
/*-----------------------------------------------------------*/ | |
/* Interrupt handler for Timer 3 interrupts, no library functions are used | |
here as they may not be re-entrant. */ | |
void __attribute__((interrupt, nomips16)) girq23_b3( void ) | |
{ | |
ulHighFrequencyTimerInterrupts++; | |
/* The interrupt flag registered is shared with the lower priority timer | |
interrupts and the RTOS timer so disable interrupts here. This is not | |
strictly necessary since this is the highest priority interrupt. */ | |
__asm volatile( "di" ); | |
/* Clear the timer interrupt. */ | |
portMMCR_JTVIC_GIRQ23_SRC = portGIRQ23_TMR3_TIMER_MASK; | |
__asm volatile( "ei" ); | |
} | |