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/*
* FreeRTOS Kernel V10.4.1
* Copyright (C) 2020 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.
*
* 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!
*/
/* FreeRTOS includes. */
#include "FreeRTOS.h"
/* Renesas includes. */
#include "r_cg_macrodriver.h"
#include "r_cg_cmt.h"
#include "r_reset.h"
/*-----------------------------------------------------------*/
/*
* Entry point for the FreeRTOS tick interrupt. This sets the pxISRFunction
* variable to point to the RTOS tick handler, then branches to the FreeRTOS
* IRQ handler.
*/
#ifdef __GNUC__
static void FreeRTOS_Tick_Handler_Entry( void ) __attribute__((naked));
#endif /* __GNUC__ */
#ifdef __ICCARM__
/* IAR requires the entry point to be in an assembly file. The function is
implemented in $PROJ_DIR$/System/IAR/Interrupt_Entry_Stubs.asm. */
extern void FreeRTOS_Tick_Handler_Entry( void );
#endif /* __ICCARM__ */
/*
* The FreeRTOS IRQ handler, which is implemented in the RTOS port layer.
*/
extern void FreeRTOS_IRQ_Handler( void );
/*
* The function called by the FreeRTOS_IRQ_Handler() to call the actual
* peripheral handler.
*/
void vApplicationIRQHandler( void );
/*-----------------------------------------------------------*/
/*
* Variable used to hold the address of the interrupt handler the FreeRTOS IRQ
* handler will branch to.
*/
ISRFunction_t pxISRFunction = NULL;
/*-----------------------------------------------------------*/
/*
* The application must provide a function that configures a peripheral to
* create the FreeRTOS tick interrupt, then define configSETUP_TICK_INTERRUPT()
* in FreeRTOSConfig.h to call the function.
*/
void vConfigureTickInterrupt( void )
{
uint32_t ulCompareMatchValue;
const uint32_t ulPeripheralClockDivider = 6UL, ulCMTClockDivider = 8UL;
/* Disable CMI5 interrupt. */
VIC.IEC9.LONG = 0x00001000UL;
/* Cancel CMT stop state in LPC. */
r_rst_write_enable();
MSTP( CMT2 ) = 0U;
r_rst_write_disable();
/* Interrupt on compare match. */
CMT5.CMCR.BIT.CMIE = 1;
/* Calculate the compare match value. */
ulCompareMatchValue = configCPU_CLOCK_HZ / ulPeripheralClockDivider;
ulCompareMatchValue /= ulCMTClockDivider;
ulCompareMatchValue /= configTICK_RATE_HZ;
ulCompareMatchValue -= 1UL;
/* Set the compare match value. */
CMT5.CMCOR = ( unsigned short ) ulCompareMatchValue;
/* Divide the PCLK by 8. */
CMT5.CMCR.BIT.CKS = 0;
CMT5.CMCNT = 0;
/* Set CMI5 edge detection type. */
VIC.PLS9.LONG |= 0x00001000UL;
/* Set CMI5 priority level to the lowest possible. */
VIC.PRL300.LONG = _CMT_PRIORITY_LEVEL31;
/* Set CMI5 interrupt address */
VIC.VAD300.LONG = ( uint32_t ) FreeRTOS_Tick_Handler_Entry;
/* Enable CMI5 interrupt in ICU. */
VIC.IEN9.LONG |= 0x00001000UL;
/* Start CMT5 count. */
CMT.CMSTR2.BIT.STR5 = 1U;
}
/*-----------------------------------------------------------*/
/*
* The function called by the FreeRTOS IRQ handler, after it has managed
* interrupt entry. This function creates a local copy of pxISRFunction before
* re-enabling interrupts and actually calling the handler pointed to by
* pxISRFunction.
*/
void vApplicationIRQHandler( void )
{
ISRFunction_t pxISRToCall = pxISRFunction;
portENABLE_INTERRUPTS();
/* Call the installed ISR. */
pxISRToCall();
}
/*-----------------------------------------------------------*/
/*
* The RZ/T vectors directly to a peripheral specific interrupt handler, rather
* than using the Cortex-R IRQ vector. Therefore each interrupt handler
* installed by the application must follow the example below, which saves a
* pointer to a standard C function in the pxISRFunction variable, before
* branching to the FreeRTOS IRQ handler. The FreeRTOS IRQ handler then manages
* interrupt entry (including interrupt nesting), before calling the C function
* saved in the pxISRFunction variable. NOTE: This entry point is a naked
* function - do not add C code to this function.
*/
#ifdef __GNUC__
/* The IAR equivalent is implemented in
$PROJ_DIR$/System/IAR/Interrupt_Entry_Stubs.asm */
static void FreeRTOS_Tick_Handler_Entry( void )
{
__asm volatile (
"PUSH {r0-r1} \t\n"
"LDR r0, =pxISRFunction \t\n"
"LDR R1, =FreeRTOS_Tick_Handler \t\n"
"STR R1, [r0] \t\n"
"POP {r0-r1} \t\n"
"B FreeRTOS_IRQ_Handler "
);
}
#endif /* __GNUC__ */
/*-----------------------------------------------------------*/
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