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Starting point for IAR RISC-V project created some time ago - checking in now so it can be completed - currently work in progress.
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Richard Barry
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FreeRTOS/Demo/RISC-V_RV32_SiFive_IAR/main.c
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FreeRTOS/Demo/RISC-V_RV32_SiFive_IAR/main.c
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/*
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* FreeRTOS Kernel V10.2.1
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* Copyright (C) 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* http://www.FreeRTOS.org
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* http://aws.amazon.com/freertos
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*
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* 1 tab == 4 spaces!
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*/
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/* FreeRTOS kernel includes. */
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#include <FreeRTOS.h>
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#include <task.h>
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/******************************************************************************
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* This project provides two demo applications. A simple blinky style project,
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* and a more comprehensive test and demo application. The
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* mainCREATE_SIMPLE_BLINKY_DEMO_ONLY setting (defined in this file) is used to
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* select between the two. The simply blinky demo is implemented and described
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* in main_blinky.c. The more comprehensive test and demo application is
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* implemented and described in main_full.c.
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*
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* This file implements the code that is not demo specific, including the
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* hardware setup and standard FreeRTOS hook functions.
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*
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* ENSURE TO READ THE DOCUMENTATION PAGE FOR THIS PORT AND DEMO APPLICATION ON
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* THE http://www.FreeRTOS.org WEB SITE FOR FULL INFORMATION ON USING THIS DEMO
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* APPLICATION, AND ITS ASSOCIATE FreeRTOS ARCHITECTURE PORT!
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*
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*/
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/* UART hardware constants. */
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#define mainUART_BASE_ADDRESS ( *( volatile uint32_t * ) 0x20000000UL )
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#define mainUART_TX_DATA 0x00
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#define mainUART_TX_CTRL 0x08
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#define mainUART_RX_CTRL 0x0c
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#define mainUART_CLOCK_DIV 0x18
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#define mainUART_TX_ENABLE_BIT (1UL << 0UL)
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#define mainUART_RX_ENABLE_BIT (1UL << 0UL)
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#define mainUART_TX_FULL_BIT (1UL << 31UL)
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#define mainUART_REGISTER( offset ) ( ( mainUART_BASE_ADDRESS + offset ) )
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#define mainUART_REGISTER_WORD( offset ) ( *( ( uint32_t * ) mainUART_REGISTER( offset ) ) )
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/* Set mainCREATE_SIMPLE_BLINKY_DEMO_ONLY to one to run the simple blinky demo,
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or 0 to run the more comprehensive test and demo application. */
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#define mainCREATE_SIMPLE_BLINKY_DEMO_ONLY 0
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/*
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* main_blinky() is used when mainCREATE_SIMPLE_BLINKY_DEMO_ONLY is set to 1.
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* main_full() is used when mainCREATE_SIMPLE_BLINKY_DEMO_ONLY is set to 0.
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*/
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#if mainCREATE_SIMPLE_BLINKY_DEMO_ONLY == 1
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extern void main_blinky( void );
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#else
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extern void main_full( void );
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#endif /* #if mainCREATE_SIMPLE_BLINKY_DEMO_ONLY == 1 */
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/* Prototypes for the standard FreeRTOS callback/hook functions implemented
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within this file. See https://www.freertos.org/a00016.html */
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void vApplicationMallocFailedHook( void );
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void vApplicationIdleHook( void );
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void vApplicationStackOverflowHook( TaskHandle_t pxTask, char *pcTaskName );
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void vApplicationTickHook( void );
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/* Prepare hardware to run the demo. */
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static void prvSetupHardware( void );
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/* Send a message to the UART initialised in prvSetupHardware. */
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void vSendString( const char * const pcString );
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/*-----------------------------------------------------------*/
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int main( void )
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{
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prvSetupHardware();
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/* The mainCREATE_SIMPLE_BLINKY_DEMO_ONLY setting is described at the top
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of this file. */
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#if( mainCREATE_SIMPLE_BLINKY_DEMO_ONLY == 1 )
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{
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main_blinky();
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}
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#else
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{
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main_full();
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}
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#endif
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}
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/*-----------------------------------------------------------*/
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static void prvSetupHardware( void )
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{
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const unsigned long clock_rate = 66000000, baud_rate = 115200;
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/* Initialise the UART. */
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mainUART_REGISTER_WORD( mainUART_CLOCK_DIV ) = clock_rate / baud_rate - 1;
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mainUART_REGISTER_WORD( mainUART_TX_CTRL ) |= mainUART_TX_ENABLE_BIT;
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mainUART_REGISTER_WORD( mainUART_RX_CTRL ) |= mainUART_RX_ENABLE_BIT;
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}
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/*-----------------------------------------------------------*/
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void vToggleLED( void )
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{
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static uint32_t ulLEDState = 0;
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ulLEDState = !ulLEDState;
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}
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/*-----------------------------------------------------------*/
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void vSendString( const char * const pcString )
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{
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uint32_t ulIndex = 0;
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while( pcString[ ulIndex ] != 0x00 )
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{
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while( ( mainUART_REGISTER_WORD( mainUART_TX_DATA ) & mainUART_TX_FULL_BIT ) != 0UL );
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mainUART_REGISTER_WORD(mainUART_TX_DATA) = pcString[ ulIndex ];
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ulIndex++;
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}
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}
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/*-----------------------------------------------------------*/
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void vApplicationMallocFailedHook( void )
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{
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/* vApplicationMallocFailedHook() will only be called if
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configUSE_MALLOC_FAILED_HOOK is set to 1 in FreeRTOSConfig.h. It is a hook
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function that will get called if a call to pvPortMalloc() fails.
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pvPortMalloc() is called internally by the kernel whenever a task, queue,
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timer or semaphore is created. It is also called by various parts of the
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demo application. If heap_1.c or heap_2.c are used, then the size of the
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heap available to pvPortMalloc() is defined by configTOTAL_HEAP_SIZE in
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FreeRTOSConfig.h, and the xPortGetFreeHeapSize() API function can be used
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to query the size of free heap space that remains (although it does not
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provide information on how the remaining heap might be fragmented). */
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taskDISABLE_INTERRUPTS();
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__asm volatile( "ebreak" );
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for( ;; );
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}
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/*-----------------------------------------------------------*/
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void vApplicationIdleHook( void )
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{
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/* vApplicationIdleHook() will only be called if configUSE_IDLE_HOOK is set
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to 1 in FreeRTOSConfig.h. It will be called on each iteration of the idle
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task. It is essential that code added to this hook function never attempts
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to block in any way (for example, call xQueueReceive() with a block time
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specified, or call vTaskDelay()). If the application makes use of the
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vTaskDelete() API function (as this demo application does) then it is also
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important that vApplicationIdleHook() is permitted to return to its calling
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function, because it is the responsibility of the idle task to clean up
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memory allocated by the kernel to any task that has since been deleted. */
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}
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/*-----------------------------------------------------------*/
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void vApplicationStackOverflowHook( TaskHandle_t pxTask, char *pcTaskName )
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{
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( void ) pcTaskName;
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( void ) pxTask;
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/* Run time stack overflow checking is performed if
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configCHECK_FOR_STACK_OVERFLOW is defined to 1 or 2. This hook
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function is called if a stack overflow is detected. */
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taskDISABLE_INTERRUPTS();
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__asm volatile( "ebreak" );
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for( ;; );
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}
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/*-----------------------------------------------------------*/
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void vApplicationTickHook( void )
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{
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/* The tests in the full demo expect some interaction with interrupts. */
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#if( mainCREATE_SIMPLE_BLINKY_DEMO_ONLY != 1 )
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{
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extern void vFullDemoTickHook( void );
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vFullDemoTickHook();
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}
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#endif
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}
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/*-----------------------------------------------------------*/
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/* Called from the kernel's port layer to handle device specific external
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interrupts. */
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void vApplicationHandleTrap( uint32_t mcause )
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{
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/* Not implemented yet. */
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configASSERT( mcause == 0 );
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#warning vApplicationHandleTrap not implemented.
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#if 0
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uint32_t ulInterruptNumber;
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typedef void ( * irq_handler_t )( void );
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extern const irq_handler_t isrTable[];
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ulInterruptNumber = PLIC->TARGET[ 0 ].CLAIM_COMPLETE;
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/* Read handler from table. */
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/* Call handler. */
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PLIC->TARGET[ 0 ].CLAIM_COMPLETE = ulInterruptNumber;
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#endif
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}
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