版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/wowocpp/article/details/81981704
运行在板子：NU_LB_NUC140上面：
运行之后的效果是LED5，LED6，LED7 会以不同的频率 闪烁。
LED5 闪烁最快，LED6 比它慢一倍，LED7 更慢一倍
UART0 ：PB0 PB1
LED PC12，PC13，PC14
main.c函数：
/******************************************************************************
* @file main.c
* @version V1.00
* $Revision: 1 $
* $Date: 14/12/08 11:51a $
* @brief Software Development Template.
*
* @note
* Copyright (C) 2014 Nuvoton Technology Corp. All rights reserved.
*****************************************************************************/
#include <stdio.h>
#include "NUC100Series.h"
#include "FreeRTOS.h"
#include "flash.h"
#include "task.h"
#include "timers.h"
#include "semphr.h"
#define mainFLASH_TASK_PRIORITY ( tskIDLE_PRIORITY + 1UL )
void vApplicationTickHook(void)
{
/* This function will be called by each tick interrupt if
configUSE_TICK_HOOK is set to 1 in FreeRTOSConfig.h. User code can be
added here, but the tick hook is called from an interrupt context, so
code must not attempt to block, and only the interrupt safe FreeRTOS API
functions can be used (those that end in FromISR()). */
}
void vApplicationIdleHook(void)
{
/* vApplicationIdleHook() will only be called if configUSE_IDLE_HOOK is set
to 1 in FreeRTOSConfig.h. It will be called on each iteration of the idle
task. It is essential that code added to this hook function never attempts
to block in any way (for example, call xQueueReceive() with a block time
specified, or call vTaskDelay()). If the application makes use of the
vTaskDelete() API function (as this demo application does) then it is also
important that vApplicationIdleHook() is permitted to return to its calling
function, because it is the responsibility of the idle task to clean up
memory allocated by the kernel to any task that has since been deleted. */
}
void vApplicationMallocFailedHook(void)
{
/* vApplicationMallocFailedHook() will only be called if
configUSE_MALLOC_FAILED_HOOK is set to 1 in FreeRTOSConfig.h. It is a hook
function that will get called if a call to pvPortMalloc() fails.
pvPortMalloc() is called internally by the kernel whenever a task, queue,
timer or semaphore is created. It is also called by various parts of the
demo application. If heap_1.c or heap_2.c are used, then the size of the
heap available to pvPortMalloc() is defined by configTOTAL_HEAP_SIZE in
FreeRTOSConfig.h, and the xPortGetFreeHeapSize() API function can be used
to query the size of free heap space that remains (although it does not
provide information on how the remaining heap might be fragmented). */
taskDISABLE_INTERRUPTS();
for(;;);
}
void SYS_Init(void)
{
/* Enable IP clock */
CLK->APBCLK = CLK_APBCLK_UART0_EN_Msk;
/* Update System Core Clock */
/* User can use SystemCoreClockUpdate() to calculate SystemCoreClock and cyclesPerUs automatically. */
SystemCoreClockUpdate();
/* Set GPB multi-function pins for UART0 RXD and TXD */
SYS->GPB_MFP = SYS_GPB_MFP_PB0_UART0_RXD | SYS_GPB_MFP_PB1_UART0_TXD;
}
int main()
{
int8_t ch;
/* Unlock protected registers */
SYS_UnlockReg();
SYS_Init();
/* Lock protected registers */
SYS_LockReg();
/* Init UART0 to 115200-8n1 for print message */
UART_Open(UART0, 115200);
printf("FreeRTOS Test \r\n");
vStartLEDFlashTasks(mainFLASH_TASK_PRIORITY);
vTaskStartScheduler();
while(1);
}
/*** (C) COPYRIGHT 2014 Nuvoton Technology Corp. ***/
flash.c内容：
/*
FreeRTOS V8.2.3 - Copyright (C) 2015 Real Time Engineers Ltd.
All rights reserved
VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
This file is part of the FreeRTOS distribution.
FreeRTOS is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License (version 2) as published by the
Free Software Foundation >>>> AND MODIFIED BY <<<< the FreeRTOS exception.
***************************************************************************
>>! NOTE: The modification to the GPL is included to allow you to !<<
>>! distribute a combined work that includes FreeRTOS without being !<<
>>! obliged to provide the source code for proprietary components !<<
>>! outside of the FreeRTOS kernel. !<<
***************************************************************************
FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. Full license text is available on the following
link: http://www.freertos.org/a00114.html
***************************************************************************
* *
* FreeRTOS provides completely free yet professionally developed, *
* robust, strictly quality controlled, supported, and cross *
* platform software that is more than just the market leader, it *
* is the industry's de facto standard. *
* *
* Help yourself get started quickly while simultaneously helping *
* to support the FreeRTOS project by purchasing a FreeRTOS *
* tutorial book, reference manual, or both: *
* http://www.FreeRTOS.org/Documentation *
* *
***************************************************************************
http://www.FreeRTOS.org/FAQHelp.html - Having a problem? Start by reading
the FAQ page "My application does not run, what could be wrong?". Have you
defined configASSERT()?
http://www.FreeRTOS.org/support - In return for receiving this top quality
embedded software for free we request you assist our global community by
participating in the support forum.
http://www.FreeRTOS.org/training - Investing in training allows your team to
be as productive as possible as early as possible. Now you can receive
FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers
Ltd, and the world's leading authority on the world's leading RTOS.
http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
including FreeRTOS+Trace - an indispensable productivity tool, a DOS
compatible FAT file system, and our tiny thread aware UDP/IP stack.
http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.
http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High
Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS
licenses offer ticketed support, indemnification and commercial middleware.
http://www.SafeRTOS.com - High Integrity Systems also provide a safety
engineered and independently SIL3 certified version for use in safety and
mission critical applications that require provable dependability.
1 tab == 4 spaces!
*/
/**
* This version of flash .c is for use on systems that have limited stack space
* and no display facilities. The complete version can be found in the
* Demo/Common/Full directory.
*
* Three tasks are created, each of which flash an LED at a different rate. The first
* LED flashes every 200ms, the second every 400ms, the third every 600ms.
*
* The LED flash tasks provide instant visual feedback. They show that the scheduler
* is still operational.
*
*/
#include <stdlib.h>
#include <stdio.h>
/* Scheduler include files. */
#include "FreeRTOS.h"
#include "task.h"
#include "flash.h"
/* Only the one LED are used. */
#define partstMAX_LEDS 3
#define partstFIRST_LED (1<<12) // PC.12
static unsigned portSHORT usOutputValue = 0;
/*-----------------------------------------------------------*/
void vParTestToggleLED(unsigned long ulLED)
{
unsigned portSHORT usBit;
if(ulLED < partstMAX_LEDS)
{
taskENTER_CRITICAL();
{
usBit = partstFIRST_LED << ulLED;
if(usOutputValue & usBit)
{
usOutputValue &= ~usBit;
//printf("PC.12 Output Lo\n");
}
else
{
usOutputValue |= usBit;
//printf("PC.12 Output Hi\n");
}
PC->DOUT = usOutputValue;
}
taskEXIT_CRITICAL();
}
}
#define ledSTACK_SIZE configMINIMAL_STACK_SIZE
#define ledNUMBER_OF_LEDS ( 3 )
#define ledFLASH_RATE_BASE ( ( TickType_t ) 666 )
/* Variable used by the created tasks to calculate the LED number to use, and
the rate at which they should flash the LED. */
static volatile UBaseType_t uxFlashTaskNumber = 0;
/* The task that is created three times. */
static portTASK_FUNCTION_PROTO( vLEDFlashTask, pvParameters );
/*-----------------------------------------------------------*/
void vStartLEDFlashTasks( UBaseType_t uxPriority )
{
BaseType_t xLEDTask;
/* Create the three tasks. */
for( xLEDTask = 0; xLEDTask < ledNUMBER_OF_LEDS; ++xLEDTask )
{
/* Spawn the task. */
xTaskCreate( vLEDFlashTask, "LEDx", ledSTACK_SIZE, NULL, uxPriority, ( TaskHandle_t * ) NULL );
}
}
/*-----------------------------------------------------------*/
static portTASK_FUNCTION( vLEDFlashTask, pvParameters )
{
TickType_t xFlashRate, xLastFlashTime;
UBaseType_t uxLED;
/* The parameters are not used. */
( void ) pvParameters;
/* Calculate the LED and flash rate. */
portENTER_CRITICAL();
{
/* See which of the eight LED's we should use. */
uxLED = uxFlashTaskNumber;
/* Update so the next task uses the next LED. */
uxFlashTaskNumber++;
}
portEXIT_CRITICAL();
xFlashRate = ledFLASH_RATE_BASE + ( ledFLASH_RATE_BASE * ( TickType_t ) uxLED );
xFlashRate /= portTICK_PERIOD_MS;
/* We will turn the LED on and off again in the delay period, so each
delay is only half the total period. */
xFlashRate /= ( TickType_t ) 2;
/* We need to initialise xLastFlashTime prior to the first call to
vTaskDelayUntil(). */
xLastFlashTime = xTaskGetTickCount();
for(;;)
{
/* Delay for half the flash period then turn the LED on. */
vTaskDelayUntil( &xLastFlashTime, xFlashRate );
vParTestToggleLED( uxLED );
/* Delay for half the flash period then turn the LED off. */
vTaskDelayUntil( &xLastFlashTime, xFlashRate );
vParTestToggleLED( uxLED );
}
} /*lint !e715 !e818 !e830 Function definition must be standard for task creation. */