本篇测评移植freeRTOS, 实现多任务操作,1秒打印“Hello 21ic, Hello MM32F0121"字符串,让LED闪烁.
要移植,先得去下载源码,可以直接去官网下载https://www.freertos.org/,我这里下载的是
下载完后就是移植文件,下面的文件中有很多其它类别的文件,这里只要复制核心文件就可以了
打开这个文件夹,复制里面的文件到示例工程中
复制完后,还需要一个FreeRTOSConfig.h,内容如下
#ifndef FREERTOS_CONFIG_H
#define FREERTOS_CONFIG_H
#define configUSE_PREEMPTION 1
#define configUSE_IDLE_HOOK 0
#define configUSE_TICK_HOOK 0
#define configCPU_CLOCK_HZ (72000000UL)
#define configTICK_RATE_HZ ((TickType_t)1000)
#define configMAX_PRIORITIES (5)
#define configMINIMAL_STACK_SIZE (64) // word, 64*4 = 256 bytes
#define configTOTAL_HEAP_SIZE ((size_t)(6*1024))
#define configMAX_TASK_NAME_LEN (10)
#define configUSE_TRACE_FACILITY 0
#define configUSE_16_BIT_TICKS 0
#define configIDLE_SHOULD_YIELD 1
#define configUSE_MUTEXES 1
#define configQUEUE_REGISTRY_SIZE 0
#define configCHECK_FOR_STACK_OVERFLOW 1
#define configUSE_RECURSIVE_MUTEXES 0
#define configUSE_MALLOC_FAILED_HOOK 1
#define configUSE_APPLICATION_TASK_TAG 0
#define configUSE_COUNTING_SEMAPHORES 0
/* Software timer definitions. */
#define configUSE_TIMERS 0
/* API function inclusion */
#define INCLUDE_vTaskPrioritySet 1
#define INCLUDE_uxTaskPriorityGet 1
#define INCLUDE_vTaskDelete 1
#define INCLUDE_vTaskCleanUpResources 0
#define INCLUDE_vTaskSuspend 1
#define INCLUDE_vTaskDelayUntil 1
#define INCLUDE_vTaskDelay 1
/* Cortex-M specific */
#define configPRIO_BITS 2 // Cortex-M0
#define configLIBRARY_LOWEST_INTERRUPT_PRIORITY 3
#define configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY 1
#define configKERNEL_INTERRUPT_PRIORITY ( configLIBRARY_LOWEST_INTERRUPT_PRIORITY << (8 - configPRIO_BITS) )
#define configMAX_SYSCALL_INTERRUPT_PRIORITY ( configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY << (8 - configPRIO_BITS) )
#define configASSERT(x) if ((x) == 0) { taskDISABLE_INTERRUPTS(); for(;;); }
/* Hook SysTick/PendSV/SVC */
#define xPortPendSVHandler PendSV_Handler
#define vPortSVCHandler SVC_Handler
#define xPortSysTickHandler SysTick_Handler
#endif
还去屏蔽原来自带的延时函数,和两个中断函数,
main.c内容
#include "platform.h"
#include "FreeRTOS.h"
#include "task.h"
extern void freeRTOS_Demo(void);
int main(void)
{
PLATFORM_Init(); // 初始化硬件,比如LED GPIO等
freeRTOS_Demo();
while (1);
}
新建一个freeRTOS_Demo.c,内容如下
#include "FreeRTOS.h"
#include "task.h"
#include "platform.h"
#include <stdio.h>
// 任务栈大小 (单位:word)
#define LED_TASK_STACK_SIZE 128
#define PRINT_TASK_STACK_SIZE 256
void vLED1Task(void *pvParameters) {
while(1) {
PLATFORM_LED_Toggle(LED1);
vTaskDelay(pdMS_TO_TICKS(100));
}
}
void vLED2Task(void *pvParameters) {
while(1) {
PLATFORM_LED_Toggle(LED2);
vTaskDelay(pdMS_TO_TICKS(500));
}
}
void vPrintTask(void *pvParameters) {
while(1) {
printf("Hello MM32F0121 FreeRTOS!\r\n");
vTaskDelay(pdMS_TO_TICKS(2000));
}
}
void vApplicationMallocFailedHook(void)
{
printf("Malloc failed!\r\n");
taskDISABLE_INTERRUPTS();
while(1);
}
void vApplicationStackOverflowHook(TaskHandle_t xTask, char *pcTaskName)
{
printf("Stack overflow in task: %s\r\n", pcTaskName);
taskDISABLE_INTERRUPTS();
while(1);
}
void freeRTOS_Demo(void)
{
xTaskCreate(vLED1Task, "LED1", LED_TASK_STACK_SIZE, NULL, 2, NULL);
xTaskCreate(vLED2Task, "LED2", LED_TASK_STACK_SIZE, NULL, 2, NULL);
xTaskCreate(vPrintTask, "Print", PRINT_TASK_STACK_SIZE, NULL, 3, NULL);
vTaskStartScheduler();
// 正常不会执行到此
printf("Scheduler failed to start.\r\n");
while(1);
}
接下来就是编译,正常是0错误,0警告,下载到开发板,效果如下
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