企业官网建设流程全解析

下载资源清单

第一个项目

导入项目

1. 点击下图Import Projects
   
2. 选定项目目录
3. 根据开发板修改Blink LED
   

配置

1. 打开项目properties
   
2. 配置SEGGER JLINK
3. 配置ARM HEX Utility
   
   3.1 General Options
   
   3.2 Output format Options
   

Build & Flash Project

代码解析

main.c

intmain(void){/* Prepare the hardware to run this demo. */prvSetupHardware();main_blinky();return0;}

• prvSetupHardware()：执行硬件相关初始化（在本文件中最终调用了 SYSCFG_DL_init()），准备外设/时钟等以供后续任务使用。
• main_blinky()：启动 blinky 示例程序，通常会在该函数中创建 FreeRTOS 任务并启动调度器（例如调用 vTaskStartScheduler），因此正常情况下该函数不会返回。

main_blinky.c

/* Kernel includes. */#include"FreeRTOS.h"#include"semphr.h"#include"task.h"/* TI includes. */#include"ti_msp_dl_config.h"/* Priorities at which the tasks are created. */#definemainQUEUE_RECEIVE_TASK_PRIORITY(tskIDLE_PRIORITY+2)#definemainQUEUE_SEND_TASK_PRIORITY(tskIDLE_PRIORITY+1)/* * The rate at which data is sent to the queue. The 1s (1000ms) value is * converted to ticks using the pdMS_TO_TICKS constant. */#definemainQUEUE_SEND_FREQUENCY_MS(pdMS_TO_TICKS(1000UL))/* * The number of items the queue can hold. This is 1 as the receive task * will remove items as they are added, meaning the send task should always * find the queue empty. */#definemainQUEUE_LENGTH(1)/* * Values passed to the two tasks just to check the task parameter * functionality. */#definemainQUEUE_SEND_PARAMETER(0x1111UL)#definemainQUEUE_RECEIVE_PARAMETER(0x22UL)/*-----------------------------------------------------------*//* The tasks as described in the comments at the top of this file. */staticvoidprvQueueReceiveTask(void*pvParameters);staticvoidprvQueueSendTask(void*pvParameters);/* Called by main() to create the simply blinky style application */voidmain_blinky(void);/*-----------------------------------------------------------*//* The queue used by both tasks. */staticQueueHandle_t xQueue=NULL;/*-----------------------------------------------------------*/voidmain_blinky(void){/* Create the queue. */xQueue=xQueueCreate(mainQUEUE_LENGTH,sizeof(uint32_t));if(xQueue!=NULL){/* * Start the two tasks as described in the comments at the top of this * file. */xTaskCreate(prvQueueReceiveTask,/* The function that implements the task. */"Rx",/* The text name assigned to the task - for debug only as it is not used by the kernel. */configMINIMAL_STACK_SIZE,/* The size of the stack to allocate to the task. */(void*)mainQUEUE_RECEIVE_PARAMETER,/* The parameter passed to the task - just to check the functionality. */mainQUEUE_RECEIVE_TASK_PRIORITY,/* The priority assigned to the task. */NULL);/* The task handle is not required, so NULL is passed. */xTaskCreate(prvQueueSendTask,"TX",configMINIMAL_STACK_SIZE,(void*)mainQUEUE_SEND_PARAMETER,mainQUEUE_SEND_TASK_PRIORITY,NULL);/* Start the tasks. */vTaskStartScheduler();}/* * If all is well, the scheduler will now be running, and the following * line will never be reached. If the following line does execute, then * there was insufficient FreeRTOS heap memory available for the idle * and/or timer tasks to be created. See the memory management section on * the FreeRTOS web site for more details. */for(;;);}/*-----------------------------------------------------------*/staticvoidprvQueueSendTask(void*pvParameters){TickType_t xNextWakeTime;constunsignedlongulValueToSend=100UL;/* Check the task parameter is as expected. */configASSERT(((unsignedlong)pvParameters)==mainQUEUE_SEND_PARAMETER);/* Initialize xNextWakeTime - this only needs to be done once. */xNextWakeTime=xTaskGetTickCount();for(;;){/* * Place this task in the blocked state until it is time to run again. * The block time is specified in ticks, the constant used converts * ticks to ms. While in the Blocked state this task will not consume * any CPU time. */vTaskDelayUntil(&xNextWakeTime,mainQUEUE_SEND_FREQUENCY_MS);/* * Send to the queue - causing the queue receive task to unblock and * toggle the LED. 0 is used as the block time so the sending operation * will not block - it shouldn't need to block as the queue should always * be empty at this point in the code. */xQueueSend(xQueue,&ulValueToSend,0U);}}/*-----------------------------------------------------------*/staticvoidprvQueueReceiveTask(void*pvParameters){unsignedlongulReceivedValue;staticconstTickType_t xShortBlock=pdMS_TO_TICKS(50);/* Check the task parameter is as expected. */configASSERT(((unsignedlong)pvParameters)==mainQUEUE_RECEIVE_PARAMETER);for(;;){/* * Wait until something arrives in the queue - this task will block * indefinitely provided INCLUDE_vTaskSuspend is set to 1 in * FreeRTOSConfig.h. */xQueueReceive(xQueue,&ulReceivedValue,portMAX_DELAY);/* * To get here something must have been received from the queue, but * is it the expected value? If it is, toggle the LED. */if(ulReceivedValue==100UL){/* * Blip the LED for a short while so as not to use too much * power. */DL_GPIO_togglePins(GPIO_LEDS_PORT,GPIO_LEDS_USER_LED_1_PIN);vTaskDelay(xShortBlock);DL_GPIO_togglePins(GPIO_LEDS_PORT,GPIO_LEDS_USER_LED_1_PIN);ulReceivedValue=0U;}}}

用任务与队列实现一个“1 秒闪烁一次 LED”的简单应用。程序创建一个长度为 1 的队列和两个任务：发送任务每秒向队列发送一个固定值，接收任务从队列读取值并在值匹配时短暂点亮（翻转）LED。

关键宏与全局

• mainQUEUE_SEND_FREQUENCY_MS：发送周期，pdMS_TO_TICKS(1000) → 1 秒。
• mainQUEUE_LENGTH：队列长度为 1。
• mainQUEUE_SEND_PARAMETER / mainQUEUE_RECEIVE_PARAMETER：传递给任务的参数，用于 configASSERT 校验。
• xQueue：静态声明的队列句柄（QueueHandle_t）。

main_blinky()（程序入口逻辑）

1. 调用 xQueueCreate 创建队列（项大小为 uint32_t）。
2. 若队列创建成功：

• 创建接收任务 prvQueueReceiveTask（优先级较高）。
• 创建发送任务 prvQueueSendTask（优先级较低）。
• 调用 vTaskStartScheduler 启动调度器（通常不会返回）。

3. 若调度器无法启动则进入无限空循环（表明堆内存不足以创建空闲或定时器任务）。

发送任务：prvQueueSendTask

• 使用 xTaskGetTickCount 和 vTaskDelayUntil 实现周期调度（节省漂移）。
• 每次唤醒后通过 xQueueSend 将常量 100UL 发送到队列（阻塞时间 0，期望队列为空）。

接收任务：prvQueueReceiveTask

• 使用 xQueueReceive(…, portMAX_DELAY) 永久阻塞等待队列数据。
• 收到数据后，如果值为 100UL，调用 DL_GPIO_togglePins 翻转用户 LED，引入短延时（vTaskDelay）以“眨一下”LED，然后再翻转回去。