FreeRtos STM32工程代码带部分中文注释 -

/* Standard includes. */
#include <stdio.h>
/* Scheduler includes. */
#include "FreeRTOS.h"
#include "task.h"
#include "queue.h"
/* Library includes. */
#include "stm32f10x_it.h"
/* Demo app includes. */
#include "lcd.h"
#include "LCD_Message.h"
#include "BlockQ.h"
#include "death.h"
#include "integer.h"
#include "blocktim.h"
#include "partest.h"
#include "semtest.h"
#include "PollQ.h"
#include "flash.h"
#include "comtest2.h"
/* Task priorities. */
#define mainQUEUE_POLL_PRIORITY ( tskIDLE_PRIORITY + 2 )
#define mainCHECK_TASK_PRIORITY ( tskIDLE_PRIORITY + 3 )
#define mainSEM_TEST_PRIORITY ( tskIDLE_PRIORITY + 1 )
#define mainBLOCK_Q_PRIORITY ( tskIDLE_PRIORITY + 2 )
#define mainCREATOR_TASK_PRIORITY ( tskIDLE_PRIORITY + 3 )
#define mainFLASH_TASK_PRIORITY ( tskIDLE_PRIORITY + 1 )
#define mainCOM_TEST_PRIORITY ( tskIDLE_PRIORITY + 1 )
#define mainINTEGER_TASK_PRIORITY ( tskIDLE_PRIORITY )
/* Constants related to the LCD. */
#define mainMAX_LINE ( 240 )
#define mainROW_INCREMENT ( 24 )
#define mainMAX_COLUMN ( 20 )
#define mainCOLUMN_START ( 319 )
#define mainCOLUMN_INCREMENT ( 16 )
/* The maximum number of message that can be waiting for display at any one
time. */
#define mainLCD_QUEUE_SIZE ( 3 )
/* The check task uses the sprintf function so requires a little more stack. */
#define mainCHECK_TASK_STACK_SIZE ( configMINIMAL_STACK_SIZE + 50 )
/* Dimensions the buffer into which the jitter time is written. */
#define mainMAX_MSG_LEN 25
/* The time between cycles of the 'check' task. */
#define mainCHECK_DELAY ( ( TickType_t ) 5000 / portTICK_PERIOD_MS )
/* The number of nano seconds between each processor clock. */
#define mainNS_PER_CLOCK ( ( unsigned long ) ( ( 1.0 / ( double ) configCPU_CLOCK_HZ ) * 1000000000.0 ) )
/* Baud rate used by the comtest tasks. */
#define mainCOM_TEST_BAUD_RATE ( 115200 )
/* The LED used by the comtest tasks. See the comtest.c file for more
information. */
#define mainCOM_TEST_LED ( 3 )
/*-----------------------------------------------------------*/
/*
* Configure the clocks, GPIO and other peripherals as required by the demo.
*/
static void prvSetupHardware( void );
/*
* Configure the LCD as required by the demo.
*/
static void prvConfigureLCD( void );
/*
* The LCD is written two by more than one task so is controlled by a
* 'gatekeeper' task. This is the only task that is actually permitted to
* access the LCD directly. Other tasks wanting to display a message send
* the message to the gatekeeper.
*/
static void vLCDTask( void *pvParameters );
/*
* Retargets the C library printf function to the USART.
*/
int fputc( int ch, FILE *f );
/*
* Checks the status of all the demo tasks then prints a message to the
* display. The message will be either PASS - and include in brackets the
* maximum measured jitter time (as described at the to of the file), or a
* message that describes which of the standard demo tasks an error has been
* discovered in.
*
* Messages are not written directly to the terminal, but passed to vLCDTask
* via a queue.
*/
static void vCheckTask( void *pvParameters );
/*
* Configures the timers and interrupts for the fast interrupt test as
* described at the top of this file.
*/
extern void vSetupTimerTest( void );
/*-----------------------------------------------------------*/
/* The queue used to send messages to the LCD task. */
QueueHandle_t xLCDQueue;
/*-----------------------------------------------------------*/
int main( void )
{
#ifdef DEBUG
debug();
#endif
prvSetupHardware();
/* Create the queue used by the LCD task. Messages for display on the LCD
are received via this queue. */
xLCDQueue = xQueueCreate( mainLCD_QUEUE_SIZE, sizeof( xLCDMessage ) ); //创建LCD列队，并返回列队编号
/* Start the standard demo tasks. */
vStartBlockingQueueTasks( mainBLOCK_Q_PRIORITY ); //创建了6个任务，处理三组参数
vCreateBlockTimeTasks(); //创建两个block任务阻塞任务
vStartSemaphoreTasks( mainSEM_TEST_PRIORITY ); //
vStartPolledQueueTasks( mainQUEUE_POLL_PRIORITY ); //创建列队测试任务待挖掘
vStartIntegerMathTasks( mainINTEGER_TASK_PRIORITY ); //
vStartLEDFlashTasks( mainFLASH_TASK_PRIORITY ); //创建LED翻转任务，创建了3个相同的任务，每个对应不同的灯
vAltStartComTestTasks( mainCOM_TEST_PRIORITY, mainCOM_TEST_BAUD_RATE, mainCOM_TEST_LED ); //创建串口收发任务，收和发是两个任务
/* Start the tasks defined within this file/specific to this demo. */
xTaskCreate( vCheckTask, "Check", mainCHECK_TASK_STACK_SIZE, NULL, mainCHECK_TASK_PRIORITY, NULL ); //创建LCD内容显示设置任务
xTaskCreate( vLCDTask, "LCD", configMINIMAL_STACK_SIZE, NULL, tskIDLE_PRIORITY, NULL ); //创建LCD显示任务
/* The suicide tasks must be created last as they need to know how many
tasks were running prior to their creation in order to ascertain whether
or not the correct/expected number of tasks are running at any given time. */
vCreateSuicidalTasks( mainCREATOR_TASK_PRIORITY ); //创建一批可以自动删除的任务
/* Configure the timers used by the fast interrupt timer test. */
vSetupTimerTest(); //初始化定时器
/* Start the scheduler. */
vTaskStartScheduler(); //启动调度器，开始操作系统
/* Will only get here if there was not enough heap space to create the
idle task. */
return 0;
}
/*-----------------------------------------------------------*/
void vLCDTask( void *pvParameters )
{
xLCDMessage xMessage;
/* Initialise the LCD and display a startup message. */
prvConfigureLCD();
LCD_DrawMonoPict( ( unsigned long * ) pcBitmap );
for( ;; )
{
/* Wait for a message to arrive that requires displaying. */
while( xQueueReceive( xLCDQueue, &xMessage, portMAX_DELAY ) != pdPASS ); //从序列中读取数据，返回有没有
/* Display the message. Print each message to a different position. */
printf( ( char const * ) xMessage.pcMessage );
}
}
/*-----------------------------------------------------------*/
static void vCheckTask( void *pvParameters )
{
TickType_t xLastExecutionTime;
xLCDMessage xMessage;
static signed char cPassMessage[ mainMAX_MSG_LEN ];
extern unsigned short usMaxJitter;
xLastExecutionTime = xTaskGetTickCount();
xMessage.pcMessage = cPassMessage;
for( ;; )
{
/* Perform this check every mainCHECK_DELAY milliseconds. */
vTaskDelayUntil( &xLastExecutionTime, mainCHECK_DELAY ); //绝对延时，如果某个延时被任务耽搁了，会在下一次调用时补偿回来
/* Has an error been found in any task? */
if( xAreBlockingQueuesStillRunning() != pdTRUE )
{
xMessage.pcMessage = "ERROR IN BLOCK Q\n";
}
else if( xAreBlockTimeTestTasksStillRunning() != pdTRUE )
{
xMessage.pcMessage = "ERROR IN BLOCK TIME\n";
}
else if( xAreSemaphoreTasksStillRunning() != pdTRUE )
{
xMessage.pcMessage = "ERROR IN SEMAPHORE\n";
}
else if( xArePollingQueuesStillRunning() != pdTRUE )
{
xMessage.pcMessage = "ERROR IN POLL Q\n";
}
else if( xIsCreateTaskStillRunning() != pdTRUE )
{
xMessage.pcMessage = "ERROR IN CREATE\n";
}
else if( xAreIntegerMathsTaskStillRunning() != pdTRUE )
{
xMessage.pcMessage = "ERROR IN MATH\n";
}
else if( xAreComTestTasksStillRunning() != pdTRUE )
{
xMessage.pcMessage = "ERROR IN COM TEST\n";
}
else
{
sprintf( ( char * ) cPassMessage, "PASS [%uns]\n", ( ( unsigned long ) usMaxJitter ) * mainNS_PER_CLOCK );
}
/* Send the message to the LCD gatekeeper for display. */
xQueueSend( xLCDQueue, &xMessage, portMAX_DELAY );
}
}
/*-----------------------------------------------------------*/
static void prvSetupHardware( void )
{
/* Start with the clocks in their expected state. */
RCC_DeInit();
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