Use of Queue for sending multiple messages
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Check RTOS Basics : Queue tutorial for API details.
Code
Also check this example on Use of Queue for sending multiple messages
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/*************************************************************************************************** | |
ExploreEmbedded | |
**************************************************************************************************** | |
* File: main.c (FreeRTOS) | |
* Version: 15.0 | |
* Author: ExploreEmbedded | |
* Website: http://www.exploreembedded.com/wiki | |
* Description: Program to demonstrate the usage of queue to send and receive | |
multiple messages(strings) between two tasks. | |
The libraries have been tested on ExploreEmbedded development boards. We strongly believe that the | |
library works on any of development boards for respective controllers. However, ExploreEmbedded | |
disclaims any kind of hardware failure resulting out of usage of libraries, directly or indirectly. | |
Files may be subject to change without prior notice. The revision history contains the information | |
related to updates. | |
GNU GENERAL PUBLIC LICENSE: | |
This program is free software: you can redistribute it and/or modify | |
it under the terms of the GNU General Public License as published by | |
the Free Software Foundation, either version 3 of the License, or | |
(at your option) any later version. | |
This program 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. See the | |
GNU General Public License for more details. | |
You should have received a copy of the GNU General Public License | |
along with this program. If not, see <http://www.gnu.org/licenses/>. | |
Errors and omissions should be reported to codelibraries@exploreembedded.com | |
**************************************************************************************************/ | |
/* Scheduler include files. */ | |
#include "FreeRtOSConfig.h" | |
#include "FreeRTOS.h" | |
#include "task.h" | |
#include "croutine.h" | |
#include "queue.h" | |
#include "uart.h" // Explore Embedded UART library | |
#define MaxQueueSize 3 | |
#define MaxElementsPerQueue 20 | |
/* Local Task Declaration */ | |
static void MyTask1(void* pvParameters); | |
static void MyTask2(void* pvParameters); | |
xTaskHandle TaskHandle_1; | |
xTaskHandle TaskHandle_2; | |
xQueueHandle MyQueueHandleId; | |
#define LED_Task1 0x02u | |
#define LED_Task2 0x04u | |
#define LED_PORT LPC_GPIO2->FIOPIN | |
int main(void) | |
{ | |
SystemInit(); /* Initialize the controller */ | |
UART_Init(38400); /* Initialize the Uart module */ | |
LPC_GPIO2->FIODIR = 0xffffffffu; | |
MyQueueHandleId = xQueueCreate(MaxQueueSize,MaxElementsPerQueue); /* Cretae a queue */ | |
if(MyQueueHandleId != 0) | |
{ | |
UART_Printf("\n\rQueue Created"); | |
xTaskCreate( MyTask1, ( signed char * )"Task1", configMINIMAL_STACK_SIZE, NULL, 3, &TaskHandle_1 ); | |
xTaskCreate( MyTask2, ( signed char * )"Task2", configMINIMAL_STACK_SIZE, NULL, 4, &TaskHandle_2 ); | |
vTaskStartScheduler(); /* start the scheduler */ | |
} | |
else | |
UART_Printf("\n\rQueue not Created"); | |
while(1); | |
return 0; | |
} | |
char TxBuffer[5][MaxElementsPerQueue]={"Hello world", "Good Morning", "welcome", "Free Rtos", "Good Bye"}; | |
char RxBuffer[5][MaxElementsPerQueue]; | |
static void MyTask1(void* pvParameters){ | |
unsigned char i; | |
LED_PORT = LED_Task1; /* Led to indicate the execution of Task1*/ | |
UART_Printf("\n\rTask1, Reading the data from queue"); | |
for(i=0;i<5;i++) | |
if(pdTRUE == xQueueReceive(MyQueueHandleId,RxBuffer[i],100)) | |
{ | |
LED_PORT = LED_Task1; /* Led to indicate the execution of Task1*/ | |
UART_Printf("\n\rBack in task1, Received data is:%s",RxBuffer[i]); | |
} | |
else | |
{ | |
LED_PORT = LED_Task1; /* Led to indicate the execution of Task1*/ | |
UART_Printf("\n\rBack in task1, No Data received"); | |
} | |
vTaskDelete(TaskHandle_1); | |
} | |
static void MyTask2(void* pvParameters) | |
{ | |
unsigned char i; | |
LED_PORT = LED_Task2; /* Led to indicate the execution of Task2*/ | |
UART_Printf("\n\rTask2, Filling the data onto queue"); | |
for(i=0;i<5;i++) | |
if(pdTRUE == xQueueSend(MyQueueHandleId,TxBuffer[i],100)) | |
{ | |
LED_PORT = LED_Task2; /* Led to indicate the execution of Task2*/ | |
UART_Printf("\n\rTask2: Successfully sent the data"); | |
} | |
else | |
{ | |
LED_PORT = LED_Task2; /* Led to indicate the execution of Task2*/ | |
UART_Printf("\n\rSending Failed"); | |
} | |
UART_Printf("\n\rExiting task2"); | |
vTaskDelete(TaskHandle_2); | |
} |
Output
Waveform