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[FreeRTOS Home] [Live FreeRTOS Forum] [FAQ] [Archive Top] [June 2012 Threads] Error with xQueueCreatePosted by Diamel Sarmiento on June 26, 2012 Hi, I'm ussing FreeRTOS and when i try to create a quoue the MPLAB Compiler give me the next error:
MPLINK 4.1, Linker Copyright (c) 2006 Microchip Technology Inc. Error - could not find definition of symbol 'xQueueCreate' in file 'Objects\main.o'. Errors : 1
i'm doing as the Reference Manual says:
#define QUEUE_LENGHT 5 #define QUEUE_ITEM_SIZE sizeof( AMessage )
typedef struct A_Message { char ucMessageID; char ucData[20];
} AMessage;
void main( void ){
xQueueHandle xQueue;
xQueue = xQueueCreate(QUEUE_LENGHT, QUEUE_ITEM_SIZE);
I hope someone can helpme, thanks.
RE: Error with xQueueCreatePosted by Richard on June 27, 2012 I presume you have #include "FreeRTOS.h" and #include "queue.h" in you source file? Are you building queue.c as part of your project?
I suggest taking the demo project details on this page http://www.freertos.org/port_PIC32_MIPS_MK4.html as a start. There are both MPLAB 8 and MPLAB X project, and it includes a simple blinky demo that uses a couple of tasks and a queue. When that compiles (and runs) you can take the demo code out, leaving the FreeRTOS source files in, and add in your own code.
Regards.
RE: Error with xQueueCreatePosted by Diamel Sarmiento on June 28, 2012 thanks richard!! i can create a queue now, my misstake was the queue.c that i didnt have in the project.. Now my problem is when i try to use xQueueReceive, the reading is 0x66 ever, i put send and receive in the same task to find the problem: “ static xQueueHandle xQueueUART;
void main( void ){
xQueueUART = xQueueCreate( 10, sizeof( portCHAR ) );
vPortInitialiseBlocks();
Configure_Ports();
xTaskCreate( vtaskA, ( const char * const ) "T1", configMINIMAL_STACK_SIZE, NULL, PRIORITY_taskA, NULL );
vTaskStartScheduler();
}
static void vtaskA( void *pvParameters ){
int Data='A'; int Data2;
for(;;) {
xQueueSend(xQueueUART,&Data,( portTickType ) 0); xQueueReceive(xQueueUART,&Data2,portMAX_DELAY);
putcUSART(Data2); while(BusyUSART()); }
}[/quote
”
RE: Error with xQueueCreatePosted by Diamel Sarmiento on June 28, 2012 but write in USART 0x66 that is the Data2 valor.
RE: Error with xQueueCreatePosted by Richard on June 29, 2012 Your queue is created to hold 8 bit types, and when you send data to the queue you pass it a pointer to a 32 bit type.
You are sending the letter 'A', which is ascii 65, so I would expect to receive decimal 65, not hex 66, but that might be something to do with the mismatch in types.
Regards.
RE: Error with xQueueCreatePosted by Diamel Sarmiento on July 6, 2012 you was right richard!! I changed the variable to char and now is working.
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