FreeRTOS Support Archive
The FreeRTOS support forum is used to obtain active support directly from Real
Time Engineers Ltd. In return for using our top quality software and services for
free, we request you play fair and do your bit to help others too! Sign up
to receive notifications of new support topics then help where you can.
This is a read only archive of threads posted to the FreeRTOS support forum.
The archive is updated every week, so will not always contain the very latest posts.
Use these archive pages to search previous posts. Use the Live FreeRTOS Forum
link to reply to a post, or start a new support thread.
[FreeRTOS Home] [Live FreeRTOS Forum] [FAQ] [Archive Top] [March 2007 Threads] xSerialPutChar problemPosted by Nobody/Anonymous on March 6, 2007 I have a problem with serial communication.
I made a simple task that send 'A' once per second (PIC18F4550 with MPLAB C 7.52)
On Window's Hyperterminal, 'A' appears once per 5 seconds.
I suspect queue caused the trouble(I declared serial queue length to 5 )
#define mainCOMMS_QUEUE_LENGTH( 5 )
Please tell me what's wrong.
Regards
Sohn, Seoul, Korea
static void vTest( void *pvParameters ) { for( ;; ) {
vTaskDelay( 900); xSerialPutChar( NULL, 'A', 100 ); vParTestToggleLED(2); vTaskDelay( 100); vParTestToggleLED(2);
} }
RE: xSerialPutChar problemPosted by Nobody/Anonymous on March 6, 2007 From the code it looks like A should be sent every 1000 ticks, but there is nothing to say what one tick represents. It could be that the tick is running 5 times slower than you think. Most likely the thing that is wrong is the setup of the timer that is generating the tick.
Check the configTICK_RATE_HZ and configCPU_CLOCK_HZ settings in FreeRTOSConfig.h along with prvSetupTimerInterrupt() in port.c. If these are both right take a look at your initialization code to see how you are setting up the processor clock frequency.
Dave.
Copyright (C) Amazon Web Services, Inc. or its affiliates. All rights reserved.
|