Quality RTOS & Embedded Software

 Real time embedded FreeRTOS RSS feed 
Quick Start Supported MCUs PDF Books Trace Tools Ecosystem


Loading

Lpc2106 Uart Problems

Posted by Cminor Dimitris Ps on November 8, 2008
Hello Everyone,
I'm new to this stuff and i'm experimenting with an Olimex Lpc2106 board using FreeRTOS.
I have some problems with the Uart Driver though (the one included in demo application).

I have three tasks, the two of them blink 2 leds, and the third is used for sending a string to uart0 and receive something. I use Teraterm as terminal.

The problem is :
When I receive ONE char, everything works well, and I can resend it to Uart :

xSerialGetChar( xPort, &jimR, comRX_BLOCK_TIME );
xSerialPutChar( xPort, jimR, comNO_BLOCK );

But, when I want to receive a string, using an array variable, if I send any char everything hangs. (Assume I send only 2 chars)

char *array;
xSerialGetChar( xPort, &array[0], comRX_BLOCK_TIME );
xSerialGetChar( xPort, &array[1], comRX_BLOCK_TIME );

This does not happen if I use two different variables for my two chars :

xSerialGetChar( xPort, &jimR, comRX_BLOCK_TIME );
xSerialGetChar( xPort, &jimR2, comRX_BLOCK_TIME );
xSerialPutChar( xPort, jimR, comNO_BLOCK );
xSerialPutChar( xPort, jimR2, comNO_BLOCK );

Any thoughts..?

Regards, Dimitris

RE: Lpc2106 Uart Problems

Posted by MEdwards on November 8, 2008
char *array -> This only defines a pointer to a character, not an array. You need char array[2].


[ Back to the top ]    [ About FreeRTOS ]    [ Privacy ]    [ Sitemap ]    [ ]


Copyright (C) Amazon Web Services, Inc. or its affiliates. All rights reserved.

Latest News

NXP tweet showing LPC5500 (ARMv8-M Cortex-M33) running FreeRTOS.

Meet Richard Barry and learn about running FreeRTOS on RISC-V at FOSDEM 2019

Version 10.1.1 of the FreeRTOS kernel is available for immediate download. MIT licensed.

View a recording of the "OTA Update Security and Reliability" webinar, presented by TI and AWS.


Careers

FreeRTOS and other embedded software careers at AWS.



FreeRTOS Partners

ARM Connected RTOS partner for all ARM microcontroller cores

Espressif ESP32

IAR Partner

Microchip Premier RTOS Partner

RTOS partner of NXP for all NXP ARM microcontrollers

Renesas

STMicro RTOS partner supporting ARM7, ARM Cortex-M3, ARM Cortex-M4 and ARM Cortex-M0

Texas Instruments MCU Developer Network RTOS partner for ARM and MSP430 microcontrollers

OpenRTOS and SafeRTOS

Xilinx Microblaze and Zynq partner