Quality RTOS & Embedded Software

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


Freertos TWIM feature

Posted by mrigendra on February 24, 2014

I was creating a simple application to read an accelerometer chip as a task in freeRTOS. The problem is while executing the twim task , it stucks in a while loop in the driver.

I am using SAM4l and atmel studio 6 . to write or read there is a function call that takes the data to twim.c(the driver code) and in here the actual transfer is done. There are three interrupts that NACK, write and read.

for read there is a sleep function in the twim driver if low power is enabled like this

    while(!(transfer_status[twim_ch]) && !                                                                                                                                                       (twim_get_status(twim) & TWIM_SR_IDLE))

     while(!(transfer_status[twim_ch]) && !(twim_get_status(twim) & TWIM_SR_IDLE))

         /* disable master transfer */
           ...code to configure registers

for a simple read from accelerometer my code is stuck in read's sleep function. my code stuck in the if condition.

My query is 1) Is freeRTOS fully twim compatible? 2)Are there any typical issues like this?

Freertos TWIM feature

Posted by rtel on February 24, 2014


Freertos TWIM feature

Posted by mrigendra on March 10, 2014

I was hoping for some help instead of this link.....IBoard is sam4l xplained pro.This is code is from atmel studio 6 twim master driver.I am using FREERTOS and my device works good standalone(without freertos) .So I think its related to FREERTOS too.

[ 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.

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.


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


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