FreeRTOS is free real-time operating systems for embedded systems that currently supports over 30 different CPU architectures. It has a small memory footprint making it suitable for microcontrollers that do not have an external memory bus.

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Nested function scheduling using RTOS

I am trying to implement a Wireless RFID protocol onto a RTOS using Texas Instruments cc430. the protocol has its own stack and at the time being, uses timers to send and receive packets. I am trying ...
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46 views

Does priority inheritance cure priority inversion?

In the Mutex description page of the FreeRTOS website the following sentence can be find: Priority inheritance does not cure priority inversion From what I know I thought that priority ...
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134 views

RTOS: Why Do We Need Special Post versions for ISRs?

In some RT kernels, if you want to post to a semaphore or flag from an ISR, you need to call an special version of the method, instead of the regular one called from a normal task. Examples: ...
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402 views

RTOS for Cortex M4 with 802.15.4/6LoWPAN stack

I'm evaluating operating systems to use in an Internet of Things Project and I don't know what's the best way to proceed. I'm using a TM4C123GH6PM MCU with 32k RAM and a CC2520 802.15.4 transceiver, ...
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3answers
255 views

CMSIS and sub millisecond delays

We are running FreeRTOS with CMSIS. Is it possible, using CMSIS on STM32F3 Discovery board, to have periodic tasks running with periods less than 1 millisecond resolution? We want to run tasks at 400 ...
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327 views

Unable to read file greater than 2K in FatFS

I am reading a file from the SPI Flash with FATFS file system, on STM32F103 platform running FreeRTOS. I can successfully read File of size less the 2048, but if read a file file of size greater than ...
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1answer
488 views

FATFS porting on STM32F103 SPI Flash

I have ported FATFS for Free RTOS on STM32F103 SPI Flash of 32 Mbit. In a demo Application I have successfully created a file, written a file, and read back from the file. My requirement is like I ...
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1answer
258 views

Porting Linux drivers specifically I2C

I am developing an I2C driver for an accelerometer. My objectives (actually it's the restriction I have as per the project guidelines given in my institute): use Linux flavour of operating systems ...
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1answer
305 views

Using RTOS support in OpenOCD

I can see that OpenOCD is RTOS aware and it supports FreeRTOS, which I'm using at the moment. I have looked at various sources and cannot seem to figure how to use this feature.
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656 views

What shall be changed about stm32f4x7_eth_bsp.c

I am using STM32f407ZGT6. FreeRTOS is running perfectly on Board! I have included Ethernet files. According compilation of Windows Commander stating that it was compiled lacked free. But if one ...
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2answers
107 views

No boot messages are being diaplyed while booting FREERTOS

I asked a question on LCD display with FreeRTOS here. This time my question is a little bit different so I am posting as a new question. Normally I have seen that when we port Linux on any board ...
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72 views

Which will boot faster: FreeRTOS or MuCLINUX: need general guidelines?

Are there any general guidelines/thumb-rules to select OS? I have to port it on Cortex M3 based chip. Which OS should be selected: FreeRTOS or MuCLinux if I want the boot time minimum?
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231 views

How to display characters on LCD with FreeRTOS

I ported FreeRTOS on EFM32 based kit by EnergyMicro. After porting I want to develop a simple application that will display Hello World on the LCD. When we talk about windows OS, we have a function ...
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1answer
455 views

How to use FreeRTOS with MPLAB X that runs on a MAC OS

I'm programming my PIC microcontroller on a MAC OS. Can you use FreeRTOS with MPLAB X running on a MAC OS? I've noticed directions that include downloading a .exe file, but does that mean it's only ...
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2answers
692 views

FreeRTOS queues and IPC confusion

I'm struggling with my first real freeRTOS project. I am basically using an ATmega328P microcontroller and an nRF24L01+ radio as a "node". I have two of these nodes and I am using them to talk to each ...
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1answer
261 views

Do I need a RTOS?

My hardware would have a DSP with the following characteristics: Sound generation (internal parameter will generate pure tones, white noise, filtered white noise or the sum of them). I2C ...
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2answers
352 views

Booting FreeRTOS on ARM

I am building an embedded device (like a phone) that will run FreeRTOS. I am using an ARM Processor. How can I make my homebrew device boot FreeRTOS? Is there a special type of storage drive that I ...
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968 views

STM32F2 build environment

Would like to get an insight on how to build an environment with FreeRTOS +LWIP on eclipse for building a specific application on STM32. What do you recommend?