Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [freertos]

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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STM32F407 + LAN8720A + lwIP + FreeRTOS = No received Ethernet frames

I'm trying to bring up a PCB that uses an STM32F407 and LAN8720A Ethernet PHY, and I can't seem to receive any Ethernet frames — even though I have no problem transmitting frames. Hardware setup I have a 25 MHz crystal on the STM32F4, driving a 25…
Jay Carlson
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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, it would be great if the system already provided…
user1273684
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FreeRTOS on STM32 - What API should be used: CMSIS-RTOS API (v1 or v2) or FreeRTOS API?

According to ST's user manual UM1722 "Developing wireless applications on STM32Cube with RTOS" there are two APIs available: Generic CMSIS-RTOS API (v1 or v2) FreeRTOS API The CMSIS-RTOS API located in the CMSIS_RTOS_V2 folder generated by CubeMX…
Fedor Chervyakov
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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 2048, (As i am reading in chunks of 128 bytes) it…
CAK
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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 other. I have successfully ported freeRTOS to my…
NickHalden
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STM32 crashes when FreeRTOS project is converted to C++

I am experimenting with STM32F303RE Nucleo board on SW4STM32 with FreeRTOS v10.1.1 and I was thinking of parsing NMEA sentences by adding the characters to a buffer using UART interrupt and then process them at my convenience in a task. Since most…
scriptsNgiggles
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Why use FREERTOS instead of the interrupt mechanism on a microcontroller?

This might be a very stupid question. I have experience with embedded software on bare-metal and just started with FREERTOS. However I don't really understand why one would use FREERTOS instead of the built in interrupt mechanism. The goal of…
LandonZeKepitelOfGreytBritn
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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: xSemaphoreGiveFromISR() instead of xSemaphoreGive() in…
Mister Smith
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Must FreeRTOS task stack size account for interrupt stack size?

I have FreeRTOS running on a MKE06 Cortex-M0+ (based on SAMD20 demo), GCC toolchain. I am trying to figure out optimal task stack sizes (with the help of avstack.pl). I want to use only static memory allocation. In the FAQ I have read this: The…
filo
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Use STM32 interrupt with FreeRTOS

I'm confused in using HAL-defined interrupts with FreeRTOS. I'm trying to implement "6.3 Deferred Interrupt Processing" in the guide of FreeRTOS, but I don't know how to do it. The problem is how to use the peripherals of the STM32 with FreeRTOS.…
Ramo
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SD Card Buffer in FreeRTOS

One of my tasks in a project is responsible for gathering information about values measured from sensors and write information in a .txt file on an SD card. What would be the best way to do this? Right now, I create a task with 25000 size of stack…
user54506
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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.
errordeveloper
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FreeRTOS is slow to wake after long processor sleep

(Cross-posted on Stack Overflow) I'm using FreeRTOS in an application which requires the processor to sleep in low power mode for a long time (as long as 12 hours), then wake up in response to an interrupt request. I'm having a problem with the…
harry courtice
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STM32H747 MDMA Transfer Error Address when using FreeRTOS

I'm using the MDMA to communicate with an external flash over QUADSPI. I have an implementation which works great without FreeRTOS, but when I implement it using FreeRTOS I get Transfer Error Address. I have verified that the RAM address exists in…
GBohlin
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FreeRTOS scheduler is not triggering the TASK

I am programming an STM32F103 for my project and recently switched from bare-metal to RTOS (FreeRTOS to be specific) without using CubeMX (code attached below.) For now, I am simply running an LED toggling program using FreeRTOS with a single task…
No Man
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