Quality RTOS & Embedded Software

 Real time embedded FreeRTOS RSS feed 
Real time embedded FreeRTOS mailing list 
Quick Start Supported MCUs PDF Books Trace Tools Ecosystem TCP & FAT Training




Loading

QUEUE RECEIVE FROM ISR

Posted by Piero B on July 8, 2009
Hi.
i want to discuss for a new feature for future implementation.
Actually it is possible to syncronize ISR and task using semaphore (giveFromISR - take from Task). But sometimes i need (it could be useful IMO) that a task notifies something to ISR driver (for example, "pause acquisition"), without using global flag or calling a function and in task-safe mode . I can imagine the first objection of Richard: a task can wait on Q, and stay in wait state, and the scheduler can put it in ready when an element is present on the queue, for the ISR is a nonsense. But i'm imaging something similar to queueReceive, without the waitDelay, without a switch, because the ISR should only check if an element is present, and the rtos can only garantee that task cannot send element if the q is full, and remove element when the ISR read th element.

Sorry if my post is a little confused... i hope it was clear my idea.

Bye
Piero

RE: QUEUE RECEIVE FROM ISR

Posted by Richard on July 8, 2009
There is already an xQueueReceiveFromISR() function. Is this any good for your purpose.

Regards.


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




Copyright (C) 2004-2010 Richard Barry. Copyright (C) 2010-2016 Real Time Engineers Ltd.
Any and all data, files, source code, html content and documentation included in the FreeRTOSTM distribution or available on this site are the exclusive property of Real Time Engineers Ltd.. See the files license.txt (included in the distribution) and this copyright notice for more information. FreeRTOSTM and FreeRTOS.orgTM are trade marks of Real Time Engineers Ltd.

Latest News:

FreeRTOS V9.0.0 is now available for download.


Free TCP/IP and file system demos for the RTOS


Sponsored Links

⇓ Now With No Code Size Limit! ⇓
⇑ Free Download Without Registering ⇑


FreeRTOS Partners

ARM Connected RTOS partner for all ARM microcontroller cores

Renesas Electronics Gold Alliance RTOS Partner.jpg

Microchip Premier RTOS Partner

RTOS partner of NXP for all NXP ARM microcontrollers

Atmel RTOS partner supporting ARM Cortex-M3 and AVR32 microcontrollers

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

Xilinx Microblaze and Zynq partner

Silicon Labs low power RTOS partner

Altera RTOS partner for Nios II and Cortex-A9 SoC

Freescale Alliance RTOS Member supporting ARM and ColdFire microcontrollers

Infineon ARM Cortex-M microcontrollers

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

Cypress RTOS partner supporting ARM Cortex-M3

Fujitsu RTOS partner supporting ARM Cortex-M3 and FM3

Microsemi (previously Actel) RTOS partner supporting ARM Cortex-M3

Atollic Partner

IAR Partner

Keil ARM Partner

Embedded Artists