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

newbie - Writing drivers for FreeRTOS

Posted by cinese on September 20, 2007
Hi guys, I am a newbie here.

Is there any tutorial on how to create device drivers for FreeRTOS? If not, could somebody give me some guidelines and hints?

Thanks.

RE: newbie - Writing drivers for FreeRTOS

Posted by Borut on September 20, 2007
Well,

the basics are very simple. If you want to write drivers for let's say LCD, then you must decide if all task are allowed to send data directly to LCD or not:
-If yes then you would use semaphore to get access to the LCD and write data, then you
would release that semaphore.
-if not then you write an LcdTASK and you can send data to it using queues.
Besides this the rest of the code isn't that much different from a driver which is not used in an RTOS based code. Read some code samples that are included in the demo applications and you will get the picture. this demo code is very well written and very well commented.

Regards,

BOrut

RE: newbie - Writing drivers for FreeRTOS

Posted by cinese on September 20, 2007
Ok, I must say I haven't written any driver at all so far and I am getting confused. I was reading about how to write Linux drivers, but I am starting thinking things are quite different with RTOS. I mean, I don't need to bother about major/minor numbers, registering modules to the kernel and stuffs like that with RTOS, do I?

I am currently working on the PC Demo and I would like to add some driver, or at least to prepare a tutorial to show how to perform this task. Let's say I want to write a driver for my USB port:

1. Is it correct to say I actually need more than one driver: one to communicate over USB and then one for each kind of device I want to plug into my USB port?

2. Which are the basic steps I need to follow in order to write such drivers? Is it correct to say it basically comes to sending proper messages to the correct addresses?

Thank you,

Silvano


[ 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