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


Atmel SAM4S-EK USART SPI support

Posted by Goldie13 on June 24, 2013

I want to work with USART1 in SPI mode.
I took the freertos_spi API and adjusted the functions: init, write, read to work with USART registers and addresses…
I also took the local_spi_handler and adjusted it to work for the USART, so now, I want to call it from USART1_Handler, the same way it does from the SPI_Handler.
How do I make USART1_Handler to be called upon interrupts – I believe this is what I need to do…right?


RE: Atmel SAM4S-EK USART SPI support

Posted by Dave on June 24, 2013
From your post I'm assuming you are using the FreeRTOS ASF drivers as a template.

If I understand you correctly you are just wanting to install USART1_Handler in the vector table, so it is called automatically when USART1 interrupt fire. Is this right?

If so, and you are using Atmel Studio with ASF? You should have a file called exceptions.c that lists the default names for all the interrupt handlers. The names will be declared as weak symbols so all you need to do is provide your own version of the Handler function and that will get used in place of the weak symbol.

In other words, if you find the default name for the USART1 interrupt handler is called USART1_Handler(), which seems likely, then all you need to do is provide a function called USART1_Handler() for it to get used. Obviously it will only get called if you have enabled the interrupt in the USART.

[ 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