TIM2 interrupt problem

[madhu13]

Posted on August 18, 2010 at 10:09

TIM2 interrupt problem

#interrupt

[stforum2]

Posted on May 17, 2011 at 14:03

Seems to be OK.  Of course line  'RCC->APB2ENR='  is an error.

(1 << (TIM2_IRQChannel & 0x1F)); should evaluate to 0X10000000.  Does it? Is the address of TIM2_IRQhandler in the approrpiate vector location?

[madhu13]

Posted on May 17, 2011 at 14:03 hi, thank you for the response, i am not able to understand this NVIC->ISER[0] configuration, can you please explain me in detail i wrote same program for TIM1 that worked well.

[stforum2]

Posted on May 17, 2011 at 14:03

The NVIC is the Nested Vectored Interrupt Controller and it is part of the Cortex-M3 core.

To enable an interrupt in the Cortex-M3 core, a bit in one of the the NVIC's SETENEABLE registers must be set. In the case of timer 2 on an STM32 chip, bit 28 of register SETENABLE0_31 must be set. I presume that NVIC->ISER[0] is this SETENABLE0_31 register.  (We don't know for sure because we don't use your compiler.) In this case, the 0X1F mask does nothing since TIM2_IRQChannel is (or should be) 28. (1 << (TIM2_IRQChannel & 0x1F)) is therefore the same as (1 << TIM2_IRQChannel) The 0X1F mask is only required for channels that are greater than 31. If it is of interest, you can obtain the development tools that we use from here: http://www.crossware.com/trialware/21499113stm/index.htm You can use wizards to create all of the code you require and you can test it in the simulator before you run it on the hardware.

[madhu13]

Posted on May 17, 2011 at 14:03 i have enabled the 28th bit of ISER[0) reg but still i interrupt is not comming.........

[madhu13]

Posted on May 17, 2011 at 14:03

I came to what was the problem its in the interrupt subroutine name ie. void Void TIM2_IRQhandler(void) which should be Void  TIM2_IRQHandler(void) . now code is working fine thank you...