topic Re: Query related to ISR - MCF5282 Coldfire in ColdFire/68K Microcontrollers and Processors

Query related to ISR - MCF5282 Coldfire

Chandrashekar — Mon, 24 Apr 2006 18:11:25 GMT

I am writing Interrupt service routine to handle UART0 interrupt,

i want to know how i can map my ISR into the interrupt vector table, so that

when UART0 interrupt occurs it should execute my ISR.

Can anybody suggest me what are all the things i should configure for this

(i.e enabling/disabling some bits in SFR's and the files involved to do this like vector.s and so on),

I went thro' the Users manual of MCF5282, but i am little bit confused about

configuring my routine,

If there's any example about ISR mapping to Vector table it would be helpful.

Regards,

Manjunath Chandrashekar

Re: Query related to ISR - MCF5282 Coldfire

airswit — Mon, 24 Apr 2006 22:45:01 GMT

well, you have to set up the interrupt controller module:

set up the IMR bit for UART0
set up the ICR register for UART0
and, if you are using codewarrior and the include files from freescale, the mcf5xxx_set_handler() function should be available to use.

You also need to set up the uart module to enable interrupts, i believe.

hope some of that helps,
Trevor

Re: Query related to ISR - MCF5282 Coldfire

Chandrashekar — Tue, 25 Apr 2006 12:07:08 GMT

Hello,

Thank you for the information and i need few more clarifications from you,

i am currently using MCF5282LITE EVB board and unable to find the necessary

include files from Freescale(as stated by you).

I configured the ICR and IMR as suggested by you and

I am calling the below function in my application

setup_handler(64 + 13);//For UART0

but the interrupt is not getting invoked, i don't know what's wrong with my code.

void setup_handler(unsigned short vec_index)
{
unsigned long **autovector = (unsigned long **)0x20000000; // The Vector Base Address
*(autovector + vec_index) = (unsigned long *) &SCI1_tx_ISR;
}

Actually i am using vector.s, int_handlers.c files for handling interrupts,

can you guide me how to go about it,

if i get those include files to be used, it would be helpful.

Regards,

Chandrashekar