anybody is there who works on MCBSTR9 Evaluation Board

Well, It seems you are trying to generate a external interrupt by clicking S2 (P3.5 INT5).

I dont know:
1) Where do you give VIC1 the address of your handle function (what do you want your code to do when the interruption executes?)
2) Why do you write
VIC1->VCiR[10] = 0X05;
instead of
VIC1->VCiR[10] = 0X0A;
In the reference manual, VIC1.10 is the enter for WIU group. 10 is the interrupt source for P3.5, P3.6...
3) Why do you write on WIU->PR.
This must be written by hardware or using WIU->INTR to generate a software interrupt (and that's not the case)

My code is similar, but I have one problem: I cannot write on WIU->MR nor WIU->CTRL. Writing to those registers causes nothing at all. They are always clear.

Here is my code (reduced):

extern __irq void Switch_IRQ_Handler (void); /*Implemented in irq.c*/

void main(){

SCU->WKUPSEL |= 0x00000005; /*P3.5 generates interrupt*/ SCU->GPIOIN[3] |= 0xFF; /*All input. No problem at all*/

WIU->CTRL |= 0x00000002; /*WIU enabled This doesn't take effect*/ WIU->MR &= ~0x00000003; /*All unmasked. This doesn't take effect*/

GPIO3->DDR &= 0xDF; /*P3.5->input*/

/* Configure and enable IRQ for Switch S2 */ /* Debugging this doesn't shows anything wrong*/

VIC1->VAiR[10] = (unsigned int)Switch_IRQ_Handler;

VIC1->VCiR[10] |= 0x20; /* Enable vector interrupt*/

VIC1->VCiR[10] |= 10; /* Specify interrupt number*/

VIC1->INTER |= (1<<10); /*Enable interrupt*/

}

Can someone help me? What can be wrong?

Well, It seems you are trying to generate a external interrupt by clicking S2 (P3.5 INT5).

I dont know:
1) Where do you give VIC1 the address of your handle function (what do you want your code to do when the interruption executes?)
2) Why do you write
VIC1->VCiR[10] = 0X05;
instead of
VIC1->VCiR[10] = 0X0A;
In the reference manual, VIC1.10 is the enter for WIU group. 10 is the interrupt source for P3.5, P3.6...
3) Why do you write on WIU->PR.
This must be written by hardware or using WIU->INTR to generate a software interrupt (and that's not the case)

My code is similar, but I have one problem: I cannot write on WIU->MR nor WIU->CTRL. Writing to those registers causes nothing at all. They are always clear.

Here is my code (reduced):

extern __irq void Switch_IRQ_Handler (void); /*Implemented in irq.c*/

void main(){

SCU->WKUPSEL |= 0x00000005; /*P3.5 generates interrupt*/ SCU->GPIOIN[3] |= 0xFF; /*All input. No problem at all*/

WIU->CTRL |= 0x00000002; /*WIU enabled This doesn't take effect*/ WIU->MR &= ~0x00000003; /*All unmasked. This doesn't take effect*/

GPIO3->DDR &= 0xDF; /*P3.5->input*/

/* Configure and enable IRQ for Switch S2 */ /* Debugging this doesn't shows anything wrong*/

VIC1->VAiR[10] = (unsigned int)Switch_IRQ_Handler;

VIC1->VCiR[10] |= 0x20; /* Enable vector interrupt*/

VIC1->VCiR[10] |= 10; /* Specify interrupt number*/

VIC1->INTER |= (1<<10); /*Enable interrupt*/

}

Can someone help me? What can be wrong?

OK I finally got it.

Here is the solution:

//P3 configuration

SCU->GPIOOUT[3] &= 0xC3FF;
GPIO3->DDR &= 0x9F;

//WIU (AND SCU!!!) configuration
//Hey, I didn't did this before!!!!

SCU->PCGR1 |= 0x00002000;
SCU->PRR1 |= 0x00002000;

WIU->MR |= ~0x00000003;
WIU->CTRL |= 0x00000002;

SCU->WKUPSEL |= 0x00000005;

//VIC configuration

VIC1->VAiR[10] = (unsigned int)Switch_IRQ_Handler;
VIC1->VCiR[10] |= 0x20;
VIC1->VCiR[10] |= 10;
VIC1->INTER |= (1<<10);

And that's all to generate external interrupt by S2 (or other WIU sources).

Don't forget to acknowledge the interrupt in handler function and to clear EXTINT5 bit (WIU->PR |= 0x00000020;)

You can also work with ST librarys if you don't like to work at bit level. They got smart functions that do it for you.

Bye!