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Allen_2020
Beginner
373 Views

alt_irq_register is Unable to return normally

alt_irq_register

hello everybody !

I look forward to your help !

The development environment : Quartus II 13.1 (64-bit);   

Eclipse IDE for C/C++ Developers(Version: Indigo Service Release 2)

FPGA model :EP4CE75U19I7N

  The following code:

int uart_init(void)

{

//  printf("Hello from Nios II-3-1!\n");

//         usleep(1000*1000);

    alt_irq_register(DEVICECTRL_0_IRQ, NULL,Button_Irq_Handler);     //1906 line

//         usleep(1000*1000);

//  printf("Hello from Nios II-3-2!\n");

//         usleep(1000*1000);

    set_tr_type(0);  //End data transfer

    printf("Hello from Nios II-3-3!\n");

           usleep(1000*1000);

   return 0;

}

 

calling  alt_irq_register.c   :

int alt_irq_register (alt_u32 id,
void* context,
alt_isr_func handler)
{
int rc = -EINVAL;
alt_irq_context status;

if (id < ALT_NIRQ)
{
/*
* interrupts are disabled while the handler tables are updated to ensure
* that an interrupt doesn't occur while the tables are in an inconsistant
* state.
*/

status = alt_irq_disable_all ();

alt_irq[id].handler = handler;
alt_irq[id].context = context;

 rc = (handler) ? alt_irq_enable (id): alt_irq_disable (id);     //95 line

alt_irq_enable_all(status);
}
return rc;
}

 

In alt_IRq_register.c, alt_irq_enable (ID) will be executed when the handle is true, 

in line 1906 of Uart.c, call this function alt_irq_register(DEVICECTRL_0_IRQ, NULL,Button_Irq_Handler);

Start registering interrupt functions. According to the definition of this function parameter, the first parameter is IRQ, interrupt priority number,The second argument is null, never mind, and the third argument is the sentence returned by the interrupt function.

Finally stop at alt_irq_enable_all(status);

This function is then called as follows

 

static ALT_INLINE void ALT_ALWAYS_INLINE
alt_irq_enable_all (alt_irq_context context)
{
#if (NIOS2_NUM_OF_SHADOW_REG_SETS > 0) || (defined NIOS2_EIC_PRESENT) || \
(defined NIOS2_MMU_PRESENT) || (defined NIOS2_MPU_PRESENT)
alt_irq_context status;

NIOS2_READ_STATUS (status);

status &= ~NIOS2_STATUS_PIE_MSK;
status |= (context & NIOS2_STATUS_PIE_MSK);

NIOS2_WRITE_STATUS (status);
#else
NIOS2_WRITE_STATUS (context);   //  The debug program stops here
#endif
}

that's all.

Thanks in advance.

 

 

 

 

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4 Replies
BoonBengT_Intel
Moderator
295 Views

Hi @Allen_2020,

Thank you for posting in Intel community forum and hope you are doing well.
Further clarification, do you mind explaining more on what do you mean by normal?
Also do you see any error or warning upon compiling?

There are some design example that you can refer to which is using the interrupt request here.
More details for the HAL Api function can also be found here.

Warm regards.

Allen_2020
Beginner
273 Views

Hi Warm,
The normal return I said refers to the program running down after the interrupt registration is successful. The current phenomenon is that the program can't run out of the interrupt registration function. Debug locates to the following code:

static ALT_INLINE void ALT_ALWAYS_INLINE
alt_irq_enable_all (alt_irq_context context)
{
#if (NIOS2_NUM_OF_SHADOW_REG_SETS > 0) || (defined NIOS2_EIC_PRESENT) || \
(defined NIOS2_MMU_PRESENT) || (defined NIOS2_MPU_PRESENT)
alt_irq_context status;

NIOS2_READ_STATUS (status);

status &= ~NIOS2_STATUS_PIE_MSK;
status |= (context & NIOS2_STATUS_PIE_MSK);

NIOS2_WRITE_STATUS (status);
#else
NIOS2_WRITE_STATUS (context);   //  The debug program stops here
#endif
}
 
 
The code is compiled with no errors and more warnings, as shown below:
111.png

 

allen regards !
BoonBengT_Intel
Moderator
194 Views

Hi @Allen_2020,

Looking on the code that you have, I am suspecting there might be something off with the way the alt_irq_register are invoked, maybe the parameters.
Possible for you to share your quartus project for us to look into further more?

Note: for the time being here is a different design example which make use of HAL api reference here and you can have a look at it. (download the example 'an459-design-files.zip', it is based on the following guideline)

Warm regards.

BoonBengT_Intel
Moderator
172 Views

Hi @Allen_2020,

Hope this message find you well and good day, as we do not receive any response from you to the previous clarification that we have provided. Please post a response in the next 15 days to allow me to continue to support you. After 15 days, this thread will be transitioned to community support. The community users will be able to help you with your follow-up questions. 

 

Warm Regards

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