Setup an IRQ on a component

Hi,

you have to use the "create new component" tool in SOPC builder: insert your HDL file in the "HDL files"page and then specify your pins function in the "signals" page, nad in your case your interupt pin. Before you had to define your interupt as an output pin of your HDL component.

bye

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originally posted by soin@Sep 19 2006, 05:12 PM

hi,

you have to use the "create new component" tool in sopc builder: insert your hdl file in the "hdl files"page and then specify your pins function in the "signals" page, nad in your case your interupt pin. before you had to define your interupt as an output pin of your hdl component.

bye

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Hi Soin,

I already added my counter component to SOPC Builder. Here is the wrapper which instantiates the task logic of counter and its interface (defining control , status , ... registers) :

module counter_avalon_interface

(

clk , // global signal , clk , 1bit , input

reset_n , // global signal , reset , 1bit , input

chipselect , // avalon_slave 0 , chipselect , 1bit , input

address , // avalon_slave_0 , address , 2bit , input

write , // avalon_slave_0 , write , 1bit , input

writedata , // avalon_slave_0 , writedata , 8bit , input

read , // avalon_slave_0 , read , 1bit , input

readdata , // avalon_slave_0 , writedata , 8bit , output

counter_out, // avalon_slave_0 , writedata , 8bit , export

intr // avalon_slave_0 , writedata , 1bit , export ?????

);

I also assigned counter_out to LED&#39;s but I am not sure of :

1) what pin I should assign intr to make CPU interrupted when it is high.

2) What I should do with my component to make it CPU-interruptable like UART , PIO , ....

Have you got ideas about this ?

Regards,

Quan

Hi Soin,

Thank you very much for your tips. I did it!!!

I almost forgot irq pin in signal tab of component editor.

Thanks,

Quan

Hello ,

I map the signals as following :

module counter_avalon_interface

(

clk , // global signal , clk , 1bit , input

reset_n , // global signal , reset , 1bit , input

chipselect , // avalon_slave 0 , chipselect , 1bit , input

address , // avalon_slave_0 , address , 2bit , input

write , // avalon_slave_0 , write , 1bit , input

writedata , // avalon_slave_0 , writedata , 8bit , input

read , // avalon_slave_0 , read , 1bit , input

readdata , // avalon_slave_0 , writedata , 8bit , output

counter_out, // avalon_slave_0 , writedata , 8bit , export

intr // avalon_slave_0 , irq , 1bit

);

and use this code in NIOS IDE to "process" the interrupt :

# include <stdio.h># include <sys/alt_irq.h># include <io.h>

# include "counter_routines.h"# include "system.h"# include "altera_avalon_uart_regs.h"

void counter_isr( int context );

int main()

{

int context = 0;

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

SetInterrupt( COUNTER_0_BASE ); // enable IRDY , my own HAL driver

alt_irq_register( COUNTER_0_IRQ , &context , counter_isr );

while( 1 )

{

}

return 0;

}

void counter_isr( int context )

{

// output &#39;Y&#39; to UART

IOWR_ALTERA_AVALON_UART_TXDATA( UART1_BASE , &#39;Y&#39; );

}

-------

It seemed that CPU wasn&#39;t interrupted.

Anybody has got this issue before ?

Thanks,

Quan

Hi,

are you sure your component generate interupt?is your uart working well?You could try to set a variable, checking it in the main loop, and printf through uart-jtag or uart, using the HAL library instead of writing register...

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originally posted by soin@Sep 20 2006, 02:29 PM

hi,

are you sure your component generate interupt?is your uart working well?you could try to set a variable, checking it in the main loop, and printf through uart-jtag or uart, using the hal library instead of writing register...

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Hi Soin,

> are you sure your component generate interupt?# ## Yes , I am. I checked intr pin. It does go high whenever the counter reaches 7.

> is your uart working well?You could try to set a variable, checking it in the main loop, and printf through uart-jtag or uart, using the HAL library instead of writing register...# ## Yes , my UART is working well. I tested it in a seperate project by using this function in HAL library :

IOWR_ALTERA_AVALON_UART_TXDATA( UART1_BASE , &#39;Y&#39; );

After testing these stuff , I assign intr pin to irq in component editor , signal tab ; then recompile the System , Quartus project and NIOS IDE program but things are not better.

Have I got some steps missed ?

Thank you ,

Quan

Hi,

How long does your interupt signal stay high?Nios interupt is level sensitive, so maybe your interupt signal is too short and the processor doesn&#39;t detect the interupt.In general your peripheral should assert interupt pin, and it should stay high (or low) as long as the Nios acknoledges the interupt, for example writing a bit in a peripheral&#39;s register .It&#39;s only an idea...

bye

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originally posted by soin@Sep 21 2006, 03:31 PM

hi,

how long does your interupt signal stay high?nios interupt is level sensitive, so maybe your interupt signal is too short and the processor doesn&#39;t detect the interupt.in general your peripheral should assert interupt pin, and it should stay high (or low) as long as the nios acknoledges the interupt, for example writing a bit in a peripheral&#39;s register .it&#39;s only an idea...

bye

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Hi Soin,

My interrupt signal stays high in 1 clock.

How do I know NIOS acknowledges the interrupt ?

Have you got any documents discussing about these (the "lenghth" of interrupt signal and NIOS interrupt acknowledgement) ?

Thank you,

Quan

Hi Soin ,

I did it !!! As you guess , my interrupt signal is too short for NIOS to recognize. I made it long until NIOS receives IRQ and processes ISR in which I de-activate the interrupt signal.

Now it really works!!!!

Thank you very much, Soin

Quan

Hi quan

Can you send me your source??

Thanks