<?xml version="1.0" encoding="UTF-8" ?>
<?xml-stylesheet type="text/xsl" href="https://community.arm.com/utility/feedstylesheets/rss.xsl" media="screen"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/" xmlns:wfw="http://wellformedweb.org/CommentAPI/"><channel><title>LPC3250 IRQ_HANDLER HELP</title><link>https://community.arm.com/developer/tools-software/tools/f/keil-forum/25828/lpc3250-irq_handler-help</link><description> 
Hi Please Help me out for interrupts on LPC3250. How to
enable interrupt handler.my program like below 

 
TIMCLK_CTRL1|=0x08; // Enable timer clock
T1CTCR = 0x00; //use as a timer
T1TCR =0x01; // enable timer
T1MCR =0x00000018; // match reg 1
T1MR1</description><dc:language>en-US</dc:language><generator>Telligent Community 10</generator><item><title>RE: LPC3250 IRQ_HANDLER HELP</title><link>https://community.arm.com/thread/153611?ContentTypeID=1</link><pubDate>Sat, 31 Jul 2010 01:31:19 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:2d5a266e-19bc-416e-9c53-fdb62f0f8462</guid><dc:creator>Non Keil Related</dc:creator><description>&lt;p&gt;&lt;p&gt;
You now have the fundamental ability to get a timer going and
processing an interrupt from it.&lt;/p&gt;

&lt;p&gt;
You also now know where to look in the reference manual for the
infomation concerning each.&lt;/p&gt;

&lt;p&gt;
The same section in the reference manual clearly describes what
facilities are available and how they should be configured.&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: LPC3250 IRQ_HANDLER HELP</title><link>https://community.arm.com/thread/148415?ContentTypeID=1</link><pubDate>Fri, 30 Jul 2010 22:22:21 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:8949ab63-df81-4250-ae96-f9e1aed0426a</guid><dc:creator>eswar g</dc:creator><description>&lt;p&gt;&lt;p&gt;
need help again. I want to capture an interrupt which is coming on
CAP3.0 for every 20ms. The interrupt coming from another device for
every 20ms.&lt;/p&gt;

&lt;pre&gt;
        TIMCLK_CTRL1|=0x04;// Enable timer clock
        T0CTCR          = 0x1F; //use as CAP 3 Register
        T0CCR           &amp;amp;=~0x0E00;// Making CAP 0
        T0TCR           =0x01;  // enable timer
        T0MCR           =0x00000018;// enable interrupt




        MIC_APR         &amp;amp;= ~0x00010000;
        MIC_ATR         &amp;amp;= ~0x00010000;
        MIC_ITR         &amp;amp;=~0x00010000;
        MIC_ER          |= 0x00010000;
&lt;/pre&gt;

&lt;p&gt;
Can you please tell me the procedure to capture.&lt;br /&gt;
Thank you.&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: LPC3250 IRQ_HANDLER HELP</title><link>https://community.arm.com/thread/148159?ContentTypeID=1</link><pubDate>Thu, 29 Jul 2010 02:32:54 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:757c5169-8413-48db-8038-f148e4ef01c6</guid><dc:creator>eswar g</dc:creator><description>&lt;p&gt;&lt;p&gt;
Thank you very much for helping. now i&amp;#39;m able to generate
interupt.&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: LPC3250 IRQ_HANDLER HELP</title><link>https://community.arm.com/thread/147627?ContentTypeID=1</link><pubDate>Thu, 29 Jul 2010 01:46:06 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:8b061d2b-e897-42e4-b28a-8d44149b61de</guid><dc:creator>Non Keil Related</dc:creator><description>&lt;p&gt;&lt;p&gt;
&lt;i&gt;&amp;quot;Project is very big and confidential also.&amp;quot;&lt;/i&gt;&lt;/p&gt;

&lt;p&gt;
Really?&lt;/p&gt;

&lt;p&gt;
Anyway ... You&amp;#39;re falling off the end of &amp;#39;main&amp;#39;!&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: LPC3250 IRQ_HANDLER HELP</title><link>https://community.arm.com/thread/146576?ContentTypeID=1</link><pubDate>Thu, 29 Jul 2010 01:33:20 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:1f1a045a-b155-4d01-917e-7f66a4035ba8</guid><dc:creator>eswar g</dc:creator><description>&lt;p&gt;&lt;p&gt;
Project is very big and confidential also. But i need support. i&amp;#39;m
sending the program which i&amp;#39;m testing.&lt;br /&gt;
&lt;b&gt;C File&lt;/b&gt;&lt;/p&gt;

&lt;pre&gt;

#include&amp;quot;LPC325x.h&amp;quot;


//void Init_INTERRUPT(void);
void uart5_init(void);
void send_data(unsigned char ch);
unsigned char  receive_data (void);
//void timer1Handler(void) __irq;
void Irq_Other (void);
void Irq_Timer1(void);

main()
{

        P2_MUX_SET|=0x00000008;
        P2_DIR_SET|=0x00001820;
        P_MUX_SET |=0x8000;
        LCD_CTRL=0x00000000;


        uart5_init();
        send_data(&amp;#39;H&amp;#39;);
        TIMCLK_CTRL1|=0x08;             // Enable timer clock
        T1CTCR          = 0x00;                 //use as a timer
        T1TCR           =0x01;                  // enable timer
        T1MCR           =0x00000018;    // enable interrupt
        T1MR1           =0x0001387;             // reset and gives interrupt when match occurs

        T1TC            =0x00000000;

        T1PC            =0x00000000;
        T1PR            =0x00000004;     //set timer frequency to 1h

        T1EMR           =0x00C0;                // When match occurs Toggle


        MIC_APR         &amp;amp;=~0x00020000;
        MIC_ATR         &amp;amp;=~0x00020000;      // Timer 1 Edge interrupt
        MIC_ITR         &amp;amp;=~0x00020000;      // IRQ interrupt
        MIC_ER          |= 0x00020000;

}



void  IRQ_Handler(void) __irq
        {
         if ((MIC_SR&amp;amp;0x00020000)!=0)
            {

           Irq_Timer1();

                 T1IR = 0x02;  // Clear/Acknowledge the interrupt request
                }
         else
                {
                 Irq_Other();
                }
        }



void Irq_Timer1(void)
{
unsigned int i;

        while(1)
        {
                P2_OUTP_SET|=0x00001820;           // LED&amp;#39;s Toggle
                                                                for(i=0;i&amp;lt;60000;i++);
                                                                for(i=0;i&amp;lt;60000;i++);
                                                                for(i=0;i&amp;lt;60000;i++);
                                                                for(i=0;i&amp;lt;60000;i++);
                                                                for(i=0;i&amp;lt;60000;i++);
                                                                for(i=0;i&amp;lt;60000;i++);
                                                                for(i=0;i&amp;lt;60000;i++);
                                                                for(i=0;i&amp;lt;60000;i++);
                P2_OUTP_CLR|=0x00001820;
                                                                for(i=0;i&amp;lt;60000;i++);
                                                                for(i=0;i&amp;lt;60000;i++);
                                                                for(i=0;i&amp;lt;60000;i++);
                                                                for(i=0;i&amp;lt;60000;i++);
                                                                for(i=0;i&amp;lt;60000;i++);
                                                                for(i=0;i&amp;lt;60000;i++);
                                                                for(i=0;i&amp;lt;60000;i++);
                                                                for(i=0;i&amp;lt;60000;i++);
        }


}

void Irq_Other (void) // Sending u to hyper terminal and Turn off my LED&amp;#39;s
{
 send_data(&amp;#39;u&amp;#39;);
 P2_OUTP_CLR|=0x00001820;
}

/****************************************************************************************
*Function    :send_data
*Inputs      :string
*Output      :none
*Purpose         :To print the string on serial port
****************************************************************************************/
void send_data(unsigned char ch)
{
 U5THR=ch;
 while(!(U5LSR &amp;amp; 0x20));
}

/****************************************************************************************
*Function    :receive_data
*Inputs      :string
*Output      :none
*Purpose         :To print the string on serial port
****************************************************************************************/

 unsigned char  receive_data (void)
  {
           unsigned char ch;
        while(!(U5LSR&amp;amp;0x01));
         ch=U5RBR;
         return(ch);
   }

/****************************************************************************************
*Function    :uart5_init
*Inputs      :
*Output      :
*Purpose         :
****************************************************************************************/
void uart5_init(void)
 {
        //UART_CLKMODE=0x00084010;      // uart 4 selected
        UART_CLKMODE=0x00104100;        // uart 5 selected
        U5LCR=0x83;                                     //DLAB enable,odd parity,disble break transmission,1 stop bit,8 bit character length
        U5CLK =0x00000101;                      //x=1,y=1..115200
        U5DLL=0x07;                             //115200 baud rate
        U5DLM=0x00;
        U5LCR=0x03;                                     //DLAB enable,odd parity,disble break transmission,1 stop bit,8 bit character length
 }
&lt;/pre&gt;

&lt;p&gt;
&lt;b&gt;.s File&lt;/b&gt;&lt;/p&gt;

&lt;pre&gt;

&lt;br /&gt;

               LDR     PC,IRQ_Addr
                LDR     PC,FIQ_Addr

&lt;br /&gt;

                                ;PRESERVE8 {FALSE}
                        IMPORT  IRQ_Handler

&lt;br /&gt;

Reset_Addr      DCD     Reset_Handler
Undef_Addr      DCD     Undef_Handler
SWI_Addr        DCD     SWI_Handler
PAbt_Addr       DCD     PAbt_Handler
DAbt_Addr       DCD     DAbt_Handler
                DCD     0               ; Reserved Address
IRQ_Addr        DCD     IRQ_Handler
FIQ_Addr        DCD     FIQ_Handler

&lt;br /&gt;

Undef_Handler   B       Undef_Handler
SWI_Handler     B       SWI_Handler
PAbt_Handler    B       PAbt_Handler
DAbt_Handler    B       DAbt_Handler
;IRQ_Handler     B       IRQ_Handler
FIQ_Handler     B       FIQ_Handler

&lt;br /&gt;

; Reset Handler

&lt;br /&gt;

                EXPORT  Reset_Handler
Reset_Handler
&lt;/pre&gt;

&lt;p&gt;
Please take a look and tell me the problum&lt;br /&gt;
Thanks for helping&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: LPC3250 IRQ_HANDLER HELP</title><link>https://community.arm.com/thread/144936?ContentTypeID=1</link><pubDate>Thu, 29 Jul 2010 01:08:58 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:cd851397-aaf8-471b-848d-79cab283caaf</guid><dc:creator>Non Keil Related</dc:creator><description>&lt;p&gt;&lt;p&gt;
The only change you need to make for IRQ_Handler is in the
startup, which you have done. I gave you code to initialise the
interrupt controller and timer.&lt;/p&gt;

&lt;p&gt;
If your project is very small, then maybe you should consider
posting more of the code so we can get a better idea about what
you&amp;#39;re doing (and what you might be doing wrong).&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: LPC3250 IRQ_HANDLER HELP</title><link>https://community.arm.com/thread/142678?ContentTypeID=1</link><pubDate>Thu, 29 Jul 2010 00:38:14 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:9da9a07c-980f-4d29-89a5-24ccaedf68ab</guid><dc:creator>eswar g</dc:creator><description>&lt;p&gt;&lt;p&gt;
I&amp;#39;m trying with this but i was unable to generate interrupt. &lt;b&gt;Is
there any changes have to made on .s file to enable
IRQ_Handler?&lt;/b&gt;&lt;br /&gt;
And i&amp;#39;m using Keil micro vision 3 compiler.&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: LPC3250 IRQ_HANDLER HELP</title><link>https://community.arm.com/thread/139651?ContentTypeID=1</link><pubDate>Wed, 28 Jul 2010 03:52:48 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:87a165df-cf46-4a5d-8ff9-7c58c2750a4a</guid><dc:creator>Non Keil Related</dc:creator><description>&lt;p&gt;&lt;p&gt;
The most important requirement of the ISR is to
release/acknowledge the interrupt so you can get another one; as:&lt;/p&gt;

&lt;pre&gt;
  T1IR = 1;  // Clear/Acknowledge the interrupt request
&lt;/pre&gt;

&lt;p&gt;
You can put anything else into the function that you want.&lt;/p&gt;

&lt;p&gt;
I can&amp;#39;t advise you on the use &lt;i&gt;send_data&lt;/i&gt; function nor your
use of &lt;i&gt;P2&lt;/i&gt; because that would be specific to your hardware and
code of your project.&lt;/p&gt;

&lt;p&gt;
It is typical on the LPC3250 to have a single interrupt entry
point that determines the source of the interrupt and calls (or jumps
to) the appropriate code, such as:&lt;/p&gt;

&lt;pre&gt;
void __irq IRQ_Handler(void)
{
  if ((MIC_SR&amp;amp;0x00020000)!=0)
  {
    Irq_Timer1();
  }
  else if (MIC_SR&amp;amp;0x00040000)!=0)
  {
    Irq_Other();
  }
}
&lt;/pre&gt;

&lt;p&gt;
&lt;i&gt;&amp;quot;Please tell me about this IRQ handler enable.&amp;quot;&lt;/i&gt;&lt;/p&gt;

&lt;p&gt;
I&amp;#39;ve given you some sample code and a reference to the relevant
section of the manual.&lt;/p&gt;

&lt;p&gt;
If you want other information, please be more precise.&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: LPC3250 IRQ_HANDLER HELP</title><link>https://community.arm.com/thread/136224?ContentTypeID=1</link><pubDate>Wed, 28 Jul 2010 02:55:09 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:b96251fb-5d31-4307-a82d-56f51efbe564</guid><dc:creator>eswar g</dc:creator><description>&lt;p&gt;&lt;p&gt;
Yes.i&amp;#39;m getting 5ms as per this values. But help me with
interrupt. i studied the data sheet. there is no support about &amp;quot;How
to use Interrupt Handler&amp;quot;. by following some examples and Datasheet i
written the below logic.&lt;/p&gt;

&lt;pre&gt;
void IRQ_Handler(void)__irq
{
send_data(&amp;#39;D&amp;#39;); // for uart5
P2_OUTP_CLR|=0x00001820; // checking for led glow

        if((MIC_SR&amp;amp;0x00020000)==0x00020000)
        {
        send_data(&amp;#39;C&amp;#39;);
          T1IR          |=0x01; // T1 Interrupt

          //timer1();

        }
        return;
}
&lt;/pre&gt;

&lt;p&gt;
&lt;br /&gt;
Is this correct?&lt;br /&gt;
If it is correct that &amp;#39;D&amp;#39; must be print on serial port.&lt;br /&gt;
Please tell me about this IRQ handler enable.&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: LPC3250 IRQ_HANDLER HELP</title><link>https://community.arm.com/thread/126302?ContentTypeID=1</link><pubDate>Wed, 28 Jul 2010 01:43:00 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:498e2401-87fd-4834-b806-3e28e5febae7</guid><dc:creator>Non Keil Related</dc:creator><description>&lt;p&gt;&lt;p&gt;
It would be sensible to initialise T1PR.&lt;/p&gt;

&lt;p&gt;
I do not know what effect there would be to setting MR1 to zero.
This register contains the match of count; i.e., the frequency of
interrupts.&lt;/p&gt;

&lt;p&gt;
If PCLK is set to (the typical) 13MHz, then the following would be
suitable for a periodic 5ms interrupt:&lt;/p&gt;

&lt;pre&gt;
  T1PR   = 1-1;             // PCLK/1

  T1MR0  = 65000-1;         // 5ms/(1/13MHz)
&lt;/pre&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: LPC3250 IRQ_HANDLER HELP</title><link>https://community.arm.com/thread/115931?ContentTypeID=1</link><pubDate>Wed, 28 Jul 2010 01:27:32 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:31757bee-f8c7-428b-91bf-5e7fb84cb3eb</guid><dc:creator>eswar g</dc:creator><description>&lt;p&gt;&lt;p&gt;
Yes,In User manual it is low. i changed the value now. but still
not getting interrupt.Please advice.&lt;br /&gt;
Thank you&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: LPC3250 IRQ_HANDLER HELP</title><link>https://community.arm.com/thread/104130?ContentTypeID=1</link><pubDate>Wed, 28 Jul 2010 01:06:41 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:7eb0cf33-e82b-4806-9af9-bc33f95d88dc</guid><dc:creator>Non Keil Related</dc:creator><description>&lt;p&gt;&lt;p&gt;
It says in the manual that the interrupt is active low.&lt;br /&gt;
This is why I included the line:&lt;/p&gt;

&lt;pre&gt;
MIC_APR &amp;amp;= ~(1&amp;lt;&amp;lt;17);     // Activation Polarity
&lt;/pre&gt;

&lt;p&gt;
or, in your form it would be:&lt;/p&gt;

&lt;pre&gt;
MIC_APR &amp;amp;= ~0x00020000;
&lt;/pre&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: LPC3250 IRQ_HANDLER HELP</title><link>https://community.arm.com/thread/78517?ContentTypeID=1</link><pubDate>Wed, 28 Jul 2010 00:53:47 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:942288b1-027d-4513-97ae-8f05e3bf1f48</guid><dc:creator>eswar g</dc:creator><description>&lt;p&gt;&lt;p&gt;
Thanks for reply.&lt;br /&gt;
This is the way i used in the program.&lt;br /&gt;
MIC_APR |= 0x00020000;&lt;br /&gt;
MIC_ATR &amp;amp;=~0x00020000; // Timer 1 Edge interrupt&lt;br /&gt;
MIC_ITR &amp;amp;=~0x00020000; // IRQ interrupt&lt;br /&gt;
MIC_ER |= 0x00020000;&lt;/p&gt;

&lt;p&gt;
we Tested timers without interrupt at match pins successfully.&lt;br /&gt;
Now, for the interrupt&lt;br /&gt;
Is my Procedure to enable the interrupts was right?&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: LPC3250 IRQ_HANDLER HELP</title><link>https://community.arm.com/thread/58483?ContentTypeID=1</link><pubDate>Wed, 28 Jul 2010 00:33:28 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:3447453c-8b35-4800-b6c3-f9dd5e0a87b4</guid><dc:creator>Non Keil Related</dc:creator><description>&lt;p&gt;&lt;p&gt;
You need to configure the interrupt controller.&lt;/p&gt;

&lt;p&gt;
Here&amp;#39;s a starting point for you:&lt;/p&gt;

&lt;pre&gt;
  MIC_APR &amp;amp;= ~(1&amp;lt;&amp;lt;17);     // Activation Polarity
  MIC_ATR &amp;amp;= ~(1&amp;lt;&amp;lt;17);     // Activation Type
  MIC_ITR &amp;amp;= ~(1&amp;lt;&amp;lt;17);     // Interrupt Type (IRQ)
  MIC_ER  |=  (1&amp;lt;&amp;lt;17);     // Enable register
&lt;/pre&gt;

&lt;p&gt;
Refer to chapter 5 of the LPC3250 user manual for further
details.&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item></channel></rss>