Re-Post on INT

Hi Samjith Wasim,

Please do NOT create new thread everytime when you just want to reply/update to your identical question/problem.

If you create new thread everytime, then we are not able to know your progress correctly and not able to check you code easily.

According to your another thread:

Your Code:

void main(void)
{

        PCONP |= 0x00080000;

        PINSEL1 |= 0x000003C0;  /* Setting Pin Selection for I2C1 */

        I21SCLL   = 60;         /* Speed at 100Khz  */
        I21SCLH   = 60;


        VICIntEnClr |= (1<<19);
        VICVectPriority19 = 1;
        VICVectAddr19 = (unsigned long)I2C_IRQHandler;
        VICIntEnable |= (1<<19);


 while(1)
  {

        I21CONSET = 0x00000040;  /* Setting I2Enable bit   */
        I21CONSET = 0x00000020;  /* Setting Start Bit */

       if(Message == 1)
       {
          LcdDisplay("Message is 1");
       }

      and so on....till Message == 23..
  }

If the above code remains your main() function, then [you can not get the data you want in main() function] is due to [ISR runs very quickly, when ISR finishs its work, main() has not started to work].

Hi Samjith Wasim,

Please do NOT create new thread everytime when you just want to reply/update to your identical question/problem.

If you create new thread everytime, then we are not able to know your progress correctly and not able to check you code easily.

According to your another thread:

Your Code:

void main(void)
{

        PCONP |= 0x00080000;

        PINSEL1 |= 0x000003C0;  /* Setting Pin Selection for I2C1 */

        I21SCLL   = 60;         /* Speed at 100Khz  */
        I21SCLH   = 60;


        VICIntEnClr |= (1<<19);
        VICVectPriority19 = 1;
        VICVectAddr19 = (unsigned long)I2C_IRQHandler;
        VICIntEnable |= (1<<19);


 while(1)
  {

        I21CONSET = 0x00000040;  /* Setting I2Enable bit   */
        I21CONSET = 0x00000020;  /* Setting Start Bit */

       if(Message == 1)
       {
          LcdDisplay("Message is 1");
       }

      and so on....till Message == 23..
  }

If the above code remains your main() function, then [you can not get the data you want in main() function] is due to [ISR runs very quickly, when ISR finishs its work, main() has not started to work].

i2c.h

#define I2CONCLR_AAC            0x00000004
#define I2CONCLR_SIC            0x00000008
#define I2CONCLR_STAC           0x00000020
#define I2CONCLR_I2ENC          0x00000040

i2c.c

I20CONCLR = (I2CONCLR_SIC | I2CONCLR_STAC);

Use the above coding style, your code would be easier to read and understand.

Please read the LPC23XX User manual, Chapter 21: LPC23XX I2C interfaces I2C0/1/2, 6.2 Master Receiver mode, Fig 105. Format of Master Receive mode.

And make sure that your code follows the I2C Master Receive standard.

For example, before you send STOP, you should send [Not acknowledge] first.

If you don't 100% follow the I2C standard, your code may work, with some strange behaviors.

Hello linq ,

Like you told I have declared the global variable as "volatile" and followed setting up the NACK bit before setting the stop bit like this ,

case 0x50:

MasterBuff[Index] = I21DAT ;

if(Index != READ_SIZE)
{

 I21CONSET = SET_ACK_BIT;
 Index++;

}

else
{
  Index = 0;
  I21CONCLR = SEND_NACK_BIT;
  I21CONCLR = STOP_BIT;
  I21CONCLR = CLEAR_INTERRUPT_BIT;

}

but still I am not able to get the desired result .

Looking forward,

Sam

1. Please provide the source code of your main().

2. Please re-read the manual, re-write your code.

3. Please trace your code step by step.

I have used the Debugging tool and simulated it to see I2C interrupt ; all the status are getting updated , it is entering into case 0x50 . This is my main ,

void main()
{
  I2C_init();

   while(True)

  {

    I2C_SET_START_BIT ;

  }

}

I have used the Debugging tool and simulated it to see I2C interrupt ; all the status are getting updated , it is entering into case 0x50 . This is my main ,

void main()
{
  I2C_init();

   while(True)

  {

    I2C_SET_START_BIT ;

    if(MasterBuffer[0] == 1)
     Disp (1);

    else if (MasterBuffer[1] == 2)
     Disp (2);

    Similarly upto MasterBuffer[23]...

  }

}

What is the result you expect?

What is the result you get?

What is "I2C_SET_START_BIT"?

What is "Disp (x)"?

Is Salihu Aliyu your classmate?

Hey Linq ,

Surprisingly , when I checked under case 0x50 I came to know even after exceeding my Read Index my ACK bit was set,When I cleared that bit once for all , I couldn't beleive myself that I got the desired result .

Sir about Salihu Aliyu , Could i Know whose that person ???

Thanks for all your Inputs and support Linq ,

Regards,
Samjith.

but his name is John, not Linq...

Hi Samjith Wasim,

You still need to:

1. Please re-read the manual, re-write your code.

2. Please trace your code step by step.

I believe that, there are some other bugs in your code.

Hey John ,

Since the application which I am working on is a real-time appn . I modified the code as told by you and checked for all the test cases , its working fine ...

Thanks for your Support !!!

Regards,
Samjith