[ARM] I2C -lpc2148 isr problem

[Sundar Raju]

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void I2C_Initi(void);
__irq void I2C_ISR(void);
void ISR_8(void);
void ISR_18(void);
void ISR_10(void);
void ISR_28(void);
 
 
int i,Temp,f;
 
 
 
int main()
{
PINSEL0&=0xFFFFFF0F;
PINSEL0|=0x00000050;// using i2c0
I2C_Initi();
I2C0CONSET|=0x20;/* Send start bit */
 
while(1)
{
IOCLR0=0x40;
IOSET0=0x40; //post indicators
 
}
}
 
void I2C_Initi(void)
{
    
    
I2C0CONCLR=0X6C;   
I2C0CONSET=0X40;   
 
I2C0SCLH= 0x01;
I2C0SCLL= 0x90;
 
VICVectCntl0 = 0x20 | 9; 
VICIntEnable |= (1<<9);
VICVectAddr0 = (unsigned long)I2C_ISR; 
 
}
 
__irq void I2C_ISR()
{
      
  Temp=I2C0STAT;                    
switch(Temp)
{
case 0x08:
ISR_8();
break;
case 0x18:
ISR_18();
break;  
case 0x28:
ISR_28();
break;
}
 
VICVectAddr = 0xff;
 
}
  
void ISR_8(void)
{
    
I2C0DAT=0x60;              //slave address//
I2C0CONSET=0x04;
I2C0CONCLR=0x08;      
}   
 
void ISR_18(void)
{ 
        I2C0DAT=0x32 ; // sample data
    I2C0CONSET=0X04;    
      I2C0CONCLR=0x08;
}
 
 
void ISR_28(void)
{
    I2C0DAT=0x24 ;   // next data
    I2C0CONSET=0X04;    
    I2C0CONCLR=0x08;
    
}

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i am using two lpc2148. one as master and other as slave. afterthe address acknowldgement form the slave. no data has been send.

any suggestions

 

[cl10greg]

Have you debugged your code to see if it runs all the way through and to make sure it doesn't get stuck? Did you check your registers to make sure that it doesn't get overwritten or an overflow errors?

 

[shruv]

Check out what's the status the master is returning after you try to send data.That will help you debug your code.

 

[shruv]

https://embeddedalltheway.wordpress.com/

Check out the given link. I've done the same thing and posted the code there. Let me know if you have any doubts.

 

[Sundar Raju]

HI shruv

Thanks for replying...

I visited the link, its really useful... i have configured master as mentioned in that, i am having problems in slave side , my slave configuration as follows

first i have enabled the I2EN bit and AA bit , while checking the states it waits in state 0x60. after that it does not progress any ideas would be helpful.


Regards

raj

 

[embpic]

Post the schematic and code

 

[shruv]

HI shruv

Thanks for replying...

I visited the link, its really useful... i have configured master as mentioned in that, i am having problems in slave side , my slave configuration as follows

first i have enabled the I2EN bit and AA bit , while checking the states it waits in state 0x60. after that it does not progress any ideas would be helpful.


Regards

raj

Could you tell me why have you selected slave receiver mode? and can you also post the code?