[SOLVED] I2C-Hardware problem

[sundar11]

Only two arm7 devices are available in the bus. is we can isolate the controllers. i am checking that..

 

[shruv]

Hi shruv

Thanks for your help.. i gone through the code, its really useful.. in slave what states are you checking, i am checking 0x60 and 0x80. any suggestions..

I've checked for 0x70 & 0x90 states,the slave addr is 0x00 (general call address).

 

[sundar11]

HI shruv
is it not possible to assign a particular address to a microcontroller, whether i need to use the general call bit.

 

[sundar11]

Hi shruv
I tried your code from word press.com, it worked well but the slave did'nt receive the data in the state 0x90. it enters the state only one time but the value displayed is 0.. i verified in both Proteus and hardware output. the problem repeats. i have attached the slave c file with this, any ideas,suggestions would be helpful to me

#include <lpc214x.h>
#include "type.h"
#include "LCD_16x2.h"


void I2C_Inti(void);
__irq void I2C_ISR(void);
int c,i;
char k;
char buf[8];
int  main()
{
  LCD_Init();
  PINSEL0&=0xFFFFFF0F;
  PINSEL0|=0x00000050;// using i2c0
  VICVectCntl0 = 0x20 | 9; 
  VICIntEnable |= (1<<9);
  VICVectAddr0 = (unsigned long)I2C_ISR; 

 
	I2C_Inti();

	Display_String("slave");
	LCD_Command(0x80);

	
}
void I2C_Inti(void)
{
	I2C0ADR=0x01;
 I2C0CONCLR= 0xff;
 I2C0CONSET=0x40;
	I2C0CONSET=0x04;
 
	
}

__irq void I2C_ISR()
{
switch(I2C0STAT)
       {
           case 0x70 : Display_String("g");  
                              I2C0CONSET|=0x04;  //AA bit set
                              I2C0CONCLR=0x08;
                              break;
           case 0x90 :
						 for(i=0; i<9; i++)
					 {
						 Display_String("r");
						 buf[i]=I2C0DAT;  //data received and stored safely
					 }                  Display_Decimal(buf[i]);
				                      I2C0CONCLR=0x08;
                             
                             break;
           case 0xa0 :Display_String("p");
                             I2C0CONCLR=0x08;
                             break;
           default:Display_String("n");
                       I2C0CONCLR=0x08;
                       break;
}

VICVectAddr=0x00;
}

Thanks for your attention

Regards

sundar

 

[jaga123]

hi 2 all,

Proteus is not always show the correct hardware effect , your hardware is not correct than it also possible that you may have correct program but output will not be correct. check for device address , and use proper clock signal to read and acknowledge the data.

what you are trying to do (read or write operation)?

 

[sundar11]

Hi jaga

i am going to write data to the slave. i use general call address 0x00.


regards
Sundar

 

[jaga123]

hi sundar

i have not worked with lpc 2148 till now. but i think u should go through application not be the.pdf of this device. may be that will help you out.

for detail
1.https://www.esacademy.com/en/librar...duction/special-addresses-and-exceptions.html
hope it will help u

 

[sundar11]

Hi jaga
I found your information useful and i have got output for i2c transferring data at 25khz,. Thanks to all who helped me out ..


Regards

Sundar

 

[jaga123]

HI sundar,

congratulation.
hopefully what is the problem u found?
share it .

thank you .

 

[sundar11]

Hi jaga123

Clock speed is main issue it worked in 25khz but not in 100 khz, need to make it work for 100 khz

Regards

Sundar

 

[jaga123]

ok good.
thank you.
if you have any further i2c problem . than share it.

 

[sundar11]

Hi everyone
I am facing problems while working in lpc2148 i2c slave transmitter mode, data is not transmitted from the slave to the master. i had successfully transmitted data from the master to the slave, but facing problems in this, any ideas would be helpful. i am using interrupts , no problems with hardware since i transmitted data from master to the slave using the same hardware setup.


Regards

Sundar

 

[shruv]

HI shruv
is it not possible to assign a particular address to a microcontroller, whether i need to use the general call bit.

I am not sure if one can assign an another address,haven't looked into that.