Do you have any other suggestions, how to get the "keypad read" over i2c to run.

Best Regards

the only thing that does not work is reading from the keypad over i2c.
My i2c Interface works fine with other devices, such as the Philips PCF8574AP (i2c I/O Expander). With this chip it is possible to read data from porst and write data to porsts.

greeting
Michael

Hi,

the debounce time is set to "20". I set this value at Display Tuner.
This debounce time works fine if the keypad is polled over RS232 within the Display Tuner application.

At i2c mode i get the same results than before.

Best Regards
Michael

the Speep(1500); command is only for delaying and does not disturb i2c communication.
I added also the "auto repeat off" [0xfe] [0x60] command to my code. But i get the same results than before.

greeting
Michael

#define LK202_I2CADDR 0x50
//init_i2c..
//AutoTransmitKey off..

{//loop

==============================
//My Poll command
char cmd[] = {0xFE, 0x26};
i2c_write(LK202_I2CADDR, cmd, 2);
===========================
..
..
//Read Data
//print Data
}



Best Regards
Michael

PS: It's non differentiated ...

My test programm has follow operational sequence.

snippets of my programm

#define LK202_I2CADDR 0x50

//init
i2c_init();

//set AutoTransmitKey to off
char cmd[2] = {0xFE, 0x4F};
//generate start condition, send data, generate stop condition
i2c_write(LK202_I2CADDR, cmd, 2);

//Data buffer
char ...

the problem is:
I press different Buttons at the keypad and get at determined keys the same data back from module.
see above

////key 2 pressed
//data = 0x21

////key 3 pressed
//data = 0x21 //it is the same as key 2

a push to key 2 or key 3 deliver the same data (I can not differ in my ...

Hi,

i have a peck of trouble to get the correct Data over i2c which i read from keypad at LK202-25.

I atteched a 3x4 matrix Keypad to LK202-25. I tested the keypad with the Display Tuner and all works fine. After the first test was ok. I tried to writing and reading to the LK202-25 over i2c ...