2009-11-12 07:40:09 i2c problem
Daniele Pagani (ITALY)
Message: 82312
Dear sirs,
I've a BF537 custom board, with uClinux 2009R1-RC6.
The board has a Atmel AT24C1024B Two-wire serial eeprom.
I enable the I2C and then I develop a small application in order to test the situation.
The application is i2c.c
Then, I know that in address 2048 I've a byte with value 0x00.
Typically I read the right value, but in some situation the value is 0xFF.
So, I've connected the oscilloscope and I see a strange situation.
When I read 0xFF, I see that Blackfin sends only two bytes and not three bytes.
I've no error from functions ioctl, write and read.
What could be the reason? How can I solve the problem?
Best regards,
Daniele.
(In attach:
- i2c.c test application
- wrong.jpg, right.jpg images from oscilloscope
- show.txt serial port terminal interface
)
right.JPG
wrong.jpg
i2c.c
show.txt
i2c-dev.h
