I2C beaglesboard xm linux

Phi Nguyen

Hi,

I'm using the Beaglesboard-xm to develop a LCD (model NHD-C0216CiZ-FSW-FBW-3V3) driver which requires the I2C write as the following sequence:

void init_LCD()

{

I2C_Start()

I2C_out(0x7C) //slave address

I2C_out(0x00) //data/command

I2C_out(0x38) //data/command

delay(10); //delay 10ms

I2C_out(0x14) //data/command

delay(10);

I2C_Stop();

}

What I need is how to configure the I2C to send out "start address ... data ... delay ..... data ... stop"

the Start and Stop condition can be called when needed.

I got the I2C linux driver to work with other devices but not with this LCD because it needs special sequence.

Can someone please help me on this?

Regards,

Phi

over 12 years ago

0 Gina Glaser over 12 years ago

TI__Expert 8055 points

Phi,

I am moving this post to the OMAP3 forum, but ultimately you may need to ask this through the Beagleboard discussion forums: http://beagleboard.org/discuss

Regards,
Gina

0 Phi Nguyen over 12 years ago in reply to Gina Glaser

Prodigy 20 points

Thank you Gina,

I hope that I can get the answer from this forum.

0 Renjith Thomas over 12 years ago in reply to Phi Nguyen

Guru 31670 points

Phi,

Other than hacking the I2C driver for inserting the delay asynchronously will be tough to achieve in Linux. But have you explored the option of group the transfer before the delay and stop the transfer. The remaining portion you can issue as another transfer again. Since the objective of all the transfers is to write into a register or change the state of the device, I guess it should work without any issue.

http://www.newhavendisplay.com/app_notes/ST7032.pdf

To do this, I guess you might have modify the MSB bit of the control byte to indicate a stop according to the spec.

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I2C beaglesboard xm linux