Re: I2c and Avalon Bus

jonathan.butzine wrote:

Before using the oscilloscope, you may want to use signal tap to
determine if your signals (SCL, SDA) look correct coming out of your
SOPC builder system.
Then check your signal hook up from your SOPC Builder system to the
pins.  You need to hook up the SDA signal directly from SOPC Builder to
the pin because SDA is a bidirectional line and the tri-state handling is
done in the core.

----- Original Message -----
From: Richard Herveille<richard@h...>
To:
Date: Thu May 29 14:47:49 CEST 2008
Subject: [oc] I2c and Avalon Bus

> Can you hook up an oscilloscope and see any activity on SCL/SDA??
>
> Richard
>
> -----Original Message-----
> From: cores-bounces at opencores.org [mailto:cores-bounces at
> opencores.org] On
> Behalf Of K at nt
> Sent: 29 May 2008 10:53
> To: cores at opencores.org
> Subject: [oc] I2c and Avalon Bus
> Hello all,
> I'm currently working on opencores I2C master (VHDL version) to
> the NIOS 2 processor via the Avalon bus.(Stratix II)
> There is an older post about this subject but I can't resolved my
> problem.
> So I've used i2c_master_top_avalon.vhd and I've created a wrapper
> to use
> this component with Avalon bus
> http://www.nabble.com/file/p17530366/oc_i2c_master.vhd 
> oc_i2c_master.vhd
> I've configured the component(
> http://www.nabble.com/file/p17530366/component.jpg ) and
attached
> this to a
> NIOS 2 processor.( http://www.nabble.com/file/p17530366/sopc.jpg )
> I've assigned Sda ans Scl
> http://www.nabble.com/file/p17530366/pin.jpg 
> So I use I2c to configure a video camera (
>
>
http://ltc.cit.cornell.edu/courses/ee476/FinalProjects/s2006/jzs3_da65/j
zs3_
> da65/C3088.pdf
>
>
http://ltc.cit.cornell.edu/courses/ee476/FinalProjects/s2006/jzs3_da65/j
zs3_
> da65/C3088.pdf
> ) but i can't set this !!
> I think the problem is it can't recognize the slave (video camera),
> in fact
> when I write a value into the register of the video camera I'm
> waiting for
> the TIP flag and RxACK flag but the RXACK always stay at '1'...
> At start I've thought there was a problem with the slave adress but
> i've
> tested all the values between 0 and 255 with no success !!!
> An exemple of my code to write into slave's register :
> // address : address of the slave
> // reg : address of the slave's register
> // data : value wich write in the slave's register
> void i2c_write(unsigned char address, unsigned char reg, unsigned
> char data)
> {
>
> // write address
>  IOWR_I2C_TXR(address);
>  IOWR_I2C_CR(OC_I2C_STA | OC_I2C_WR | OC_I2C_ACK );
>  i2c_wait_tip();
>  i2c_rxack();
>
>  // write register address
>  IOWR_I2C_TXR(reg);
>  IOWR_I2C_CR(OC_I2C_STA | OC_I2C_WR | OC_I2C_ACK);
>  i2c_wait_tip();
>  i2c_rxack();
>  // write data
>  IOWR_I2C_TXR(data);
>  IOWR_I2C_CR(OC_I2C_WR | OC_I2C_STO);
>  i2c_wait_tip();
>  i2c_rxack();
> }
> void i2c_rxack(void){
>  while ((IORD_I2C_SR & OC_I2C_RXACK)> 0 ) {}
>  }
> I've initialized CTR (0x80) before write into slave's register
> Can I have some help, please ?
> Thank you very much
> Regards
> --
> View this message in context:
> http://www.nabble.com/I2c-and-Avalon-Bus-
tp17530366p17530366.html
> Sent from the OpenCores - IP Cores mailing list archive at
> Nabble.com.
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>
>
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