OPENCORES.ORG

Hallo Guido,

Hi,
I tried to use this I2C core(the VHDL version) in a NIOS2 system with 
quartus 2(4.1) I connected everything like stated below, but I get no 
response from it when I write to a register. 
I did not connect the other end of the I2C chanel because I want to 
make sure it was connected properly. Could that be the problem?

I used the following commands to try to send something:
[code]
IOWR_8DIRECT(I2C_BASE,OC_I2C_CR,IORD_8DIRECT(I2C_BASE, 
OC_I2C_CR)|OC_I2C_EN); //chip enable
 IOWR_8DIRECT(I2C_BASE,OC_I2C_PRER_LO,0x50);//set prescaler
 IOWR_8DIRECT(I2C_BASE,OC_I2C_PRER_HI,0x00);
 IOWR_8DIRECT(I2C_BASE,OC_I2C_TXR,0xAC);// set write adres
 IOWR_8DIRECT(I2C_BASE,OC_I2C_SR,(IORD_8DIRECT
(I2C_BASE,OC_I2C_SR)|OC_I2C_STA|OC_I2C_WR));//set some other bits
 printf("%x\n",IORD_8DIRECT(I2C_BASE,OC_I2C_SR));// check (i get 
FF!?)
 while(IORD_8DIRECT(I2C_BASE,OC_I2C_SR)& OC_I2C_TIP);
 printf("%x\n",IORD_8DIRECT(I2C_BASE,OC_I2C_SR));
 IOWR_8DIRECT(I2C_BASE,OC_I2C_TXR,0x5C);
 printf("%x\n",IORD_8DIRECT(I2C_BASE,OC_I2C_SR));
 IOWR_8DIRECT(I2C_BASE,OC_I2C_SR,(IORD_8DIRECT
(I2C_BASE,OC_I2C_SR)|OC_I2C_STO|OC_I2C_WR));
[/code]

Hope someone can help,
David

----- Original Message ----- 
From: c.scherp@3...<c.scherp@3...> 
To: 
Date: Thu Apr 15 16:20:50 CEST 2004 
Subject: [oc] I2C ip core integration for ALTERA FPGAs 

> Hallo Guido, 
> 
> it works ! Thank you very much for helping me ! 
> 
> Christian. 
> 
> Datum: 	Fri, 2 Apr 2004 14:22:33 +0200 
> Von: 	"Guido Kuhlmann" 
> <Guido.Kuhlmann@t...> 
> Betreff: 	RE: [oc] I2C ip core integration for 
> ALTERA FPGAs 
> An: 	"'Discussion list about free open source IP 
> cores'" <cores@o...> 
> Antwort an: 	Guido.Kuhlmann@t..., 
>  	Discussion list about free open source IP 
> cores <cores@o...> 
> [ Doppelklick auf diese Zeile zeigt Optionen für Abo-Liste ] 
> Hi Christian, 
> you can easily connect the I2C Wishbone core to the NIOS 
> processor (I don't know 
> the simple I2C core). 
> 1. Within SOPC builder, generate interface to user logic. 
> 2. Select bus interface type: avalon register slave. 
> 3. Add "i2c_master_top.v" design file. 
> 4. Read port list from file. 
> 5. Connect the signals as follow: 
>  wb_adr_i <=> address 
>  wb_dat_i <=> writedata 
>  wb_dat_o <=> readdata 
>  wb_we_i <=> write 
>  wb_stb_i <=> chipselect 
>  wb_cyc_i <=> chipselect 
>  wb_inta_o <=> irq 
>  wb_clk_i <=> clk 
>  wb_ack_o <=> waitrequest_n 
>  wb_rst_i <=> always0 
>  arst_i <=> reset_n 
>  scl_pad_i <=> export 
>  scl_pad_o <=> export 
>  scl_padoen_o <=> export 
>  sda_pad_i <=> export 
>  sda_pad_o <=> export 
>  sda_padoen_o <=> export 
> 6. Under timing tab, leave the setup, wait and hold settings at 0 
> cycles. 
> You can now access the I2C core via included 
> "oc_i2c_master.h". 
> Hope this helps. 
> Guido. 
> ______________________________________________________ 
> _______ 
>  Guido Kuhlmann 
>  Tigris Elektronik GmbH http://www.tigris.de 
> ______________________________________________________ 
> _______ 
> > -----Original Message----- 
> > From: cores-bounces@o... 
> > [mailto:cores-bounces@o...]On 
> > Behalf Of c.scherp@3... 
> > Sent: Wednesday, March 31, 2004 10:31 AM 
> > To: cores@o... 
> > Subject: [oc] I2C ip core integration for ALTERA FPGAs 
> > 
> > 
> > 
> > I´m new to opencores.org and I want to integrate a simple 
> I2C 
> > Bus Master Interface 
> > in an ALTERA Apex / Cyclone / Stratix Device with QuartusII 
> > and SOPC Builder. I do 
> > not need the complex wishbone version of the I2C core. 
> I´m 
> > happy with the simple 
> > I2C Bus Master which can be found in I2C.vhd. Is there any 
> > documentation available 
> > for this version ? Or can anyone give some advice how to 
> > connect this core to the 
> > ALTERA Avalon Bus and the ALTERA Nios Soft-Processor ? Thank 
> you... 
> > Christian. 
> > 
> > 
> > 
> > _______________________________________________ 
> > http://www.opencores.org/mailman/listinfo/cores 
> > 
> _______________________________________________ 
> http://www.opencores.org/mailman/listinfo/cores 
> -- 
> 3D Alliance GmbH 
> Hauptstr. 46 
> 35649 Bischoffen 
> Tel. 06444 / 93 19 - 0 Fax. 06444 / 93 19 - 12 
> 