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/jzs3_ da65/C3088.pdf http://ltc.cit.cornell.edu/courses/ee476/FinalProjects/s2006/jzs3_da65/jzs3_ 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. _______________________________________________ http://www.opencores.org/mailman/listinfo/cores _______________________________________________ http://www.opencores.org/mailman/listinfo/cores

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

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 (

da65/C3088.pdf

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-

Sent from the OpenCores - IP Cores mailing list archive at Nabble.com. _______________________________________________ http://www.opencores.org/mailman/listinfo/cores

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 Herveillerichard at h...> To: Date: Thu May 29 14:47:49 CEST 2008 Subject: [oc] I2c and Avalon Bus
attached
http://ltc.cit.cornell.edu/courses/ee476/FinalProjects/s2006/jzs3_da65/j zs3_ http://ltc.cit.cornell.edu/courses/ee476/FinalProjects/s2006/jzs3_da65/j zs3_
tp17530366p17530366.html
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