Omnivision OV7640 SCCB (I2C?) bus problem
I am hoping someone can assist me with the SCCB (I2C?) bus of an
Omnivision OV7640 image sensor.
I am unable to get the OV7640 to respond to commands on the SCCB bus.
I have connected the OV7640 to a SRAM, and feed VSYNC and HREF to an
Altera 7032S CPLD which controls and address counter and the SRAM. I
can successfully capture an image frame, and transfer it (slowly) over
RS232 to a PC.
If I treat each pixel as a luminance value, I get a good monochrome
photograph, 640 x 480.
I find this surprising, since I was expecting bayer encoded data.
Looking at (on the data...SES-2 over I2C == multimaster I2C?
while investigating the theoretical background of some recent
SuperMicro SAS backplanes with the AMI MG9072 enclosure management
processor, I've ended up with the following unanswered question:
it would seem that "enclosure management over I2C", as specified in the
SATA 2.5 spec, implies the use of multi-master I2C. The host PC or the
RAID controller effectively sends a SCSI command encapsulated in I2C to
the enclosure backplane processor (I2C write transaction), then the
backplane processor and the host machine switch roles on the I2C bus,
and the backp...I2C
i am working with philips microcontroller LPC935 which is to be
attached to I2C port expander.
i have to write a code for this .As my device is configured as master
receiver to read (i have to read only) the value or status of port
my question is that : Do i need to check for all 25 states of I2C bus
from status register for my operation ?
> i am working with philips microcontroller LPC935 which is to be
> attached to I2C port expander.
> i have to write a code for this .As my device is configured as master
> receiver to read (i have to read onl...I2C high speed mode and I2C range extending
Hi - are there any microcontrollers out there that support I2C high
speed mode? (3.4Mbps - defined in the I=B2C-bus specification, Version
2=2E0). I can't find any that do. I can't even find any NXP parts that
Also - has anybody ever used an I2C bus extender chip? (ie the NXP
P82B715). What was your experience with it? Are there any that can
handle higher speeds that that one? (1Mbps+)
> Hi - are there any microcontrollers out there that support I2C high
> speed mode? (3.4Mbps - defined in the I�C-bus specification, Version
> 2.0). I ca...Devantech USB-I2C R286-USB-I2C board
I bought the Devantech USB-I2C R286-USB-I2C board. The Devantech USB-
I2C module is a low cost USB to I2C module, with a simple command set,
and interfacing to any I2C device. I'm trying to set the I2C interface
between my I2C board and R286-USB-I2C?
Also I do need a help in User Interface development for Microsoft
Windows. It should be similar to your USB_I2C_SRF08.exe software but
Thanks in advanced for any help,
...I2C read write error in I2C User application
I have a I2C based touch screen driver TSC2003 which i obtained
from open source.
I added the driver to kernel (2.6.10)tree and I2C communication in
hard ware is ok.
After booting the system i didnt find any device entry.
I manually created the device entry by
mknod i2c-0 -c 89 0
I am writing an application in which i am polling the I2C device
for reading X anf Y position.
The application source is as follows
int addr = 0x48;
#define I2C_SLA...How to forward IOCTL's from i2c-dev.c to adapter driver (i2c-rt3352.c)
I'm writing the I2C adapter driver for SOC. This adapter exist now in
system and RTC driver works with it via .master_xfer.
I would like to send IOCTL's from application via /dev/i2c. I have
loaded i2c_dev and all modules. After sending IOCTL I get following :
#i2ccmd read 0
ioctl, cmd=0x03, arg=0x00
i2cdev_ioctl method doesn't send I2C_RDWR IOCT'L to my adapter driver.
How can I forward those IOCTL's to i2c-rt3352.c ...I2C EEPROM
I am trying to read a byte from a particular address in I2C EEPROM.
But the data I get is from a different location. For example, if try
to read data from "x05" location, the byte from "x0B" location is
read. If try to read data from "x06" location, data from "x0D" is
read. If I try to read data from "x07", data from "x0F" is read. If
you notice above situation, a fixed pattern is followed.
I am using a I2C Master Core controller to read data from I2C EEPROM.
Xilinx Post route simulation works fine but when I try to configure
th...i2c and compilers
** I have been working on libero with the i2c programme, it is
compiling without any error but no output.
** so i changed to other compiler hdlworks worked on it which i got a
free code again same effect.
** Can anyone suggest me how to tackle this programme, is the state
machine depends on the compiler?
** if anyone can suggest any code for libero with i2c it will be great
i want to know that i2c addressing scheme for page write
fashion how will it be.
i mean what will be
it is described in the datasheet of the device you are using
...having problems with i2c
hello you all
i've been working on an i2c communication among a unique master and
several slaves (all of them pic16f877) but a problem arose when trying
to send data from slaves to the master:
when working with a slave as transmitter, after setting sspcon2.RCEN,
the SDA line is supposed to get the value of the most significant bit
contained in SSPBUF and then shifting out the next bits with the
falling edges of the SCL line (so that the second bit of the byte to
be transmitted is shifted out with the falling edge of the first
clock pulse, the third bit with the second falling edge... ...i2c Bus
hallo all ,
i am a beginner in vhdl , i need help .
i just want to ask with VHDL code wether the i2c Bus is free.
bus is free when a stop condition is sent und known start condition is sent
this is a start condition
this is a stop condition
please help me .
I think what you are asking for is a falling edge detector and a rising
SIGNAL sda1, sda2, falling_edge, rising_edge : std_logic;
WAIT until clk=...I2C slave
I've written a I2C slave core:
It should work with 100 kB and 400 kB master devices and it supports
sending and receiving multiple bytes and the repeated start condition.
Stretching clock cycles is not supported, the host which uses the core must
be fast enough.
Currently I've tested it in a simulator, only, maybe someone could test it
on real hardware, e.g. with the included testdevice and a hardware master,
like built-in in some microcontrollers.
I'm not sure about the communication concept: Currently it doesn't use
handshak...I2C on TMS320C5510
I am looking to use the AIC31 codec with a TMS320C5510 and I have not
found much good info at ti.com on how to do this. Seems the 5510 is
the only member of the family without an I2C port built in.
I was looking at bit banging the GPIO port to do this and I am not sure
you can make the port act like an open collector output. The data
sheet says the data register is for reading the input when in input
mode or you can write to it for the output mode. It is not clear if
you can write a 0 to the output register when still in input mode. If
not, it may be in the 1 state when the mode is set to...On I2C protocol
As for the I2C Master, assuming no clock stretching
is issued by the Slave, here is a common situation and
its concerning counterparts.
1) Start - b1 - b2 - Stop
And relative CONCERNING scenarios:
2) Start - b1 - DELAY - b2 - Stop
3) Start - b1 - b2 - DELAY - Stop
(and why not) Start - DELAY - b1 - b2 - Stop
b1 is a completely transferred and acked byte
b2 as above
DELAY is at least, more than a single SCL period.
The difference between 1 and 2, 3 is the DELAY.
Is such a delay allowed? If it is, which is the
polarity of SCL when the master is (let's say)
I want to learn 'how to program an I2C device' . I am trying to find
a simulator for an I2C device which I can use to test any sample
programs I get from the web. When I search the web for a simulator I
get a lot of VLSI related results. Is there a free I2C device
simulator software for learning I2C programming.
Thank in advance.
> I want to learn 'how to program an I2C device' . I am trying to find
> a simulator for an I2C device which I can use to test any sample
> programs I get from the web. When I search the web for a simulator I
> get ...I2C control.
On my understanding, and the function call that chip supplier provides
ABC_IICWrite(1, 0x1A); // write 0x1a to register 1.
It seems that:
1. I2C device can't support more then 255 registers. ( due to only 1
byte for register assigment. )
2. I2C device only accept 1 byte data a time. ( it is my guess only,
due to the function call accepts 1 byte only and that is not a pointer
am I right?
I2c specifications from Philips!
"Boki" <firstname.lastname@example.org...Multiple I2C
I have 2 separate I2C chain with 8 identical IC in each ones. Is it possible to drive both with same NI USB-8451 - of course with some switches, let say CMOS Analog Multiplexer. I can use IO port on NI USB-8451 to drive Mux, but how to avoid timing problem. With other words how to achieve that IO command wait until I2C Read or Write is ended (without extensive Wait in LabView execution).
I haven?t yet NI USB-8451 so I can?t test and must to know how to solve that problem before buy hardware.
Our I2C Box can serve 8 identical devices, for example EEPROMS because the addres...Problem with I2C
I'm trying to interface a Toshiba 16bit MCU with another IC(call this
IC2), with the MCU being a slave transmitter. The IC2 expects a slave
EEPROM at a certain address, and I've setup the MCU to be at this
address. The problem is that the MCU isn't interrupting or
acknowledging the signals all the time. I've looked at the SDA/SCL
waveforms and while IC2 is sending the first device address(with wr
direction), the MCU doesn't ACK the address, even though it does
interrupt at the end of the address. IC2 hence immediately sends the
device address again, and only this time ...i2c interface
I have a code for transferring the data serially to SDA line as:
if(SCL'event and SCL='0') then
data_register<=data_register(6 downto 0) & '0';
in above code, i wan...I2C Extended
Hello Wire Workers,
Can anyone enlighten me how to use more than 8 addresses (MAX 500 addresses) in NI USB 8451?
Does USB 8451 support 10 bit addressing (I2C Extended)?
In other words can I monitor 500 I2C compatible devices through NI USB 8451?
After reaging the docs, I am still a bit confused about terminology
used by lm-sensors team.
I have to implement i2c driver for my specific hardware, that is based
on ARM926EJ and AMBA bus. As I can see, there is not support for I2C
interface that sits on AMBA bus (APB part of AMBA) adn is on the othae
side connected to peripherals via I2C bus. So, that interface, called
ApI2c, is bridge between I2C and AMBA bus. I have to write driver to
describe it, so I am confused what files to look.
1) Is this what I described an "adapter" (in i2c terminology)?
2) Where should new .c f...i2c opencores
has anybody successfully used this core? What I need to do seems to me
really really simple: configure a couple of settings of a transceiver
(operation frequency, transmitting mode, etc.). I was asked to do this
with a i2c bus.
I'm stuck creating the test bench just to do some read/write test. Has
anybody a simple testbench example?
If you have a copy of Circuit Cellar
Control an FPGA with I2C, by Roberto Ferrabone, p. 60
There is a good I2C test bench written in VHDL. This article also has a
very good description of the I2C protocol.
It is wort...I2C trick?
Suppose you have the two I2C slaves that have to be connected to the
MCU. Both slaves have the same I2C address. The I2C master is simulated
by bit banging.
Would it be possible to swap SCL and SDA lines on one of the slaves so
both slaves can be addressed independently? Can this cause any "side
DSP and Mixed Signal Design Consultant
Vladimir Vassilevsky wrote:
> Suppose you have the two I2C slaves that have to be connected to the
>MCU. Both slaves have the same I2C address.
First time I hear somebody doing t...