ECIO 40Pin+I2C LCD

[sungchinghuang]

I tried working with it.
In flowcode 8,I can see the correct effect with the simulation function.
But it is not working on my ECIO circuits.
If anybody can tell to me why, I will be very grateful.

LCD Timer.fcfx

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LCD Timer.jpg (165.12 KiB) Viewed 5717 times

[medelec35]

Have you got the datasheet for the I2C LCD?
We need to check the address is correct.
Where did you get the address of 127 from?
I have seen an address set to 0x27 = 39 for a I2C LCD.
It may not be correct for your one, but worth a try?
Can you try 39 for the address?
Alternatively you could adapt this I2c Sniffer for your set up?
It also maybe worth measuring both clock and data voltages with no clock or data pulses present to make sure there are pull-up resistors pulling up to 5V

[sungchinghuang]

After I uploaded it with address 39, my I2C LCD still didn't working.
In Flowcode8，how can I use I2C Address Sniffer?

Thanks.

[medelec35]

Hi sungchinghuang,
Can you please answer questions from my previous post:

Have you got the datasheet for the I2C LCD?
We need to check the address is correct.
Where did you get the address of 127 from?

It also maybe worth measuring both clock and data voltages with no clock or data pulses present to make sure there are pull-up resistors pulling up to 5V

Are the pull-ups on the hardware, or do you have to add your own?
Finally, what connections of LCD go to what connections of ECIO?

I will also create the sniffer for ECIO

[sungchinghuang]

I don't have the I2C LCD's datasheet.I originally used address 39. I found that when ECIO was not working, I started searching for information on the Internet. Some users used address 63 and address 124 and address 127, etc. I tried it, but it still didn't work. I have also used Arduino to control this LCD. I used 0x27 in Arduino and it is usable.
I also tried to add a resistor on both the SDA and SCL lines, and wanted to make a pull-up function, but the LCD is still not working.
This program only has ECIO and LCD, and is not connected to other hardware.

[QMESAR]

I don't have the I2C LCD's datasheet.I originally used address 39. I found that when ECIO was not working, I started searching for information on the Internet. Some users used address 63 and address 124 and address 127, etc. I tried it, but it still didn't work. I have also used Arduino to control this LCD. I used 0x27 in Arduino and it is usable.
I also tried to add a resistor on both the SDA and SCL lines, and wanted to make a pull-up function, but the LCD is still not working.
This program only has ECIO and LCD, and is not connected to other hardware.

I always find these type of post very interesting.
If you have no datasheet and have no idea what the correct address should be ,then it makes it most important to use some tools to log and varify what your code and hardware is sending to the LCD.
Why don't you use a logic analyser which is standard equipment to test and design Communication protocols as I2C instead of just saying the ECIO is not working.if you have a problem you have to localize it down to a Component error/ HW error or code error,
As Martin advised you before use a I2C sniffer (analyser) to monitor what you are doing

[Benj]

Hello,

I used 0x27 in Arduino and it is usable.

Arduino uses the 7-bit address without a bit shift.

Flowcode requires a 8-bit value wich is a combination of the 7-bit I2C address and a single read/write bit.

So in Flowcode try 0x27 x 2 = 0x4E or 78 in decimal.

[medelec35]

Hi sungchinghuang,
Sorry for the delay, I was waiting for a ECIO40P to arrive.
Now it has, I can confirm the attached flowchart correctly reads addresses of All I2C components.
I believe you will need Comms C pack installed for this to work.
If you don't have comms C pack then let me know.
What you need is a serial terminal program like HyperTerminal or Tera Term (free open source)
Before you connect the power to ECIO40P, open device manager and select Ports (Com & LPT) to expand it.
Connect the USB lead into ECIO40P and see what USB com port is assigned to it.
For example with my set up:

USB serial1.png

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For my setup if using Tera Term I just need set serial port to com 7 (Set up, Serial port...)
Once serial port is assigned in serial comms software, Remove and reconnect power, then you should see the I2c addresses appear.
If not you will have an hardware issue.
If you get stuck I can assist you further.

[sungchinghuang]

Hi,medelec35
I am sorry that I replied so late.I have used the IC2 Address Sniffer ECIO40 USB.fcfx to find the I2C LCD Address.

Tera.jpg (74.83 KiB) Viewed 5453 times

But I always get different address by the same hardware.

Sniffer1.jpg (55.04 KiB) Viewed 5453 times

Sniffer2.jpg (62.27 KiB) Viewed 5453 times

Of course, my LCD still can't display, my God, it's really difficult.


Thank you very much for the help of the matrix company, I am very grateful.

[medelec35]

I don't know why all the other addresses appear?
Assuming you have a LCD as only connected I2C device?

As a guess, can you try E0?

I will try mine again to confirm its working ok.

Can you see a part number for the I2C chip?

[sungchinghuang]

Sorry, I don't know how to use E0. In flowcode, SDA and SCL are B0 and B1.

I put my I2C here.

I2C.jpg (84.85 KiB) Viewed 5436 times

I2C-1.jpg (64.69 KiB) Viewed 5435 times

As the relevant address did not appear, If 0x4E does not work,
I would look more closely at your hardware and connections to ECIO40P

[medelec35]

Found your datasheet here
So 0x27 is correct without bit shift.
So what Ben suggested as 0x4E is what I would use as well.
To try 0x4E just enter 0x4E in the Address Field of the LED properties.