I2C on Mikromedia HMI 7" with breakout board

[mrpoons]

I am developing an application using the new Mikromedia HMI 7" display and the Mikromedia HMI breakout board. The application required that I get data from an I2C peripheral. I have implemented a number drivers for this peripheral in the past and have used them to confirm that the peripheral is working as expected.

I have implemented my code using the only FT90x example available. The I2C_Simple example for the EasyFT90x V7

I have initialized the I2C Module using

I2CM1_Init(_I2CM_SPEED_MODE_STANDARD, _I2CM_SWAP_DISABLE);

and read the device using

I2CM1_Set_Slave_Address(SLAVE_ADDRESS);
I2CM1_Write(0x01);
I2CM1_Read(rxData);

And nothing...

I have a scope attached to the I2C0_SCL and I2C0_SDA lines on the breakout board and I have nothing...

I can see that the library functions show...

I2CM1_XXXX

and the breakout board shows

I2C0 SCL and I2C0 SDA

The help files are confusing as they note

I²C library routines require you to specify the module you want to use. To select the desired I²C module, simply change the letter n in the routine prototype for a number from 0 to 5.

But there is no letter n in the routine prototype to change.

I was hoping someone from Mikromedia could answer a couple of questions...

Is there an I2C example for the Mikromedia HMI?

Does the I2C library functions which reference I2CM1 actually control I2C0 on the processor?

Thanks

Mike

[nadir.celebic]

Hi,

I will take a look in it, test it and let you know about the results.

Regards,
Nadir

[mrpoons]

Thanks, much appreciated

[nadir.celebic]

Hi,

Yes, I2CM1 in the code controls I2C0 on the MCU.
If you want to make mikromedia HMI as Slave, I recommend to use SPI Slave on MAIN Connector .

But, I will make a simple project for mikromedia HMI 7", which represents I2C function.

Regards,
Nadir

[mrpoons]

Thanks Nadir,

I am trying to make the Micromedia HMI the Master and my peripheral the Slave.

I have a scope on the I2C lines and don't see anything. I am clearly doing something wrong to initialize the I2C, and example would be much appreciated.

Mike

[nadir.celebic]

Hi,

Please, can you attach here the detailed photos of your hardware configuration ?
Also, you can attach here your project in zip.

Regards,
Nadir

[mrpoons]

Thanks Nadir,

I attached the project I created and a photo of the hardware. We are using the Micromedia HMI 7" display to show the status of a battery which includes a charging circuit and monitor. The Mikromedia HMI 7" Display is connected to a Mikromedia HMI breakout board which is in-turn connected to a shared ground and the SDA and SCL lines from the battery.

I have code running on a ARM Cortex M4 processor which reads the battery status properly using 12C.

I have connected a scope to the I2C0_SCL and I2C0_SDA lines on the breakout board and I don't see any communication from the processor.

I2CM1_Write() always returns _I2CM_STATUS_ERROR

Mike

[nadir.celebic]

Hi,

For I2C communication you need some I2C module, in this case I used the EEPROM click
http://www.mikroe.com/click/eeprom/ and mikromedia HMI 5".
Please take a look on photo in attachment and try I2C example.

NOTE: If you don't have I2C module you will not get a signal on an oscilloscope.