ModusToolbox Bluetooth SDK

[AsRa_264661]

Hi ALL,

I tried to drive OLED display (i2c interface) with CYW920819EVB-02 kit. The result is, only the half of screen works.. https://www.instagram.com/p/Bz5xHbzH6no/

It was working code nothing wrong in cmds or anything, then i tried the same code with PSoC4 and its works well.. https://www.instagram.com/p/Bz-ALrBHbLh/

In both case i used 100k baud-rate.

CYW920819EVB-02 -> Pins-> scl_pin = WICED_P27 .sda_pin = WICED_P32

i changed the pins also but stil the result is same. so something goes wrong with wiced_hal_i2c_write( but always it returns SUCCESS.

Please let me know, what could be the difference between PSoC4 I2C & WICED I2C.

Thanks

Ashok r

[AnjanaM_61]

Hi Ashok,

Not sure what is the issue. Can you please share your WICED application to have a look into code?

Thanks,
Anjana

[AsRa_264661]

Hi Anjana,

Please find the attachment.

Thanks
Ashok r

[AsRa_264661]

Hi AnjanaM_61​ DheerajP_41​ MichaelF_56​

Can anyone respond please, running out of time...

Thanks

Ashok r

[AsRa_264661]

Hi All, AnjanaM_61​ DheerajP_41​

I solved this issue temporarily from my application end. but  WICED i2C has issue !

Thanks

Ashok r

[AnjanaM_61]

Hi Ashok,

Please be assured that we are checking on issue with I2C side.

Meanwhile it will be great if you can share the fix which you are using.

Thanks,
Anjana

[AsRa_264661]

Hi Anjana,

Seems like, the i2c payload is limited by 64bytes, if i send more then 64

bytes , the i2c sends zero after 64th byte.

Thanks

Ashok r

On Mon, 29 Jul 2019 at 12:08, AnjanaM_61 <community-manager@cypress.com>

[AnjanaM_61 · Accepted solution]

Hi Ashok,

I checked internally and confirmed that this is a limitation. 

HW buffer is 64 bytes. In that  slave address is 1 byte. So maximum payload is 63 bytes.

Thanks,

Anjana