Configuring and Controlling CY8C9560A with Atmel baord SAMD21 using I2C.

[Anonymous]

Hi ,

   

          I have a board module with cy8c9560a with two LEDs connected to GPIO PORT 0. I am trying to configure them from atmel board using I2C. Can you please tell me the baic steps to be followed like. 

   

1. start condition

   

2. which slave address ?

   

3. next which register address ? or before this step do i need to configure the pins as output pins

   

4. . .clock setting ?

       

I read the data sheet , i'm confused to how to start.

   

Please give me inputs.

   

Thanks and regards

   

R Madhu.

[SampathS_11 · Accepted solution]

Hi Madhu,

   

To know the slave address for this device, you have to read the Extendable Soft Addressing on page 9 in the datasheet.

   

Next you have to write to the Port Select Register (18h) with 0 (for GPIO Port0).

   

Then you have to write the Pin Direction Register (1ch) with the bit numbers which are connected to LEDs as 0 (output) and the rest as 1 (input)

   

Then you have to write to the Output Port 0 Register (08h) with the values for the LEDs to turn them on or off.

   

Attach the schematic of your module board, so that I may assist you in getting the slave address.

       

Sampath

[Anonymous]

Thanks Sampath,

   

However, now iam able to communicate with the Cypress from my Atmel Controller.

   

These steps i followed.

   

Selecting the SLAVE address as 0x21 for IO expander without read/write bit(since my API is taking care of R/W bits).

   

Next i wrote Register address 0x08 , to select Port 0 , and followed by 0x00 to make all pins Low , to blink the LEDs.

   

For reading also i taken 0x2e register , the device ID of Cypress 0x60h.

   

Atmel studio provided the Ready APIs to make my work easier, It is important to understand the APIs design.

   

Thanks & Regards,

   

R Madhu.