CY7C65211 - USB-to-I2C bridge

[Ivan_Lee]

Hi, Sir,

1. Does CY7C65211A support "I2C - Repeart Start" ?

2. and how to generate the “repeated START” with the CY7C65211A?

could you please provide sample code?

https://www.i2c-bus.org/repeated-start-condition/ 

[Meghavi · Accepted solution]

Hi Ivan,

CY7C65211A supports repeated start condition. 

Kindly let us know which OS you are using.

Regards

[Ivan_Lee]

Hi, Meghavi,

    The OS is Linux (kernel 4.12, 4.19 and 5.4).

BR

Ivan

[Ivan_Lee]

Hi, Meghavi,

1. How to how to generate the “repeated START” with the CY7C65211A?

2. how to configure CY7C65211A to “Mode = I2C and Protocol = Vendor / CDC” and “PID = 0x0004”.

   i can't select"Protocol to CDC" when "Mode is I2C" by USB-Serial configuration utility.

[Ivan_Lee]

Hi, Meghavi,

I am try to generate the “repeated START”.

i don't know why it has big time gap (74ms) between write packet and read pack.

Is it correct  "repeated START” ?

//Initialize the CY_I2C_DATA_CONFIG variable

    cyI2CDataConfig.isStopBit = false;

    cyDatabuffer.length = 2;   

    rStatus = CyI2cWrite (cyHandle, &cyI2CDataConfig, &cyDatabuffer, 5000);

    if (rStatus != CY_SUCCESS){

        printf ("CyI2cWrite Failed ...retrying %d \n", rStatus);

        return rStatus;

        }

//Initialize the CY_I2C_DATA_CONFIG variable

    cyI2CDataConfig.isStopBit = true;

    cyI2CDataConfig.isNakBit = true;

    intError = 0;

    memset (bufferRead, 0, 64);

    rStatus = CyI2cRead (cyHandle, &cyI2CDataConfig, &cyDatabuffer, 5000);

[MallikaK_22]

Hi,

Apologies for the delay in my response.

Yes, this seems correct. After the write operation, the read operation began without the STOP condition. 

Also, can you share screenshots from USB configuration utility when you are trying to configure in CDC.

Regards,

Mallika