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PSoC 5, 3 & 1

Anonymous
Not applicable

Hello,

I am trying to establish between the cypress board and the TI toolkit. I am fairly new to the I2C communication. Could the community please direct me to the appropriate tutorials?

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Bob_Marlowe
Expert II

Byte I2C interface is quite simple: After setting up the component and starting it you use

    I2C_MasterSendStart(DeviceAddress,I2C_WRITE_XFER_MODE);    // Initialize a transaction for writing

    I2C_MasterWriteByte(Register);                // Indicate which register you want to write to

    I2C_MasterWriteByte(Value);                // Write to register

    I2C_MasterSendStop();                    // End of transaction

When you want to read from a device you use (example for reading two bytes

    I2C_MasterSendStart(DeviceAddress,I2C_WRITE_XFER_MODE);    // Initialize a transaction for writing

    I2C_MasterWrite(Register);                // Indicate which register you want to write to

    I2C_MasterSendRestart(DeviceAddress,I2C_READ_XFER_MODE);

    I2C_MasterReadByte(I2C_ACK_DATA);            // Read from register

    I2C_MasterReadByte(I2C_NAK_DATA);            // Read from register, last byte is NAKed

    I2C_MasterSendStop();                    // End of transaction

Not too difficult. Keep in mind that most of the APIs (except those for reading a byte) return a status byte which, when non-zero indicate an error condition.

The high-level APIs must be used in this way:

Writing to slave Count bytes

I2C_MasterWriteBuf(SlaveAddress,DataPtr,Count,I2C_MODE_COMPLETE_XFER);

Reading from Slave sending register/command byte first:

I2C_MasterWriteBuf(SlaveAddress,&RegAddress,1,I2C_MODE_NO_STOP);

I2C_MasterReadBuf(SlaveAddress,DataPtr,Count,I2C_MODE_REPEAT_START);

Bob

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Bob_Marlowe
Expert II

Byte I2C interface is quite simple: After setting up the component and starting it you use

    I2C_MasterSendStart(DeviceAddress,I2C_WRITE_XFER_MODE);    // Initialize a transaction for writing

    I2C_MasterWriteByte(Register);                // Indicate which register you want to write to

    I2C_MasterWriteByte(Value);                // Write to register

    I2C_MasterSendStop();                    // End of transaction

When you want to read from a device you use (example for reading two bytes

    I2C_MasterSendStart(DeviceAddress,I2C_WRITE_XFER_MODE);    // Initialize a transaction for writing

    I2C_MasterWrite(Register);                // Indicate which register you want to write to

    I2C_MasterSendRestart(DeviceAddress,I2C_READ_XFER_MODE);

    I2C_MasterReadByte(I2C_ACK_DATA);            // Read from register

    I2C_MasterReadByte(I2C_NAK_DATA);            // Read from register, last byte is NAKed

    I2C_MasterSendStop();                    // End of transaction

Not too difficult. Keep in mind that most of the APIs (except those for reading a byte) return a status byte which, when non-zero indicate an error condition.

The high-level APIs must be used in this way:

Writing to slave Count bytes

I2C_MasterWriteBuf(SlaveAddress,DataPtr,Count,I2C_MODE_COMPLETE_XFER);

Reading from Slave sending register/command byte first:

I2C_MasterWriteBuf(SlaveAddress,&RegAddress,1,I2C_MODE_NO_STOP);

I2C_MasterReadBuf(SlaveAddress,DataPtr,Count,I2C_MODE_REPEAT_START);

Bob

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