Add pull-up resistor to I2C pins ??

I'm assuming you wish to use internal pullups.

To learn how to configure those, go to the I2C block in your "TopDesign" page and open up the datasheet. This provides you with all the info you need.

Find table 1, as this summarises configuring the pins.

Then to configure internal pullups just find the "Internal Pullups" section in the datasheet.

Within this section it basically tells you to...

Add the following code before starting the Component (with SCB_Start()) - don't forget to change "SCB" part to match same name as your I2C block. In my case my block name was simply "I2C".

/* Change SCL and SDA pins drive mode to Resistive Pull Up */
SCB_scl_SetDriveMode(SCB_scl_DM_RES_UP);
SCB_sda_SetDriveMode(SCB_sda_DM_RES_UP);

(also don't forget to check that the "slew rate" properly matches clock speed as this caused problems with me once before).

Hope that helps.

Thanks for helping me out !!!

Now I'm having problems with the coding part. I'm trying to read the data using CY8CKIT-042CY8CKIT-042 from the sensor via I2C, so I'm using the I2C component in the kit as the master device (because the pull-up pins send the start condition)

Do you know if there is any code examples to read the I2C from the outside sensor ?? I can only find the code examples which demonstrates the I2C communication between the PsOc 4 and PsOc 5LP on the kit (https://www.element14.com/community/message/75946/l/psoc-4-pioneer-kit-community-project05-usb-i2c-utility#75946 )

And I also don't know how to verify the I2c transmission has succeeded or not. Is there any register or any software to see the I2C data transmission.

If you know how, please help me out with these problems. Thanks. 

I suggest two things.

1. Read through the "I2C APIs" section in the datasheet as this provides a very handy reference of all the functions available for use. There is a very handy summary table, which provides both the "Slave" and "Master" functions (in that order). As you want to read data from a sensor there are two functions:

SCB_I2CMasterReadBuf();
SCB_I2CMasterReadByte();

2. Then to understand how to use these functions, I found that the three I2C master examples provided in PSoC Creator (via the "Find Code Example..." option on the start page and then choosing PSoC 4200 as "Device Family") were sufficient to get me started. These were:

• I2C_Master_High_Level - this example uses the Read Buffer method
• I2C_Master_Low_Level - this example uses the Read Byte method
• I2C_SCB_Master - this example uses the Read Buffer method

When you download these examples, it will also download a PDF document, which explains what these examples do. I found the first two example documentation to be pretty good. The 3rd one (I2C_SCB_Master) was not that helpful in explaining the I2C code.

Besides documentation, the last example is probably the easier one to get started (IMO) as all the code is in the main.c file.

Note, that in my experience, I sometimes found that the sensor documentation and associated I2C methods to get the sensor data may require you to use the low level functionality. But suggest just starting with the high level methods first, as simpler.

Hope that helps.

PS. check through above examples as they also demonstrate how to check that transmission completed etc.