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2) As per FX3 TRM, the S-port I/O drive strength is programmable similar to any other I/O pin as discussed in 4.1.2 I/O Drive Strength on page 53.
what is file located for IO drive strength configuration?
>> To change the drive strength of the S port you need to write to the register GCTL_DS. The project does not contain the API for doing that. You can use CyU3PWriteDeviceRegisters/CyU3PReadDeviceRegisters APIs to write/read to the register. The register can be written with different drive strength in firmware
You can refer to the source of this CyU3PSetGpioDriveStrength API to get more details on writing to the register. Similarly, you can set particular bits of the GCTL_DS register according to your application
Please let me know if you have any queries on this