Welcome to the forum,
We need some more details - please see How to write your question to maximize your chances to find a solution
@hareshel wrote:
sparkfun thing plus stm32f4
You mean this: https://www.sparkfun.com/sparkfun-thing-plus-stm32.html ?
As it's a 3rd-party board - not ST's board - your first port of call should be Sparkfun:
https://www.sparkfun.com/support
https://community.sparkfun.com/
Have you followed their Getting Started guide:
https://learn.sparkfun.com/tutorials/stm32-thing-plus-hookup-guide#software-setup-and-programming
@hareshel wrote:
Programmed i2c bus in slave mode and sending the serial data to the i2c bus.
Please give more detail on that.
Show your code: How to insert source code.
If it's a slave, what is the master?
Please show your connections.
What debugging have you done so far?
A complex system that works is invariably found to have evolved from a simple system that worked.
A complex system designed from scratch never works and cannot be patched up to make it work.
