lib_i2c is a fully featured, but lightweight library for the I2C peripheral on the CH32V003 with the following features:

• Support for All 3 Alternative Pinouts
• Support 7-bit Addresses (7-bit aligned, eg 0bx1101000 - 0x68)
• Support 8-bit Registers
• Up to 1MHz Bus Frequency has been tested. Can be set higher.
• Easy to use I2C Error Status'
• Funcion to Scan the Interface for devices
• Master Mode Only

CNLohr's ch32fun PlatformIO Template

• v5.5 - Adapted funconfig.h to modern ch32fun. Slight change to demo. Tested on CH32V006
• v5.4 - Added a read_reg_delay() function for when clock-stretching is inadequate
• v5.3 - Added an easier user-definable clock-stretch timout variable
• v5.2 - Fixed a define bug in the header - Testing complete of multi-byte registers
• v5.1 - Refactored a few things to be more efficient, added support for 10Bit Addresses
• v5.0 - Added Multi-Byte Register support (up to 4 bytes) with config in i2c_device_t
  Changed init() to use the device pointer, multiple devices can still be used at once
  Added read & write raw functions - without use of registers
• v4.3 - Began refactor to allow 7bit, 10bit and 16bit addresses. Only supports 7bit currently
• v4.2 - Protected most loops with timeout and error propegation
• v4.1 - Added i2c_wait to simplify waiting for bus to be free
• v4.0 - Refactored using inlined functions for expandability (i2c_start(), i2c_stop() etc)
• v3.5 - Converted from ch32v003fun to ch32fun
• v3.4 - Fixed an off-by-one error in i2c_read

• Neaten library so there are less repeated chunks of code
• Test on other MCU Variants:
  • CH32V003 ✔️
  • CH32V006 ✔️

Thank you niansa for continued help refining the library
Thank you Johannes JKT for fixing an i2c_read off_by_one bug

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