Enable I2C Alternate Function Remapping #152
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jobitjoseph
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Oct 28, 2025
This adds support for using I2C with the alternate mappings PD1, PD0 and PC5, PC6. To use PD1 (the SWDIO pin), pinV32_DisconnectDebug(PD_1) must be called before Wire.begin(), not sure if this should be documented somewhere or added to the code? I also changed the existing default mapping to use AFIO_Remap_I2C1_DISABLE so that it is possible to change the pin mapping back to the default at runtime. Tested on CHV0003F4P6-EVT-R0. Source openwch/arduino_core_ch32#152
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This adds support for using I2C with the alternate mappings
PD1, PD0andPC5, PC6.To use
PD1(the SWDIO pin),pinV32_DisconnectDebug(PD_1)must be called beforeWire.begin(), not sure if this should be documented somewhere or added to the code?I also changed the existing default mapping to use
AFIO_Remap_I2C1_DISABLEso that it is possible to change the pin mapping back to the default at runtime.Tested on CHV0003F4P6-EVT-R0.