I2C3 not worked due to it's GPIO pin definition has been missing on board.h. Fix it through include two pin macros on stm32l4x3xx_pinmap.h to board.h. GPIO_I2C3_SCL and GPIO_I2C3_SDA is pointing A7 and B4 respectively.
I2C3 not worked due to it's GPIO pin definition has been missing on board.h. Fix it through include two pin macros on stm32l4x3xx_pinmap.h to board.h. GPIO_I2C3_SCL and GPIO_I2C3_SDA is pointing A7 and B4 respectively.