Integrated STM32F4 I2C HAL functions.
Changed old "I2C_SPEED" to "I2C_CLK_RATE" in order not to conflict with HAL. Use TOUCH_INT again to gate touch sampling.
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Changed old "I2C_SPEED" to "I2C_CLK_RATE" in order not to conflict with HAL. Use TOUCH_INT again to gate touch sampling.