Add IOConfig struct and pub fn io_config() #3272
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The STM32 TSC needs to do successive acquisitions when using multiple channels in a group. To do this the IOs must be configured for each acquisition. This change reflects the implementations in the STM32 HAL.
See:
Specifically, see the HAL solution provided. It shows that only one acquisition channel must enabled in a group during an acquisition cycle, then the next channel in the next acquisition cycle, and so on.
While this is about the STM Touch Library, table 8 (and others) show the acquisition timings required for multiple channels in a group.