Here are the classes, structs, unions and interfaces with brief descriptions:

CSTM32BusIORegister	Represents one addressable, read-only, MSB-first register accessed over an STM32SPIDevice, using the "set the top address bit to read" convention (Adafruit_BusIO's ADDRBIT8_HIGH_TOREAD) – e.g. the TSC2046's control byte, whose own START bit already occupies that same top bit, so the OR this class performs is a documented no-op for that specific chip, but is kept for fidelity with the reference API and in case a future chip using this same addressing convention needs the OR to actually do something
CSTM32SPIDevice	Wraps one SPI peripheral + chip-select pin into read/write/transfer operations, mirroring the hardware-SPI subset of Adafruit_BusIO's Adafruit_SPIDevice API
CtouchSelfTestReport_t	Result of the most recent touchSelfTestRunAll()
CTSC2046	STM32 HAL driver for a TI/Adafruit TSC2046 resistive touchscreen controller, reached over SPI via an owned STM32SPIDevice
CTSC2046TouchPoint	One touch reading: raw X/Y position and a pressure-proportional resistance value