libtock-c
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drivers: fix touch driver
The PR fixes the way in which the touch driver reads the multi touch events. Before this, the touch driver was accessing the shared readwrite buffer while still being shared with the driver.
The touch driver is now using a double buffering for reading multi touch events and one command syscall less, but needs https://github.com/tock/tock/pull/3252 or https://github.com/tock/tock/pull/3258.