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This updates the rppal to embedded-hal 1.0.0-rc.1.
That is currently the latest released version. (This version is also implemented by esp-idf-hal. Which is good for portability of drivers between rppal and esp)
I tested SPI and I2C communication with rppal on a Raspi 2 with an adxl345 device.
Note:
embedded-hal now suggests to implement the embedded-io traits for uart.
See https://docs.rs/embedded-hal/1.0.0-rc.1/embedded_hal/index.html#serialuart-traits
This is not done with this PR, yet. That can be done later, if required.