Review epd2in9bc

[robweber]

Review the function calls for the Waveshare device and make sure the omni-epd abstraction uses the right methods, with the right parameters based on the library and example code. Any modifications should be patched in a PR referencing this issue.

Library file: https://github.com/waveshare/e-Paper/blob/master/RaspberryPi_JetsonNano/python/lib/waveshare_epd/epd2in9bc.py https://github.com/waveshare/e-Paper/blob/master/RaspberryPi_JetsonNano/python/lib/waveshare_epd/epd2in9b_V3.py Example code: https://github.com/waveshare/e-Paper/blob/master/RaspberryPi_JetsonNano/python/examples/epd_2in9bc_test.py https://github.com/waveshare/e-Paper/blob/master/RaspberryPi_JetsonNano/python/examples/epd_2in9bc_test.py

Things to check:

• [x] init() method
• [x] display() method
• [x] clear() method
• [x] sleep() method