[display] Support SH1106 Display, Improve SSD1306 Display

[TomSaw]

Support SH1106

Various SSD1306 Displays sold today do actually integrate the cheaper SH1106. This thing is said to be compatible with SSD1306 what's not 100% the case: SH1106 does only support Page MemoryMode. thus requires a different writeDisplay() routine than actually used for modm::Ssd1306.

Current result using modm::Ssd1306 with SH1106

When sending a frame, one has to alternate between setting the incremented page-address and sending page-data.

However, SSD1306 can also be driven in MemoryMode::PAGE but would result in worse performance vs. transmitting the whole frame aSh1106t once like it is now, thanks to MemoryMode::VERTICAL / MemoryMode::HORIZONTAL.

Solutions

1. Create a class Sh1106 inheriting Ssd1306 and override for the differences.
2. Pass MemoryMode as template parameter to Ssd1306 and specialize for the differences.
3. Pass Ssd1306_I2cWriteTransaction as template parameter and handle the differences there.

I've choosen 1. because:

• SH1106 is a different IC and deserves it's own class. The compatibility to SSD1306 is expressed by the strong inheritance on `Ssd1306
• Solution 3. sounds elegant but results in more complex code cause way more binding is required between SSD1306 and Ssd1306_I2cWriteTransaction.
• One does not want to drive SSD1306 in MemoryMode::PAGE due to worse performance. This excludes 2. and 3.

Improved SSD1306

Structure

• Detailed Registers in own header ′ssd1306_register.hpp′
• Renamed DataTranmissionAdapter -> Ssd1306_I2cWriteTransaction for clarification
• removed numerous cumbersome WriteData() methods

Performance

• Bulk data transmissions
  • Much faster Initialize() and slightly faster writeDisplay()
  • Size of commandBuffer could be halfed
• Simplified Ssd1306_I2cWriteTransaction

Flipped buffer[x][y] to buffer[y][x]

The current layout of MonochromeGraphicDisplay::buffer is not directly compatible with the memory-order requested by SH1106. For SH1106 we need the rows ( x-dimension) being ordered behind each other rather than the columns.
SH1106 unfortunately offers no other options for MemoryMode to adjust for the current buffer-layout.
Kindly Ssd1306 comes to meet the constraints of SH106. We can switch from MemoryMode::VERTICAL -> MemoryMode::HORIZONTAL in Ssd1306::initialisation(). Now SSD1306 also receives the rows in a line so the buffer dimensions could be flipped: buffer[x][y] -> buffer[y][x].

[salkinium]

Did you mean to close this PR?

[TomSaw]

I broke my branch due to bad stashing-strategy. This closed the PR and for the ease, i've just made a new one #627

[salkinium]

Ok, no problem.
Just FYI: the semester has begun and we all busy with exercises and lectures, so expect some delay in reviews…