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@@ -1,2 +1,48 @@
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This is a collection of misc libraries, examples, etc. for stm32f103 (aka blue pill) + libopencm3
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(+ FreeRTOS, sometimes)
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+
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+AD9850
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+========
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+
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+Control some DDS like AD9850 and AD9851.
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+
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+This library doesn't use SPI, just regular GPIO: this is simpler (imho) to implement and understand, and gives
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+you freedom to use whichever pin you prefer.
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+
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+Notes
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+-------
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+Support for ad9833 is completely lacking (despite some code you might find).
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+
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+I am uncertain about ad9850/1: the two are similar, and I have some difficulties understanding which do I
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+have. However, I think the implementation is correct.
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+
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+Rotary TBL
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+===========
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+
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+Rotary encoder reading implemented with interrupts and lookup tables. This implementation uses a single
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+interrupt, both on rising and falling.
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+
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+Credits to http://makeatronics.blogspot.com/2013/02/efficiently-reading-quadrature-with.html
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+
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+_This is not a library, just an example_
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+
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+The example uses FreeRTOS just for convenience, you can easily remove it.
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+
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+Rotary TBL2
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+===========
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+
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+Same as before, but with interrupts on both ports of the rotary encoder. It is more precise but, well, "uses"
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+one more interrupt.
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+
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+Credits to http://makeatronics.blogspot.com/2013/02/efficiently-reading-quadrature-with.html
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+
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+The example uses FreeRTOS just for convenience, you can easily remove it.
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+
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+_This is not a library, just an example_
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+
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+SSD1306
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+=======
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+
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+Controls the oled display SSD1306.
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+
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+SPI is used, so you don't have complete freedom on which pin/port to choose.
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