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Created ESP32 DotStar Methods (markdown)

Shlomo Zippel
2023-01-08 15:44:11 -08:00
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# ESP32 Spi DotStar Methods
These methods all use DMA behind the scenes for async transfer, and most of the SPI buses support multiple pin outputs. Here is a summary of available buses and their supported bit width:
| MCU | Spi1 | Spi2 | Spi3 |
|-------------|-------------|----------------|-------------|
| ESP32 | 1x, 2x, 4x | 1x, 2x, 4x | 1x, 2x, 4x |
| ESP32-S2 | - | 1x, 2x, 4x, 8x | 1x |
| ESP32-S3 | - | 1x, 2x, 4x, 8x | 1x, 2x, 4x |
| ESP32-C3 | - | 1x, 2x, 4x | - |
For all of the following methods if a Spi bus number isn't specified then Spi2 will be used by default. A default speed of 10Mhz will be used
### Spi bus names
The older ESP32 parts (ESP32, ESP32-S2) used different names for the SPI buses. For example ESP32 used Hspi and Vspi for Spi2 and Spi3, respectively. ESP32-S2 used Fspi and Hspi for Spi2 and Spi3. The newer parts (ESP32-S3, ESP32-C3) dropped these names and is only using the numbered buses. We will always use the numbered buses to avoid the ambiguity
### Parallel data
Please note that the current implementation doesn't transpose the output for parallel output methods. Hopefully coming soon
## DotStarEsp32DmaSpi#Method
## DotStarEsp32DmaSpi#2BitMethod
## DotStarEsp32DmaSpi#4BitMethod
## DotStarEsp32DmaSpi#8BitMethod