dsi: add support for DSI host peripheral

Adapted from the stm32h7xx-hal implementation, changed to use
register accessor functions and use the RCC enable/reset
mechanisms which are different in the stm32f4xx-hal.

Changes the `LtdcPins` argument to the `DisplayController` to
be an `Option`, as they aren't used (and aren't needed for DSI
interfaces).

Author: tegimeki

Cargo.toml

@@ -38,6 +38,7 @@ synopsys-usb-otg = { version = "0.4.0", features = [
 ], optional = true }
 sdio-host = { version = "0.9.0", optional = true }
 embedded-dma = "0.2.0"
+embedded-display-controller = { version = "^0.2.0", optional = true }
 bare-metal = { version = "1" }
 void = { default-features = false, version = "1.0.2" }
 display-interface = { version = "0.5.0", optional = true }
@@ -502,7 +503,7 @@ dcmi = []
 dfsdm1 = ["dfsdm"]
 dfsdm2 = ["dfsdm"]
 dma2d = []
-dsihost = []
+dsihost = ["embedded-display-controller"]
 eth = []
 fmc = []
 fsmc = []

README.md

@@ -56,6 +56,7 @@ single model.
 * `usb_fs` or `usb_hs` — USB OTG FS/HS peripheral support. See [synopsys-usb-otg](https://crates.io/crates/synopsys-usb-otg).
 * `fsmc_lcd` — LCD support via FMC/FSMC peripheral. See [display-interface](https://crates.io/crates/display-interface).
 * `sdio-host` — SDIO peripheral support. See [sdio-host](https://crates.io/crates/sdio-host).
+* `dsihost` — DSI host support. See [embedded-display-controller](https://crates.io/crates/embedded-display-controller).
 
 Collaboration on this crate is highly welcome as are pull requests!
 

examples/ltdc-screen/screen.rs

@@ -35,7 +35,7 @@ impl<T: 'static + SupportedWord> Stm32F7DiscoDisplay<T> {
         let controller = DisplayController::new(
             ltdc,
             dma2d,
-            pins,
+            Some(pins),
             PixelFormat::RGB565,
             DISCO_SCREEN_CONFIG,
             Some(25.MHz()),