add brightness setting function

libs/bao1x-hal/src/sh1107.rs

@@ -14,6 +14,9 @@ pub const PAGE: u8 = ROW as u8 / 8;
 // IFRAM space reserved for UDMA channel commands
 const SIDEBAND_LEN: usize = 256;
 
+// 0x4f is a bit too bright
+pub const DEFAULT_BRIGHTNESS: u8 = 0x3f;
+
 pub struct MainThreadToken(());
 impl MainThreadToken {
     pub fn new() -> Self { MainThreadToken(()) }
@@ -465,7 +468,7 @@ impl<'a> Oled128x128<'a> {
             SetDCDCSettings(0x0),
             SetStartLine(0),
             SetDisplayOffset(0),
-            SetContrastControl(0x3f), // was 0x4f, was a bit too bright
+            SetContrastControl(DEFAULT_BRIGHTNESS),
             SetAddressMode(AddressMode::Column),
             SetSegmentReMap(false),
             SetCOMScanDirection(Direction::Inverted),
@@ -513,6 +516,11 @@ impl<'a> Oled128x128<'a> {
         self.powerdown = false;
     }
 
+    pub fn brightness(&mut self, level: u8) {
+        let bytes = Command::SetContrastControl(level).encode();
+        self.send_command(bytes);
+    }
+
     #[cfg(feature = "std")]
     pub fn render_bitmap(&mut self, bitmap: ux_api::service::api::BaosecBitmap) {
         const W: isize = WIDTH as _;

libs/ux-api/src/service/api.rs

@@ -110,6 +110,8 @@ pub enum GfxOpcode {
     #[cfg(feature = "board-baosec")]
     /// This call is specific and highly optimized to the display on Baosec
     BaosecBitmap,
+    #[cfg(feature = "board-baosec")]
+    Brightness,
 
     /// Gutter for invalid calls
     InvalidCall,

libs/ux-api/src/service/gfx.rs

@@ -792,6 +792,15 @@ impl Gfx {
         Ok(())
     }
 
+    #[cfg(feature = "board-baosec")]
+    pub fn brightness(&self, level: u8) -> Result<(), xous::Error> {
+        send_message(
+            self.conn,
+            Message::new_blocking_scalar(GfxOpcode::Brightness.to_usize().unwrap(), level as usize, 0, 0, 0),
+        )
+        .map(|_| ())
+    }
+
     #[cfg(feature = "hosted-baosec")]
     pub fn acquire_qr(&self) -> Result<QrAcquisition, xous::Error> {
         let dummy = "otpauth://totp/ACME%20Co:john.doe@email.com?secret=HXDMVJECJJWSRB3HWIZR4IFUGFTMXBOZ&issuer=ACME%20Co&algorithm=SHA1&digits=6&period=30".to_string();

services/bao-video/src/main.rs

@@ -870,6 +870,13 @@ pub fn wrapped_main(main_thread_token: MainThreadToken) -> ! {
                     let bitmap = buffer.to_original::<BaosecBitmap, _>().unwrap();
                     display.render_bitmap(bitmap);
                 }
+                #[cfg(feature = "board-baosec")]
+                GfxOpcode::Brightness => {
+                    if let Some(scalar) = msg.body.scalar_message_mut() {
+                        let brightness = scalar.arg1.min(255) as u8;
+                        display.brightness(brightness);
+                    }
+                }
                 GfxOpcode::Quit => break,
                 _ => {
                     // This is perfectly normal because not all opcodes are handled by all platforms.