Recover from init fail

src/drivers/spi_bus.rs

@@ -135,7 +135,7 @@ where
     RES2: OutputPin + 'static,
     DC: OutputPin + 'static,
 {
-    pub fn build(self) -> (PrimaryDisplay<'static>, [SecondaryDisplay<'static>; 3]) {
+    pub fn build(self) -> Result<(PrimaryDisplay<'static>, [SecondaryDisplay<'static>; 3]), Self> {
         let spi = Spi::new(
             self.spi_peripheral,
             SpiConfig::default()
@@ -178,7 +178,7 @@ where
         }
         .build();
 
-        (primary, secondaries)
+        Ok((primary, secondaries))
     }
 }