Fix LCD_CAM i8080 potentially sending garbage data to display (#1301)

esp-hal/CHANGELOG.md

@@ -23,6 +23,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - ESP32: Apply fix for Errata 3.6 in all the places necessary. (#1315)
 - ESP32 & ESP32-S2: Fix I²C frequency (#1306)
 - UART's TX/RX FIFOs are now cleared during initialization (#1344)
+- Fixed `LCD_CAM I8080` driver potentially sending garbage to display (#1301)
+
 
 ### Changed
 

esp-hal/src/lcd_cam/lcd/i8080.rs

@@ -374,6 +374,10 @@ impl<'d, TX: Tx, P> I8080<'d, TX, P> {
             .lc_dma_int_clr()
             .write(|w| w.lcd_trans_done_int_clr().set_bit());
 
+        // Before issuing lcd_start need to wait shortly for fifo to get data
+        // Otherwise, some garbage data will be sent out
+        crate::rom::ets_delay_us(1);
+
         self.lcd_cam
             .lcd_user()
             .modify(|_, w| w.lcd_update().set_bit().lcd_start().set_bit());