Adding Long Packet

display.zig

@@ -77,6 +77,31 @@ pub export fn nuttx_mipi_dsi_dcs_write(
     return 0;
 }
 
+// TODO: Compose Long Packet: https://lupyuen.github.io/articles/dsi#long-packet-for-mipi-dsi
+// Packet Header (4 bytes):
+// -   Data Identifier (DI) (1 byte):
+//     Virtual Channel Identifier (Bits 6 to 7)
+//     Data Type (Bits 0 to 5)
+//     (Virtual Channel should be 0, I think)
+//
+// -   Word Count (WC) (2 bytes)：
+//     Number of bytes in the Packet Payload
+//
+// -   Error Correction Code (ECC) (1 byte):
+//     Allow single-bit errors to be corrected and 2-bit errors to be detected in the Packet Header
+//     See "12.3.6.12: Error Correction Code", Page 208:
+//     https://github.com/sipeed/sipeed2022_autumn_competition/blob/main/assets/BL808_RM_en.pdf)
+//
+// Packet Payload:
+// -   Data (0 to 65,541 bytes):
+//     Number of data bytes should match the Word Count (WC)
+//
+// Packet Footer:
+// -   Checksum (CS) (2 bytes):
+//     16-bit Cyclic Redundancy Check (CRC)
+//     See "12.3.6.13: Packet Footer", Page 210:
+//     https://github.com/sipeed/sipeed2022_autumn_competition/blob/main/assets/BL808_RM_en.pdf)
+
 /// MIPI DSI Device
 pub const mipi_dsi_device = extern struct {
     /// Number of Data Lanes