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Add CRC

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This commit is contained in:
Lee Lup Yuen 2022-10-06 15:16:09 +08:00
parent a53572dee3
commit 13cb94c74b
1 changed files with 14 additions and 6 deletions
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20
display.zig
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@ -35,6 +35,7 @@ const c = @cImport({
@cInclude("arch/types.h"); @cInclude("arch/types.h");
@cInclude("../../nuttx/include/limits.h"); @cInclude("../../nuttx/include/limits.h");
@cInclude("nuttx/config.h"); @cInclude("nuttx/config.h");
@cInclude("nuttx/crc16.h");
@cInclude("inttypes.h"); @cInclude("inttypes.h");
@cInclude("unistd.h"); @cInclude("unistd.h");
@cInclude("stdlib.h"); @cInclude("stdlib.h");
@ -132,10 +133,8 @@ fn composeLongPacket(
std.mem.copy(u8, pkt[header.len..], payload); // `len` bytes std.mem.copy(u8, pkt[header.len..], payload); // `len` bytes
// Packet Footer comes later, after we have computed CRC... // Packet Footer comes later, after we have computed CRC...
// TODO: Checksum (CS) (2 bytes): // Checksum (CS) (2 bytes):
// - 16-bit Cyclic Redundancy Check (CRC) // - 16-bit Cyclic Redundancy Check (CRC)
// See "12.3.6.13: Packet Footer", Page 210 of BL808 Reference Manual:
// https://github.com/sipeed/sipeed2022_autumn_competition/blob/main/assets/BL808_RM_en.pdf)
const cs: u16 = computeCrc(pkt[0..(pktlen - 2)]); const cs: u16 = computeCrc(pkt[0..(pktlen - 2)]);
const csl: u8 = @intCast(u8, cs & 0xff); const csl: u8 = @intCast(u8, cs & 0xff);
const csh: u8 = @intCast(u8, cs >> 8); const csh: u8 = @intCast(u8, cs >> 8);
@ -194,13 +193,19 @@ fn computeEcc(
| (@intCast(u8, ecc[7]) << 7); | (@intCast(u8, ecc[7]) << 7);
} }
/// Compute 16-bit Cyclic Redundancy Check (CRC).
/// See "12.3.6.13: Packet Footer", Page 210 of BL808 Reference Manual:
/// https://github.com/sipeed/sipeed2022_autumn_competition/blob/main/assets/BL808_RM_en.pdf)
fn computeCrc( fn computeCrc(
data: []u8 data: []u8
) u8 { ) u16 {
_ = data; // Use NuttX CRC16
return 0; return c.crc16(data.ptr, data.len);
} }
///////////////////////////////////////////////////////////////////////////////
// MIPI DSI Types
/// MIPI DSI Device /// MIPI DSI Device
pub const mipi_dsi_device = extern struct { pub const mipi_dsi_device = extern struct {
/// Number of Data Lanes /// Number of Data Lanes
@ -251,6 +256,9 @@ pub const mipi_dsi_timings = extern struct {
vsync: u32, vsync: u32,
}; };
///////////////////////////////////////////////////////////////////////////////
// Test Functions
/// Main Function for Null App /// Main Function for Null App
pub export fn null_main(_argc: c_int, _argv: [*]const [*]const u8) c_int { pub export fn null_main(_argc: c_int, _argv: [*]const [*]const u8) c_int {
_ = _argc; _ = _argc;