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Adding Long Packet

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Lee Lup Yuen 2022-10-06 14:08:24 +08:00
parent 9d403711e3
commit b182aadf9a
1 changed files with 6 additions and 5 deletions
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11
display.zig
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@ -119,22 +119,23 @@ fn compose_long_packet(
const csl: u8 = @intCast(u8, cs & 0xff);
const csh: u8 = @intCast(u8, cs >> 8);
// Packet Header (4 bytes): Data Identifier + Word Count + Error Correction COde
// Packet Header (4 bytes) = Data Identifier + Word Count + Error Correction COde
const header = [4]u8 { di, wcl, wch, ecc };
// Packet Payload:
// Data (0 to 65,541 bytes):
// Number of data bytes should match the Word Count (WC)
assert(wc <= 65_541);
assert(len <= 65_541);
const payload = buf[0..len];
// Packet Footer (2 bytes): Checksum (CS)
// Packet Footer (2 bytes) = Checksum (CS)
const footer = [2]u8 { csl, csh };
// TODO: Packet = Packet Header + Payload + Packet Footer
// Packet = Packet Header + Payload + Packet Footer
var pkt = std.mem.zeroes([1024]u8);
assert(pkt.len >= header.len + len + footer.len); // Increase pkt size
std.mem.copy(u8, pkt[0..header.len], &header);
////std.mem.copy(u8, pkt[header.len..header.len + len], buf);
std.mem.copy(u8, pkt[header.len..], payload);
std.mem.copy(u8, pkt[(header.len + len)..], &footer);
const pktlen = header.len + len + footer.len;