Wire live serial data into matrix renderer

src/serial_core/utils.rs

@@ -0,0 +1,10 @@
+use std::time::Instant;
+
+pub fn calc_crc8_itu(c: &[u8]) -> u8 {
+    let crc8_itu_alg = crc::Crc::<u8>::new(&crc::CRC_8_I_432_1);
+    crc8_itu_alg.checksum(c)
+}
+
+pub fn elapsed_millis(start_at: Instant) -> u64 {
+    start_at.elapsed().as_millis() as u64
+}