add tactile_a codec

src-tauri/src/serial_core/utils.rs

@@ -0,0 +1,38 @@
+use std::time::Instant;
+
+pub fn usize_to_u16_be_bytes(n: usize) -> [u8; 2] {
+    (n as u16).to_be_bytes()
+}
+
+pub fn usize_to_u16_le_bytes(n: usize) -> [u8; 2] {
+    (n as u16).to_be_bytes()
+}
+
+pub fn u16_to_hex_be_bytes(n: u16) -> [u8; 2] {
+    (n as u16).to_be_bytes()
+}
+
+pub fn u16_to_hex_le_bytes(n: u16) -> [u8; 2] {
+    (n as u16).to_le_bytes()
+}
+
+pub fn crc8(data: &[u8]) -> u8 {
+    let mut crc: u8 = 0x00;
+
+    for &byte in data {
+        crc ^= byte;
+        for _ in 0..8 {
+            if (crc & 0x80) != 0 {
+                crc = (crc << 1) ^ 0x07;
+            } else {
+                crc <<= 1;
+            }
+        }
+    }
+
+    crc
+}
+
+pub fn elapsed_millis(start_at: Instant) -> u64 {
+    start_at.elapsed().as_millis() as u64
+}