feat: Replies to pings (ignoring crc)

app/src/i3c/checksum.h

@@ -0,0 +1,18 @@
+#ifndef __UTIL_CHECKSUM_H_
+#define __UTIL_CHECKSUM_H_
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+
+typedef uint8_t crc8_t;
+
+void crc8_init(crc8_t *crc);
+void crc8_add(crc8_t *crc, uint8_t value);
+void crc8_addSlice(crc8_t *crc, const void *data, size_t size);
+void crc8_finish(crc8_t *crc);
+crc8_t crc8_calc(const void *data, size_t size);
+bool crc8_eq(const crc8_t *a, const crc8_t *b);
+bool crc8_valid(const crc8_t *crc, const void *data, size_t size);
+
+#endif