Add paracli, a parallel port comm utility

paracomm.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#include <stdint.h>
+
+typedef void (*miso_cb_t)(const uint8_t* buff, uint8_t size);
+
+/** Must call first **/
+void paracomm_init(miso_cb_t miso_cb);
+
+/** Sends a single byte.
+ * Returns: 0 if no error, non-0 otherwise.
+ */
+int paracomm_send(uint8_t b);
+
+/** Call after reading a nibble from the port */
+void paracomm_feed(uint8_t n);
+
+/** Yields the next byte to send out the port */
+uint8_t paracomm_nextbyte();