move all highlevel code into the protocol folder

protocol/slave/slave.c

@@ -0,0 +1,48 @@
+/*
+ * slave.c
+ *
+ * this is a default implementation for a slave
+ * it will continously encode its state on request
+ */
+
+#include "slave.h"
+#include "../communication.h"
+
+
+// implementation for slave_encode
+void slave_encode(iface_t *iface, int16_t s) {
+	iface->write(iface, (s>>0)&0x7F);
+	iface->write(iface, (s>>7)&0x7F);
+}
+
+void slave_on_receive(iface_t * me, byte_t buffer, void *ptr)
+{
+	slave_t * slave = (slave_t*)ptr;
+
+	if (!IS_EOM(buffer)) {
+		me->write(me, buffer);
+		return;
+	}
+
+	me->write(me, buffer & 0x7F);
+
+	// write state
+	// write potis
+	for (int i = 0; i < 4; i++)
+		slave_encode(me, slave->state.poti[i]);
+
+	// write slider
+	slave_encode(me, slave->state.slider);
+
+	me->write(me, 0x80 | (slave->state.button & 0x01));
+}
+
+void slave_init(slave_t *slave, iface_t *iface)
+{
+	iface->on_read = slave_on_receive;
+	iface->callback_data = slave;
+
+	slave->iface = iface;
+	slave->state = (message_t){};
+}
+

protocol/slave/slave.h

@@ -0,0 +1,36 @@
+/*
+ * slave.h
+ *
+ * contains a slave definition
+ */
+
+#pragma once
+
+#include "../communication.h"
+#include "../interface.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// this struct describes one chain in the link 
+typedef struct
+{
+	iface_t * iface;
+	message_t state;
+} slave_t;
+
+// The slave will use this method to encode 
+// one adc sample
+void slave_encode(iface_t *iface, int16_t s);
+
+// initialize the slave 
+void slave_init(slave_t *slave, iface_t *iface);
+
+
+
+#ifdef __cplusplus
+} // end extern "C"
+#endif
+
+