diff --git a/firmware/masterchip/spi_proto.c b/firmware/masterchip/spi_proto.c
deleted file mode 120000
index a86d415..0000000
--- a/firmware/masterchip/spi_proto.c
+++ /dev/null
@@ -1 +0,0 @@
-../shared/spi_proto.c
\ No newline at end of file
diff --git a/firmware/masterchip/spi_proto.c b/firmware/masterchip/spi_proto.c
new file mode 100644
index 0000000..c12e128
--- /dev/null
+++ b/firmware/masterchip/spi_proto.c
@@ -0,0 +1,52 @@
+#include "spi_proto.h"
+#include "spi.h"
+
+uint8_t read[2];
+uint8_t write[4];
+
+void talk_to_slave(uint8_t opcode, uint8_t addr, uint8_t wlen, uint8_t rlen)
+{
+	write[0] = opcode;
+	write[1] = addr;
+	spi_mst_start_packet();
+	spi_mst_write(wlen, write);
+	spi_mst_read(rlen, read);
+	spi_mst_end_packet();
+}
+
+uint16_t read_temperature(uint8_t number)
+{
+	talk_to_slave(1, number, 2, 2);
+	return (read[0] << 8) | read[1];
+}
+
+uint8_t read_var8(uint8_t number)
+{
+	talk_to_slave(2, number, 2, 2);
+	return read[1];
+}
+
+uint16_t read_var16(uint8_t number)
+{
+	talk_to_slave(3, number, 2, 2);
+	return (read[0] << 8) | read[1];
+}
+
+void write_var8(uint8_t number, uint8_t value)
+{
+	write[2] = 0;
+	write[3] = number;
+	talk_to_slave(4, number, 4, 0);
+}
+
+void write_var16(uint8_t number, uint16_t value)
+{
+	write[2] = value >> 8;
+	write[3] = value & 0xff;
+	talk_to_slave(5, number, 4, 0);
+}
+
+void call_func(uint8_t number)
+{
+	talk_to_slave(6, number, 2, 0);
+}
diff --git a/firmware/masterchip/spi_proto.h b/firmware/masterchip/spi_proto.h
deleted file mode 120000
index 8d40308..0000000
--- a/firmware/masterchip/spi_proto.h
+++ /dev/null
@@ -1 +0,0 @@
-../shared/spi_proto.h
\ No newline at end of file
diff --git a/firmware/masterchip/spi_proto.h b/firmware/masterchip/spi_proto.h
new file mode 100644
index 0000000..c7861fc
--- /dev/null
+++ b/firmware/masterchip/spi_proto.h
@@ -0,0 +1,11 @@
+#ifndef SPI_PROTO_H
+#define SPI_PROTO_H
+
+uint16_t read_temperature(uint8_t number);
+uint8_t read_var8(uint8_t number);
+uint16_t read_var16(uint8_t number);
+void write_var8(uint8_t number, uint8_t value);
+void write_var16(uint8_t number, uint16_t value);
+void call_func(uint8_t number);
+
+#endif
diff --git a/firmware/shared/spi_proto.c b/firmware/shared/spi_proto.c
deleted file mode 100644
index bcf9928..0000000
--- a/firmware/shared/spi_proto.c
+++ /dev/null
@@ -1,30 +0,0 @@
-#include "spi_proto.h"
-
-uint8_t spi_proto_needswrite(uint8_t opcode) {
-  if(opcode == 4 || opcode == 5) return 1;
-  return 0;
-}
-
-uint16_t spi_proto_handlewrite(uint8_t opcode, uint8_t addr) {
-  if(opcode == 4) {
-    return (uint16_t) (*spi_proto_globals8[addr]);
-  } else if(opcode == 5) {
-    return (*spi_proto_globals16[addr]);
-  } else {
-      return 0xFFFF;
-  }
-
-}
-
-void spi_proto_handleread(uint8_t opcode, uint8_t addr, uint16_t data) {
-  if(opcode == 2) {
-    *spi_proto_globals8[addr] = (uint8_t) data;
-  } else if(opcode == 3) {
-    *spi_proto_globals16[addr] = data;
-  } else if (opcode == 6) {
-    funptr_t func = spi_proto_funcs[addr];
-    (*func)();
-  } else {
-    // boom
-  }
-}
diff --git a/firmware/shared/spi_proto.h b/firmware/shared/spi_proto.h
deleted file mode 100644
index e57f691..0000000
--- a/firmware/shared/spi_proto.h
+++ /dev/null
@@ -1,18 +0,0 @@
-#ifndef __SPIPROTO_H
-#define __SPIPROTO_H
-
-#include <stdint.h>
-#include "main.h"
-
-typedef void(*funptr_t)();
-
-
-extern uint16_t *spi_proto_globals8[];
-extern uint8_t *spi_proto_globals16[];
-extern funptr_t spi_proto_funcs[];
-
-uint8_t spi_proto_needswrite(uint8_t opcode);
-uint16_t spi_proto_handlewrite(uint8_t opcode, uint8_t addr);
-void spi_proto_handleread(uint8_t opcode, uint8_t addr, uint16_t data);
-
-#endif
diff --git a/firmware/slavechip/spi_proto.c b/firmware/slavechip/spi_proto.c
deleted file mode 120000
index a86d415..0000000
--- a/firmware/slavechip/spi_proto.c
+++ /dev/null
@@ -1 +0,0 @@
-../shared/spi_proto.c
\ No newline at end of file
diff --git a/firmware/slavechip/spi_proto.c b/firmware/slavechip/spi_proto.c
new file mode 100644
index 0000000..bcf9928
--- /dev/null
+++ b/firmware/slavechip/spi_proto.c
@@ -0,0 +1,30 @@
+#include "spi_proto.h"
+
+uint8_t spi_proto_needswrite(uint8_t opcode) {
+  if(opcode == 4 || opcode == 5) return 1;
+  return 0;
+}
+
+uint16_t spi_proto_handlewrite(uint8_t opcode, uint8_t addr) {
+  if(opcode == 4) {
+    return (uint16_t) (*spi_proto_globals8[addr]);
+  } else if(opcode == 5) {
+    return (*spi_proto_globals16[addr]);
+  } else {
+      return 0xFFFF;
+  }
+
+}
+
+void spi_proto_handleread(uint8_t opcode, uint8_t addr, uint16_t data) {
+  if(opcode == 2) {
+    *spi_proto_globals8[addr] = (uint8_t) data;
+  } else if(opcode == 3) {
+    *spi_proto_globals16[addr] = data;
+  } else if (opcode == 6) {
+    funptr_t func = spi_proto_funcs[addr];
+    (*func)();
+  } else {
+    // boom
+  }
+}
diff --git a/firmware/slavechip/spi_proto.h b/firmware/slavechip/spi_proto.h
deleted file mode 120000
index 8d40308..0000000
--- a/firmware/slavechip/spi_proto.h
+++ /dev/null
@@ -1 +0,0 @@
-../shared/spi_proto.h
\ No newline at end of file
diff --git a/firmware/slavechip/spi_proto.h b/firmware/slavechip/spi_proto.h
new file mode 100644
index 0000000..e57f691
--- /dev/null
+++ b/firmware/slavechip/spi_proto.h
@@ -0,0 +1,18 @@
+#ifndef __SPIPROTO_H
+#define __SPIPROTO_H
+
+#include <stdint.h>
+#include "main.h"
+
+typedef void(*funptr_t)();
+
+
+extern uint16_t *spi_proto_globals8[];
+extern uint8_t *spi_proto_globals16[];
+extern funptr_t spi_proto_funcs[];
+
+uint8_t spi_proto_needswrite(uint8_t opcode);
+uint16_t spi_proto_handlewrite(uint8_t opcode, uint8_t addr);
+void spi_proto_handleread(uint8_t opcode, uint8_t addr, uint16_t data);
+
+#endif