From ea4fdcf26a7163294a82bc8ebdfb5d35cac7dc5c Mon Sep 17 00:00:00 2001
From: Ben Jackson <ben@ben.com>
Date: Fri, 4 Mar 2011 00:14:19 -0800
Subject: [PATCH] mendel.c, pinio.c: Make Z axes optional.

---
 mendel.c | 6 ++++--
 pinio.h  | 6 ++++++
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/mendel.c b/mendel.c
index 0f200af..51efcb1 100644
--- a/mendel.c
+++ b/mendel.c
@@ -80,8 +80,10 @@ void io_init(void) {
 		WRITE(Y_ENABLE_PIN, 1); SET_OUTPUT(Y_ENABLE_PIN);
 	#endif
 	
-	WRITE(Z_STEP_PIN, 0);	SET_OUTPUT(Z_STEP_PIN);
-	WRITE(Z_DIR_PIN,  0);	SET_OUTPUT(Z_DIR_PIN);
+	#if defined Z_STEP_PIN && defined Z_DIR_PIN
+		WRITE(Z_STEP_PIN, 0);	SET_OUTPUT(Z_STEP_PIN);
+		WRITE(Z_DIR_PIN,  0);	SET_OUTPUT(Z_DIR_PIN);
+	#endif
 	#ifdef Z_MIN_PIN
 		SET_INPUT(Z_MIN_PIN);
 		#ifdef USE_INTERNAL_PULLUPS
diff --git a/pinio.h b/pinio.h
index 5598089..0b5e999 100644
--- a/pinio.h
+++ b/pinio.h
@@ -101,6 +101,7 @@ Y Stepper
 Z Stepper
 */
 
+#if defined Z_STEP_PIN && defined Z_DIR_PIN
 #define	_z_step(st)						WRITE(Z_STEP_PIN, st)
 #define	z_step()							_z_step(1);
 #ifndef	Z_INVERT_DIR
@@ -108,6 +109,11 @@ Z Stepper
 #else
 	#define	z_direction(dir)		WRITE(Z_DIR_PIN, dir^1)
 #endif
+#else
+#define _z_step(x)
+#define z_step()
+#define z_direction(x)
+#endif
 #ifdef	Z_MIN_PIN
 	#ifndef Z_INVERT_MIN
 		#define z_min()						(READ(Z_MIN_PIN)?1:0)