ARM: bring in pinio.c.

This enables pinio_init(), power_on() and power_off(). Now one
can turn on the power supply with M119 and turn it off with M2.

Code changes were neccessary. Setting a pin first, then making
it an output doesn't work on ARM. A pin has to be an output
before it permanently accepts a given state. As I was never
sure the former strategy actually worked on AVR, the order of
these two steps was changed for both, AVR and ARM.

Makefile-ARM

@@ -98,7 +98,7 @@ TARGET = $(PROGRAM).hex
 # Until the generic ARM port is completed, we'd have to wrap all sources
 # in #ifdef __AVR__. To avoid this, build only a selection for now:
 SOURCES  = mendel.c cpu.c serial.c sermsg.c sersendf.c delay.c
-SOURCES += gcode_parse.c gcode_process.c
+SOURCES += gcode_parse.c gcode_process.c pinio.c
 ifeq ($(MCU), lpc1114)
   SOURCES += cmsis-system_lpc11xx.c
 endif

gcode_process.c

@@ -385,8 +385,8 @@ void process_gcode_command() {
 				queue_wait();
 				for (i = 0; i < NUM_HEATERS; i++)
 					temp_set(i, 0);
-				power_off();
         #endif /* __ARMEL_NOTYET__ */
+				power_off();
         serial_writestr_P(PSTR("\nstop\n"));
 				break;
 
@@ -627,8 +627,10 @@ void process_gcode_command() {
         #ifndef __ARMEL_NOTYET__
         timer_stop();
         queue_flush();
+        #endif /* __ARMEL_NOTYET__ */
         power_off();
         cli();
+        #ifndef __ARMEL_NOTYET__
         for (;;)
           wd_reset();
         #endif /* __ARMEL_NOTYET__ */
@@ -708,9 +710,7 @@ void process_gcode_command() {
         //? --- M119: report endstop status ---
         //? Report the current status of the endstops configured in the
         //? firmware to the host.
-        #ifndef __ARMEL_NOTYET__
         power_on();
-        #endif /* __ARMEL_NOTYET__ */
         endstops_on();
         delay_ms(10); // allow the signal to stabilize
         {

mendel.c

@@ -87,10 +87,10 @@ void init(void) {
 	// set up G-code parsing
 	gcode_init();
 
-  #ifndef __ARMEL_NOTYET__
 	// set up inputs and outputs
   pinio_init();
 
+  #ifndef __ARMEL_NOTYET__
   #if defined TEMP_MAX6675 || defined SD
     spi_init();
   #endif

pinio.c

@@ -12,8 +12,8 @@ volatile uint8_t	psu_timeout = 0;
 */
 void pinio_init(void) {
   /// X Stepper.
-  WRITE(X_STEP_PIN, 0); SET_OUTPUT(X_STEP_PIN);
+  SET_OUTPUT(X_STEP_PIN); WRITE(X_STEP_PIN, 0);
-  WRITE(X_DIR_PIN,  0); SET_OUTPUT(X_DIR_PIN);
+  SET_OUTPUT(X_DIR_PIN); WRITE(X_DIR_PIN, 0);
   #ifdef X_MIN_PIN
     SET_INPUT(X_MIN_PIN);
     PULLUP_OFF(X_MIN_PIN);
@@ -24,8 +24,8 @@ void pinio_init(void) {
   #endif
 
   /// Y Stepper.
-  WRITE(Y_STEP_PIN, 0); SET_OUTPUT(Y_STEP_PIN);
+  SET_OUTPUT(Y_STEP_PIN); WRITE(Y_STEP_PIN, 0);
-  WRITE(Y_DIR_PIN,  0); SET_OUTPUT(Y_DIR_PIN);
+  SET_OUTPUT(Y_DIR_PIN); WRITE(Y_DIR_PIN, 0);
   #ifdef Y_MIN_PIN
     SET_INPUT(Y_MIN_PIN);
     PULLUP_OFF(Y_MIN_PIN);
@@ -37,8 +37,8 @@ void pinio_init(void) {
 
   /// Z Stepper.
   #if defined Z_STEP_PIN && defined Z_DIR_PIN
-    WRITE(Z_STEP_PIN, 0); SET_OUTPUT(Z_STEP_PIN);
+    SET_OUTPUT(Z_STEP_PIN); WRITE(Z_STEP_PIN, 0);
-    WRITE(Z_DIR_PIN,  0); SET_OUTPUT(Z_DIR_PIN);
+    SET_OUTPUT(Z_DIR_PIN); WRITE(Z_DIR_PIN, 0);
   #endif
   #ifdef Z_MIN_PIN
     SET_INPUT(Z_MIN_PIN);
@@ -50,58 +50,58 @@ void pinio_init(void) {
   #endif
 
   #if defined E_STEP_PIN && defined E_DIR_PIN
-    WRITE(E_STEP_PIN, 0); SET_OUTPUT(E_STEP_PIN);
+    SET_OUTPUT(E_STEP_PIN); WRITE(E_STEP_PIN, 0);
-    WRITE(E_DIR_PIN,  0); SET_OUTPUT(E_DIR_PIN);
+    SET_OUTPUT(E_DIR_PIN); WRITE(E_DIR_PIN, 0);
   #endif
 
   /// Common Stepper Enable.
   #ifdef STEPPER_ENABLE_PIN
+    SET_OUTPUT(STEPPER_ENABLE_PIN);
     #ifdef STEPPER_INVERT_ENABLE
       WRITE(STEPPER_ENABLE_PIN, 0);
     #else
       WRITE(STEPPER_ENABLE_PIN, 1);
     #endif
-    SET_OUTPUT(STEPPER_ENABLE_PIN);
   #endif
 
   /// X Stepper Enable.
   #ifdef X_ENABLE_PIN
+    SET_OUTPUT(X_ENABLE_PIN);
     #ifdef X_INVERT_ENABLE
       WRITE(X_ENABLE_PIN, 0);
     #else
       WRITE(X_ENABLE_PIN, 1);
     #endif
-    SET_OUTPUT(X_ENABLE_PIN);
   #endif
 
   /// Y Stepper Enable.
   #ifdef Y_ENABLE_PIN
+    SET_OUTPUT(Y_ENABLE_PIN);
     #ifdef Y_INVERT_ENABLE
       WRITE(Y_ENABLE_PIN, 0);
     #else
       WRITE(Y_ENABLE_PIN, 1);
     #endif
-    SET_OUTPUT(Y_ENABLE_PIN);
   #endif
 
   /// Z Stepper Enable.
   #ifdef Z_ENABLE_PIN
+    SET_OUTPUT(Z_ENABLE_PIN);
     #ifdef Z_INVERT_ENABLE
       WRITE(Z_ENABLE_PIN, 0);
     #else
       WRITE(Z_ENABLE_PIN, 1);
     #endif
-    SET_OUTPUT(Z_ENABLE_PIN);
   #endif
 
   /// E Stepper Enable.
   #ifdef E_ENABLE_PIN
+    SET_OUTPUT(E_ENABLE_PIN);
     #ifdef E_INVERT_ENABLE
       WRITE(E_ENABLE_PIN, 0);
     #else
       WRITE(E_ENABLE_PIN, 1);
     #endif
-    SET_OUTPUT(E_ENABLE_PIN);
   #endif
 
   #ifdef  STEPPER_ENABLE_PIN
@@ -109,8 +109,8 @@ void pinio_init(void) {
   #endif
 
   #ifdef DEBUG_LED_PIN
-    WRITE(DEBUG_LED_PIN, 0);
     SET_OUTPUT(DEBUG_LED_PIN);
+    WRITE(DEBUG_LED_PIN, 0);
   #endif
 }
 
@@ -118,8 +118,8 @@ void power_on() {
 
 	if (ps_is_on == 0) {
 		#ifdef	PS_ON_PIN
+      SET_OUTPUT(PS_ON_PIN);
 			WRITE(PS_ON_PIN, 0);
-			SET_OUTPUT(PS_ON_PIN);
 			delay_ms(500);
 		#endif
     #ifdef PS_MOSFET_PIN