ARM: split out architecture specific parts for delay.c

(Hopefully) no functional change.

Also remove these wd_reset()s in delay_us() to match the behaviour
promised in delay.h. Not that this matters much, watchdog is
disabled by default.

delay-arm.c

@@ -0,0 +1,17 @@
+
+/** \file
+  \brief Delay routines, ARM specific part.
+*/
+
+#if defined TEACUP_C_INCLUDE && defined __ARMEL__
+
+/** Delay in microseconds.
+
+  \param delay Time to wait in microseconds.
+
+  To Be Defined.
+*/
+void delay_us(uint16_t delay) {
+}
+
+#endif /* defined TEACUP_C_INCLUDE && defined __ARMEL__ */

delay-avr.c

@@ -0,0 +1,53 @@
+
+/** \file
+  \brief Delay routines, AVR specific part.
+*/
+
+#if defined TEACUP_C_INCLUDE && defined __AVR__
+
+#include <util/delay_basic.h>
+
+#if F_CPU < 4000000UL
+  #error Delay functions on AVR only work with F_CPU >= 4000000UL
+#endif
+
+
+/** Delay in microseconds.
+
+  \param delay Time to wait in microseconds.
+
+  Calibrated in SimulAVR.
+
+  Accuracy on 20 MHz CPU clock: -1/+3 clock cycles over the whole range(!).
+  Accuracy on 16 MHz CPU clock: delay is about 0.8% too short.
+
+  Exceptions are delays of 0..2 on 20 MHz, which are all 0.75 us and delays
+  of 0..3 on 16 MHz, which are all 0.93us.
+*/
+void delay_us(uint16_t delay) {
+  // Compensate call overhead, as close as possible.
+  #define OVERHEAD_CALL_CLOCKS 39 // clock cycles
+  #define OVERHEAD_CALL_DIV ((OVERHEAD_CALL_CLOCKS / (F_CPU / 1000000)) + 1)
+  #define OVERHEAD_CALL_REM ((OVERHEAD_CALL_DIV * (F_CPU / 1000000)) - \
+                             OVERHEAD_CALL_CLOCKS)
+
+  if (delay > OVERHEAD_CALL_DIV) {
+    delay -= OVERHEAD_CALL_DIV;
+    if (OVERHEAD_CALL_REM >= 2)
+      _delay_loop_2((OVERHEAD_CALL_REM + 2) / 4);
+  }
+  else {
+    return;
+  }
+
+  while (delay > (65536L / (F_CPU / 4000000L))) {
+    #define OVERHEAD_LOOP_CLOCKS 13
+
+    _delay_loop_2(65536 - (OVERHEAD_LOOP_CLOCKS + 2) / 4);
+    delay -= (65536L / (F_CPU / 4000000L));
+  }
+  if (delay)
+    _delay_loop_2(delay * (F_CPU / 4000000L));
+}
+
+#endif /* defined TEACUP_C_INCLUDE && defined __AVR__ */

delay.c

@@ -4,60 +4,20 @@
 	\brief Delay routines
 */
 
-#include	<stdint.h>
+#define TEACUP_C_INCLUDE
-#include	<util/delay_basic.h>
+#include "delay-avr.c"
+#include "delay-arm.c"
+#undef TEACUP_C_INCLUDE
+
 #include "watchdog.h"
 
-#if F_CPU < 4000000UL
-#error Delay functions only work with F_CPU >= 4000000UL 
-#endif
 
-/** Delay in microseconds
+/** Delay in milliseconds.
-  \param delay time to wait in microseconds
 
-  Calibrated in SimulAVR.
+  \param delay Time to wait in milliseconds.
 
-  Accuracy on 20 MHz CPU clock: -1/+3 clock cycles over the whole range(!).
+  Accuracy on AVR, 20 MHz: delay < 0.04% too long over the whole range.
-  Accuracy on 16 MHz CPU clock: delay is about 0.8% too short.
+  Accuracy on AVR, 16 MHz: delay < 0.8% too short over the whole range.
-
-  Exceptions are delays of 0..2 on 20 MHz, which are all 0.75 us and delays
-  of 0..3 on 16 MHz, which are all 0.93us.
-*/
-void delay_us(uint16_t delay) {
-	wd_reset();
-
-  // Compensate call overhead, as close as possible.
-  #define OVERHEAD_CALL_CLOCKS 39 // clock cycles
-  #define OVERHEAD_CALL_DIV ((OVERHEAD_CALL_CLOCKS / (F_CPU / 1000000)) + 1)
-  #define OVERHEAD_CALL_REM ((OVERHEAD_CALL_DIV * (F_CPU / 1000000)) - \
-                             OVERHEAD_CALL_CLOCKS)
-
-  if (delay > OVERHEAD_CALL_DIV) {
-    delay -= OVERHEAD_CALL_DIV;
-    if (OVERHEAD_CALL_REM >= 2)
-      _delay_loop_2((OVERHEAD_CALL_REM + 2) / 4);
-  }
-  else {
-    return;
-  }
-
-	while (delay > (65536L / (F_CPU / 4000000L))) {
-    #define OVERHEAD_LOOP_CLOCKS 13
-
-    _delay_loop_2(65536 - (OVERHEAD_LOOP_CLOCKS + 2) / 4);
-		delay -= (65536L / (F_CPU / 4000000L));
-		wd_reset();
-	}
-  if (delay)
-    _delay_loop_2(delay * (F_CPU / 4000000L));
-	wd_reset();
-}
-
-/** Delay in microseconds
-  \param delay time to wait in milliseconds
-
-  Accuracy on 20 MHz: delay < 0.04% too long over the whole range.
-  Accuracy on 16 MHz: delay < 0.8% too short over the whole range.
 */
 void delay_ms(uint32_t delay) {
 	wd_reset();