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-rw-r--r--tmk_core/common/wait.h52
1 files changed, 52 insertions, 0 deletions
diff --git a/tmk_core/common/wait.h b/tmk_core/common/wait.h
index 89128e9daf..0b3fd755a9 100644
--- a/tmk_core/common/wait.h
+++ b/tmk_core/common/wait.h
@@ -6,10 +6,62 @@
extern "C" {
#endif
+#if defined(__ARMEL__) || defined(__ARMEB__)
+# ifndef __OPTIMIZE__
+# pragma message "Compiler optimizations disabled; wait_cpuclock() won't work as designed"
+# endif
+
+# define wait_cpuclock(x) wait_cpuclock_allnop(x)
+
+# define CLOCK_DELAY_NOP8 "nop\n\t nop\n\t nop\n\t nop\n\t nop\n\t nop\n\t nop\n\t nop\n\t"
+
+__attribute__((always_inline))
+static inline void wait_cpuclock_allnop(unsigned int n) { /* n: 1..135 */
+ /* The argument n must be a constant expression.
+ * That way, compiler optimization will remove unnecessary code. */
+ if (n < 1) { return; }
+ if (n > 8) {
+ unsigned int n8 = n/8;
+ n = n - n8*8;
+ switch (n8) {
+ case 16: asm volatile (CLOCK_DELAY_NOP8::: "memory");
+ case 15: asm volatile (CLOCK_DELAY_NOP8::: "memory");
+ case 14: asm volatile (CLOCK_DELAY_NOP8::: "memory");
+ case 13: asm volatile (CLOCK_DELAY_NOP8::: "memory");
+ case 12: asm volatile (CLOCK_DELAY_NOP8::: "memory");
+ case 11: asm volatile (CLOCK_DELAY_NOP8::: "memory");
+ case 10: asm volatile (CLOCK_DELAY_NOP8::: "memory");
+ case 9: asm volatile (CLOCK_DELAY_NOP8::: "memory");
+ case 8: asm volatile (CLOCK_DELAY_NOP8::: "memory");
+ case 7: asm volatile (CLOCK_DELAY_NOP8::: "memory");
+ case 6: asm volatile (CLOCK_DELAY_NOP8::: "memory");
+ case 5: asm volatile (CLOCK_DELAY_NOP8::: "memory");
+ case 4: asm volatile (CLOCK_DELAY_NOP8::: "memory");
+ case 3: asm volatile (CLOCK_DELAY_NOP8::: "memory");
+ case 2: asm volatile (CLOCK_DELAY_NOP8::: "memory");
+ case 1: asm volatile (CLOCK_DELAY_NOP8::: "memory");
+ case 0: break;
+ }
+ }
+ switch (n) {
+ case 8: asm volatile ("nop"::: "memory");
+ case 7: asm volatile ("nop"::: "memory");
+ case 6: asm volatile ("nop"::: "memory");
+ case 5: asm volatile ("nop"::: "memory");
+ case 4: asm volatile ("nop"::: "memory");
+ case 3: asm volatile ("nop"::: "memory");
+ case 2: asm volatile ("nop"::: "memory");
+ case 1: asm volatile ("nop"::: "memory");
+ case 0: break;
+ }
+}
+#endif
+
#if defined(__AVR__)
# include <util/delay.h>
# define wait_ms(ms) _delay_ms(ms)
# define wait_us(us) _delay_us(us)
+# define wait_cpuclock(x) __builtin_avr_delay_cycles(x)
#elif defined PROTOCOL_CHIBIOS
# include <ch.h>
# define wait_ms(ms) \