diff options
Diffstat (limited to 'tmk_core/common/wait.h')
| -rw-r--r-- | tmk_core/common/wait.h | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/tmk_core/common/wait.h b/tmk_core/common/wait.h index 89128e9daf..28224fe3aa 100644 --- a/tmk_core/common/wait.h +++ b/tmk_core/common/wait.h @@ -6,10 +6,89 @@ 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) \ |