diff options
Diffstat (limited to 'tmk_core/common/wait.h')
| -rw-r--r-- | tmk_core/common/wait.h | 52 |
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) \ |