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better asm loop

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This commit is contained in:
MightyPork
2018-01-02 22:51:10 +01:00
parent 5cbc9fa6dd
commit a3df4d79e1
2 changed files with 4 additions and 17 deletions
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units/neopixel/ws2812.c
+1 -13
View File
@@ -4,7 +4,7 @@
#define FREQ_STEP (PLAT_AHB_MHZ/20.0f)
#define NPX_DELAY_SHORT (uint32_t)(FREQ_STEP*1.5f)
#define NPX_DELAY_LONG (uint32_t)(FREQ_STEP*3.5f)
#define NPX_DELAY_SHOW (uint32_t)(FREQ_STEP*60)
#define NPX_DELAY_SHOW (uint32_t)(FREQ_STEP*50)
static inline __attribute__((always_inline))
void ws2812_byte(GPIO_TypeDef *port, uint32_t ll_pin, uint8_t b)
@@ -42,10 +42,6 @@ void ws2812_load_raw(GPIO_TypeDef *port, uint32_t ll_pin, uint8_t *rgbs, uint32_
}
vPortExitCritical();
__asm_loop(NPX_DELAY_SHOW);
LL_GPIO_SetOutputPin(port, ll_pin);
__asm_loop(NPX_DELAY_SHORT);
LL_GPIO_ResetOutputPin(port, ll_pin);
}
/** Set many RGBs from uint32 stream */
@@ -72,10 +68,6 @@ void ws2812_load_sparse(GPIO_TypeDef *port, uint32_t ll_pin, uint8_t *rgbs, uint
}
vPortExitCritical();
__asm_loop(NPX_DELAY_SHOW);
LL_GPIO_SetOutputPin(port, ll_pin);
__asm_loop(NPX_DELAY_SHORT);
LL_GPIO_ResetOutputPin(port, ll_pin);
}
/** Set many RGBs */
@@ -87,8 +79,4 @@ void ws2812_clear(GPIO_TypeDef *port, uint32_t ll_pin, uint32_t count)
}
vPortExitCritical();
__asm_loop(NPX_DELAY_SHOW);
LL_GPIO_SetOutputPin(port, ll_pin);
__asm_loop(NPX_DELAY_SHORT);
LL_GPIO_ResetOutputPin(port, ll_pin);
}
utils/cortex_utils.h
+3 -4
View File
@@ -26,15 +26,14 @@ static inline bool isDynAlloc(const void *obj)
/** Tight asm loop */
#define __asm_loop(cycles) \
do { \
register uint32_t _count = cycles; \
register uint32_t _count asm ("r4") = cycles; \
asm volatile( \
".syntax unified\n" \
".thumb\n" \
"ldr r4, =%0\n" \
"0:" \
"subs r4, #1\n" \
"subs %0, #1\n" \
"bne 0b\n" \
: /* no outputs */ : "g" (cycles) : "r4"); \
: "+r" (_count)); \
} while(0)
#endif //GEX_CORTEX_UTILS_H