playground-stm32/neopixel_f103_mvp
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(mostly) assembly timings

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This commit is contained in:
Attila BODY 2018-12-15 10:32:53 +01:00
parent b59a086a82
commit 61bd8c7632
6 changed files with 275 additions and 186 deletions
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90
Src/main.c
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@ -99,42 +99,100 @@ int main(void)
/* Infinite loop */
/* USER CODE BEGIN WHILE */
asm volatile(
" movs r3, #1000 \n\t"
"1: subs r3, #1 \n\t"
" bne 1b \n\t"
: : : "r3", "cc"
);
asm volatile("\tmovs r3, #1000\n1:\tsubs r3, #1\n\tbne 1b\n\t" : : : "r3", "cc");
GPIOB->ODR = 0;
volatile uint32_t v;
uint8_t ledbytes[] = {0x0f, 0xf0, 0};
uint8_t ledbytes[] = {0, 0xff, 0, 0xff, 0x55, 0xaa};
__disable_irq();
#define W_1f 5
#define W_0f 0
#define W_0s 3
#define W_1af
#define W_1as ++v; ++v
#define W_0af ++v; ++v
#define W_0as ++v; ++v
/*
#define SHIFTBIT(x) \
if(b&(1<<x)) { \
GPIOB->BSRR = (1 << 11); \
for( v=W_1f; v != 0; --v); \
W_1af; \
GPIOB->BSRR = (1 << (16+11)); \
W_1as; \
} else { \
GPIOB->BSRR = (1 << 11); \
for( v=W_0f; v != 0; --v); \
W_0af; \
GPIOB->BSRR = (1 << (16+11)); \
for( v=W_0s; v != 0; --v); \
W_0as; \
}
*/
#define SHIFTBIT(x) \
if(b&(1<<x)) { \
GPIOB->BSRR = (1 << 11); \
asm volatile("\tmov r3, #10\n1:\tsubs r3, #1\n\tbne 1b\n\t" : : : "r3", "cc"); \
GPIOB->BSRR = (1 << (16+11)); \
asm volatile("\tmov r3, #03\n1:\tsubs r3, #1\n\tbne 1b\n\t" : : : "r3", "cc"); \
} else { \
GPIOB->BSRR = (1 << 11); \
asm volatile("\tmov r3, #03\n1:\tsubs r3, #1\n\tbne 1b\n\t" : : : "r3", "cc"); \
GPIOB->BSRR = (1 << (16+11)); \
asm volatile("\tmov r3, #10\n1:\tsubs r3, #1\n\tbne 1b\n\t" : : : "r3", "cc"); \
}
__disable_irq();
while(1)
{
uint32_t *bitPtr = BITBAND_RAM(ledbytes, 0);
uint32_t cnt = sizeof(ledbytes)*8 + 1;
uint8_t *bufPtr = ledbytes;
uint32_t cnt = sizeof(ledbytes) + 1;
while(--cnt) {
uint32_t b = *bufPtr++;
SHIFTBIT(7);
SHIFTBIT(6);
SHIFTBIT(5);
SHIFTBIT(4);
SHIFTBIT(3);
SHIFTBIT(2);
SHIFTBIT(1);
if(*bitPtr++) {
GPIOB->BSRR = 1 << 11; //set
for( v=5; v != 0; --v); //long
GPIOB->BSRR = 1 << (16+11); //clear
++v; ++v; //short
if(b&1) {
GPIOB->BSRR = 1 << 11;
for( v=W_1f; v != 0; --v);
W_1af;
GPIOB->BSRR = 1 << (16+11);
W_1as;
} else {
GPIOB->BSRR = 1 << 11; //set
for( v=0; v != 0; --v); //short
++v;++v;
GPIOB->BSRR = 1 << (16+11); //clear
for( v=3; v != 0; --v); //long
++v; ++v;
GPIOB->BSRR = 1 << 11;
for( v=W_0f; v != 0; --v);
W_0af;
GPIOB->BSRR = 1 << (16+11);
for( v=W_0s; v != 0; --v);
++v; v=0;
}
}
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
for( v=400; v != 0; --v); //long
for( v=100; v != 0; --v); //long
}
/* USER CODE END 3 */
}
}
static void LL_Init(void)
{