EMTime/libopencm3
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Use __asm__("nop") in the loop-based delays.

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Since we recently switched from -O0 to -Os, an increase in the loop count
as well as the addition of __asm__("nop") is required (so that the loop
doesn't get optimized/removed).
The real fix is to add a proper timer-based delay function, of course.

Also, fix a bunch of cosmetic issues and typos.
This commit is contained in:
Uwe Hermann
2011-01-03 01:12:07 +01:00
parent 05f66cde4c
commit ca53311bfc
11 changed files with 82 additions and 61 deletions
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19
examples/stm32/mb525/fancyblink/fancyblink.c
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@@ -27,7 +27,6 @@ void clock_setup(void)
/* Enable GPIOC clock. */
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN);
}
void gpio_setup(void)
@@ -49,22 +48,28 @@ int main(void)
while (1) {
gpio_toggle(GPIOC, GPIO6); /* LED on/off */
gpio_toggle(GPIOC, GPIO7); /* LED on/off */
for (i = 0; i < 400000; i++); /* Wait (needs -O0 CFLAGS). */
for (i = 0; i < 4000000; i++) /* Wait a bit. */
__asm__("nop");
gpio_toggle(GPIOC, GPIO7); /* LED on/off */
gpio_toggle(GPIOC, GPIO8); /* LED on/off */
for (i = 0; i < 400000; i++); /* Wait (needs -O0 CFLAGS). */
for (i = 0; i < 4000000; i++) /* Wait a bit. */
__asm__("nop");
gpio_toggle(GPIOC, GPIO8); /* LED on/off */
gpio_toggle(GPIOC, GPIO9); /* LED on/off */
for (i = 0; i < 400000; i++); /* Wait (needs -O0 CFLAGS). */
for (i = 0; i < 4000000; i++) /* Wait a bit. */
__asm__("nop");
gpio_toggle(GPIOC, GPIO8); /* LED on/off */
gpio_toggle(GPIOC, GPIO9); /* LED on/off */
for (i = 0; i < 400000; i++); /* Wait (needs -O0 CFLAGS). */
for (i = 0; i < 4000000; i++) /* Wait a bit. */
__asm__("nop");
gpio_toggle(GPIOC, GPIO7); /* LED on/off */
gpio_toggle(GPIOC, GPIO8); /* LED on/off */
for (i = 0; i < 400000; i++); /* Wait (needs -O0 CFLAGS). */
for (i = 0; i < 4000000; i++) /* Wait a bit. */
__asm__("nop");
gpio_toggle(GPIOC, GPIO6); /* LED on/off */
gpio_toggle(GPIOC, GPIO7); /* LED on/off */
for (i = 0; i < 400000; i++); /* Wait (needs -O0 CFLAGS). */
for (i = 0; i < 4000000; i++) /* Wait a bit. */
__asm__("nop");
}
return 0;