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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17
examples/stm32/stm32-h103/miniblink/miniblink.c
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@@ -24,7 +24,7 @@ void gpio_setup(void)
{
/* Enable GPIOC clock. */
/* Manually: */
// RCC_APB2ENR |= IOPCEN;
// RCC_APB2ENR |= RCC_APB2ENR_IOPCEN;
/* Using API functions: */
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN);
@@ -47,19 +47,24 @@ int main(void)
while (1) {
/* Manually: */
// GPIOC_BSRR = GPIO12; /* LED off */
// for (i = 0; i < 80000; i++); /* Wait (needs -O0 CFLAGS). */
// for (i = 0; i < 800000; i++) /* Wait a bit. */
// __asm__("nop");
// GPIOC_BRR = GPIO12; /* LED on */
// for (i = 0; i < 80000; i++); /* Wait (needs -O0 CFLAGS). */
// for (i = 0; i < 800000; i++) /* Wait a bit. */
// __asm__("nop");
/* Using API functions gpio_set()/gpio_clear(): */
// gpio_set(GPIOC, GPIO12); /* LED off */
// for (i = 0; i < 80000; i++); /* Wait (needs -O0 CFLAGS). */
// for (i = 0; i < 800000; i++) /* Wait a bit. */
// __asm__("nop");
// gpio_clear(GPIOC, GPIO12); /* LED on */
// for (i = 0; i < 80000; i++); /* Wait (needs -O0 CFLAGS). */
// for (i = 0; i < 800000; i++) /* Wait a bit. */
// __asm__("nop");
/* Using API function gpio_toggle(): */
gpio_toggle(GPIOC, GPIO12); /* LED on/off */
for (i = 0; i < 80000; i++); /* Wait (needs -O0 CFLAGS). */
for (i = 0; i < 800000; i++) /* Wait a bit. */
__asm__("nop");
}
return 0;