aboutsummaryrefslogtreecommitdiff
path: root/examples/stm32/stm32-h103/miniblink
diff options
context:
space:
mode:
authorUwe Hermann2011-01-03 01:12:07 +0100
committerUwe Hermann2011-01-03 01:12:07 +0100
commitca53311bfc3182212d53386c5f49f0bc57350266 (patch)
tree2a81b20c486717d0fea3d1987549c15d2bb529b2 /examples/stm32/stm32-h103/miniblink
parent05f66cde4cc2d9e57e495f6d8b51619f08191c68 (diff)
Use __asm__("nop") in the loop-based delays.
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.
Diffstat (limited to 'examples/stm32/stm32-h103/miniblink')
-rw-r--r--examples/stm32/stm32-h103/miniblink/miniblink.c17
1 files changed, 11 insertions, 6 deletions
diff --git a/examples/stm32/stm32-h103/miniblink/miniblink.c b/examples/stm32/stm32-h103/miniblink/miniblink.c
index 4bc781b..6f8bc2c 100644
--- a/examples/stm32/stm32-h103/miniblink/miniblink.c
+++ b/examples/stm32/stm32-h103/miniblink/miniblink.c
@@ -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;