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authorUwe Hermann2011-01-03 01:12:07 +0100
committerUwe Hermann2011-01-03 01:12:07 +0100
commitca53311bfc3182212d53386c5f49f0bc57350266 (patch)
tree2a81b20c486717d0fea3d1987549c15d2bb529b2 /examples/stm32/stm32-h103/usart
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/usart')
-rw-r--r--examples/stm32/stm32-h103/usart/usart.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/examples/stm32/stm32-h103/usart/usart.c b/examples/stm32/stm32-h103/usart/usart.c
index c3d24ca..487ee84 100644
--- a/examples/stm32/stm32-h103/usart/usart.c
+++ b/examples/stm32/stm32-h103/usart/usart.c
@@ -69,13 +69,14 @@ int main(void)
/* Blink the LED (PC12) on the board with every transmitted byte. */
while (1) {
gpio_toggle(GPIOC, GPIO12); /* LED on/off */
- usart_send_blocking(USART3, c + '0'); /* Send one byte on USART3. */
+ usart_send_blocking(USART3, c + '0'); /* USART3: Send byte. */
c = (c == 9) ? 0 : c + 1; /* Increment c. */
if ((j++ % 80) == 0) { /* Newline after line full. */
usart_send_blocking(USART3, '\r');
usart_send_blocking(USART3, '\n');
}
- for (i = 0; i < 80000; i++); /* Wait (needs -O0 CFLAGS). */
+ for (i = 0; i < 800000; i++) /* Wait a bit. */
+ __asm__("NOP");
}
return 0;