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Fix wrapping issue with tick_blink #194

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Fix wrapping issue with tick_blink #194

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8 changes: 6 additions & 2 deletions examples/stm32/f4/stm32f4-discovery/tick_blink/tick_blink.c
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Original file line number Diff line number Diff line change
Expand Up @@ -31,18 +31,22 @@
* overflows every 49 days if you're wondering
*/
volatile uint32_t system_millis;
volatile uint32_t delay_millis;

/* Called when systick fires */
void sys_tick_handler(void)
{
system_millis++;
if (delay_millis != 0) {
delay_millis--;
}
}

/* sleep for delay milliseconds */
static void msleep(uint32_t delay)
{
uint32_t wake = system_millis + delay;
while (wake > system_millis);
delay_millis = delay;
while (delay_millis);
}

/* Set up a timer to create 1mS ticks. */
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