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Avoid using initialialised pointer in sonar interrupt handler.

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This commit is contained in:
Dominic Clifton 2014-08-13 16:24:20 +01:00
parent 98e51fb2dc
commit 6ff9483425
1 changed files with 4 additions and 2 deletions
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6
src/main/drivers/sonar_hcsr04.c
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@ -43,7 +43,7 @@ static uint8_t exti_pin_source;
static IRQn_Type exti_irqn; static IRQn_Type exti_irqn;
static uint32_t last_measurement; static uint32_t last_measurement;
static volatile int32_t *distance_ptr; static volatile int32_t *distance_ptr = 0;
void ECHO_EXTI_IRQHandler(void) void ECHO_EXTI_IRQHandler(void)
{ {
@ -64,7 +64,9 @@ void ECHO_EXTI_IRQHandler(void)
if (distance > 300) if (distance > 300)
distance = -1; distance = -1;
*distance_ptr = distance; if (distance_ptr) {
*distance_ptr = distance;
}
} }
} }