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cc2538: gpio: Fix missed interrupts

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Only the interrupt flags that have been handled must be cleared.
Otherwise, if a new interrupt occurs after the interrupt statuses are
read and before they are cleared, then it is discarded without having
been handled. This issue was particularly likely with two interrupt
trigger conditions occurring on different pins of the same port in a
short period of time.

Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau.dev@gmail.com>
This commit is contained in:
Benoît Thébaudeau 2015-04-09 00:55:04 +02:00
parent 1a5632cba0
commit 3d9d52de87
1 changed files with 6 additions and 4 deletions
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10
cpu/cc2538/dev/gpio.c
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@ -86,18 +86,20 @@ static void
gpio_port_isr(uint8_t port)
{
uint32_t base;
uint8_t int_status, power_up_int_status;
lpm_exit();
ENERGEST_ON(ENERGEST_TYPE_IRQ);
base = GPIO_PORT_TO_BASE(port);
int_status = GPIO_GET_MASKED_INT_STATUS(base);
power_up_int_status = GPIO_GET_POWER_UP_INT_STATUS(port);
notify(GPIO_GET_MASKED_INT_STATUS(base) | GPIO_GET_POWER_UP_INT_STATUS(port),
port);
notify(int_status | power_up_int_status, port);
GPIO_CLEAR_INTERRUPT(base, 0xFF);
GPIO_CLEAR_POWER_UP_INTERRUPT(port, 0xFF);
GPIO_CLEAR_INTERRUPT(base, int_status);
GPIO_CLEAR_POWER_UP_INTERRUPT(port, power_up_int_status);
ENERGEST_OFF(ENERGEST_TYPE_IRQ);
}