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EXTI bugfix in exti_select_source().

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AFIO_EXTICR[1 to 4] registers were not beeing set correctly. You have to
force a 0 on the bits that are 0 for the mutex to work.

Thanks Linus Casassa <linus@lin.cl> for the patch!
This commit is contained in:
Uwe Hermann 2011-01-07 17:07:25 +01:00
parent ca53311bfc
commit 1cabc38c3a
1 changed files with 13 additions and 8 deletions
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21
lib/stm32/exti.c
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@ -129,12 +129,17 @@ void exti_select_source(u32 exti, u32 gpioport)
}
/* Ensure that only valid EXTI lines are used. */
if (exti < EXTI4)
AFIO_EXTICR1 &= ~(bits << shift);
else if (exti < EXTI8)
AFIO_EXTICR2 &= ~(bits << shift);
else if (exti < EXTI12)
AFIO_EXTICR3 &= ~(bits << shift);
else if (exti < EXTI16)
AFIO_EXTICR4 &= ~(bits << shift);
if (exti < EXTI4) {
AFIO_EXTICR1 &= ~(0x000F << shift);
AFIO_EXTICR1 |= (~bits << shift);
} else if (exti < EXTI8) {
AFIO_EXTICR2 &= ~(0x000F << shift);
AFIO_EXTICR2 |= (~bits << shift);
} else if (exti < EXTI12) {
AFIO_EXTICR3 &= ~(0x000F << shift);
AFIO_EXTICR3 |= (~bits << shift);
} else if (exti < EXTI16) {
AFIO_EXTICR4 &= ~(0x000F << shift);
AFIO_EXTICR4 |= (~bits << shift);
}
}