From 711dc06ec6d58a772950fb2852c1461a792c0342 Mon Sep 17 00:00:00 2001
From: Marti Bolivar <mbolivar@leaflabs.com>
Date: Wed, 3 Aug 2011 12:39:03 -0400
Subject: exti.c: Remove enable_irq() and maybe_disable_irq().

These functions incorrectly replicate functionality that is already
accomplished by manipulating EXTI_IMR directly.
---
 libmaple/exti.c | 37 +------------------------------------
 1 file changed, 1 insertion(+), 36 deletions(-)

diff --git a/libmaple/exti.c b/libmaple/exti.c
index a3a2db7..0678d4c 100644
--- a/libmaple/exti.c
+++ b/libmaple/exti.c
@@ -38,10 +38,6 @@
  * Internal state
  */
 
-/* Status bitmaps, for external interrupts with multiplexed IRQs */
-static uint16 exti_9_5_en = 0;
-static uint16 exti_15_10_en = 0;
-
 typedef struct exti_channel {
     void (*handler)(void);
     uint32 irq_line;
@@ -70,9 +66,6 @@ static exti_channel exti_channels[] = {
  * Convenience routines
  */
 
-static inline void enable_irq(afio_exti_num exti_num);
-static inline void maybe_disable_irq(afio_exti_num exti_num);
-
 /**
  * @brief Register a handler to run upon external interrupt.
  *
@@ -118,7 +111,7 @@ void exti_attach_interrupt(afio_exti_num num,
     bb_peri_set_bit(&EXTI_BASE->IMR, num, 1);
 
     /* Enable the interrupt line */
-    enable_irq(num);
+    nvic_irq_enable(exti_channels[num].irq_line);
 }
 
 /**
@@ -134,10 +127,6 @@ void exti_detach_interrupt(afio_exti_num num) {
     bb_peri_set_bit(&EXTI_BASE->FTSR, num, 0);
     bb_peri_set_bit(&EXTI_BASE->RTSR, num, 0);
 
-    /* Next, disable the IRQ, unless it's multiplexed and there are
-     * other active external interrupts on the same IRQ line */
-    maybe_disable_irq(num);
-
     /* Finally, unregister the user's handler */
     exti_channels[num].handler = NULL;
 }
@@ -223,27 +212,3 @@ static inline void dispatch_handler(uint32 exti_num) {
 static inline void clear_pending(uint32 exti_num) {
     EXTI_BASE->PR = 1 << exti_num;
 }
-
-static inline void enable_irq(afio_exti_num exti) {
-    /* Maybe twiddle the IRQ bitmap for extis with multiplexed IRQs */
-    if (exti > 4) {
-        uint16 *bitmap = exti < 10 ? &exti_9_5_en : &exti_15_10_en;
-        *bb_sramp(bitmap, exti) = 1;
-    }
-
-    nvic_irq_enable(exti_channels[exti].irq_line);
-}
-
-static inline void maybe_disable_irq(afio_exti_num exti) {
-    if (exti > 4) {
-        uint16 *bitmap = exti < 10 ? &exti_9_5_en : &exti_15_10_en;
-        *bb_sramp(bitmap, exti) = 0;
-        if (*bitmap == 0) {
-            /* All of the external interrupts which share this IRQ
-             * line are disabled. */
-            nvic_irq_disable(exti_channels[exti].irq_line);
-        }
-    } else {
-        nvic_irq_disable(exti_channels[exti].irq_line);
-    }
-}
-- 
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