Revert "Merge pull request #265 from cfb95/patch-1"

This reverts commit 6b9fca1, reversing
changes made to c9167e8.

Author: Bogdan Marinescu

libraries/mbed/targets/hal/TARGET_STM/TARGET_DISCO_F100RB/gpio_irq_api.c

@@ -39,19 +39,19 @@
 #define EDGE_FALL (2)
 #define EDGE_BOTH (3)
 
-#define CHANNEL_NUM (7)
+#define CHANNEL_NUM (4)
 
-static uint32_t channel_ids[CHANNEL_NUM]  = {0, 0, 0, 0, 0, 0, 0};
-static uint32_t channel_gpio[CHANNEL_NUM] = {0, 0, 0, 0, 0, 0, 0};
-static uint32_t channel_pin[CHANNEL_NUM]  = {0, 0, 0, 0, 0, 0, 0};
+static uint32_t channel_ids[CHANNEL_NUM]  = {0, 0, 0, 0};
+static uint32_t channel_gpio[CHANNEL_NUM] = {0, 0, 0, 0};
+static uint32_t channel_pin[CHANNEL_NUM]  = {0, 0, 0, 0};
 
 static gpio_irq_handler irq_handler;
 
 static void handle_interrupt_in(uint32_t irq_index) {
     // Retrieve the gpio and pin that generate the irq
     GPIO_TypeDef *gpio = (GPIO_TypeDef *)(channel_gpio[irq_index]);
     uint32_t pin = (uint32_t)(1 << channel_pin[irq_index]);
-
+     
     // Clear interrupt flag
     if (EXTI_GetITStatus(pin) != RESET)
     {
@@ -70,13 +70,10 @@ static void handle_interrupt_in(uint32_t irq_index) {
 }
 
 // The irq_index is passed to the function
-static void gpio_irq0(void) {handle_interrupt_in(0);} // EXTI line 0
-static void gpio_irq1(void) {handle_interrupt_in(1);} // EXTI line 1
-static void gpio_irq2(void) {handle_interrupt_in(2);} // EXTI line 2
-static void gpio_irq3(void) {handle_interrupt_in(3);} // EXTI line 3
-static void gpio_irq4(void) {handle_interrupt_in(4);} // EXTI line 4
-static void gpio_irq5(void) {handle_interrupt_in(5);} // EXTI lines 5 to 9
-static void gpio_irq6(void) {handle_interrupt_in(6);} // EXTI lines 10 to 15
+static void gpio_irq0(void) {handle_interrupt_in(0);}
+static void gpio_irq1(void) {handle_interrupt_in(1);}
+static void gpio_irq2(void) {handle_interrupt_in(2);}
+static void gpio_irq3(void) {handle_interrupt_in(3);}
 
 extern uint32_t Set_GPIO_Clock(uint32_t port_idx);
 
@@ -91,53 +88,29 @@ int gpio_irq_init(gpio_irq_t *obj, PinName pin, gpio_irq_handler handler, uint32
     uint32_t pin_index  = STM_PIN(pin);
 
     // Select irq number and interrupt routine
-    switch (pin_index) {
-        case 0:
-            irq_n = EXTI0_IRQn;
+    switch (pin) {
+        case PC_13: // User button
+            irq_n = EXTI15_10_IRQn;
             vector = (uint32_t)&gpio_irq0;
             irq_index = 0;
             break;
-        case 1:
-            irq_n = EXTI1_IRQn;
+        case PB_3:
+            irq_n = EXTI3_IRQn;
             vector = (uint32_t)&gpio_irq1;
             irq_index = 1;
             break;
-        case 2:
-            irq_n = EXTI2_IRQn;
+        case PB_4:
+            irq_n = EXTI4_IRQn;
             vector = (uint32_t)&gpio_irq2;
             irq_index = 2;
             break;
-        case 3:
-            irq_n = EXTI3_IRQn;
+        case PB_5:
+            irq_n = EXTI9_5_IRQn;
             vector = (uint32_t)&gpio_irq3;
             irq_index = 3;
             break;
-        case 4:
-            irq_n = EXTI4_IRQn;
-            vector = (uint32_t)&gpio_irq4;
-            irq_index = 4;
-            break;
-        case 5:
-        case 6:
-        case 7:
-        case 8:
-        case 9:
-            irq_n = EXTI9_5_IRQn;
-            vector = (uint32_t)&gpio_irq5;
-            irq_index = 5;
-            break;
-        case 10:
-        case 11:
-        case 12:
-        case 13:
-        case 14:
-        case 15:
-            irq_n = EXTI15_10_IRQn;
-            vector = (uint32_t)&gpio_irq6;
-            irq_index = 6;
-            break;
         default:
-            error("InterruptIn error: pin not supported.\n");
+            error("This pin is not supported with InterruptIn.");
             return -1;
     }