From 95ea4f0c95a6d08215dbfd0705747c1f8480ef10 Mon Sep 17 00:00:00 2001
From: Damien George <damien.p.george@gmail.com>
Date: Wed, 6 Aug 2014 16:04:57 +0100
Subject: [PATCH] stmhal: Enable relevant GPIO clock when Pin obj is init'd.

---
 stmhal/pin.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/stmhal/pin.c b/stmhal/pin.c
index 2d7466d3cb..f71ca92d9c 100644
--- a/stmhal/pin.c
+++ b/stmhal/pin.c
@@ -285,6 +285,32 @@ STATIC mp_obj_t pin_obj_init(uint n_args, mp_obj_t *args) {
         }
     }
 
+    // enable the peripheral clock for the port of this pin
+    switch (self->port) {
+        case PORT_A: __GPIOA_CLK_ENABLE(); break;
+        case PORT_B: __GPIOB_CLK_ENABLE(); break;
+        case PORT_C: __GPIOC_CLK_ENABLE(); break;
+        case PORT_D: __GPIOD_CLK_ENABLE(); break;
+        #ifdef __GPIOE_CLK_ENABLE
+        case PORT_E: __GPIOE_CLK_ENABLE(); break;
+        #endif
+        #ifdef __GPIOF_CLK_ENABLE
+        case PORT_F: __GPIOF_CLK_ENABLE(); break;
+        #endif
+        #ifdef __GPIOG_CLK_ENABLE
+        case PORT_G: __GPIOG_CLK_ENABLE(); break;
+        #endif
+        #ifdef __GPIOH_CLK_ENABLE
+        case PORT_H: __GPIOH_CLK_ENABLE(); break;
+        #endif
+        #ifdef __GPIOI_CLK_ENABLE
+        case PORT_I: __GPIOI_CLK_ENABLE(); break;
+        #endif
+        #ifdef __GPIOJ_CLK_ENABLE
+        case PORT_J: __GPIOJ_CLK_ENABLE(); break;
+        #endif
+    }
+
     // configure the GPIO as requested
     GPIO_InitTypeDef GPIO_InitStructure;
     GPIO_InitStructure.Pin = self->pin_mask;