Add Initial Support for STM32F4DISCOVERY Board

* Add a TARGET definition to Makefile (default PYBOARD).
* Add support for discovery LEDs in led module.
* Add support for discovery user switch in usersw
* Add EXTI interrupt handler for discovery user switch on (PA0).
* Parameterize led and usrsw modules pins and port.
* Issue #83

1 files changed, 5 insertions, 0 deletions

diff --git a/stm/led.h b/stm/led.h
index e6d0c30bc..fcbfa1763 100644
--- a/stm/led.h
+++ b/stm/led.h
@@ -3,6 +3,11 @@ typedef enum {
     PYB_LED_R2 = 1,
     PYB_LED_G1 = 2,
     PYB_LED_G2 = 3,
+    //STM32F4DISC
+    PYB_LED_R = 0,
+    PYB_LED_G = 1,
+    PYB_LED_B = 2,
+    PYB_LED_O = 3,
 } pyb_led_t;
 
 void led_init(void);