From c2822a5d8f45c1d52d3efb671a99a8f4fecae35c Mon Sep 17 00:00:00 2001
From: Richard Meadows <richardeoin@gmail.com>
Date: Thu, 8 Oct 2015 21:33:18 +0100
Subject: [PATCH] Added GPS reset code

---
 firmware/inc/gps.h  |  1 +
 firmware/src/gps.c  | 32 ++++++++++++++++++++++++++++++++
 firmware/src/init.c |  1 +
 3 files changed, 34 insertions(+)

diff --git a/firmware/inc/gps.h b/firmware/inc/gps.h
index 6fe3f1f..d8935b3 100644
--- a/firmware/inc/gps.h
+++ b/firmware/inc/gps.h
@@ -48,6 +48,7 @@ uint8_t gps_is_locked(void);
 void gps_set_powersave_auto(void);
 
 void gps_usart_init_enable(uint32_t baud_rate);
+void gps_reset(void);
 void gps_init(void);
 void usart_loopback_test(void);
 
diff --git a/firmware/src/gps.c b/firmware/src/gps.c
index 431f74e..83de780 100644
--- a/firmware/src/gps.c
+++ b/firmware/src/gps.c
@@ -28,6 +28,7 @@
 
 #include "hw_config.h"
 #include "system/system.h"
+#include "system/port.h"
 #include "system/interrupt.h"
 #include "sercom/sercom.h"
 #include "sercom/usart.h"
@@ -503,11 +504,42 @@ void gps_usart_init_enable(uint32_t baud_rate)
   usart_enable(GPS_SERCOM);
 }
 
+/**
+ * GPS reset pin
+ */
+void gps_reset_on(void)
+{
+#ifdef GPS_RESET_PIN
+  port_pin_set_output_level(GPS_RESET_PIN, 0); /* active low */
+#endif
+}
+void gps_reset_off(void)
+{
+#ifdef GPS_RESET_PIN
+  port_pin_set_output_level(GPS_RESET_PIN, 1); /* active low */
+#endif
+}
+/**
+ * Reset. Places the GPS in a RESET state
+ */
+void gps_reset(void)
+{
+#ifdef GPS_RESET_PIN
+  port_pin_set_config(GPS_RESET_PIN,
+		      PORT_PIN_DIR_OUTPUT,	/* Direction */
+		      PORT_PIN_PULL_NONE,	/* Pull */
+		      false);			/* Powersave */
+  port_pin_set_output_level(GPS_RESET_PIN, 0);	/* active low */
+#endif
+}
 /**
  * Init
  */
 void gps_init(void)
 {
+  /* Bring GPS out of reset */
+  gps_reset_on();
+
   /* Enable usart */
   gps_usart_init_enable(GPS_BAUD_RATE);
 
diff --git a/firmware/src/init.c b/firmware/src/init.c
index d44f788..60a93c7 100644
--- a/firmware/src/init.c
+++ b/firmware/src/init.c
@@ -75,6 +75,7 @@ void init(timepulse_callback_t callback, enum init_type init_t)
    * --------------------------------------------------------------------------
    */
   led_reset();
+  gps_reset();
   si_trx_shutdown();
 
   /**