added a api to manage the power supplies of peripheral power supplies and level shifters

Author: mazgch

libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC176X/TARGET_UBLOX_C027/C027_api.c

@@ -0,0 +1,90 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include "gpio_api.h"
+#include "wait_api.h"
+#include "C027_api.h"
+
+static gpio_t mdmEn, mdmLvlOe, mdmILvlOe, mdmUsbDet;
+static gpio_t gpsEn;
+
+void c027_init(void)
+{
+    gpio_t led, mdmRts, mdmRst, gpsRst, mdmPwrOn;
+    // start with modem disabled 
+    gpio_init_out_ex(&mdmEn,     MDMEN,     0);
+    gpio_init_out_ex(&mdmRst,    MDMRST,    1);
+    gpio_init_out_ex(&mdmPwrOn,  MDMPWRON,  1);
+    gpio_init_out_ex(&mdmLvlOe,  MDMLVLOE,  1); // LVLEN:  1=disabled
+    gpio_init_out_ex(&mdmILvlOe, MDMILVLOE, 0); // ILVLEN: 0=disabled
+    gpio_init_out_ex(&mdmUsbDet, MDMUSBDET, 0);
+    gpio_init_out_ex(&mdmRts,    MDMRTS,    0);
+    // start with gps disabled 
+    gpio_init_out_ex(&gpsEn,     GPSEN,     0);
+    gpio_init_out_ex(&gpsRst,    GPSRST,    1);
+    // led should be off
+    gpio_init_out_ex(&led,       LED,       0);
+    
+    wait_ms(50); // when USB cable is inserted the interface chip issues 
+}
+
+void c027_mdm_powerOn(int usb)
+{
+    // turn on the mode by enabling power with power on pin low and correct USB detect level
+    gpio_write(&mdmUsbDet, usb ? 1 : 0);  // USBDET: 0=disabled, 1=enabled
+    if (!gpio_read(&mdmEn)) // enable modem
+    {
+        gpio_write(&mdmEn, 1);        // LDOEN:  1=on
+        wait_ms(1);                   // wait until supply switched off
+        // now we can safely enable the level shifters
+        gpio_write(&mdmLvlOe, 0);      // LVLEN:  0=enabled (uart/gpio)
+        if (gpio_read(&gpsEn)) 
+            gpio_write(&mdmILvlOe, 1); // ILVLEN: 1=enabled (i2c)
+    }
+}
+
+void c027_mdm_powerOff(void) 
+{
+    if (gpio_read(&gpsEn))
+    {
+        // diable all level shifters
+        gpio_write(&mdmILvlOe, 0);  // ILVLEN: 0=disabled (i2c)
+        gpio_write(&mdmLvlOe, 1);   // LVLEN:  1=disabled (uart/gpio)
+        gpio_write(&mdmUsbDet, 0);  // USBDET: 0=disabled
+        // now we can savely switch off the ldo
+        gpio_write(&mdmEn, 0);      // LDOEN:  0=off
+    }
+}        
+
+void c027_gps_powerOn(void)
+{
+    if (!gpio_read(&gpsEn))
+    {
+        // switch on power supply
+        gpio_write(&gpsEn, 1);          // LDOEN: 1=on
+        wait_ms(1);                     // wait until supply switched off
+        if (gpio_read(&mdmEn)) 
+            gpio_write(&mdmILvlOe, 1);  // ILVLEN: 1=enabled (i2c)
+    }
+}
+
+void c027_gps_powerOff(void)
+{
+    if (gpio_read(&gpsEn))
+    {
+        gpio_write(&mdmILvlOe, 0);  // ILVLEN: 0=disabled (i2c)
+        gpio_write(&gpsEn, 0);      // LDOEN: 0=off
+    }
+}

libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC176X/TARGET_UBLOX_C027/C027_api.h

@@ -0,0 +1,22 @@
+#ifndef C027_H
+#define C027_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void c027_init(void);
+
+void c027_mdm_powerOn(int usb);
+
+void c027_mdm_powerOff(void);
+
+void c027_gps_powerOn(void);
+
+void c027_gps_powerOff(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // C027_H

libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC176X/TARGET_UBLOX_C027/mbed_overrides.c

@@ -13,31 +13,10 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-#include "gpio_api.h"
-#include "wait_api.h"
+#include "C027_api.h"
 
 // called before main
 void mbed_sdk_init()
 {
-    gpio_t modemEn, modemRst, modemPwrOn, modemLvlOe, modemILvlOe, modemUsbDet;
-    gpio_t gpsEn, gpsRst, led, modemRts;
-    
-    // start with modem disabled 
-    gpio_init_out_ex(&modemEn,     MDMEN,     0);
-    gpio_init_out_ex(&modemRst,    MDMRST,    1);
-    gpio_init_out_ex(&modemPwrOn,  MDMPWRON,  1);
-    gpio_init_out_ex(&modemLvlOe,  MDMLVLOE,  1);
-    gpio_init_out_ex(&modemILvlOe, MDMILVLOE, 0);
-    gpio_init_out_ex(&modemUsbDet, MDMUSBDET, 0);
-    gpio_init_out_ex(&modemRts,    MDMRTS,    0);
-    // start with gps disabled 
-    gpio_init_out_ex(&gpsEn,       GPSEN,     0);
-    gpio_init_out_ex(&gpsRst,      GPSRST,    1);
-    // led should be off
-    gpio_init_out_ex(&led,         LED,       0);
-    
-    wait_ms(50); // when USB cable is inserted the interface chip issues 
-    // multiple resets to the target CPU We wait here for a short period to 
-    // prevent those resets from propagating to the modem and other 
-    // components. 
+	c027_init();
 }