Merge pull request #155 from sg-/c027_lpc1768_refactor

Forgot to add this file...

Author: bogdanm

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

@@ -0,0 +1,39 @@
+
+#include "gpio_api.h"
+#include "wait_api.h"
+
+ // called before main
+void mbed_main()
+{
+    gpio_t modemEn, modemRst, modemPwrOn, modemLvlOe, modemILvlOe, modemUsbDet;
+    gpio_t gpsEn, gpsRst, led, modemRts;
+    
+    gpio_init(&modemEn, MDMEN, PIN_OUTPUT);
+    gpio_init(&modemRst, MDMRST, PIN_OUTPUT);
+    gpio_init(&modemPwrOn, MDMPWRON, PIN_OUTPUT);
+    gpio_init(&modemLvlOe, MDMLVLOE, PIN_OUTPUT);
+    gpio_init(&modemILvlOe, MDMILVLOE, PIN_OUTPUT);
+    gpio_init(&modemUsbDet, MDMUSBDET, PIN_OUTPUT);
+    gpio_init(&gpsEn, GPSEN, PIN_OUTPUT);
+    gpio_init(&gpsRst, GPSRST, PIN_OUTPUT);
+    gpio_init(&led, LED, PIN_OUTPUT);
+    gpio_init(&modemRts, MDMRTS, PIN_OUTPUT);
+    
+    gpio_write(&led, 0);  			// LED1:   0=off
+    gpio_write(&modemRts, 0);		// RTS:    0=ready to send 
+    // we start with the gps disabled
+    gpio_write(&gpsEn, 0);  		// LDOEN:  1=on,0=off
+    gpio_write(&gpsRst, 0); 		// RESET:  0=reset,1=operating
+    // we start with the modem disabled
+    gpio_write(&modemLvlOe, 1);		// LVLEN:  1=disabled (uart/gpio)
+    gpio_write(&modemILvlOe, 0);  	// ILVLEN: 0=disabled (i2c)
+    gpio_write(&modemUsbDet, 0); 	// USBDET: 0=disabled
+    gpio_write(&modemPwrOn, 1);		// PWRON:  1=idle, 0=action
+    gpio_write(&modemEn, 0);  		// LDOEN:  1=on, 0=off
+    gpio_write(&modemRst, 0);  		// RESET:  0=reset, 1=operating
+    
+    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. 
+}