tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_NXP/TARGET_LPC176X/TARGET_UBLOX_C027/C027_api.c

   1 /* mbed Microcontroller Library
   2  * Copyright (c) 2006-2013 ARM Limited
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 #include "gpio_api.h"
  17 #include "wait_api.h"
  18 #include "C027_api.h"
  19
  20 static gpio_t mdmEn, mdmLvlOe, mdmILvlOe, mdmUsbDet;
  21 static gpio_t gpsEn;
  22
  23 void c027_init(void) {
  24     gpio_t led, mdmRts, mdmRst, gpsRst, mdmPwrOn;
  25     // start with modem disabled
  26     gpio_init_out_ex(&mdmEn,     MDMEN,     0);
  27     gpio_init_out_ex(&mdmRst,    MDMRST,    1);
  28     gpio_init_out_ex(&mdmPwrOn,  MDMPWRON,  1);
  29     gpio_init_out_ex(&mdmLvlOe,  MDMLVLOE,  1); // LVLEN:  1=disabled
  30     gpio_init_out_ex(&mdmILvlOe, MDMILVLOE, 0); // ILVLEN: 0=disabled
  31     gpio_init_out_ex(&mdmUsbDet, MDMUSBDET, 0);
  32     gpio_init_out_ex(&mdmRts,    MDMRTS,    0);
  33     // start with gps disabled
  34     gpio_init_out_ex(&gpsEn,     GPSEN,     0);
  35     gpio_init_out_ex(&gpsRst,    GPSRST,    1);
  36     // led should be off
  37     gpio_init_out_ex(&led,       LED,       0);
  38
  39     wait_ms(50); // when USB cable is inserted the interface chip issues
  40 }
  41
  42 void c027_mdm_powerOn(int usb) {
  43     // turn on the mode by enabling power with power on pin low and correct USB detect level
  44     gpio_write(&mdmUsbDet, usb ? 1 : 0);  // USBDET: 0=disabled, 1=enabled
  45     if (!gpio_read(&mdmEn)) { // enable modem
  46         gpio_write(&mdmEn, 1);        // LDOEN:  1=on
  47         wait_ms(1);                   // wait until supply switched off
  48         // now we can safely enable the level shifters
  49         gpio_write(&mdmLvlOe, 0);      // LVLEN:  0=enabled (uart/gpio)
  50         if (gpio_read(&gpsEn))
  51             gpio_write(&mdmILvlOe, 1); // ILVLEN: 1=enabled (i2c)
  52     }
  53 }
  54
  55 void c027_mdm_powerOff(void) {
  56     if (gpio_read(&mdmEn)) {
  57         // diable all level shifters
  58         gpio_write(&mdmILvlOe, 0);  // ILVLEN: 0=disabled (i2c)
  59         gpio_write(&mdmLvlOe, 1);   // LVLEN:  1=disabled (uart/gpio)
  60         gpio_write(&mdmUsbDet, 0);  // USBDET: 0=disabled
  61         // now we can savely switch off the ldo
  62         gpio_write(&mdmEn, 0);      // LDOEN:  0=off
  63     }
  64 }
  65
  66 void c027_gps_powerOn(void) {
  67     if (!gpio_read(&gpsEn)) {
  68         // switch on power supply
  69         gpio_write(&gpsEn, 1);          // LDOEN: 1=on
  70         wait_ms(1);                     // wait until supply switched off
  71         if (gpio_read(&mdmEn))
  72             gpio_write(&mdmILvlOe, 1);  // ILVLEN: 1=enabled (i2c)
  73     }
  74 }
  75
  76 void c027_gps_powerOff(void) {
  77     if (gpio_read(&gpsEn)) {
  78         gpio_write(&mdmILvlOe, 0);  // ILVLEN: 0=disabled (i2c)
  79         gpio_write(&gpsEn, 0);      // LDOEN: 0=off
  80     }
  81 }