/* 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(&mdmEn)) { // 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 } }