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/* 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
}
}
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