Diff: targets/TARGET_NXP/TARGET_LPC176X/TARGET_UBLOX_C027/ublox_low_level_api.c

Revision:

167:e84263d55307

Child:

186:707f6e361f3e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_NXP/TARGET_LPC176X/TARGET_UBLOX_C027/ublox_low_level_api.c	Wed Jun 21 17:46:44 2017 +0100
@@ -0,0 +1,109 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2017 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 <stdbool.h>
+#include "hal/us_ticker_api.h"
+#include "platform/mbed_wait_api.h"
+#include "gpio_api.h"
+#include "ublox_low_level_api.h"
+
+static bool modemOn;
+static bool gpsOn;
+
+void ublox_mdm_init(void)
+{
+    gpio_t gpio;
+    // start with modem disabled 
+    gpio_init_out_ex(&gpio, MDMEN,     0);
+    gpio_init_out_ex(&gpio, MDMRST,    1);
+    gpio_init_out_ex(&gpio, MDMPWRON,  1);
+    gpio_init_out_ex(&gpio, MDMLVLOE,  1); // LVLEN:  1=disabled
+    gpio_init_out_ex(&gpio, MDMILVLOE, 0); // ILVLEN: 0=disabled
+    gpio_init_out_ex(&gpio, MDMUSBDET, 0);
+    gpio_init_out_ex(&gpio, MDMRTS,    0);
+    // start with gps disabled 
+    gpio_init_out_ex(&gpio, GPSEN,     0);
+    gpio_init_out_ex(&gpio, GPSRST,    1);
+    // led should be off
+    gpio_init_out_ex(&gpio, LED,       0);
+    
+    // Can't use wait_ms() as RTOS isn't initialised yet
+    //wait_ms(50); // when USB cable is inserted the interface chip issues
+    // Here's the code from the non-RTOS version
+    uint32_t start = us_ticker_read();
+    while ((us_ticker_read() - start) < 50000);
+}
+
+// For forwards compatibility
+void ublox_mdm_power_on(int usb)
+{
+    ublox_mdm_powerOn(usb);
+}
+
+void ublox_mdm_powerOn(int usb)
+{
+    gpio_t gpio;
+    // turn on the mode by enabling power with power on pin low and correct USB detect level
+    gpio_init_out_ex(&gpio, MDMUSBDET,  usb ? 1 : 0);  // USBDET: 0=disabled, 1=enabled
+    if (!modemOn) { // enable modem
+        gpio_init_out_ex(&gpio, MDMEN, 1);        // LDOEN:  1=on
+        wait_ms(1);                   // wait until supply switched off
+        // now we can safely enable the level shifters
+        gpio_init_out_ex(&gpio, MDMLVLOE, 0);      // LVLEN:  0=enabled (uart/gpio)
+        if (gpsOn)
+            gpio_init_out_ex(&gpio, MDMILVLOE, 1); // ILVLEN: 1=enabled (i2c)
+    }
+}
+
+// For forwards compatibility
+void ublox_mdm_power_off()
+{
+    ublox_mdm_powerOff();
+}
+
+void ublox_mdm_powerOff(void)
+{
+    gpio_t gpio;
+    if (modemOn) {
+        // diable all level shifters
+        gpio_init_out_ex(&gpio, MDMILVLOE, 0);  // ILVLEN: 0=disabled (i2c)
+        gpio_init_out_ex(&gpio, MDMLVLOE, 1);   // LVLEN:  1=disabled (uart/gpio)
+        gpio_init_out_ex(&gpio,MDMUSBDET, 0);  // USBDET: 0=disabled
+        // now we can savely switch off the ldo
+        gpio_init_out_ex(&gpio, MDMEN, 0);      // LDOEN:  0=off
+        modemOn = false;
+    }
+}        
+
+void ublox_gps_powerOn(void)
+{
+    gpio_t gpio;
+    if (!gpsOn) {
+        // switch on power supply
+        gpio_init_out_ex(&gpio, GPSEN, 1);          // LDOEN: 1=on
+        wait_ms(1);                     // wait until supply switched off
+        if (modemOn)
+            gpio_init_out_ex(&gpio, MDMILVLOE, 1);  // ILVLEN: 1=enabled (i2c)
+    }
+}
+
+void ublox_gps_powerOff(void)
+{
+    gpio_t gpio;
+    if (gpsOn) {
+        gpio_init_out_ex(&gpio, MDMILVLOE, 0);   // ILVLEN: 0=disabled (i2c)
+        gpio_init_out_ex(&gpio, GPSEN, 0);       // LDOEN: 0=off
+    }
+}