Diff: mbed-dev/targets/TARGET_Silicon_Labs/TARGET_EFM32/gpio_api.c

Revision:

18:6a4db94011d3

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-dev/targets/TARGET_Silicon_Labs/TARGET_EFM32/gpio_api.c	Sun May 14 23:18:57 2017 +0000
@@ -0,0 +1,142 @@
+/***************************************************************************//**
+ * @file gpio_api.c
+ *******************************************************************************
+ * @section License
+ * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b>
+ *******************************************************************************
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * 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 "pinmap.h"
+#include "em_cmu.h"
+#include "mbed_assert.h"
+#include "sleepmodes.h"
+
+
+void gpio_write(gpio_t *obj, int value)
+{
+    if (value) {
+        GPIO_PinOutSet((GPIO_Port_TypeDef)(obj->pin >> 4 & 0xF), obj->pin & 0xF); // Pin number encoded in first four bits of obj->pin
+    } else {
+        GPIO_PinOutClear((GPIO_Port_TypeDef)(obj->pin >> 4 & 0xF), obj->pin & 0xF);
+    }
+}
+
+int gpio_read(gpio_t *obj)
+{
+    if (obj->dir == PIN_INPUT) {
+        return GPIO_PinInGet((GPIO_Port_TypeDef)(obj->pin >> 4 & 0xF), obj->pin & 0xF); // Pin number encoded in first four bits of obj->pin
+    } else {
+        return GPIO_PinOutGet((GPIO_Port_TypeDef)(obj->pin >> 4 & 0xF), obj->pin & 0xF);
+    }
+}
+
+int gpio_is_connected(const gpio_t *obj)
+{
+    return ((uint32_t)obj->pin | 0xFFFFFF00 ) != (uint32_t)((PinName)NC);
+}
+
+/*
+ * @return the GPIO port mask for this pin
+ * Pin and port index encoded in one uint32.
+ * First four bits represent the pin number
+ * The remaining bits represent the pin mode
+ */
+uint32_t gpio_set(PinName pin)
+{
+    return 1 << ((uint32_t) pin & 0xF);
+}
+
+void gpio_init(gpio_t *obj, PinName pin)
+{
+    MBED_ASSERT(pin != NC);
+
+    CMU_ClockEnable(cmuClock_HFPER, true);
+    CMU_ClockEnable(cmuClock_GPIO, true);
+    obj->pin = pin;
+}
+
+void gpio_mode(gpio_t *obj, PinMode mode)
+{
+    uint32_t pin = 1 << (obj->pin & 0xF);
+    uint32_t port = (obj->pin >> 4) & 0xF;
+
+    if(obj->dir == PIN_INPUT) {
+        switch(mode) {
+            case PullDefault:
+                mode = Input;
+                break;
+            case PullUp:
+                mode = InputPullUp;
+                break;
+            case PullDown:
+                mode = InputPullDown;
+                break;
+            default:
+                break;
+        }
+
+        //Handle DOUT setting
+        if((mode & 0x10) != 0) {
+            //Set DOUT
+#ifdef _GPIO_P_DOUTSET_MASK
+            GPIO->P[port].DOUTSET = pin;
+#else
+            GPIO->P[port].DOUT |= pin;
+#endif
+        } else {
+            //Clear DOUT
+#ifdef _GPIO_P_DOUTCLR_MASK
+            GPIO->P[port].DOUTCLR = pin;
+#else
+            GPIO->P[port].DOUT &= ~pin;
+#endif
+        }
+    } else {
+        switch(mode) {
+            case PullDefault:
+                mode = PushPull;
+                break;
+            case PullUp:
+                mode = WiredAndPullUp;
+                break;
+            case PullDown:
+                mode = WiredOrPullDown;
+                break;
+            default:
+                break;
+        }
+    }
+
+    obj->mode = mode; // Update object
+    pin_mode(obj->pin, mode); // Update register
+}
+
+// Used by DigitalInOut to set correct mode when direction is set
+void gpio_dir(gpio_t *obj, PinDirection direction)
+{
+    obj->dir = direction;
+    switch (direction) {
+        case PIN_INPUT:
+            gpio_mode(obj, PullDefault);
+            break;
+        case PIN_OUTPUT:
+            gpio_mode(obj, PullNone);
+            break;
+    }
+}