Diff: targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/gpio_api.c

Revision:

0:9b334a45a8ff

Child:

50:a417edff4437

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/gpio_api.c	Thu Oct 01 15:25:22 2015 +0300
@@ -0,0 +1,138 @@
+/***************************************************************************//**
+ * @file gpio_api.c
+ *******************************************************************************
+ * @section License
+ * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b>
+ *******************************************************************************
+ *
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ *
+ * 1. The origin of this software must not be misrepresented; you must not
+ *    claim that you wrote the original software.
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ *    misrepresented as being the original software.
+ * 3. This notice may not be removed or altered from any source distribution.
+ *
+ * DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Silicon Labs has no
+ * obligation to support this Software. Silicon Labs is providing the
+ * Software "AS IS", with no express or implied warranties of any kind,
+ * including, but not limited to, any implied warranties of merchantability
+ * or fitness for any particular purpose or warranties against infringement
+ * of any proprietary rights of a third party.
+ *
+ * Silicon Labs will not be liable for any consequential, incidental, or
+ * special damages, or any other relief, or for any claim by any third party,
+ * arising from your use of this Software.
+ *
+ ******************************************************************************/
+
+#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 (obj->pin | 0xFFFFFF00 )!= (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)
+{
+        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
+            GPIO->P[(obj->pin >> 4) & 0xF].DOUTSET = 1 << (obj->pin & 0xF);
+        } else {
+            //Clear DOUT
+            GPIO->P[(obj->pin >> 4) & 0xF].DOUTCLR = 1 << (obj->pin & 0xF);
+        }
+    } 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;
+    }
+}