Diff: vendor/NXP/LPC812/hal/gpio_api.c

Revision:

10:3bc89ef62ce7

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vendor/NXP/LPC812/hal/gpio_api.c	Fri Jun 14 17:49:17 2013 +0100
@@ -0,0 +1,69 @@
+/* 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 "pinmap.h"
+
+static int  gpio_enabled = 0;
+static void gpio_enable(void) {
+    gpio_enabled = 1;
+    
+    /* Enable AHB clock to the GPIO domain. */
+    LPC_SYSCON->SYSAHBCLKCTRL |= (1<<6);
+    
+    /* Peripheral reset control to GPIO and GPIO INT, a "1" bring it out of reset. */
+    LPC_SYSCON->PRESETCTRL &= ~(0x1<<10);
+    LPC_SYSCON->PRESETCTRL |=  (0x1<<10);
+}
+
+uint32_t gpio_set(PinName pin) {
+    int f = 0;
+    
+    if (!gpio_enabled)
+         gpio_enable();
+    
+    pin_function(pin, f);
+    
+    return (1 << ((int)pin & 0x1F));
+}
+
+void gpio_init(gpio_t *obj, PinName pin, PinDirection direction) {
+    if(pin == NC) return;
+    
+    obj->pin = pin;
+    obj->mask = gpio_set(pin);
+    
+    obj->reg_set = &LPC_GPIO_PORT->SET0;
+    obj->reg_clr = &LPC_GPIO_PORT->CLR0;
+    obj->reg_in  = &LPC_GPIO_PORT->PIN0;
+    obj->reg_dir = &LPC_GPIO_PORT->DIR0;
+    
+    gpio_dir(obj, direction);
+    switch (direction) {
+        case PIN_OUTPUT: pin_mode(pin, PullNone); break;
+        case PIN_INPUT : pin_mode(pin, PullDown); break;
+    }
+}
+
+void gpio_mode(gpio_t *obj, PinMode mode) {
+    pin_mode(obj->pin, mode);
+}
+
+void gpio_dir(gpio_t *obj, PinDirection direction) {
+    switch (direction) {
+        case PIN_INPUT : *obj->reg_dir &= ~obj->mask; break;
+        case PIN_OUTPUT: *obj->reg_dir |=  obj->mask; break;
+    }
+}