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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 "mbed_assert.h"
#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) {
obj->pin = pin;
if (pin == (PinName)NC)
return;
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;
}
void gpio_mode(gpio_t *obj, PinMode mode) {
pin_mode(obj->pin, mode);
}
void gpio_dir(gpio_t *obj, PinDirection direction) {
MBED_ASSERT(obj->pin != (PinName)NC);
switch (direction) {
case PIN_INPUT :
*obj->reg_dir &= ~obj->mask;
break;
case PIN_OUTPUT:
*obj->reg_dir |= obj->mask;
break;
}
}
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