mirror of https://github.com/ARMmbed/mbed-os.git
54 lines
1.6 KiB
C
54 lines
1.6 KiB
C
/* mbed Microcontroller Library
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* Copyright (c) 2006-2013 ARM Limited
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "mbed_assert.h"
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#include "gpio_api.h"
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#include "pinmap.h"
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uint32_t gpio_set(PinName pin) {
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LPC_SC->SCS |= 1; // High speed GPIO is enabled on ports 0 and 1
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pin_function(pin, 0);
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return (1 << ((int)pin & 0x1F));
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}
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void gpio_init(gpio_t *obj, PinName pin) {
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if (pin == (PinName)NC)
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return;
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obj->pin = pin;
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obj->mask = gpio_set(pin);
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LPC_GPIO_TypeDef *port_reg = (LPC_GPIO_TypeDef *) ((int)pin & ~0x1F);
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obj->reg_set = &port_reg->FIOSET;
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obj->reg_clr = &port_reg->FIOCLR;
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obj->reg_in = &port_reg->FIOPIN;
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obj->reg_dir = &port_reg->FIODIR;
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}
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void gpio_mode(gpio_t *obj, PinMode mode) {
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pin_mode(obj->pin, mode);
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}
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void gpio_dir(gpio_t *obj, PinDirection direction) {
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if (obj->pin == (PinName)NC)
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return;
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switch (direction) {
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case PIN_INPUT : *obj->reg_dir &= ~obj->mask; break;
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case PIN_OUTPUT: *obj->reg_dir |= obj->mask; break;
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}
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}
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