mirror of https://github.com/ARMmbed/mbed-os.git
143 lines
4.0 KiB
C
143 lines
4.0 KiB
C
/* mbed Microcontroller Library
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* Copyright (c) 2015-2017 Nuvoton
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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 "gpio_api.h"
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#include "mbed_assert.h"
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#include "pinmap.h"
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#include "mbed_error.h"
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#include "PeripheralPins.h"
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uint32_t gpio_set(PinName pin)
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{
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if (pin == (PinName) NC) {
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return 0;
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}
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uint32_t pin_index = NU_PINNAME_TO_PIN(pin);
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#if 1
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pin_function(pin, 0 << NU_MFP_POS(pin_index));
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#else
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pinmap_pinout(pin, PinMap_GPIO);
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#endif
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return (uint32_t)(1 << pin_index); // Return the pin mask
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}
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int gpio_is_connected(const gpio_t *obj)
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{
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return (obj->pin != (PinName) NC);
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}
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void gpio_init(gpio_t *obj, PinName pin)
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{
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obj->pin = pin;
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if (obj->pin == (PinName) NC) {
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return;
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}
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obj->mask = gpio_set(pin);
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/* Default mode/direction */
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obj->mode = PullUp;
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obj->direction = PIN_INPUT;
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}
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void gpio_mode(gpio_t *obj, PinMode mode)
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{
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if (obj->pin == (PinName) NC) {
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return;
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}
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switch (mode) {
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case PullNone:
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case PullDown:
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case PullUp:
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/* H/W doesn't support separate configuration for input pull mode/direction.
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* We translate to input-only/push-pull output I/O mode dependent on direction. */
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obj->mode = (obj->direction == PIN_INPUT) ? InputOnly : PushPullOutput;
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break;
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case QuasiBidirectional:
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/* With quasi-bidirectional I/O mode, before digital input function is performed,
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* the corresponding bit in GPIOx_DOUT must be set to 1. */
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obj->mode = QuasiBidirectional;
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if (obj->direction == PIN_INPUT) {
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gpio_write(obj, 1);
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}
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break;
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case InputOnly:
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case PushPullOutput:
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/* We may meet contradictory I/O mode/direction configuration. Favor I/O mode
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* in the gpio_mode call here. */
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if (mode == InputOnly) {
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obj->direction = PIN_INPUT;
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obj->mode = InputOnly;
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} else {
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obj->direction = PIN_OUTPUT;
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obj->mode = PushPullOutput;
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}
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break;
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default:
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/* Allow for configuring other I/O modes directly */
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obj->mode = mode;
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break;
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}
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pin_mode(obj->pin, obj->mode);
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}
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void gpio_dir(gpio_t *obj, PinDirection direction)
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{
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if (obj->pin == (PinName) NC) {
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return;
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}
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obj->direction = direction;
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switch (obj->mode) {
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case PullNone:
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case PullDown:
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case PullUp:
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/* H/W doesn't support separate configuration for input pull mode/direction.
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* We translate to input-only/push-pull output I/O mode dependent on direction. */
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obj->mode = (obj->direction == PIN_INPUT) ? InputOnly : PushPullOutput;
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break;
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case QuasiBidirectional:
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/* With quasi-bidirectional I/O mode, before digital input function is performed,
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* the corresponding bit in GPIOx_DOUT must be set to 1. */
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if (obj->direction == PIN_INPUT) {
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gpio_write(obj, 1);
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}
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break;
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case InputOnly:
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case PushPullOutput:
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/* We may meet contradictory I/O mode/direction configuration. Favor direction
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* in the gpio_dir call here. */
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obj->mode = (obj->direction == PIN_INPUT) ? InputOnly : PushPullOutput;
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break;
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default:
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break;
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}
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pin_mode(obj->pin, obj->mode);
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}
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