mirror of https://github.com/ARMmbed/mbed-os.git
151 lines
4.2 KiB
C
151 lines
4.2 KiB
C
/* mbed Microcontroller Library
|
|
* Copyright (c) 2015-2020 Nuvoton
|
|
*
|
|
* 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 "mbed_assert.h"
|
|
#include "pinmap.h"
|
|
#include "mbed_error.h"
|
|
#include "PeripheralPins.h"
|
|
|
|
uint32_t gpio_set(PinName pin)
|
|
{
|
|
if (pin == (PinName) NC) {
|
|
return 0;
|
|
}
|
|
|
|
uint32_t pin_index = NU_PINNAME_TO_PIN(pin);
|
|
|
|
#if 1
|
|
pin_function(pin, 0 << NU_MFP_POS(pin_index));
|
|
#else
|
|
pinmap_pinout(pin, PinMap_GPIO);
|
|
#endif
|
|
|
|
return (uint32_t)(1 << pin_index); // Return the pin mask
|
|
}
|
|
|
|
int gpio_is_connected(const gpio_t *obj)
|
|
{
|
|
return (obj->pin != (PinName) NC);
|
|
}
|
|
|
|
void gpio_init(gpio_t *obj, PinName pin)
|
|
{
|
|
obj->pin = pin;
|
|
|
|
if (obj->pin == (PinName) NC) {
|
|
return;
|
|
}
|
|
|
|
obj->mask = gpio_set(pin);
|
|
/* Default mode/direction */
|
|
obj->mode = PullUp;
|
|
obj->direction = PIN_INPUT;
|
|
}
|
|
|
|
void gpio_mode(gpio_t *obj, PinMode mode)
|
|
{
|
|
if (obj->pin == (PinName) NC) {
|
|
return;
|
|
}
|
|
|
|
switch (mode) {
|
|
case PullNone:
|
|
case PullDown:
|
|
case PullUp:
|
|
/* H/W doesn't support separate configuration for input pull mode/direction.
|
|
* We translate to input-only/push-pull output I/O mode dependent on direction. */
|
|
obj->mode = (obj->direction == PIN_INPUT) ? InputOnly : PushPullOutput;
|
|
break;
|
|
|
|
case QuasiBidirectional:
|
|
/* With quasi-bidirectional I/O mode, before digital input function is performed,
|
|
* the corresponding bit in GPIOx_DOUT must be set to 1. */
|
|
obj->mode = QuasiBidirectional;
|
|
if (obj->direction == PIN_INPUT) {
|
|
gpio_write(obj, 1);
|
|
}
|
|
break;
|
|
|
|
case InputOnly:
|
|
case PushPullOutput:
|
|
/* We may meet contradictory I/O mode/direction configuration. Favor I/O mode
|
|
* in the gpio_mode call here. */
|
|
if (mode == InputOnly) {
|
|
obj->direction = PIN_INPUT;
|
|
obj->mode = InputOnly;
|
|
} else {
|
|
obj->direction = PIN_OUTPUT;
|
|
obj->mode = PushPullOutput;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
/* Allow for configuring other I/O modes directly */
|
|
obj->mode = mode;
|
|
break;
|
|
}
|
|
|
|
pin_mode(obj->pin, obj->mode);
|
|
}
|
|
|
|
void gpio_dir(gpio_t *obj, PinDirection direction)
|
|
{
|
|
if (obj->pin == (PinName) NC) {
|
|
return;
|
|
}
|
|
|
|
obj->direction = direction;
|
|
|
|
switch (obj->mode) {
|
|
case PullNone:
|
|
case PullDown:
|
|
case PullUp:
|
|
/* H/W doesn't support separate configuration for input pull mode/direction.
|
|
* We translate to input-only/push-pull output I/O mode dependent on direction. */
|
|
obj->mode = (obj->direction == PIN_INPUT) ? InputOnly : PushPullOutput;
|
|
break;
|
|
|
|
case QuasiBidirectional:
|
|
/* With quasi-bidirectional I/O mode, before digital input function is performed,
|
|
* the corresponding bit in GPIOx_DOUT must be set to 1. */
|
|
if (obj->direction == PIN_INPUT) {
|
|
gpio_write(obj, 1);
|
|
}
|
|
break;
|
|
|
|
case InputOnly:
|
|
case PushPullOutput:
|
|
/* We may meet contradictory I/O mode/direction configuration. Favor direction
|
|
* in the gpio_dir call here. */
|
|
obj->mode = (obj->direction == PIN_INPUT) ? InputOnly : PushPullOutput;
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
pin_mode(obj->pin, obj->mode);
|
|
}
|
|
|
|
void gpio_get_capabilities(gpio_t *obj, gpio_capabilities_t *cap)
|
|
{
|
|
// Pull modes not supported.
|
|
cap->pull_none = 0;
|
|
cap->pull_down = 0;
|
|
cap->pull_up = 0;
|
|
}
|