mirror of https://github.com/ARMmbed/mbed-os.git
121 lines
3.1 KiB
C
121 lines
3.1 KiB
C
/* mbed Microcontroller Library
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* Copyright (c) 2018 GigaDevice Semiconductor Inc.
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*
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* SPDX-License-Identifier: Apache-2.0
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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 "port_api.h"
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#include "pinmap.h"
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#include "gpio_api.h"
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#include "mbed_error.h"
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#if DEVICE_PORTIN || DEVICE_PORTOUT
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extern uint32_t gpio_clock_enable(uint32_t port_idx);
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/** Get the pin name from the port's pin number
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*
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* @param port The port name
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* @param pin_n The pin number within the specified port
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* @return The pin name for the port's pin number
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* BIT[7:4] port number
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BIT[3:0] pin number
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*/
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PinName port_pin(PortName port, int pin_n)
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{
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return (PinName)(pin_n + (port << 4));
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}
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/** Initilize the port
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*
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* @param obj The port object to initialize
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* @param port The port name
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* @param mask The bitmask to identify which bits in the port should be included (0 - ignore)
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* @param dir The port direction
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*/
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void port_init(port_t *obj, PortName port, int mask, PinDirection dir)
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{
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uint32_t port_index = (uint32_t)port;
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uint32_t gpio = gpio_clock_enable(port_index);
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obj->port = port;
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obj->mask = mask;
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obj->direction = dir;
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obj->reg_in = &GPIO_ISTAT(gpio);
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obj->reg_out = &GPIO_OCTL(gpio);
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port_dir(obj, dir);
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}
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/** Set port direction (in/out)
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*
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* @param obj The port object
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* @param dir The port direction to be set
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*/
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void port_dir(port_t *obj, PinDirection dir)
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{
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uint32_t i;
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obj->direction = dir;
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for (i = 0; i < 16; i++) {
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if (obj->mask & (1 << i)) {
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if (dir == PIN_OUTPUT) {
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pin_function(port_pin(obj->port, i), MODE_OUT_PP);
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} else {
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pin_function(port_pin(obj->port, i), MODE_IN_FLOATING);
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}
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}
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}
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}
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/** Set the input port mode
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*
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* @param obj The port object
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* @param mode THe port mode to be set
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*/
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void port_mode(port_t *obj, PinMode mode)
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{
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uint32_t i;
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for (i = 0; i < 16; i++) {
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if (obj->mask & (1 << i)) {
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pin_mode(port_pin(obj->port, i), mode);
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}
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}
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}
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/** Write value to the port
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*
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* @param obj The port object
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* @param value The value to be set
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*/
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void port_write(port_t *obj, int value)
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{
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*obj->reg_out = (*obj->reg_out & ~obj->mask) | (value & obj->mask);
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}
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/** Read the current value on the port
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*
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* @param obj The port object
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* @return An integer with each bit corresponding to an associated port pin setting
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*/
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int port_read(port_t *obj)
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{
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if (obj->direction == PIN_OUTPUT) {
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return (*obj->reg_out & obj->mask);
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} else {
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return (*obj->reg_in & obj->mask);
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}
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}
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#endif
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