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109 lines
2.4 KiB
109 lines
2.4 KiB
5 months ago
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/*
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* Copyright (c) 2006-2018, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2017-09-06 勤为本 first version
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*/
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#ifndef __LOONGSON_GPIO_H
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#define __LOONGSON_GPIO_H
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// 龙芯1c的gpio是按照0,1,2,3,4...这样的顺序编号的，
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// 但在操作寄存器的时候，又是按照每32个一组来分的
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// 这里利用这个特性，将每组的32个gpio叫做一个"port"，每个gpio在每组中的索引叫"pin"
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// port = gpio / 32
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// pin = gpio % 32
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// 例如GPIO50，port=1,pin=18
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#define GPIO_GET_PORT(gpio) ((gpio) / 32)
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#define GPIO_GET_PIN(gpio) ((gpio) % 32)
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// gpio的工作模式--输入、输出
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typedef enum{
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gpio_mode_output = 0, // 输出
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gpio_mode_input = 1 // 输入
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}gpio_mode_t;
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// gpio高低电平值
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typedef enum{
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gpio_level_low = 0, // 低电平
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gpio_level_high = 1 // 高电平
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}gpio_level_t;
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typedef enum {
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// 上升沿触发
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IRQ_TYPE_EDGE_RISING = 0x00000001,
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// 下降沿触发
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IRQ_TYPE_EDGE_FALLING = 0x00000002,
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IRQ_TYPE_EDGE_BOTH = (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING),
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// 高电平触发
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IRQ_TYPE_LEVEL_HIGH = 0x00000004,
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// 低电平触发
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IRQ_TYPE_LEVEL_LOW = 0x00000008,
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IRQ_TYPE_LEVEL_MASK = (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH),
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}gpio_irq_type_t;
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/*
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* 获取指定gpio的CFG寄存器
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* @gpio gpio编号
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* @ret CFG寄存器
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*/
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volatile unsigned int *gpio_get_cfg_reg(unsigned int gpio);
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/*
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* gpio初始化
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* @gpio gpio引脚，取值范围[0, 127]
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* @mode gpio的工作模式(输入、输出)
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*
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* 例: 将gpio50初始化为输出
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* gpio_init(50, gpio_mode_output);
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*/
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void gpio_init(unsigned int gpio, gpio_mode_t mode);
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/*
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* 在指定gpio输出高电平或低电平
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* @gpio gpio引脚，取值范围[0, 127]
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* @level 电平值
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*
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* 例: 在gpio50上输出低电平
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* gpio_set(50, gpio_level_low);
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*/
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void gpio_set(unsigned int gpio, gpio_level_t level);
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/*
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* 读取指定gpio引脚的值
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* @gpio gpio引脚，取值范围[0,127]
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*
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* 例: 读取gpio50引脚上的值
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* gpio_level_t level;
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* level = gpio_get(50);
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*/
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unsigned int gpio_get(unsigned int gpio);
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/**
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* 设置中断类型
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* @gpio gpio引脚
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* @type 触发中断的条件。高电平触发、低电平触发、上升沿触发 or 下降沿触发
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*/
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void gpio_set_irq_type(unsigned int gpio, gpio_irq_type_t type);
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#endif
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