候鹏飞
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# Copyright (c) 2021 Talkweb Co.,ltd.
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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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static_library("module_traffic_light_example") {
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sources = [
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"traffic_light_example.c"
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]
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include_dirs = [
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"//utils/native/lite/include",
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"//kernel/liteos_m/kal/cmsis",
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"//base/iot_hardware/peripheral/interfaces/kits"
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]
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}
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# OpenHarmony模组开发-灯光控制和蜂鸣器使用
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本案例使用到了四组LED灯、蜂鸣器和按键。通过按键每次按下来控制不同的灯亮以及改变蜂鸣器的状态、实现蜂鸣器的鸣叫。
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# 目录结构：
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## src
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traffic_light_example.c --灯光和蜂鸣器控制源文件
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# 相关API介绍
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## traffic_light_example demo
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IoTWatchDogDisable： 关闭看门狗函数
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IoTGpioInit(unsigned int id)： 初始化GPIO
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参数说明：
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–id Indicates the GPIO pin number.
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IotIoSetFunc(IOT_GPIO_IO_NAME id, unsigned char val)： 注册功能
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参数说明：
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-id Indicates the GPIO pin number.
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-val 复用功能
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IoTGpioSetDir(unsigned int id, IotGpioDir dir)：Sets the direction for a GPIO pin.
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参数说明：
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-id Indicates the GPIO pin number.
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-dir IO方向
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IotIoSetPull(IOT_GPIO_IO_NAME id, IOT_IO_PULL val)：设置GPIO为上拉或下拉
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参数说明：
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-id Indicates the GPIO pin number.
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-val 上拉或下拉
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IoTGpioRegisterIsrFunc(unsigned int id, IotGpioIntType intType, IotGpioIntPolarity intPolarity, GpioIsrCallbackFunc func, char *arg)： Enables the interrupt feature for a GPIO pin.
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参数说明：
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-id Indicates the GPIO pin number.
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-intType Indicates the interrupt type.
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-intPolarity Indicates the interrupt polarity.
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-func Indicates the interrupt callback function.
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-arg Indicates the pointer to the argument used in the interrupt callback function.
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IoTGpioSetOutputVal(unsigned int id, IotGpioValue val)：Sets the output level value for a GPIO pin.
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参数说明：
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-id Indicates the GPIO pin number.
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-val Indicates the output level value.
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IoTPwmInit(unsigned int port)： Initializes a PWM device.
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参数说明：
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-port Indicates the port number of the PWM device
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osThreadNew(osThreadFunc_t func, void *argument, const osThreadAttr_t *attr)：Creates an active thread.
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参数说明：
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-func Indicates the entry of the thread callback function.
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-argument Indicates the pointer to the argument passed to the thread.
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-attr Indicates the thread attributes.
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IoTPwmStart(unsigned int port, unsigned short duty, unsigned int freq)：Starts PWM signal output from a specified port based on the given output frequency and duty cycle.
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参数说明：
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-port Indicates the port number of the PWM device.
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-duty Indicates the duty cycle for PWM signal output. The value ranges from 1 to 99.
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-freq Indicates the frequency for PWM signal output.
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IoTPwmStop(unsigned int port)：Stops PWM signal output from a specified port.
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参数说明：
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-port Indicates the port number of the PWM device.
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# 运行结果
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先每个灯闪烁一下，亮2秒灭1秒，2遍，测试4个灯是否正常。
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按键每按下一次，切换一次灯亮同时改变蜂鸣器状态，蜂鸣器状态为1时，蜂鸣。
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@ -0,0 +1,206 @@
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/*
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* Copyright (c) 2021 Talkweb Co.,ltd.
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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 <stdio.h>
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#include <unistd.h>
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#include "ohos_init.h"
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#include "cmsis_os2.h"
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#include "iot_gpio.h"
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#include "iot_watchdog.h"
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#include "iot_pwm.h"
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#include "hi_pwm.h"
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#include "hi_io.h"
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//蜂鸣器PWM端口号
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#define HI_PWM_BEEP_PORT HI_PWM_PORT_PWM0
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//蜂鸣频率
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#define PWM_BEEP_FREQ (4 * 1000)
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//蜂鸣占空比
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#define PWM_BEEP_DUTY (50)
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// 蜂鸣器开关状态
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static int gBeepState = 0;
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typedef struct
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{
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IOT_GPIO_IO_NAME gpioName; //灯的GPIO
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int ioFunc; //IO hi_io_func_gpio
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IotGpioDir dir; //GPIO 方向
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IotGpioValue value; //灯当前值
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} TrafficLight;
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//三色灯的状态数组，每个值代表某个颜色显示还是不显示
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// 当前灯序号
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static int gCurrentLightId = 0;
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static TrafficLight lights[] = {
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//red
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{IOT_GPIO_IO_GPIO_10,
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HI_IO_FUNC_GPIO_10_GPIO,
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IOT_GPIO_DIR_OUT,
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IOT_GPIO_VALUE0},
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//GREEN
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{IOT_GPIO_IO_GPIO_11,
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HI_IO_FUNC_GPIO_11_GPIO,
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IOT_GPIO_DIR_OUT,
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IOT_GPIO_VALUE0},
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//BLUE
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{IOT_GPIO_IO_GPIO_12,
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HI_IO_FUNC_GPIO_12_GPIO,
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IOT_GPIO_DIR_OUT,
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IOT_GPIO_VALUE0},
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//WHITE
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{IOT_GPIO_IO_GPIO_5,
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HI_IO_FUNC_GPIO_5_GPIO,
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IOT_GPIO_DIR_OUT,
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IOT_GPIO_VALUE0}};
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#define MAX_LIGHTS (sizeof(lights) / sizeof(lights[0]))
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/**
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* 按键回调。每按一下，亮某个颜色，其他颜色不亮。同时控制蜂鸣器状态
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* \param arg 回调参数
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*/
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static void
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OnKeyPressed(char *arg)
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{
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(void)arg;
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printf("key pressed c\n");
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//只亮当前灯亮
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for (int i = 0; i < MAX_LIGHTS; i++)
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{
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if (i == gCurrentLightId)
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{
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lights[i].value = IOT_GPIO_VALUE1;
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}
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else
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{
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lights[i].value = IOT_GPIO_VALUE0;
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}
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}
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//按一次键 切换一次当前灯
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gCurrentLightId++;
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if (gCurrentLightId == MAX_LIGHTS)
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{
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gCurrentLightId = 0;
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}
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//开关一次蜂鸣器
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gBeepState = !gBeepState;
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}
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/**
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* 线程入口
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* \param arg 线程参数
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*
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*/
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static void *LightTaskEntry(const char *arg)
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{
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int i, j;
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(void)arg;
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// 测试灯功能是否正常
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// 先每个灯闪烁一下，亮2秒灭1秒，2遍
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for (i = 0; i <= 1; i++)
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{
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for (j = 0; j < MAX_LIGHTS; j++)
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{
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IoTGpioSetOutputVal(lights[j].gpioName, IOT_GPIO_VALUE1);
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usleep(200 * 1000);
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IoTGpioSetOutputVal(lights[j].gpioName, IOT_GPIO_VALUE0);
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usleep(100 * 1000);
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}
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}
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//线程任务循环
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while (1)
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{
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// 每个灯的状态输出到GPIO
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for (i = 0; i < MAX_LIGHTS; i++)
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{
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IoTGpioSetOutputVal(lights[i].gpioName, lights[i].value);
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}
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// 根据蜂鸣器状态控制
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if (gBeepState)
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{
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// 第二个参数duty分频系数，第三个参数freq，160M时钟，
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// freq，选择40K，占空达到一半，输出的是4K频率
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IoTPwmStart(HI_PWM_BEEP_PORT, PWM_BEEP_DUTY, PWM_BEEP_FREQ); //(WIFI_IOT_PWM_PORT_PWM0, 20*1000, 40*1000);
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}
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else
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{
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IoTPwmStop(HI_PWM_BEEP_PORT);
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}
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}
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return NULL;
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}
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// 四色显示+蜂鸣。交通灯板，四色等对应
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//red:GPIO10
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//GREEN GPIO11
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//YELLOW GPIO12
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//WHITE GPIO13，
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//蜂鸣器GPIO09/PWM0，按键中断GPIO08
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static void LightExampleEntry(void)
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{
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IoTWatchDogDisable();
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//初始化灯的 GPIO 状态
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for (int i = 0; i < MAX_LIGHTS; i++)
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{
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TrafficLight *l = &lights[i];
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IoTGpioInit(l->gpioName);
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//注册功能
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IotIoSetFunc(l->gpioName, l->ioFunc);
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//注册io方向
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IoTGpioSetDir(l->gpioName, l->dir);
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}
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//按键处理
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IoTGpioInit(IOT_GPIO_IO_GPIO_8);
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IotIoSetFunc(IOT_GPIO_IO_GPIO_8, HI_IO_FUNC_GPIO_8_GPIO);
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//上升
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IotIoSetPull(IOT_GPIO_IO_GPIO_8, IOT_IO_PULL_UP);
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IoTGpioSetDir(IOT_GPIO_IO_GPIO_8, IOT_GPIO_DIR_IN);
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//注册按键回调
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IoTGpioRegisterIsrFunc(IOT_GPIO_IO_GPIO_8, IOT_INT_TYPE_EDGE, IOT_GPIO_EDGE_RISE_LEVEL_HIGH, OnKeyPressed, NULL);
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//蜂鸣器GPIO09/PWM0
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IotIoSetFunc(IOT_GPIO_IO_GPIO_9, HI_IO_FUNC_GPIO_9_PWM0_OUT);
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IoTGpioSetOutputVal(IOT_GPIO_IO_GPIO_9, IOT_GPIO_DIR_OUT);
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// 初始化PWM设备，这里是蜂鸣器
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IoTPwmInit(HI_PWM_BEEP_PORT);
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// 设置线程属性
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osThreadAttr_t attr;
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attr.name = "TrafficTask";
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attr.attr_bits = 0U;
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attr.cb_mem = NULL;
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attr.cb_size = 0U;
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attr.stack_mem = NULL;
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attr.stack_size = 1024;
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attr.priority = osPriorityNormal;
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// 开启线程，执行LED任务。开启线程，避免主线程阻塞
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if (osThreadNew((osThreadFunc_t)LightTaskEntry, NULL, &attr) == NULL)
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{
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printf("TrafficLight thread Create failed.");
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}
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}
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SYS_RUN(LightExampleEntry);
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