一、前言
HarmonyOS HiSpark Wi-Fi IoT 套件开发之交通灯板
二、场景描述
场景设定:十字路口
三、功能描述
行人过街按钮。当行人过街时,按下按钮,系统会根据实时的道路车流量情况、行人过街情况调整信号灯。
![#2020征文-开发板# Hi3861 交通灯板HiSpark_WiFi_IoT开发-鸿蒙开发者社区 #2020征文-开发板# Hi3861 交通灯板HiSpark_WiFi_IoT开发-鸿蒙开发者社区](https://dl-harmonyos.51cto.com/images/202101/987ba781636de9c5b68175e203331ca239cc60.jpg)
四、功能实现
首先,无按钮按下时,一直亮红灯
然后,当按钮按下时,亮绿灯
最后,绿灯熄灭,黄灯闪烁,同时音乐响起催促行人快些过街
五、代码实现
/*
* Copyright (c) 2020 Huawei Device Co., Ltd.
* 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.
*/
/*
* HiSpark_WiFi_IoT_SSL_VER.A板
* GPIO_8 按键
* GPIO_9 蜂鸣器
* GPIO_10 红色LED,高电平点亮
* GPIO_11 绿色LED,高电平点亮
* GPIO_12 黄色LED,高电平点亮
*/
#include <stdio.h>
#include <unistd.h>
#include <time.h>
#include <stdlib.h>
#include "ohos_init.h"
#include "cmsis_os2.h"
#include "wifiiot_gpio.h"
#include "wifiiot_gpio_ex.h"
#include "wifiiot_pwm.h"
#include "hi_pwm.h"
#define LED_INTERVAL_TIME_US 300000
#define LED_TASK_STACK_SIZE 512
#define LED_TASK_PRIO 25
#define random(x) (rand()%x)
enum LedState {
LED_RED = 0,
LED_GREEN,
LED_YELLOW,
};
enum LedState g_ledState = LED_RED;
static const uint16_t g_freqs[] = {// 40M Hz 对应的分频系数
38223, // 1046.5
34052, // 1174.7
30338, // 1318.5
28635, // 1396.9
25511, // 1568
22728, // 1760
20249 // 1975.5
};
static void *LedTask(const char *arg)
{
(void)arg;
while (1) {
int count = 0;
switch (g_ledState) {
case LED_RED:
GpioSetOutputVal(WIFI_IOT_IO_NAME_GPIO_10, 1);
usleep(LED_INTERVAL_TIME_US);
break;
case LED_GREEN:
srand((unsigned)time(NULL));
usleep(random(1000)*1000);
GpioSetOutputVal(WIFI_IOT_IO_NAME_GPIO_10, 0);
GpioSetOutputVal(WIFI_IOT_IO_NAME_GPIO_11, 1);
usleep(LED_INTERVAL_TIME_US * 10);
GpioSetOutputVal(WIFI_IOT_IO_NAME_GPIO_11, 0);
usleep(LED_INTERVAL_TIME_US);
g_ledState = LED_YELLOW;
break;
case LED_YELLOW:
do
{
GpioSetOutputVal(WIFI_IOT_IO_NAME_GPIO_12, 1);
Pwmstart(WIFI_IOT_PWM_PORT_PWM0, g_freqs[count]/2, g_freqs[count]);
usleep(LED_INTERVAL_TIME_US);
GpioSetOutputVal(WIFI_IOT_IO_NAME_GPIO_12, 0);
PwmStop(WIFI_IOT_PWM_PORT_PWM0);
usleep(LED_INTERVAL_TIME_US);
count++;
} while (count < 7);
g_ledState = LED_RED;
break;
default:
usleep(LED_INTERVAL_TIME_US);
break;
}
}
return NULL;
}
static void OnKeyPressed(char *arg)
{
(void)arg;
if(g_ledState == LED_RED)
{
g_ledState = LED_GREEN;
}
}
static void LedExampleEntry(void)
{
osThreadAttr_t attr;
GpioInit();
//设置KEY IO为输入状态,并使能中断
IoSetFunc(WIFI_IOT_IO_NAME_GPIO_8, WIFI_IOT_IO_FUNC_GPIO_8_GPIO);
GpioSetDir(WIFI_IOT_IO_NAME_GPIO_8, WIFI_IOT_GPIO_DIR_IN);
IoSetPull(WIFI_IOT_IO_NAME_GPIO_8, WIFI_IOT_IO_PULL_UP);
GpioRegisterIsRFunc(WIFI_IOT_IO_NAME_GPIO_8, WIFI_IOT_INT_TYPE_EDGE, WIFI_IOT_GPIO_EDGE_RISE_LEVEL_HIGH, OnKeyPressed, NULL);
// 蜂鸣器引脚 设置为 PWM功能
IoSetFunc(WIFI_IOT_IO_NAME_GPIO_9, WIFI_IOT_IO_FUNC_GPIO_9_PWM0_OUT);
PwmInit(WIFI_IOT_PWM_PORT_PWM0);
hi_pwm_set_clock(PWM_CLK_XTAL); // 设置时钟源为晶体时钟(40MHz,默认时钟源160MHz)
//设置红色,黄色,绿色 LED IO为输出状态
IoSetFunc(WIFI_IOT_IO_NAME_GPIO_10, WIFI_IOT_IO_FUNC_GPIO_10_GPIO);
GpioSetDir(WIFI_IOT_IO_NAME_GPIO_10, WIFI_IOT_GPIO_DIR_OUT);
IoSetFunc(WIFI_IOT_IO_NAME_GPIO_11, WIFI_IOT_IO_FUNC_GPIO_11_GPIO);
GpioSetDir(WIFI_IOT_IO_NAME_GPIO_11, WIFI_IOT_GPIO_DIR_OUT);
IoSetFunc(WIFI_IOT_IO_NAME_GPIO_12, WIFI_IOT_IO_FUNC_GPIO_12_GPIO);
GpioSetDir(WIFI_IOT_IO_NAME_GPIO_12, WIFI_IOT_GPIO_DIR_OUT);
attr.name = "LedTask";
attr.attr_bits = 0U;
attr.cb_mem = NULL;
attr.cb_size = 0U;
attr.stack_mem = NULL;
attr.stack_size = LED_TASK_STACK_SIZE;
attr.priority = LED_TASK_PRIO;
if (osThreadNew((osThreadFunc_t)LedTask, NULL, &attr) == NULL) {
printf("[LedExample] Falied to create LedTask!\n");
}
}
SYS_RUN(LedExampleEntry);
- 1.
- 2.
- 3.
- 4.
- 5.
- 6.
- 7.
- 8.
- 9.
- 10.
- 11.
- 12.
- 13.
- 14.
- 15.
- 16.
- 17.
- 18.
- 19.
- 20.
- 21.
- 22.
- 23.
- 24.
- 25.
- 26.
- 27.
- 28.
- 29.
- 30.
- 31.
- 32.
- 33.
- 34.
- 35.
- 36.
- 37.
- 38.
- 39.
- 40.
- 41.
- 42.
- 43.
- 44.
- 45.
- 46.
- 47.
- 48.
- 49.
- 50.
- 51.
- 52.
- 53.
- 54.
- 55.
- 56.
- 57.
- 58.
- 59.
- 60.
- 61.
- 62.
- 63.
- 64.
- 65.
- 66.
- 67.
- 68.
- 69.
- 70.
- 71.
- 72.
- 73.
- 74.
- 75.
- 76.
- 77.
- 78.
- 79.
- 80.
- 81.
- 82.
- 83.
- 84.
- 85.
- 86.
- 87.
- 88.
- 89.
- 90.
- 91.
- 92.
- 93.
- 94.
- 95.
- 96.
- 97.
- 98.
- 99.
- 100.
- 101.
- 102.
- 103.
- 104.
- 105.
- 106.
- 107.
- 108.
- 109.
- 110.
- 111.
- 112.
- 113.
- 114.
- 115.
- 116.
- 117.
- 118.
- 119.
- 120.
- 121.
- 122.
- 123.
- 124.
- 125.
- 126.
- 127.
- 128.
- 129.
- 130.
- 131.
- 132.
- 133.
- 134.
- 135.
- 136.
- 137.
- 138.
- 139.
- 140.
- 141.
- 142.
- 143.
- 144.
- 145.
- 146.
- 147.
- 148.
- 149.
- 150.
六、编译
![#2020征文-开发板# Hi3861 交通灯板HiSpark_WiFi_IoT开发-鸿蒙开发者社区 #2020征文-开发板# Hi3861 交通灯板HiSpark_WiFi_IoT开发-鸿蒙开发者社区](https://dl-harmonyos.51cto.com/images/202101/c4e984b334957cb48457366e6190fc74fd04f7.jpg)
七、烧录
![#2020征文-开发板# Hi3861 交通灯板HiSpark_WiFi_IoT开发-鸿蒙开发者社区 #2020征文-开发板# Hi3861 交通灯板HiSpark_WiFi_IoT开发-鸿蒙开发者社区](https://dl-harmonyos.51cto.com/images/202101/c45b68409796786552b492d33fb061b8f226bd.jpg)
八、运行
![#2020征文-开发板# Hi3861 交通灯板HiSpark_WiFi_IoT开发-鸿蒙开发者社区 #2020征文-开发板# Hi3861 交通灯板HiSpark_WiFi_IoT开发-鸿蒙开发者社区](https://dl-harmonyos.51cto.com/images/202101/a807d9919a02bb14888268e89a6e723a738e50.gif)
九、总结
1)编译过程中报错:undefined reference to hi_pwm_init 等几个 hi_pwm_开头的函数,原因: 因为默认情况下,hi3861_sdk中,PWM的CONFIG选项没有打开。解决: 修改vendor\hisi\hi3861\hi3861\build\config\usr_config.mk文件中的CONFIG_PWM_SUPPORT行:
修改为
2)在开发过程中参考了润和软件许老师的作品还有其他大佬的总结,在此一并感谢。