PWM播放<<铃儿响叮当>>
参考
OpenHarmony LYEVK-3861开发板播放《蜜雪冰城》
OpenHarmony Neptune开发板PWM驱动 播放《小星星》
收到XR806开发板了，之前在公众号看到有人用开发板播放蜜雪冰城，快到圣诞节了，今天试下播放<<铃儿响叮当>>。
环境搭建
- WSL2 Ubuntu 20.04 LTS开发环境搭建
感觉和正常的Ubuntu环境配置(220119发现链接失效，我从提交记录里找到了当时参考的那一篇)没啥区别，区别有以下几个
a.在 安装必要的库和工具的时候把libc6-dev-amd64替换为libc6-dev就成，这个方法参考github上边wsl给的遇到E: Unable to locate package libc6-dev-amd64的解决方案
b.我没装LLVM也可以烧录
- XR806开发板、无源蜂鸣器
开发
曲谱
流程
代码编写
cd device/xradio/xr806/ohosdemo
mkdir beeperMusic
目录如下
.
├── BUILD.gn
├── beeperMusic
│ ├── BUILD.gn
│ └── src
│ └── main.c
├── hello_demo
├── iot_peripheral
└── wlan_demo
源代码
//main.c
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "kernel/os/os.h"
#include "iot_pwm.h"
#include "ohos_init.h"
static OS_Thread_t g_main_thread;
// 音符对应的频率
static const uint16_t g_tuneFreqs[] = {523,587,659,698,784,880,988};
// 曲谱音符
static const uint8_t g_scoreNotes[] = {
3,3,3, 3,3,3, 3,5,1,2, 3, 4,4,4, 4,4,3,3,
3,2,2,1, 2,5,
3,3,3, 3,3,3, 3,5,1,2, 3, 4,4,4, 4,4,3,3,
5,5,4,2, 1,
};
// 曲谱时值
static const uint8_t g_scoreDurations[] = {
4,4,8, 4,4,8, 4,4,4,4, 16, 4,4,4, 4,4,4,8,
4,4,4,4, 8,8,
4,4,8, 4,4,8, 4,4,4,4, 16, 4,4,4, 4,4,4,8,
4,4,4,4, 16,
};
static void BeeperMusicTask(const char *arg)
{
(void)arg;
printf("BeeperMusicTask start!\r\n");
IoTPwmInit(0);
unsigned int pwm_duty_ratio = 30;
for (size_t i = 0; i < sizeof(g_scoreNotes)/sizeof(g_scoreNotes[0]); i++) {
unsigned int pwm_delay_cnt = 0;
uint32_t tune = g_scoreNotes[i]; // 音符
uint16_t freqDivisor = g_tuneFreqs[tune];
uint32_t tuneInterval = g_scoreDurations[i] * 10; // 音符时间
printf("%d %d %d %d\r\n", tune,freqDivisor, pwm_duty_ratio,tuneInterval);
IoTPwmStart(0,30,freqDivisor);
OS_MSleep(tuneInterval*5);
IoTPwmStop(0);
}
IoTPwmDeinit(0);
}
void MusicTestMain(void)
{
printf("Music Test Start\n");
if (OS_ThreadCreate(&g_main_thread, "MainThread", BeeperMusicTask, NULL,
OS_THREAD_PRIO_APP, 4 * 1024) != OS_OK) {
printf("[ERR] Create MainThread Failed\n");
}
}
SYS_RUN(MusicTestMain);
beeperMusic目录的BUILD.gn
import("//device/xradio/xr806/liteos_m/config.gni")
static_library("app_music") {
configs = []
sources = [
"src/main.c",
]
cflags = board_cflags
include_dirs = board_include_dirs
include_dirs += [
"//kernel/liteos_m/kernel/arch/include",
"include",
"//base/iot_hardware/peripheral/interfaces/kits",
]
}
group("ohosdemo") {
deps = [
#"hello_demo:app_hello",
#"iot_peripheral:app_peripheral",
#"wlan_demo:app_WlanTest",
"beeperMusic:app_music"
]
}
