48 lines
1.2 KiB
Go
48 lines
1.2 KiB
Go
// gpio_controller.go
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package business
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import (
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"fmt"
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"os"
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"strconv"
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"time"
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)
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const BuzzerGPIO = 109
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// TriggerBuzzer 触发蜂鸣器响指定秒数
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func TriggerBuzzer(seconds int) {
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if seconds <= 0 {
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seconds = 10
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}
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// 必须用同步！异步 goroutine 在某些系统里会被静默丢弃
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fmt.Printf("蜂鸣器开始响铃 %d 秒...\n", seconds)
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gpioPath := fmt.Sprintf("/sys/class/gpio/gpio%d", BuzzerGPIO)
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// 1. 强制导出（即使已经导出也没事）
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os.WriteFile("/sys/class/gpio/export", []byte(strconv.Itoa(BuzzerGPIO)), 0666)
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time.Sleep(50 * time.Millisecond)
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// 2. 强制设为输出
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os.WriteFile(fmt.Sprintf("%s/direction", gpioPath), []byte("out"), 0666)
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time.Sleep(10 * time.Millisecond)
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// 3. 拉高 → 响
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if err := os.WriteFile(fmt.Sprintf("%s/value", gpioPath), []byte("1"), 0666); err != nil {
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fmt.Printf("GPIO拉高失败: %v\n", err)
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} else {
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fmt.Println("GPIO109 已拉高 → 蜂鸣器响！")
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}
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time.Sleep(time.Duration(seconds) * time.Second)
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// 4. 拉低 → 停
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if err := os.WriteFile(fmt.Sprintf("%s/value", gpioPath), []byte("0"), 0666); err != nil {
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fmt.Printf("GPIO拉低失败: %v\n", err)
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} else {
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fmt.Println("GPIO109 已拉低 → 蜂鸣器停止")
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}
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}
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