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48 lines
870 B
Markdown
48 lines
870 B
Markdown
# PWM
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*PWM用于产生模拟信号驱动舵机或蜂鸣器*
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## ledcSetup()
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**函数原型：**
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`void ledcSetup(uint8_t channel, double freq, uint8_t resolution_bits);`
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**功能：设置PWM通道,频率和分辨率。**
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## ledcAttachPin()
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**函数原型：**
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`void ledcAttachPin(uint8_t pin, uint8_t channel);`
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**功能：将 LEDC 通道绑定到指定 IO 口上以实现输出**
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## ledWrite()
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**函数原型：**
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`void ledcWrite(uint8_t channel, uint32_t duty);`
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**功能：向channel通道写入duty%占空比。**
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**例程：**
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```clike
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#include <M5StickC.h>
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int freq = 1800;
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int channel = 0;
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int resolution_bits = 8;
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int buzzer = 2;
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void setup() {
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M5.begin();
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ledcSetup(channel, freq, resolution_bits);
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ledcAttachPin(buzzer, channel);
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}
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void loop() {
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ledcWrite(channel, 128);
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delay(1000);
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ledcWrite(channel, 0);
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delay(1000);
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}
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``` |