我想获得两个PWM信号(即PWM输入)的频率和占空比,并根据输入将它们设置为另一个(即PWM输出).这些PWM信号的占空比为50％,而其频率范围为1kHz至20kHz.
我检查了一下网页,我从Windows 10 IoT Core找到了Microsoft IoT Lightning库(即总线提供商).即使使用PWM Consumer示例,这个库似乎也是我需要的！
然而,当我在测试基于PWM Consumer的第一个示例时,我注意到PWM控制器的频率范围限制在40Hz到1kHz之间.因此,第一个问题：似乎不支持频率范围.
此外,当PWM控制器属性“ActualFrequency”返回通过“SetDesiredFrequencyMethod”设置的频率时,PWMPin对象仅提供有关当前占空比的信息.
因此,我用谷歌搜索寻找答案,我发现this question比以前的两个问题更让我困惑.
您知道是否可以以及如何使用MS-IoT Lightning Library在Raspberry Pi2上设置/获取1kHz至20kHz的PWM信号？
这里,示例中的几行代码：
public async void Run(IBackgroundTaskInstance taskInstance)
{
if (!LightningProvider.IsLightningEnabled)
{
// Lightning provider is required for this sample
return;
}
var deferral = taskInstance.GetDeferral();
// Use the PAC9685 PWM provider,LightningPCA9685PwmControllerProvider
pwmController = (await PwmController.GetControllersAsync(LightningPwmProvider.GetPwmProvider()))[0];
motorPin = pwmController.OpenPin(0);
secondMotorPin = pwmController.OpenPin(1);
//// To use the software PWM provider,LightningSoftwarePwmControllerProvider,with GPIO pins 5 and 6,//// uncomment the following lines and comment the ones above
//pwmController = (await PwmController.GetControllersAsync(LightningPwmProvider.GetPwmProvider()))[1];
//motorPin = pwmController.OpenPin(5);
//secondMotorPin = pwmController.OpenPin(6);
pwmController.SetDesiredFrequency(50);
motorPin.SetActiveDutyCyclePercentage(RestingPulseLegnth);
motorPin.Start();
secondMotorPin.SetActiveDutyCyclePercentage(RestingPulseLegnth);
secondMotorPin.Start();
timer = ThreadPoolTimer.CreatePeriodicTimer(Timer_Tick,TimeSpan.FromMilliseconds(500));
}
private void Timer_Tick(ThreadPoolTimer timer)
{
iteration++;
if (iteration % 3 == 0)
{
currentPulseLength = ClockwisePulseLength;
secondPulseLength = CounterClockwisePulseLegnth;
}
else if (iteration % 3 == 1)
{
currentPulseLength = CounterClockwisePulseLegnth;
secondPulseLength = ClockwisePulseLength;
}
else
{
currentPulseLength = 0;
secondPulseLength = 0;
}
double desiredPercentage = currentPulseLength / (1000.0 / pwmController.ActualFrequency);
motorPin.SetActiveDutyCyclePercentage(desiredPercentage);
double secondDesiredPercentage = secondPulseLength / (1000.0 / pwmController.ActualFrequency);
secondMotorPin.SetActiveDutyCyclePercentage(secondDesiredPercentage);
}
一切顺利,洛伦佐
