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当我把它加载到我的板上时，我得到一个找不到外围设备错误的 pinmap。我对这个问题做了一些研究（我访问过的页面之一），我想我理解这个问题，但是我使用的所有引脚都支持我要求他们做的事情。自从我将代码从过程转换为面向对象（我需要这样做才能正确实现调度）时，才出现此问题。

我感觉这与我如何在构造函数成员初始化器列表中初始化它们有关，因为我不完全理解它是如何工作的（我对 C++ 相当陌生）。

我的程序还有其他类，但是它们遵循与我的 UpdateOutput 类相同的结构。

提前感谢您的任何建议。

int main() {
    printf("inside main");

    DigitalOut led1(LED1);
    AnalogOut Vout(A0);
    UpdateOutput wave;
    SensorData inputs;
    Timer time;

    enum waves {OFF = 0, SINE, TRIANGLE, SAW, SQUARE};
    int waveType = OFF;

    float sonarCorrection = inputs.calibrateSonar();//makes a measurement of the acatual run time of the sonar code
    float topFrequency = 1047.0f;                                       //the highest frequency the synth will play
    float upperSonarThreshold = 1000.0f;                        //the furthest distance the sonar will register
    float lowerSonarThreshold = 100.0f;                         //the closest distance the sonar will measure
    float period = 2272.73f; 
    //replace with:
    //float period = inputs.getFrequency(float lowerThreshold, float upperThreshold, int correction, float topFrequency);
    //after bug fixes have been applied

    led1 = 1;                   //turn on led1 to show code is running properly

    time.reset();
    time.start();
    int tmr = time.read_us();

    //test loop before thredding is applied
    while(true)
    {
        waveType = SINE; //keep synth producing a sine wave for testing
        tmr = time.read_us();
        switch(waveType)
        {
            case OFF:
                Vout = 0.0f;
                break;

            case SINE:
                Vout = wave.sinWave(tmr , period);
                break;

            case TRIANGLE:
                Vout = wave.triangleWave(tmr , period);
                break;

            case SAW:
                    Vout = wave.sawWave(tmr, period);
                break;

            case SQUARE:
                Vout = wave.squareWave(tmr, period);
                break;

            default:
                waveType = TRIANGLE;
                break;


        }//end of wave type switch case
    }

}

更新输出类：

class UpdateOutput{


    public:


            //constructor for class, with member initializer list
                UpdateOutput(): runLed(LED2), clipLed(LED3), dac(D13) 
                {}

            float sinWave(int tmr, float period);

            float sawWave(int tmr, float period);

            float triangleWave(int tmr, float period);

            float squareWave(int tmr, float period);


    private:

    //class attributes
    DigitalOut runLed;
    DigitalOut clipLed;
    AnalogOut dac;

    //extern float frequency(float lowerThreshold, float upperThreshold, int correction);
    bool waveState = 0;
    //float lastVout;
};

UpdateOutputs 类中的函数示例

float UpdateOutput::squareWave(int tmr, float period){
    float Vout = 0.0f;
    //float period5 = period/1.587401052;
    float resultingWave;

    float x = (float)(tmr % (int)period)/period;

    if (x > 0.5f){
        resultingWave = 1.0f;
    }
    else{
        Vout = 0.0f;
    }

    Vout = (resultingWave/WAVE_DEVIDOR)+(0.25f); //translate wave to work between 0 and 1 rather than -1 and 1
    if (Vout > 1){
        clipLed = 1;
        Vout = 1.0f;
    }
    else if (Vout < 0.0f){
        clipLed = 1;
        Vout = 0.0f;
    }
    //printf("Vout = %5.3f\n\r", Vout);
    return Vout;
}//end of squareWave
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1 回答 1

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您正在AnalogOut Vout(A0);用作 DAC 输出main()。也许您打算UpdateOutput::dac直接在课堂上更新>

A0PA_3在PinNames.h中分配，而PeripheralPinMaps.h具有：

//*** DAC ***

MSTD_CONSTEXPR_OBJ_11 PinMap PinMap_DAC[] = {
    {PA_4,       DAC_1, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 1, 0)}, // DAC_OUT1
    {PA_5,       DAC_1, STM_PIN_DATA_EXT(STM_MODE_ANALOG, GPIO_NOPULL, 0, 2, 0)}, // DAC_OUT2
    {NC, NC, 0}
};

所以它AnalogOut Vout(A0);是无效的。D13但是，分配给UpdateOutput::dac和哪个是别名PA_5 是正确的。

您可能会更改AnalogOut Vout(A0)为AnalogOut Vout(D13);，但我怀疑您要么是，要么打算UpdateOutput::dac在波形发生器函数本身中更新，而不是分配它们的返回值。

于 2020-04-29T14:53:46.230 回答