误取ADC输入

Question

我使用的是皮质M3基板。这是我第一次编程这种板，所以我不知道如何阅读库，并使它“发生”。

这个板带有温度传感器，我正在尝试使用adc库进行读取。

我的代码：

#include <adc.h>
#include <gpio.h>

using namespace EPOS;
//const NIC::Protocol NIC_PROTOCOL = 42;

ADC * temperature;

int main()
{
   temperature = new ADC( 0xE, 0x2, 0x3);
   //    printf("&temperature"); 

   return 0;
}

图书馆

// EPOS ARM Cortex-M Analog to Digital Converter (ADC) Mediator Declarations

#include <system/config.h>
#if !defined(__cortex_adc_h_) && defined(__ADC_H)
#define __cortex_adc_h_

#include <adc.h>
#include <machine.h>

__BEGIN_SYS

class ADC: private ADC_Common, private Machine_Model
{
public:
    enum Channel {
        SINGLE_ENDED_ADC0 = 0,
        SINGLE_ENDED_ADC1 = 1,
        SINGLE_ENDED_ADC2 = 2,
        SINGLE_ENDED_ADC3 = 3,
        SINGLE_ENDED_ADC4 = 4,
        SINGLE_ENDED_ADC5 = 5,
        SINGLE_ENDED_ADC6 = 6,
        SINGLE_ENDED_ADC7 = 7,
        DIFF8             = 8,
        DIFF9             = 9,
        DIFF10            = 10,
        DIFF11            = 11,
        GND               = 12,
        TEMPERATURE       = 14,
        AVDD5_3           = 15,
    };

    enum Reference {
        INTERNAL_REF   = 0,
        EXTERNAL_REF   = 1, // External reference on AIN7 pin
        SYSTEM_REF     = 2,
        EXTERNAL_DIFF  = 3
    };

    enum Resolution {
        BITS_7  = 0, //  7 bits resolution, 64  decimation rate
        BITS_9  = 1, //  9 bits resolution, 128 decimation rate
        BITS_10 = 2, // 10 bits resolution, 256 decimation rate
        BITS_12 = 3  // 12 bits resolution, 512 decimation rate
    };

    ADC(const Channel & channel = SINGLE_ENDED_ADC5, const Reference & reference = SYSTEM_REF, const Resolution & resolution = BITS_12)
    : _channel(channel), _reference(reference), _resolution(resolution) {
        Machine_Model::adc_config(_channel);
    }

    short read() {
        reg(ADCCON3) = (_reference * ADCCON3_EREF) | (_resolution * ADCCON3_EDIV) | (_channel * ADCCON3_ECH);
        while(!(reg(ADCCON1) & ADCCON1_EOC));
        short ret = (reg(ADCH) << 8) + reg(ADCL);
        switch(_resolution) {
            case BITS_7:  ret >>= 9; break;
            case BITS_9:  ret >>= 7; break;
            case BITS_10: ret >>= 6; break;
            case BITS_12: ret >>= 4; break;
        }
        return ret;
    }

    // returns the voltage corresponding to the reading, with three decimal places (e.g. 2534 means 2.534V)
    int convert(short raw_reading, int reference = 3300/*3.3V*/) {
        int limit;
        switch(_resolution) {
            case BITS_7:  limit =   63; break;
            case BITS_9:  limit =  255; break;
            case BITS_10: limit =  511; break;
            case BITS_12: limit = 2047; break;
        }
        return raw_reading * reference / limit;
    }

private:
    volatile CPU::Reg32 & reg(unsigned int o) { return reinterpret_cast<volatile CPU::Reg32*>(ADC_BASE)[o / sizeof(CPU::Reg32)]; }

    Channel _channel;
    Reference _reference;
    Resolution _resolution;
};

__END_SYS

#endif

错误：

temperature.cc:在函数'int ()：temperature.cc:11:从'int‘到’EPOS：：s：：ADC：：temperature.cc:11: temperature.cc:11:初始化参数1‘EPOS：：s:ADC：：ADC：：temperature.cc:11&，temperature.cc:11:错误:从'int‘到’EPOS：：s：：temperature.cc:11:初始化参数2‘EPOS：：s：：ADC：temperature.cc:11:错误:从'int‘到’EPOS：：s：：temperature.cc:11:初始化参数3的‘EPOS：：s：：ADC：const :ADC：：分辨率&)‘makefile:11:目标’Temature.o‘失败的make2：* Temature.o错误1 make2:离开目录’/home/thiago/make2/arm/ app‘makefile:17： 'app’failed make1：*应用错误2 make1:离开目录'/home/thiago/Documents/arm‘makefile:11:用于目标“所有”失败的配方：*所有错误2

编程语言: c++

谢谢。

Answer 1

ADC构造函数需要3 引用传递的参数，因此必须传递变量。

您的代码至少应该是：

int main(void)
{  
   Channel channel = TEMPERATURE; 
   Reference reference = SYSTEM_REF;
   Resolution resolution = BITS_12;

   temperature = new ADC( channel, reference, resolution);

   return 0;
}

编辑

正如其他用户已经说过的，您应该避免在资源有限的uC嵌入式应用程序上使用动态分配(主要是RAM)。

因此，您可以实例化类如下：

int main(void)
{  
   short temperature;

   Channel channel = TEMPERATURE; 
   Reference reference = SYSTEM_REF;
   Resolution resolution = BITS_12;

   ADC reader( channel, reference, resolution);

   while (1)
   {
      temperature = reader.read();
   }
}