ADS1115在IIC在Qt上实现

ADS1115是一种高精度、低功耗的16位模数转换器，可以通过I2C接口与微控制器通信。在Qt中实现I2C通信需要使用Qt的QI2CDevice类和QI2CBus类，下面是一个简单的ADS1115读取示例代码：

#include <QCoreApplication>
#include <QI2CBus>
#include <QI2CDevice>
#include <QDebug>

#define I2C_BUS 1
#define ADS1115_ADDR 0x48
#define REG_CONFIG 0x01
#define REG_CONVERSION 0x00

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    // 打开I2C总线
    QScopedPointer<QI2CBus> bus(QI2CBus::create(QString("i2c-%1").arg(I2C_BUS)));
    if (!bus->open(QIODevice::ReadWrite)) {
        qCritical() << "Failed to open I2C bus";
        return -1;
    }

    // 创建ADS1115设备对象
    QScopedPointer<QI2CDevice> ads(new QI2CDevice(ADS1115_ADDR, bus.data()));

    // 配置ADS1115为单端输入模式，读取A0通道的电压值
    QByteArray config(2, 0);
    config[0] = REG_CONFIG;
    config[1] = 0b11000001; // OS=1, MUX=000, PGA=010, MODE=1, DR=100, COMP_MODE=0, COMP_POL=0, COMP_LAT=0, COMP_QUE=11
    if (ads->write(config) != config.length()) {
        qCritical() << "Failed to write ADS1115 configuration";
        return -1;
    }

    // 读取ADS1115的转换结果
    QByteArray conv(2, 0);
    conv[0] = REG_CONVERSION;
    if (ads->write(conv) != conv.length()) {
        qCritical() << "Failed to write ADS1115 conversion register address";
        return -1;
    }
    if (ads->read(conv) != conv.length()) {
        qCritical() << "Failed to read ADS1115 conversion result";
        return -1;
    }

    // 计算电压值并打印
    qint16 value = (static_cast<quint8>(conv[0]) << 8) | static_cast<quint8>(conv[1]);
    double voltage = value * 6.144 / 32767; // 根据PGA设置计算电压值
    qDebug() << "Voltage: " << voltage;

    return a.exec();
}

需要注意的是，在Linux系统中，需要在/boot/config.txt文件中将I2C总线打开：

dtparam=i2c_arm=on

另外，需要确保ADS1115的地址和I2C总线的编号正确设置。