希望你们中的一个可以帮助我！
我正在尝试将Adafruit SHT31-D（一种 i2c 设备）板与我的 Pi2 一起使用。我将使用此数据表来指导我的编码工作。我正在使用 Wiring Pi (wiringpi.com) 来简化操作。
我能够成功打开与设备的连接，并且发送命令似乎工作正常，但我无法读回数据！这是我整理的小型迷你图书馆。我希望你们中的一个人可能对这类事情有一些经验，并能够帮助我看看我哪里出了问题。
为了排除传感器硬件可能存在的任何问题，我已经用我的 Arduino UNO 对其进行了测试，它可以正常工作。
这是我的 C++ 代码：
SHT3x.h
#pragma once
/* Sensor Commands */
#define DEFAULT_SHT_ADDR 0x44
#define MEAS_HREP_STRETCH 0x2C06
#define MEAS_MREP_STRETCH 0x2C0D
#define MEAS_LREP_STRETCH 0x2C10
#define MEAS_HREP 0x2400
#define MEAS_MREP 0x240B
#define MEAS_LREP 0x2416
#include <cstdint>
class SHT3x {
public:
SHT3x(const uint8_t& i2cAddr);
float readHumidity(const uint16_t& command) const;
float readTempC(const uint16_t& command) const;
float readTempF(const uint16_t& command) const;
private:
int8_t _fd;
uint8_t _header;
uint32_t getMeasurement(const uint16_t& command) const;
void sendCommand(const uint16_t& command) const;
uint32_t receiveData(void) const;
};
SHT3x.cpp
#include <stdexcept>
#include <wiringPi.h>
#include <wiringPiI2C.h>
#include "SHT3x.h"
SHT3x::SHT3x(const uint8_t& i2cAddr) {
_fd = wiringPiI2CSetup(i2cAddr);
_header = i2cAddr << 1;
if (_fd < 0) {
throw std::runtime_error("Unable to connect");
}
}
float SHT3x::readHumidity(const uint16_t& command) const {
uint32_t raw_data = getMeasurement(command);
if (!raw_data) {
throw std::runtime_error("Bad Reading.");
}
uint16_t raw_humidity = raw_data & 0xFFFF;
float humidity = 100.0 * ((float) raw_humidity / (float) 0xFFFF);
return humidity;
}
float SHT3x::readTempC(const uint16_t& command) const {
uint32_t raw_data = getMeasurement(command);
if (!raw_data) {
throw std::runtime_error("Bad Reading.");
}
uint16_t raw_temp = raw_data >> 16;
float tempC = -45.0 + (175.0 * ((float) raw_temp / (float) 0xFFFF));
return tempC;
}
float SHT3x::readTempF(const uint16_t& command) const {
uint32_t raw_data = getMeasurement(command);
if (!raw_data) {
throw std::runtime_error("Bad Reading.");
}
uint16_t raw_temp = raw_data >> 16;
float tempF = -49.0 + (315.0 * ((float) raw_temp / (float) 0xFFFF));
return tempF;
}
uint32_t SHT3x::getMeasurement(const uint16_t& command) const {
try {
sendCommand(command);
} catch (std::runtime_error& e) {
throw;
}
return receiveData();
}
void SHT3x::sendCommand(const uint16_t& command) const {
// break command into bytes
uint8_t MSB = command >> 8;
uint8_t LSB = command & 0xFF;
// send header
int8_t ack = wiringPiI2CWrite(_fd, _header);
// send command
ack &= wiringPiI2CWrite(_fd, MSB);
ack &= wiringPiI2CWrite(_fd, LSB);
// handle errors
if (ack) {
throw std::runtime_error("Sending command failed.");
}
}
uint32_t SHT3x::receiveData(void) const {
uint32_t data;
// send header
uint8_t read_header = _header | 0x01;
int8_t ack = wiringPiI2CWrite(_fd, read_header);
// handle errors
if (ack) throw std::runtime_error("Unable to read data.");
// read data
data = wiringPiI2CRead(_fd);
for (size_t i = 0; i < 4; i++) {
printf("Data: %d\n", data);
data <<= 8;
if (i != 1) {
data |= wiringPiI2CRead(_fd);
} else {
wiringPiI2CRead(_fd); // skip checksum
}
}
wiringPiI2CRead(_fd); // second checksum
return data;
}