如何在 MATLAB 中格式化从串行端口读取的数据？

发布于 2024-08-11 23:03:14 字数 447 浏览 2 评论 0原文

我正在尝试通过 MATLAB 将数字传感器连接到我的计算机。

我首先向传感器发送数据请求，然后传感器用六字节流进行回复。

MATLAB 像这样读取传感器：

data1 = fscanf(obj1, '%c', 6);

我确切地知道数据的内容应该是什么，但我不知道如何读取 MATLAB 生成的数据包中的数据。

数据包 (data1) 只有 6 个字节，但如何以整数形式访问每个单独的元素？

我以前从未接触过 MATLAB 编程，所以我有点迷失。

附带问题：MATLAB 的数据格式 %c、%s、%c\n 和 有何作用>%s\n 是什么意思？我试着寻找它，但我什么也没找到。

原文

I'm trying to interface a digital sensor to my computer via MATLAB.

I first send a request for data to the sensor, then the sensor replies with a six byte stream.

MATLAB reads the sensor like this:

data1 = fscanf(obj1, '%c', 6);

I know exactly what the contents of the data is supposed to be, but I don't know how to read the data in the packet that MATLAB produced.

The packet (data1) is simply 6 bytes, but how do I access each individual element as an integer?

I've never touched MATLAB programming before so I'm kind of lost.

Side question: What do MATLAB's data formats %c, %s, %c\n, and %s\n mean? I tried searching for it, but I couldn't find anything.

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掩于岁月 2024-08-18 23:03:14

格式说明符 %c 表示 FCANF 正在读取六个字符。您应该能够使用 DOUBLE 将这些字符转换为整数值函数：

data1 = double(data1);

现在 data1 应该是一个包含整数值的六元素数组。您可以通过索引到数组来访问每个内容：

a = data1(1);  %# Gets the first value and puts it in a

如果您想要组合 data1 中的一对值，使一个值代表数字的最高 8 位，一个值代表最低 8 位，则以下内容应该可行：

a = int16(data1(1)*2^8+data1(2));

上面使用 data1(1 ) 作为高位，data1(2) 作为低位，然后将结果转换为 INT16 类型。您还可以停止对 INT16 的调用，而将结果保留为 DOUBLE 类型（它存储的值仍然是整数）。

格式说明符 %s 用于读取字符串，直到遇到空格为止。我在上面链接到的 FCANF 文档中讨论了格式说明符。

The format specifier %c indicates that FSCANF is reading six characters. You should be able to convert those characters to integer values using the DOUBLE function:

data1 = double(data1);

Now data1 should be a six-element array containing integer values. You can access each by indexing into the array:

a = data1(1);  %# Gets the first value and puts it in a

If you want to combine pairs of values in data1 such that one value represents the highest 8 bits of a number and one value represents the lowest 8 bits, the following should work:

a = int16(data1(1)*2^8+data1(2));

The above uses data1(1) as the high bits and data1(2) as the low bits, then converts the result to an INT16 type. You could also leave off the call to INT16 to just leave the result as type DOUBLE (the value it stores would still be an integer).

The format specifier %s is used to read a string of characters, up until white space is encountered. Format specifiers are discussed in the documentation for FSCANF that I linked to above.

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