How do i read multiple bytes with one command on arduino?

Question

Philip Lorenz 2018-8-20

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https://ww2.mathworks.cn/matlabcentral/answers/415461-how-do-i-read-multiple-bytes-with-one-command-on-arduino

评论： Eric Prandovsky 2022-9-7

I have a CCS811 sensor and the bytes i need are in the same register (0x02), the datasheet says it can be up to 8bytes. there are no commands to read more than 2 bytes in the document, so is there another way than using:

readRegister(dev,[address],[precision])?

I only use the Arduino Toolbox for matlab right now.

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Eric Prandovsky 2022-9-7

Were you able to get this going? I noticed there is a driver for the CCS811 in the arduino support package for 2022a.

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Answer 1

Helper 2018-8-23

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https://ww2.mathworks.cn/matlabcentral/answers/415461-how-do-i-read-multiple-bytes-with-one-command-on-arduino#answer_333840

The 'read' function of i2cdev can be used. For more information please refer to the following documentation link https://www.mathworks.com/help/supportpkg/arduinoio/ref/read.html

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Walter Roberson 2021-12-8

Pommel Knight https://www.mathworks.com/matlabcentral/profile/authors/24894334 comments to Staff,

"Doesn't answer the question"

Walter Roberson 2021-12-8

@Pommel Knight:

The CCS811 sensor is connected by way of I2C bus according to https://learn.adafruit.com/adafruit-ccs811-air-quality-sensor

The page that staff linked to is specifically about a read() method for reading from I2C bus attached to Arduino, https://www.mathworks.com/help/supportpkg/arduinoio/ref/arduinoio.i2cdev.read.html and the read() method has a required argument that is the number of bytes to read.

Thus, using read(dev, 8) should return the 8 bytes that the poster needs.

Is this not an answer to the question?

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