How to use spi to write and read some specfic register address

Sun 2019.11.03

'I would prefer reading the data without any interruption for hours'

@user101931

Note that there isn't the function setTimeout() in the code snipit provided

It appears the setTimeout() found in link in #12 is allowing everything to settle before executing the function. Maybe it is setInterval() that will repetitively call the function, after the timeout duration is over, perhaps?

http://www.espruino.com/Reference#l__global_setInterval

Tutorial

https://www.w3schools.com/js/js_timing.asp

' I am wondering if there is a way to do it without pause the program?'

Would a better tutorial assist here?

http://www.espruino.com/Data+Collection
http://www.espruino.com/Tutorials

From #11

'but I actually set SPI transmission rate to 10 MHz'

Is hardware or software SPI in use?

See Note: "baud:integer=100000, // ignored on software SPI"
http://www.espruino.com/Reference#l_SPI_setup

'Figure 3 shows the error I am getting and the program crashed.'

"Prompt not detected - Upload failed"

Was code on the Right-hand editor side of the WebIDE being uploaded while the * while{} * loop was still executing?

EDIT:

After thinking this through, I believe the while loop is executing faster than the SPI send-response can keep up. Using setInterval() instead of the loop would be a better practice. See the data collection logging tutorial link above.

The following paragraph may not apply then.

In the code block in #11, variable start is never re-evaluated or re-assigned. Loop execution would be unpredictable. Infinitely fast looping until 20 seconds have elapsed. Also in line tm = readtime() the function definition is not present. Please upload all code using the following:

I placed instructions for easy code insertion within each post at the end of #10. Including that way will allow us to block copy your code and comments from hilighting using Ctrl+C right here in the forum edit window. We would have line numbers to reference as well. Would greatly assist us.