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Speed test of the TXT Controller via I2C bus timming | by fotoopa
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Speed test of the TXT Controller via I2C bus timming

Speed test of the TXT Controller via I2C readout.

All results are displayed on the PC monitor. Images are optimal for a UHD screen 3940x2160 pixels. 32 bytes of data are read out. If you leave the device open, all 32 bytes will be read without interruption. The total time for this is 770 usec. The test program has been written to investigate how fast new data can be read from the I2C bus. At the same time, all results are displayed on the screen. The TXT controller must convert all values to the display format and display them.

As a test I use:

16 FT Motors with speed setting, direction and enable visualization. 4 of these motors have an encoder counter whose value is displayed on the screen. The speed is adjustable between 0 and 100 for each motor. This speed is also shown on the display.

There is provision for 16 servo motors in which the position is read out, left or right. This is also displayed on the screen. Finally, there are 16 inputs that are also displayed.

 

Note that you can also switch between 8 and 16 bit data with an open device. If the slave is able to answer this number correctly, everything will be processed as a series without waiting loops. This greatly increases the transfer speed of the 32 bytes. The test indicates that there are 438 burst reads per second. The PC display shows the correct results during the tests.

 

If you want to work with a closed devive now, there will always be an interval between reading the separate data. This makes the reading speed considerably slower. We now obtain an average of 28 refresch cycles instead of 438 / sec. You see the hardware of the I2C device determines your result.

 

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Uploaded on May 9, 2018