How to read data from a 24-bit ADC over SPI and Arduino Uno

I have a 24-bit ADC MCP3550 and I want to read a voltage value over SPI and Arduino Uno. The slave (MCP3550) can only send information over the SDO-line.

There a few examples how to write and read over SPI using Arduino and Raspberry PI.

https://www.mathworks.com/help/supportpkg/raspberrypiio/examples/analog-input-using-spi.html

https://www.mathworks.com/examples/matlab/mw/arduinoio_product-SPIPotentiometerExample-communicate-with-spi-device-on-arduino-reg-hardware

I still cannot understand how to read the voltage value over the SPI protocol on this particular ADC. From Bit 20 to bit 0, the output code is given MSb first (MSb is bit 20 and LSB is Bit 0).

Here is the code:

a = arduino('com1', 'uno', 'Libraries', 'SPI');
MCP3550 = spidev(a,'D10','Mode',1,'BitOrder','msbfirst','Bitrate',4000000);

for x = 1:1:50                                            % I'd like to read 50 values
  data = writeRead(MCP3550,[1, bin2dec('10000000'), 10]); % I have copied this and the following two rows from the Raspberry Pi tutorial
  highbits = bitand(data(2), bin2dec('11'));  
  voltage = double(bitor(bitshift(highbits, 8), data(3)));    
  voltage1 = (2.5/4194304) * voltage;                     % 2.5V ref and 22-bit conversion
end

clear MCP3550 a

[Astarag Chattopadhyay]

Can you please state the exact issue you are facing here? If you are getting any particular error share the corresponding screenshots.