SPI with ADC7066 (TI Chip)

Projects Programming
2

I'm assuming from the const int CS = 53; that this is being done on a Mega. But it really doesn't matter, as the provided sketch doesn't compile.

arduino-cli compile -b arduino:avr:mega:cpu=atmega2560 --warnings all --output-dir /home/me/tmp --no-color (in directory: /home/me/Documents/sketchbook/Mega/test)
/home/me/Documents/sketchbook/Mega/test/test.ino: In function 'void loop()':
/home/me/Documents/sketchbook/Mega/test/test.ino:18:1: error: 'writeReg1' was not declared in this scope
 writeReg1(0x11,0x06);
 ^~~~~~~~~
/home/me/Documents/sketchbook/Mega/test/test.ino:21:39: error: a function-definition is not allowed here before '{' token
   void writeReg1 (byte Add, byte mask){
                                       ^
/home/me/Documents/sketchbook/Mega/test/test.ino:38:1: error: expected '}' at end of input
 }
 ^
Used library Version Path
SPI          1.0     /home/me/.arduino15/packages/arduino/hardware/avr/1.8.3/libraries/SPI
Used platform Version Path
arduino:avr   1.8.3   /home/me/.arduino15/packages/arduino/hardware/avr/1.8.3
Error during build: exit status 1
Compilation failed.