Rasberry Pi high precision AD/DA RB-Wav-08

The Waveshare user manual has you download API source code from airspayce.com/mikem/bcm2835

The manual then says (section 2.1) go to directory ADS1256. The bcm2835-1.55 download does not have this code/directory.

Where can I find it?
thanks

The software directory ADS1256 can be downloaded here which is also available in the Raspberry Pi High-Precision AD/DA Expansion Board Wiki