Introduction - If you have any usage issues, please Google them yourself
Source code to drive a Analog Devices AD9954 DDS (Direct Digital Synthesis) chip. from a 8051 microprocessor. AD9954 info here: http://www.analog.com/en/rfif-components/direct-digital-synthesis-dds/ad9954/products/product.html
Toolchain is the Keil uVision2 - C51 compiler project.