Assembly language program to generate triangular wave in 8051

How to generate a triangular wave using 8051 microcontroller and DAC?

Write an embedded C program to generate a triangular wave of frequency 1KHz using 8051 microcontroller and a DAC. Algorithm 1. Set port 1 as output port. 2. Initialize port 1 as 00 3. Go on incrementing value till max value is reached at port1, for the upward going part of the triangular wave. 4.