sine function on 16-bit microcontroller

Question

I need to generate a sine wave to fill a char table of size 1024. The word size on the microcontroller is 16-bit and floating-point operations are not available.

The sine wave itself will oscillate between the value of 0 to 255, with 127 being the center point.

Any ideas?

Answer 1

You only actually need to store one quarter of the sine wave -- you can lookup the other three quarters from the first quadrant. So you only need 256 bytes.

To generate the values on the micro controller, implement CORDIC. You can store one value, and generate the whole sine wave from that.