Sawtooth and square wave generation

P = 1e-3;

n = 200;

Ts = P/n;

x = 0:Ts:P-Ts;

f = 1/P;

y = cos(2 * pi * f * x);

y=y*2^7;

y=fix(y);

plot(x,y)

I need to generate waves for a project am doing with VHDL. I used the above code to get the sine wave with 200 points and the period (1e-3). I want to do the same for sawtooth and square waves but not sure what am doing wrong. When i try to edit the above code to fit the sawtooth and square i just get a straight line. What do i change to generate the sawtooth and the square?

Thanks in advance