Changing buffer size

[allidir]

Hello,

I'm doing a project in my lab in which i need to generate a swept sine going from 100Hz to 10MHz, i'm using the generate function as a base but i don't have enough samples to have a good shape for the sine after 1MHz, and my signal is generated again and again without stoping, i tried many things to stop it but none worked.

1) Is there a way to change the buffer size to fit more samples in it?

2) How can i stop the RP from generating my signal once it arrives at the wanted frequency ?

Thanks,
Idir