fpga - NIOS II system + PWM logic -

i quite new designing systems fpgas, vhdl , nios ii , first post in forum.

i trying develop system nios ii system + pwms developed using vhdl. problema not sure how control pwms modelues system mean, how create signals comunicate vhdl logic nios ii system.

first though pio seem used comunicate fpga external devices.

another issue have not sure how use uart implemented qsys , how develop application in c. don't know diferrent commands or directives send or receive data. saw , write 1 example web found quite simple , doesn't provide enough info application.

can this??

thanks! omar

two options there,

1. declaring pio, said earlier, work
2. avalon interface communicate.

for avalon protocol, either can written understanding same or use template provided.

altera providing avalon memory mapped template easier use.

https://www.altera.com/support/support-resources/design-examples/intellectual-property/embedded/nios-ii/exm-avalon-memory-slave.html