SPWM component design based on Nios II core

It could improve the design efficiency and shorten the development cycle by the means of integrating various user-defined peripheral driver in the rule of Avalon bus in the SOPC system.The SPWM component with adjusted period and duty ratio has been achieved with hardware and software co-design method according to the Avalon bus specification in Nios II embedded systems, and it had been tested to meet the application requirements completely.