Hello, I need to combine this 3 coding to form one whole PWM system by using FPGA. But, I stuck and don't know how to combine it. Please help me. Thank you.
You have to learn about structural description by using instantiations and port maps. See: https://www.doulos.com/knowhow/vhdl_designers_guide/components_and_port_maps/ http://www.tau.ac.il/~flaxer/edu/course/vhdl/slides/VHDL08.pdf
typically the content of the error message will give you a hint, how you can avoid the error. So next time please post the error message, which gives you trouble. Regarding your code: you have instantiated your component, but you did not declare it. Have a closer look at the examples FPGAKüchle linked. Especially the lines between "architecture" and "begin"
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I already edited it, and it still have an error. This is the new code.
and this is the only error message you get? Then it looks like your development system found the component FreqDivider200Hz in work, but it did not find FreqDivider400Hz. If I were in your place I would check, why FreqDivider200Hz was addedd successfully but FreqDivider400Hz was not. By the way: if you want plan to use the divided Clocks as real clock signal in a real hardware lateron, it will never run reliable. (for simulation only it should run fine). Don't misuse logic signals as a clock signal. If you want to slow down your PWM, use Clock-Enables instead of divided clocks.
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