Honored Contributor
Honored ContributorFirst, lets talk about the USB-to-Serial board.
I guess you have no experience with hardware, since the reason it did not work is fairly obvious. When something does not work, the first thing you look for is "where does the power come from?". Look at the schematic on p2 zl1usb_b.pdf. FTDI devices can be powered from USB or from a local power source. If you opened an FTDI data sheet you would see the different ways to power the device. Looking at this board, you can see there is a VCC for power, and a VCCIO for output signal power. Table 1 indicates that VCC = 5V and VCCIO = 3.3V or 5V. I cannot read Polish, but it might even say that those voltages are required :) Without 5V and 3.3V, this particular board will not show up on the USB bus. VCC_SYS on the DE0-nano connector is derived from the 5V USB signal, so you can use that for VCC, and use the De0-nano VCC3P3 to power the 3.3V pins. That should be sufficient to get your FTDI device powered and recognized by your PC. The device will work fine under Windows 7. Now, regarding your coefficient logic. Your description is not very clear. Could you please post some example code, along with a testbench that is supposed to exercise the code. Cheers, Dave
