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  1. 3 likes
    The G2553 chip itself does not have USB support. You can go through the LaunchPad's "application"/"backchannel" UART; you firmware then just needs to write/read the UART. You also need an application on the host PC to read from one COM port and write to another. But why use USB? Why can't you control the solenoid directly from the LaunchPad?
  2. 1 like
    OK, I think I get it now. I new the rom_map.h header selected the hardware or software version, but I really didn't look into what it was doing. I was assuming it determined whether or not my rom could support it. Turns out, one must include the rom header before the rom_map header. If I do that (or replace MAP_ with ROM_), I don't need any delays to get it to work correctly....So I think Clavier is spot on. The flip side is that the rom version is significantly slower than the software versions. So I guess the price one is paying for a reduced code size, is speed? I guess I get that. 9/10 bytes 66 bytes pyCrc 13us 13us driverlib software Crc 11us 27us rom Crc 16us 74us
  3. 1 like
    @Dortal, As @Clavier noted, you should be able to fire the solenoid directly from the MSP430G2553, which would eliminate the likely significant communication latency the USB scenario you described would introduce. There are timer examples for the MSP that are analagous to your experiment which should not be too difficult to adapt. Re: USB support - You would need to use one of F5529 launchpads, which have native USB support (not as a as a controller, just as a USB device). There is a USB Developer's library via MSPWare with code examples. Bob