SPI to USB
in [DSP]
|
From: Michael on 15 Aug 2005 12:16 Hello everbody I'm new in this group! I've got a few questions to this group. 1. Is it possible to convert SPI to USB with a data transfer rate of 2 Mbitps? And the same back USB to SPI. If it is not possible there is my second question. Can I save data on an external HardDisk. I want to develop a "Stand-Alone-Modul" which can save data for a measurement and after that I can transport the data to my Host pc. I hope you understand my questions. Thanks for help Michael
From: Al Clark on 15 Aug 2005 14:26 Michael.Reichlin(a)de.bosch-dot-com.no-spam.invalid (Michael) wrote in news:_oKdnc-gnbt6Ip3eRVn_vQ(a)giganews.com: > Hello everbody > > I'm new in this group! I've got a few questions to this group. > > 1. Is it possible to convert SPI to USB with a data transfer rate of 2 > Mbitps? And the same back USB to SPI. > > If it is not possible there is my second question. Can I save data on > an external HardDisk. I want to develop a "Stand-Alone-Modul" which > can save data for a measurement and after that I can transport the > data to my Host pc. > > I hope you understand my questions. > > Thanks for help > Michael > > SPI to USB is fairly easy if your device is not the host (master). You can get 2Mbits/second with a USB full (or high) speed device. Check out ftdichip.com for a suitable device. USB systems always have a host. This is usually a PC. Some devices act as both a host and USB peripheral. A typical camera might talk to a printer (where it is the host) and act as a peripheral when connected to a PC. There is a standard for this style of connection called USB-On-The-Go. This is much, much more difficult to implement. -- Al Clark Danville Signal Processing, Inc. -------------------------------------------------------------------- Purveyors of Fine DSP Hardware and other Cool Stuff Available at http://www.danvillesignal.com
From: Tim Wescott on 15 Aug 2005 14:26 Michael wrote: > Hello everbody > > I'm new in this group! I've got a few questions to this group. > > 1. Is it possible to convert SPI to USB with a data transfer rate of 2 > Mbitps? And the same back USB to SPI. > -snip- Yes, it is possible, but it's not much of a DSP task. Assuming that you have SPI coming out of something with some particular format it will probably require a fast microprocessor, an FPGA or both to do some translation. These would be good questions for sci.electronics.design, with questions on comp.embedded once you get your circuitry figured out. -- Tim Wescott Wescott Design Services http://www.wescottdesign.com
From: Michael on 16 Aug 2005 04:17 @Tim Thanks for your answer, but can you give me a tip which FPGA I have to use for translation? I don't have much experience with FPGA. @Al I searcher for FTDI but they can't tell me exactlly that it works. The FT2232C has the components that I need, but they are not sure if it works Michael
From: Al Clark on 16 Aug 2005 09:17 Michael.Reichlin(a)de.bosch-dot-com.no-spam.invalid (Michael) wrote in news:yoGdnR9vNJtiPZzeRVn_vQ(a)giganews.com: > @Tim > > Thanks for your answer, but can you give me a tip which FPGA I have to > use for translation? I don't have much experience with FPGA. > > @Al > I searcher for FTDI but they can't tell me exactlly that it works. The > FT2232C has the components that I need, but they are not sure if it > works > > Michael > > The FT2232C assumes that there is a SPI master. If you have a microcontroller of some kind, this is likely. What you are not going to do is hook up another SPI peripheral (like a serial flash) directly to the FT2232C. You could use a small micro such as a PIC or AVR for this purpose. If you need a small "helper" micro, then the FT245BM or FT232BM might be good choices as well since you don't need the USB interface to be specifically SPI in this case (the micro is the bridge). The very big issue with USB is the device driver. If a suitable device driver does not exist for your situation, you can spend lots of time or money creating one. -- Al Clark Danville Signal Processing, Inc. -------------------------------------------------------------------- Purveyors of Fine DSP Hardware and other Cool Stuff Available at http://www.danvillesignal.com
|
Next
|
Last
Pages: 1 2 Prev: What is the most effective way to do a zoom FFT Next: PWM generation using TMS320F2812 |