You are receiving this because you commented. A 22 MHz SPIĬlock should be a good starting point many applications. My present usesĪre mostly to interface with a Windows 9x printer and scanner, so thereforeĪbout 0.120-0.360 microseconds latency is pretty good for me. Versatile Raspberry Pi parallel port for any future use.
High-frequency circuit design best practices are followed. This interface allows parallel RGB displays to be attached to the Raspberry Pi GPIO either in RGB24 (8 bits for red, green and blue) or RGB666 (6 bits per colour) or RGB565 (5 bits red, 6 green, and 5 blue).
To the timing delay introduced by the LPC bus or ISA bus, provided that DPI (Display Parallel Interface) is a 24-bit parallel interface with 28 clock and synchronisation signals. The maximum Raspberry Pi SPI clock speed of 125 MHz should be comparable Well since early 2000s "Windows XP" era PCs with a parallel port areĬonnected in a serialized fashion via the LPC bus to the Super I/O chip. On one hand, I assumed it should work pretty On Mon, at 3:56 PM Andrew Makousky wrote: In any case, I'm open to thoughts on this idea and thought I'd post it here. It may make more sense to add this as a second hardware interface option and maintain both in parallel rather than have this be a successor design. Though it should be easy to get a basic interface running, there may also be room for tweaking and optimizing the speed of the SPI interface above the basic results.
The driver changes would depend on which chip is selected. (I2C would also work, though it couldn't be as fast as SPI.) With the right chip or two, the hardware changes should be fairly simple. Of course, I've also been a relative novice with Raspberry Pi and embedded and now I realize that it should be fairly simple to connect the hardware interface through SPI via a GPIO port expander chip.
I've been looking at the pi-parport project for quite some time, but one thing that threw me off from using it was the number of GPIO pins the hardware interface required, which doesn't leave much room left for other peripherals. Check out Scali’s OpenBlog about the release of the CVX4 Covox Speech Thing clone (Available for purchase here.).