On Oct 4, 2011, at 10:16 AM, Tijd Dingen wrote: > You mentioned wanting to use the parallel port under linux for pps purposes, > right?
Hi Fred, I consider it, but tvb's picPET's will work much better for the project. > So if some parallel port programming is acceptable, then you can do the > following: > - get an adc with SPI bus (which means plenty of choice) > - connect the 3 SPI wires to parallel port > - bitbang spi (just google "bitbang spi" and you'll find example code. it's > pretty simple to do yourself and a fairly forgiving protocol (timing wise)) I like SPI as well and have done a fair bit of AVR bit banging. Doing it though the parallel port is intriguing. > Alternatively you could use a microcontroller with both spi and uart > (microchip and atmel have plenty), and use that to serve as uart <--> spi > bridge. Or for something like a 10 bit ADC you can use the internal adc of > the MCU. I'm leaning toward an ATMega168 which has a USART and a TWI interface, so simplify programming and work at the byte rather than bit level. > - get an ADS1258EVM board for about $50 > - bring your own supply voltage > - bitbang spi on the parallel port > - bitbang i2c on the parallel port (this is optional for this board, not > strictly needed) That's a nice board. I ended up ordering the PDK version which comes with a some other features including a USB interface so can skip worrying about having a parallel port on whatever system I'll be using the ADS1258EVM with. Creating a fpga interface like you did is a fine idea, but I'll end up trading some dollars for time with the PDK version. Kevin _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
