using parallel port to interface spi devices

[alaayesh]

Hi all,

i have a problem with analog switches with a 3 wire spi interface, and am intending to use parallel port to interface these switches, and am using vb.net.
Is this possible

please help!!!!!!!!!!

 

[MikeMl]

A qualified Yes. SPI shouldn't care if there is pause in the middle of a clock. The reality of doing anything with the Parallel Port on a Windoz box is that there will be long pauses (up to several ms, due do to system interrupts) where your bit-banging at the PP will just sit waiting for the CPU. It will drive you nuts looking at the PP signals with a scope. In fact, you will need a digital scope to debug your interface...

 

[ericgibbs]

Hi all,

i have a problem with analog switches with a 3 wire spi interface, and am intending to use parallel port to interface these switches, and am using vb.net.
Is this possible

please help!!!!!!!!!!

hi ,
As requested in your PM I have attached a zip file for a VB5 DVM module.
The program is used to control and read a MCP3204 4 channel 12bit ADC via the PC's parallel port.
It does work and is in regular use.

Extract the SPI subroutines to suit your application.