Thanks for all your help
Now the communication is working, I can read data from my Peripheral. I had problems with the software in my microcontroller.
Now I'd like to use interrupts, but it doesnot work. I put "irq=auto", but select() never comes back. I can read data using read(), and I can read as many data as I want there is no problem.
I have a logic analyzer, and there should be an IRQ because PeriphClk (nAck) goes low to initiate the transfer. How can I enable them ? I saw functions in the parport-lowlevel.txt so can I do it through ppdev or is that made automatically ?
When the interrupts will be enabled, will the FIFO be used ? Can I set up the interrupt to occur only when the FIFO is full ?
Thank you very much, I tried to find those answers on the net and on the documentation but I didnot found anything
here is my dmesg :
0x378: FIFO is 16 bytes
0x378: writeIntrThreshold is 8
0x378: readIntrThreshold is 8
0x378: PWord is 8 bits
0x378: Interrupts are ISA-Pulses
0x378: ECP port cfgA=0x10 cfgB=0x00
0x378: ECP settings irq=<none or set by other means> dma=<none or set by other means>
parport0: PC-style at 0x378 (0x778), irq 7 [PCSPP,TRISTATE,COMPAT,ECP]
parport0: cpp_daisy: aa5500ff87(b8)
parport0: assign_addrs: aa5500ff87(b8)
parport0: cpp_daisy: aa5500ff(18)
parport0: assign_addrs: aa5500ff(18)
parport_pc: Via 686A parallel port: io=0x378, irq=7
ppdev: user-space parallel port driver
I hope it is the last time I am asking you something.....
PS : the speed is quite slow (about 30Ás for a byte, measured with my logic analyser) will the performances be better in interruptive mode ?
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