Hello out there, I have a big problem. I try to access a Meilhaus me1400A-pci-board. This board owns three 82C54-timer which I want to use as a counter. To get more resolution I cascated the first two chips (controller0 and controller1) this is possible by the api which comes with the driver (this is available at sourceforge http://sourceforge.net/projects/meilhaus). What is not available there is a function to write and read from the cascated controllers. The usual function for writing on a 16bit 82C54 is called "me1400CntWrite". My solution of the problem looks like this: hiword = loadval >> 16; loword = loadval & 0xffff; if (( success = me1400CntWrite( 0, COUNTER01, MODE0, hiword + 1)) == 0) { me1400GetDrvErrMess(satz); printf ("Error while setting counter 1: %s\n", satz); exit(EXIT_FAILURE); } if (( success = me1400CntWrite( 0, COUNTER00, MODE2, loword + 1)) == 0) { me1400GetDrvErrMess(satz); printf ("Error while setting counter 0: %s\n", satz); exit(EXIT_FAILURE); } BUT the problem now is, there is something wrong with that modes. There are 6 different modes for the 82C54 and the counter should count down from my inital-value (maybe 10000) to 0. After it reaches the 0 it should shoot an interrupt and count further down to negative values. But as it seems that does not work properly, because if I read out the vallue inside my interrupt-service-routine (which is also the purpose of the measurement) then I get result like 0.0156 seconds and that is far too much for an interrupt! In hex a get some values like fffeb11d. Does anybody here has some experience with that 82C54 and know which mode I have to choose for counter0 and counter1. Thank you very much. hälsningar Christian -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
