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Acces PCI-ICM422/2 User Manual
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PCI-ICM422/2(4) and 485/2(4) ManualPage 5-4 Manual MPCI-ICM4S.F1bThe handler would first read the Interrupt Identification Register at Base Address +2. If the interruptis for Received Data Available, the handler then reads the data. If no interrupt is pending, controlexits the routine. A sample handler, written in C, is as follows:readback = inportb(BASEADDR +2);if (readback & 4) /*Readback will be set to 4 if data are available*/data[i++]=inportb(BASEADDR);outportb(0x20,0x20); /*Write EOI to 8259 Interrupt Controller*/return;TransmissionRS485 transmission is simple to implement. The AUTO feature of the PCI-ICM422/485 cardautomatically enables the transmitter when data are ready to send. No software enabling is required.The following C code fragment demonstrates this process:while(data[i]); /*While there is data to send*/{while(!(inportb(BASEADDR +5)&0x20)); /*Wait until transmitter is empty*/outportb(BASEADDR,data[i]);i++;} |
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