deva.c

/*
 
     File: deva.c
 Abstract: n/a
  Version: 1.0
 
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*/
 
// Some functions to talk to the DevaSys  <http://www.devasys.com> "USB I2C/IO,Ê Interface Board"
// These come in 2 flavors DevaFuncName and DevaFuncNameD. The two sets are functionally identical
// but take either a device (USBDeviceInterface) object (the "D" functions 
// or an Interface (USBInterfaceInterface) object to work on. 
//
// Currently defined functions are:
// 
//    IOReturn DevaSetIoPortsConfig(IOUSBDeviceInterface245 **dev, UInt32 portBits);
//    IOReturn DevaReadIoPorts(IOUSBDeviceInterface245 **dev, UInt32 *portBits);
//    IOReturn DevaWriteIoPorts(IOUSBDeviceInterface245 **dev, UInt32 portBits, UInt32 mask);
// 
// They operate on the 20 programmable IO bits which appear on the IO connector.
// The port bits are mapped as 0x000CBBAA (with the 4 C bits shifted down 4 bits)
// 
// DevaSetIoPortsConfig sets the 20 programmable IO ports to either Input or Output.
// Bits which are 0 are configured as output, bits which are 1 are configured as
// Input. (Mneumonic, 0 looks like 'O', 1 looks like "I".)
// 
// DevaReadIoPorts reads the state of the IO pins. The state of both inputs and
// outputs are read. Outputs should reflect the state they were last set to
// (unless you have an horrendous load on them).
// 
// DevaWriteIoPorts sets the state of any output bits. Only bits which have
// their corresponding mask bit set are affected, and of course only bits
// which had previously been configured as output can do anything.
// 
// if you set the symbol NARRATEIO to non zero, a message will be printed  for
// every IO attempt.
 
 
#include <IOKit/IOCFPlugIn.h>
#include <IOKit/usb/IOUSBLib.h>
#include "deva.h"
#include "printInterpretedError.h"
#include <stdio.h>
 
#define NARRATEIO 1
 
IOReturn DevaSetIoPortsConfig(IOUSBInterfaceInterface245 **intf, UInt32 portBits)
{
IOUSBDevRequest req;
IOReturn err;
 
    req.bmRequestType = USBmakebmRequestType(kUSBOut, kUSBVendor, kUSBDevice);
    req.bRequest = 0xF0; // SetIoPortsConfig
    req.wValue = 0; // unused
    req.wIndex = 0; // unused
    req.wLength = 4; // 32bit int
    req.pData = &portBits;
    
    portBits = HostToUSBLong(portBits);
            //   000CBBAA <-port mappings
            // 1 is Input (looks like I, 0 is output, looks like O)
#if NARRATEIO
printf("Doing SetIoPortsConfig with portbits %08x\n", USBToHostLong(portBits));
#endif
 
    err = (*intf)->ControlRequest(intf, 0, &req);
    if (kIOReturnSuccess == err) 
    {
        if(req.wLenDone != 4)
        {
            err = kIOReturnUnderrun;
        }
    }
    return(err);
}
 
IOReturn DevaReadIoPorts(IOUSBInterfaceInterface245 **intf, UInt32 *portBits)
{
IOUSBDevRequest req;
IOReturn err;
 
    req.bmRequestType = USBmakebmRequestType(kUSBIn, kUSBVendor, kUSBDevice);
    req.bRequest = 0xF1; // ReadIoPorts
    req.wValue = 0; // unused
    req.wIndex = 0; // unused
    req.wLength = 4; // 32bit int
    req.pData = portBits;
    
    *portBits = -1;
            //   000CBBAA <-port mappings
            // 1 is Input (looks like I, 0 is output, looks like O)
    
#if NARRATEIO
printf("Doing ReadIoPorts with portbits %08x\n", USBToHostLong(*portBits));
#endif
    err = (*intf)->ControlRequest(intf, 0, &req);
    if (kIOReturnSuccess == err) 
    {
        if(req.wLenDone != 4)
        {
            err = kIOReturnUnderrun;
        }
        else
        {
            *portBits = USBToHostLong(*portBits);
        }
    }
    return(err);
}
 
 
IOReturn DevaWriteIoPorts(IOUSBInterfaceInterface245 **intf, UInt32 portBits, UInt32 mask)
{
 
struct {
    UInt32 portBits;
    UInt32 maskBits;
    }writeBits;
IOUSBDevRequest req;
IOReturn err;
 
    req.bmRequestType = USBmakebmRequestType(kUSBOut, kUSBVendor, kUSBDevice);
    req.bRequest = 0xF1; // WriteIoPorts
    req.wValue = 0; // unused
    req.wIndex = 0; // unused
    req.wLength = 8; // 32bit int
    req.pData = &writeBits;
    
    writeBits.portBits = HostToUSBLong(portBits);
    writeBits.maskBits = HostToUSBLong(mask);
                    //     000CBBAA <-port mappings
                    // 1 is Input (looks like I, 0 is output, looks like O)
#if NARRATEIO
printf("Doing WriteIoPorts with portbits %08x, %08x\n", USBToHostLong(writeBits.portBits), USBToHostLong(writeBits.maskBits));
#endif
   
    err = (*intf)->ControlRequest(intf, 0, &req);
    if (kIOReturnSuccess == err) 
    {
        if(req.wLenDone != 8)
        {
            err = kIOReturnUnderrun;
        }
    }
    return(err);
}
 
 
IOReturn DevaSetIoPortsConfigD(IOUSBDeviceInterface245 **dev, UInt32 portBits)
{
IOUSBDevRequest req;
IOReturn err;
 
    req.bmRequestType = USBmakebmRequestType(kUSBOut, kUSBVendor, kUSBDevice);
    req.bRequest = 0xF0; // SetIoPortsConfig
    req.wValue = 0; // unused
    req.wIndex = 0; // unused
    req.wLength = 4; // 32bit int
    req.pData = &portBits;
    
    portBits = HostToUSBLong(portBits);
            //   000CBBAA <-port mappings
            // 1 is Input (looks like I, 0 is output, looks like O)
#if NARRATEIO
printf("Doing SetIoPortsConfigD with portbits %08x\n", USBToHostLong(portBits));
#endif
    err = (*dev)->DeviceRequest(dev, &req);
    if (kIOReturnSuccess == err) 
    {
        if(req.wLenDone != 4)
        {
            err = kIOReturnUnderrun;
        }
    }
    return(err);
}
 
IOReturn DevaReadIoPortsD(IOUSBDeviceInterface245 **dev, UInt32 *portBits)
{
IOUSBDevRequest req;
IOReturn err;
 
    req.bmRequestType = USBmakebmRequestType(kUSBIn, kUSBVendor, kUSBDevice);
    req.bRequest = 0xF1; // ReadIoPorts
    req.wValue = 0; // unused
    req.wIndex = 0; // unused
    req.wLength = 4; // 32bit int
    req.pData = portBits;
    
    *portBits = -1;
            //   000CBBAA <-port mappings
            // 1 is Input (looks like I, 0 is output, looks like O)
    
#if NARRATEIO
printf("Doing ReadIoPortsD with portbits %08x\n", USBToHostLong(*portBits));
#endif
    err = (*dev)->DeviceRequest(dev, &req);
    if (kIOReturnSuccess == err) 
    {
        if(req.wLenDone != 4)
        {
            err = kIOReturnUnderrun;
        }
        else
        {
            *portBits = USBToHostLong(*portBits);
        }
    }
    return(err);
}
 
 
IOReturn DevaWriteIoPortsD(IOUSBDeviceInterface245 **dev, UInt32 portBits, UInt32 mask)
{
 
struct {
    UInt32 portBits;
    UInt32 maskBits;
    }writeBits;
IOUSBDevRequest req;
IOReturn err;
 
    req.bmRequestType = USBmakebmRequestType(kUSBOut, kUSBVendor, kUSBDevice);
    req.bRequest = 0xF1; // WriteIoPorts
    req.wValue = 0; // unused
    req.wIndex = 0; // unused
    req.wLength = 8; // 32bit int
    req.pData = &writeBits;
    
    writeBits.portBits = HostToUSBLong(portBits);
    writeBits.maskBits = HostToUSBLong(mask);
                    //     000CBBAA <-port mappings
                    // 1 is Input (looks like I, 0 is output, looks like O)
#if NARRATEIO
printf("Doing WriteIoPortsD with portbits %08x, %08x\n", USBToHostLong(writeBits.portBits), USBToHostLong(writeBits.maskBits));
#endif
   
    err = (*dev)->DeviceRequest(dev, &req);
    if (kIOReturnSuccess == err) 
    {
        if(req.wLenDone != 8)
        {
            err = kIOReturnUnderrun;
        }
    }
    return(err);
}


Copyright © 2009 Apple Inc. All Rights Reserved. Terms of Use | Privacy Policy | Updated: 2009-08-21