CN103713908A - Method for designing digital quantity input functional unit driving program of CPCI (compact peripheral component interface) bus under VxWorks operating system - Google Patents

Abstract

The invention discloses a design method for a driver program of a CPCI bus digital quantity input function unit under the VxWorks operating system, and belongs to the field of development of a driver program of a digital quantity input function module. In order to solve the problem of developing the digital input module driver based on the CPCI bus under the traditional VxWorks operating system, the driver developer needs to abstract the data structure of the device, complete the complex process of creating the device and installing the device driver, and bring more benefits to the driver developer. A lot of inconveniences came. The digital input function module runs in the CPCI chassis, the application program runs on the control computer, and the control of the digital input function module is realized through the CPCI bus. The driver design of the digital input function module mainly includes the initialization device and the realization of the function interface and packaging. Realize the control of the digital input function module, directly define the form of the drive interface for the application program, and directly encapsulate the function interface function.

Description

Design method of CPCI bus digital input function unit driver under VxWorks operating system

technical field

The invention relates to a design method for a driver program of a CPCI bus digital quantity input function unit under a VxWorks operating system, and belongs to the field of development of a driver program of a digital quantity input function module.

Background technique

As an important test module in the automatic test system, the CPCI bus digital input function module under the VxWorks operating system has been widely used in various fields. Under the traditional VxWorks operating system, the development of the digital input module driver based on the CPCI bus is based on the need to realize the corresponding function interface and package it into a standard I/O interface (seven standard I/O interfaces, such as open (), close(), read(), etc.), registered in the system driver list, and mounted under the I/O subsystem. In the whole process, the driver developer needs to abstract the data structure of the device, complete the creation of the device and the installation of the device driver. This process is relatively complicated and brings a lot of inconvenience to the driver developer.

For the problems referred to above, the present invention proposes the driver program design and packaging of the CPCI bus digital input module under the VxWorks operating system, and according to the common operations to the digital input functional modules, proposes a new digital input driver interface packaging form, with While realizing the effective control of the digital input function module, it can greatly reduce the development difficulty of the driver developer.

Contents of the invention

The purpose of the invention is to invent a driver program design method of the CPCI bus digital input function module under the VxWorks operating system, so as to solve the traditional VxWorks operating system based on the digital input module driver development of the CPCI bus. The complex process of extracting the data structure of the device, completing the creation of the device and the installation of the device driver has brought a lot of inconvenience to the driver developer.

The technical scheme that the present invention takes for solving the problems of the technologies described above is:

A kind of CPCI bus digital input functional unit driver design method under VxWorks operating system, the concrete realization process of described method is:

Step 1. Initialize the device:

The process of initializing the device allocates system resources for the hardware, and obtains the device information, device memory map and interrupt link of the digital input function module based on the CPCI bus;

Step 2. Realization and encapsulation of functional functions:

The function function interface is used to realize the specific operation of the digital input function module, and the operation of the digital input function module mainly includes opening, closing and reading functions;

The main control process of the digital input function module is: the application program first executes the operation of opening the specified digital input module board, loads the driver program of the digital input module, and then calls the digital input acquisition interface, and the application program passes in the digital input module. The board number and channel number of the module enable the corresponding digital input channel to collect digital input; 32 digital inputs are controlled by two 16-bit registers;

After the system is powered on, the digital input module completes the memory mapping of the board, and implements each driver interface function according to the hardware register interface manual and the operations to be completed by each driver interface function. The specific process is as follows:

Step 2 (1), open the digital input function unit (digital input board): (see Table 1)

Load the digital input driver, open the digital input board with the specified board number to perform subsequent operations on the digital input board; clear the output channel of the digital input board;

The function prototype is STATUS IOOpen(int num),

The entry parameter num is the board number, the range is 1 to N, and N is the number of digital input boards of the control computer;

Return value Open successfully and return OK, fail to return a non-zero negative fault code;

The function can identify wrong board number input and return the corresponding fault code;

The implementation process of the IOOpen function is as follows:

First, the application passes the number of the digital input board to be opened, and judges whether the board number is correct in the function body. If it is correct, assign the base address value of the digital input board memory map obtained after the initialization function is executed to a global variable. Then clear each channel of the specified digital input board, and finally the function returns OK. If the board number parameter is not allowed by the user, it returns the board number error fault code.

Step 2 (2), close the digital input functional unit (digital input board):

Close the digital input board with the specified board number, uninstall the I/O driver, and release the hardware resources of the I/O board after completion, and no other operations can be performed on the I/O board except opening;

The function prototype is STATUS IOClose(int num);

The entry parameter num is the board number, the range is 1 to N, and N is the number of digital input boards of the control computer;

Return value Close successfully returns OK, fails to return a non-zero negative fault code;

The function can identify wrong board number input and return the corresponding fault code;

The implementation process of the IOClose function is as follows (as shown in Figure 4):

First, the application passes the specified digital input board number to be closed. In the function body, it is judged whether the passed board number parameter is correct. If it is correct, the global variable that holds the memory base address is cleared, and the function returns OK. If If the board number is wrong, it will return a board number error fault code.

Step 2 (3), digital input functional unit (digital input board) bit reading operation: (see Table 3)

Specify the board number of the digital input board, read the state of the specified input channel, and pass the result to the char type parameter pointer *pdata;

The function prototype is STATUS IOReadBit(int num,int chan,char*pdata)

The entry parameter num is the board number, the range is 1 to N, and N is the number of digital input boards of the control computer;

int chan is the channel number, assigned 0~M-1, M is the number of input channels of the digital input board;

char*pdata stores the reading result, the value is 0 or 1;

Return value If the reading is successful, it returns OK, and if it fails, it returns a non-zero negative fault code

The function can identify wrong board number input and return the corresponding fault code;

The implementation process of the IOReadBit function is as follows: (shown in Figure 5):

The implementation process of the DARevertData function is as follows:

Firstly, the application program transmits the digital input board number and channel number parameters for data input. In the function body, first judge whether the passed board number is the board number that the user allows to input, and if so, further judge the passed channel number Is it the channel number that the user is allowed to input? If so, read back the state value of the specified input channel and save it. The function returns OK, indicating that the user can read the state value of the specified input channel from the corresponding channel. If the above judgment process is negative, the exit function returns the corresponding error code.

Step 2 (4), digital input functional unit (digital input board) read byte operation: (see Table 4)

Specify the board number of the digital input board, read one byte of data with offset as the offset address, that is, the state of the 8-bit input channel, and pass the result to the char type parameter pointer *pdata;

The function prototype is STATUS IOReadByte(int num,int offset,char*pdata);

The entry parameter num is the board number, the range is 1 to N, and N is the number of digital input boards of the control computer;

Offset is the offset, assigned 0 to P-1, P is the number of input channels of the digital input board divided by 8;

Pdata is used to store the read results, the value is 00~FFH;

If the return value is successfully read, it returns OK, and if it fails, it returns a non-zero negative fault code;

The function can identify the wrong board number input and return the corresponding fault code; it can also identify the wrong offset and return the corresponding fault code;

The implementation process of the function IOReadByte is as follows:

Firstly, the application program transmits the digital input board number and offset parameter for data input. In the function body, first judge whether the passed board number is the board number that the user allows to input, and if so, further judge the passed channel Is the number the offset allowed by the user? If so, read back the state values of the specified 8 input channels and save them. The function returns OK, indicating that the user can read the state values of the specified input channels from the corresponding channels. If the above judgment process is negative, the exit function returns the corresponding error code.

Step 2 (5) Digital input functional unit (digital input board) reads all channels: (See Table 5)

Specify the board number of the digital input board, read the status of all input channels of a board, and put the result in the data buffer of the specified first address;

STATUS IOReadAll(int num,char*pbuf)

The entry parameter num is the board number, the range is 1 to N, and N is the number of digital input boards of the control computer;

Buffer is the first address, and the buffer size is determined according to the hardware and the actual channel number of the hardware;

If the return value is successfully read, it returns OK, and if it fails, it returns a non-zero negative fault code;

The function can identify wrong board number input and return the corresponding fault code;

The implementation process of the function IOReadAll is as follows:

Firstly, the application program transmits the digital input board number and the offset parameter for data input. In the function body, it first judges whether the passed board number is the board number that the user allows to input. If so, read back all the input channels. State value, and save, the function returns OK. If the above judgment process is negative, the exit function returns the corresponding error code.

Step 2 (6), real-time monitoring of the digital input functional unit (digital input board): (see Table 6)

On-site real-time monitoring of digital input boards with specified board numbers;

The function prototype is STATUS IORTWatch(int num);

The entry parameter num is the board number, the range is 1 to N, and N is the number of digital input boards of the control computer;

The return value monitoring returns OK if it is normal, and returns a non-zero negative fault code if it fails;

The function can identify wrong board number input and return the corresponding fault code;

The implementation process of the IORTWatch function is as follows:

First, the application transmits the board number of the specified digital input function unit. In the function body, judge whether the passed board number is the board number allowed by the user. If yes, the next step is to call the PciFindDevice() function to judge the return value of the PciFindDevice() function. Whether it is OK, if yes, the function interface returns OK. If the above judgment is negative, if the above judgment process is negative, the exit function returns the corresponding error code.

The concrete implementation process of described step 1 is:

Step 1 (1) Obtain the device information of the digital input function module based on the CPCI bus

After the PCI device is powered on, the BIOS configures the PCI device, and the BIOS of the target machine lists the found PCI device, Vendor ID, Device ID, device type, and assigned interrupt number information when it starts;

The initialization function first uses the function pciFindDevice() to find the corresponding device according to the device Vendor ID and Device ID, and scans the bus according to the Vendor ID, Device ID and the same device sequence number (there may be the same PCI device in a system) to find out where the device is located. BUS No, Device No, and Func No; then call the pciConfigInLong() and pciConfigInByte() functions to determine the register base address and interrupt number of the device according to the bus number, device number, and function number; then compare the base address with the I/O mask bit Get the real base address of the internal register on the board;

Step 1 (2) Device memory mapping

The user uses the standard MMU (memory management unit) provided by VxWorks to allocate the memory space of the PCI device; after specifying the base address and the size of the memory space, call the function sysMmuMapAdd() to configure the memory space to the MMU; complete the digital input function module After the device memory is mapped, the control of the device is realized by accessing the device memory;

Step one (3) break the link

In the VxWorks operating system, intConnect() is used to link the interrupt service routine (ISR), and pciIntConncet() is used to hook the interrupt. pciIntConncet() is defined in pciIntLib.c, and the header file pciIntLib.h is included when used. The interrupt vector ventor is obtained through INUM_TO_IVEC conversion ;

After the pciIntConnect() function is used to connect the interrupt with a specific C program under the VxWorks system, the function will associate the specified C function with the specified interrupt vector, and the address of the function will be stored in the interrupt vector. When the interrupt When that happens, the system will call said specific C program function, the Interrupt Service Routine.

The beneficial effects of the present invention are:

According to the characteristics of the digital quantity input functional module, the present invention develops the drive to realize the control of the digital quantity input functional module, and provides a new encapsulation form of the driving interface of the digital quantity input functional module, and directly defines the form of the driving interface for the application program. Direct encapsulation of functional interface functions. In this way, in the process of driver development, the design of device data structure, device creation and driver installation of traditional digital input function modules are not involved, which greatly reduces the development difficulty of driver developers. This advantage is manifested in the following aspects;

1), the digital input function module driver program provided by this method can realize the effective control of the function module;

2), the digital input function module driver program provided by this method directly provides a general driver function interface for the user application program;

3), the digital input function module driver design and packaging provided by this method greatly reduce the difficulty of driver development;

4) The design and packaging of the digital input function module driver program provided by this method are independent and versatile, and can be applied to other designs.

Description of drawings

Figure 1 is the overall architecture diagram of the digital input function module, Figure 2 is the initialization function flow chart, Figure 3 is the flow chart of opening the digital input board, Figure 4 is the process of closing the digital input board, Figure 5 is the digital input board read Bit operation program flow chart, Figure 6 is a digital input board read byte program flow chart, Figure 7 is a digital input board read full channel program flow chart, Figure 8 is a digital input board real-time monitoring diagram.

Detailed ways

Referring to Fig. 1 to Fig. 8, present embodiment is described in detail CPCI bus digital input functional unit driver design method under the VxWorks operating system of the present invention:

The overall architecture of the digital input functional module described in this embodiment is shown in Figure 1:

The digital input function module runs in the CPCI chassis, and the control computer realizes the reading and writing control of the digital input function module through the CPCI bus. The CPCI bus interface controller needs to be implemented between the CPCI bus and the digital input function circuit. The CPCI bus controller is realized by the PCI9054 interface chip of PLX Company, and converts the CPCI bus to the local bus. The PCI9054 interface chip is fully compatible with the PCI2.2 specification, and has high burst transmission rate, low price, and good versatility, which can effectively reduce the difficulty of development. The PCI9054 local bus terminal uses FPGA to realize bus interface decoding, and at the same time, FPGA internally designs control registers to realize the control of digital input functional circuits. The digital input function module is composed of 32 optocouplers. The external 32-channel digital input is input to FPGA after optocoupler isolation, and FPGA can detect the state of the input channel.

The design process of the digital input function module driver is as follows:

The digital input function module runs in the CPCI chassis, the application program runs on the control computer, and the control of the digital input function module is realized through the CPCI bus, so it is necessary to develop a driver for the digital input function module based on the CPCI bus. The driver program design of the digital input function module mainly includes initializing the device, realizing and encapsulating the function interface.

Step 1. Initialize the device

As an important part of CPCI device driver development, the initialization device is mainly to allocate system resources for the hardware. Here, it is mainly to obtain the device information, device memory map and interrupt link of the digital input function module based on the CPCI bus.

(1) Obtain the device information of the digital input function module based on the CPCI bus

After the PCI device is powered on, the BIOS configures the PCI device. When the BIOS of the target machine starts, there will be an interface listing the found PCI devices, Vendor ID, Device ID, device type, assigned interrupt number and other information.

The initialization function first uses the function pciFindDevice() to find the corresponding device according to the device Vendor ID and Device ID, and scans the bus according to the Vendor ID, Device ID and the same device sequence number (there may be the same PCI device in a system) to find out where the device is located. The BUS No. (bus number), Device No. (device number) and Func No. (function number) of the Then call the pciConfigInLong() and pciConfigInByte() functions according to the bus number, device number and function number to determine the register base address and interrupt number of the device. Then compare the base address with the I/O mask phase to obtain the real base address of the internal register on the board. The initialization function flow is shown in Figure 2 below.

(2) Device memory mapping

VxWorks provides a standard MMU (Memory Management Unit), users can use MMU to allocate memory space of PCI devices. After specifying the base address and the size of the memory space, call the function sysMmuMapAdd() to configure the memory space to the MMU. After completing the device memory mapping of the digital input function module, the device can be controlled by accessing the device memory.

(3) Broken link

In the VxWorks operating system, intConnect() is used to connect the interrupt service routine (ISR), but for CPCI devices, pciIntConncet() is generally used to connect interrupts. The main difference between it and intConnect() is that the interrupt vector used by intConnect() is exclusive. And pciIntConncet () can make multiple external interrupts share an interrupt vector. pciIntConncet() is defined in pciIntLib.c, and the header file pciIntLib.h should be included when used. It should be noted that ventor is an interrupt vector and needs to be obtained through INUM_TO_IVEC conversion.

After using the pciIntConnect() function to connect the interrupt with a specific C program under the VxWorks system, this function will link the specified C function with the specified interrupt vector, and the address of the function will be stored in this interrupt vector. When an interrupt occurs, the system will call this specific C program function, the interrupt service routine.

Step 2. Realization and encapsulation of functional interface

The function function interface is used to realize the specific operation of the digital input function module. For the operation of the digital input function module, the common functions mainly include opening, closing and reading.

The main control process of the digital input function module is: the application program first executes the operation of opening the specified digital input module board, loads the driver program of the digital input module, and then calls the digital input acquisition interface, and the application program passes in the digital input module. Input the board number and channel number of the module, enable the corresponding digital input channel, and collect digital input. The 32 digital inputs are controlled by two 16-bit registers.

After the system is powered on, the digital input module completes the memory mapping of the board, and implements each driver interface function according to the driver hardware register interface manual provided by the hardware designer and the operations to be completed by each driver interface function.

(1) Turn on the digital input board, see Table 1

Table 1 Open the digital input board

The program flow chart is shown in Figure 3 below;

(2), close the digital input board, see Table 2;

Table 2 Close the digital input board

The program implementation process is shown in Figure 4 below;

(3) Bit reading operation of the digital input board, see Table 3;

Table 3 Digital input board read bit operation

The program implementation flow is shown in Figure 5 below;

(4) Read byte operation of digital input board, see Table 4;

Table 4 Digital input board read byte operation

The program implementation flow is shown in Figure 6 below;

(5), digital input board read full channel operation, see Table 5;

Table 5 Digital input board read full channel operation

The program implementation process is shown in Figure 7 below;

(6) Real-time monitoring of the digital input board, see Table 6;

Table 6 I/O board real-time monitoring

The program flow is shown in Figure 8 below.

Claims (2)

1. a cpci bus digital quantity input function unit drives Programming Methodology under vxworks operating system, is characterized in that, the specific implementation process of described method is:

Step 1, initialization apparatus:

Initialization apparatus process is hardware distributing system resource, obtains facility information, device memory mapping and the Break Link of the digital quantity input functional module based on cpci bus;

The realization of step 2, power function and encapsulation:

Power function interface is used for realizing the concrete operations to digital quantity input functional module, for the operation of digital quantity input functional module, mainly contains and opens, closes and read functions;

The major control process of digital quantity input functional module is: first application program carries out the operation of opening designation number amount load module board, load the driver of digital quantity input module, then call number amount is inputted acquisition interface, application program is imported plate number and the channel number of digital quantity input module into, enable corresponding digital quantity input channel, gather digital quantity input; 32 railway digital amount inputs are controlled by 2 16 bit registers;

Digital quantity input module, after system powers on, completes the memory-mapped of board, and according to the register interface handbook of hardware and each operation that drives interface function to complete, each drives interface function to carry out specific implementation, and detailed process is:

Step 2 (1), open digital quantity input function unit:

Load digital quantity input driver, open the digital input of given plate number, so that digital input is carried out to subsequent operation; The output channel of digital input is carried out to zero clearing;

Function prototype is STATUS IOOpen (int num),

Suction parameter num is plate number, and scope is 1～N, and N is for controlling the digital input quantity of computing machine;

Rreturn value is opened and is successfully returned to OK, unsuccessfully returns to non-zero negative value diagnostic trouble code;

Number input of the plate of described function energy identification error, and return to corresponding diagnostic trouble code;

The implementation procedure of IOOpen function is as follows:

First the digital input card number that application passes will be opened, in function body, judge whether plate is number correct, if correct, the digital input card memory-mapped base value obtaining after initialization function is carried out is assigned to a global variable, again to each passage zero clearing of designation number amount input card, last function returns to OK, if not being user, plate parameter do not allow, Returning plate fault code;

Step 2 (2), close digital quantity input function unit:

Close the digital input of given plate number, unloading I/O driver, discharges the hardware resource of I/O plate after completing, can not other operations except opening to I/O plate again;

Function prototype is STATUS IOClose (int num);

Suction parameter num is plate number, and scope is 1～N, and N is for controlling the digital input quantity of computing machine;

Rreturn value is closed and is successfully returned to OK, unsuccessfully returns to non-zero negative value diagnostic trouble code;

Number input of the plate of described function energy identification error, and return to corresponding diagnostic trouble code;

The implementation procedure of IOClose function is as follows:

First the designation number amount tablet card number that application passes will be closed, in function body, whether the plate parameter that judgement is transmitted is correct, if correct, will preserve the global variable zero clearing of memory base address, function returns to OK, if plate card number mistake, Returning plate fault code;

Step 2 (3), the operation of digital quantity input function unit read bit:

The plate number of designation number amount tablet, reads the state of specifying a road input channel, and result is passed to char type parameter pointer * pdata;

Function prototype is STATUS IOReadBit (int num, int chan, char*pdata)

Suction parameter num is plate number, and scope is 1～N, and N is for controlling the digital input quantity of computing machine;

Int chan is channel number, assignment 0～M-1, the input channel quantity that M is digital input;

Char*pdata deposits reading result, and value is 0 or 1;

Rreturn value reads successfully returns to OK, unsuccessfully returns to non-zero negative value diagnostic trouble code

Number input of the plate of described function energy identification error, and return to corresponding diagnostic trouble code;

The implementation procedure of IOReadBit function is as follows:

The implementation procedure of DARevertData function is as follows:

First application passes will be carried out digital input card number and the channel number parameter of data input, in function body, whether the plate that first judgement is transmitted number is the plate number that user allows input, if so, more further judge whether the channel number transmitting is the channel number that user allows input, if, the state value of input channel is specified in retaking of a year or grade, and preserve, function returns to OK, represents that user can read the state value of specifying input channel from corresponding passage; If the process of above-mentioned judgement occurs negating to exit function and return to corresponding fault code;

Byte manipulation is read in step 2 (4), digital quantity input function unit:

The plate number of designation number amount tablet, the data that the offset of take is a byte of side-play amount address read, i.e. the state of 8 input channels, and result is passed to char type parameter pointer * pdata;

Function prototype is STATUS IOReadByte (int num, int offset, char*pdata);

Suction parameter num is plate number, and scope is 1～N, and N is for controlling the digital input quantity of computing machine;

Offset is side-play amount, assignment 0～P-1, and the input channel quantity that P is digital input is divided by 8;

Pdata is for storing the result reading, value 00～FFH;

Rreturn value reads successfully returns to OK, unsuccessfully returns to non-zero negative value diagnostic trouble code;

Number input of the plate of described function energy identification error, and return to corresponding diagnostic trouble code; Side-play amount that can also identification error, and return to corresponding diagnostic trouble code;

The implementation procedure of function IOReadByte is as follows:

First application passes will be carried out digital input card number and the offset parameter of data input, in function body, whether the plate that first judgement is transmitted number is the plate number that user allows input, if so, more further judge whether the channel number transmitting is the side-play amount that user allows input, if, the state value of 8 tunnel input channels is specified in retaking of a year or grade, and preserve, function returns to OK, represents that user can read the state value of specifying input channel from corresponding passage; If the process of above-mentioned judgement occurs negating to exit function and return to corresponding fault code;

Full tunnel operation is read in step 2 (5) digital quantity input function unit:

The plate number of designation number amount tablet, reads the state of all input channels of plate, and result is placed in the data b uffer that specifies first address;

STATUS?IOReadAll(int?num,char*pbuf)

Suction parameter num is plate number, and scope is 1～N, and N is for controlling the digital input quantity of computing machine;

Buffer is first address, and buffer size is fixed according to hardware physical channel number according to hardware;

Rreturn value reads successfully returns to OK, unsuccessfully returns to non-zero negative value diagnostic trouble code;

Number input of the plate of described function energy identification error, and return to corresponding diagnostic trouble code;

The implementation procedure of function IOReadAll is as follows:

First application passes will be carried out digital input card number and the offset parameter of data input, and in function body, whether the plate that first judgement is transmitted number is the plate number that user allows input, if, the state value of all input channels of retaking of a year or grade, and preserve, function returns to OK; If the process of above-mentioned judgement occurs negating to exit function and return to corresponding fault code;

Step 2 (6), digital quantity input function unit Real-Time Monitoring:

Digital input to the plate of appointment number carries out Real-Time Monitoring in place;

Function prototype is STATUS IORTWatch (int num);

Suction parameter num is plate number, and scope is 1～N, and N is for controlling the quantity of the digital input of computing machine;

OK is normally returned in rreturn value monitoring, unsuccessfully returns to non-zero negative value diagnostic trouble code;

Number input of the plate of described function energy identification error, and return to corresponding diagnostic trouble code;

The implementation procedure of IORTWatch function is as follows:

First application passes designation number amount input function cell board number, in function body, whether the plate number that judgement is transmitted is the plate number that user allows, if, next step calls PciFindDevice () function, whether the rreturn value that judges PciFindDevice () function is OK, and if so, function interface returns to OK; If above-mentioned judgement occurs, if the process of above-mentioned judgement occurs negating to exit function and return to corresponding fault code.

2. cpci bus digital quantity input function unit drives Programming Methodology under a kind of vxworks operating system according to claim 1, is characterized in that, the specific implementation process of described step 1 is:

Step 1 (1) is obtained the facility information of the digital quantity input functional module based on cpci bus:

After PCI device power, BIOS PCI allocation equipment, the BIOS of target machine lists the interrupt number information of the PCI equipment that finds and Vendor ID, Device ID, device type, distribution when starting;

Initialization function first utilizes function pciFindDevice () to find corresponding equipment according to equipment Vendor ID and Device ID, according to Vendor ID, Device ID and identical device serial number, scan bus, find out BUS No, Device No and the Func No at equipment place; Then according to Bus number, device number and function number, call register base address and the interrupt number that pciConfigInLong () and pciConfigInByte () function are determined equipment; Again base address and I/O mask bit phase with obtain internal register base address on real plate;

The mapping of step 1 (2) device memory

The MMU of the standard that user provides with VxWorks distributes the memory headroom of PCI equipment; After clear and definite base address and memory headroom size, call function sysMmuMapAdd () function is configured to MMU by memory headroom; Complete after the device memory mapping of digital quantity input functional module, by the access to device memory, realize the control to equipment;

Step 1 (3) Break Link

In vxworks operating system, use intConnect () link interruption service routine, adopt pciIntConncet () to articulate interruption, pciIntConncet () is defined in pciIntLib.c, during use, comprise header file pciIntLib.h, interrupt vector ventor is by the INUM_TO_IVEC acquisition that converts;

After using pciIntConnect () function that interruption and specific c program are coupled together under VxWorks system, described function is associated the C function of appointment with the interrupt vector of appointment, the address of function will be stored in described interrupt vector, when an interrupt occurs, system will be called described specific c program function, i.e. interrupt service routine.

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