CN103984568A - PCI (Peripheral Component Interconnection)-to-CF (Compact Flash) driving method - Google Patents

Abstract

The invention provides a PCI (Peripheral Component Interconnection)-to-CF (Compact Flash) driving method. The specific realization process of the PCI-to-CF driving method comprises the steps of creating a CF driver in a ReWorks operating system; initializing CF device and creating a device file system; after a device driver is established, using I/O (Input/Output) functions to access the CF device; packing the driver in the ReWorks operating system, compiling the kernel of the system and programming the driver on a handheld computer platform; after the system is started, inserting the CF device into a slot, wherein the system automatically recognizes the CF device, the CF device is configured after recognition and the CF device completes storage backup; pulling out the CF device, wherein the system automatically uninstalls the CF device. Compared with the prior art, the PCI-to-CF driving method has the advantages that the CF extension function is realized, the practicability is high, the application scope is wide and the popularization is facilitated.

Description

A kind of PCI turns CF driving method

Technical field

The present invention relates to field of computer technology, specifically a kind of PCI turns CF driving method.

Background technology

The universal cpu of institute's independent research calculates in the Godson series processors Shi Shi Chinese Academy of Sciences, and wherein Godson 1 series processors is towards Embedded Application such as Industry Control, consumer electronics (mobile phone/MP4/ palm PC etc.).Godson 1A processor itself is not supported CF expansion, but many special trade users have the expansion equipment of a lot of CF interfaces as military user etc.CF card can be operated in three kinds of patterns: PC Card Memory pattern, PC Card I/O pattern and True IDE pattern.True IDE pattern using is less, and PC Card Memory pattern can be supported CF interface memory card, but the CF interfacing equipment of military user is mostly PC Card I/O pattern at present, and the CF interface of this pattern can only produce by pci bus.And Godson 1A supports pci bus expansion, therefore we adopt the pci bus of Godson 1A to expand a standard C F interface, have both supported Compact Flash, also support other equipment of CF interface.

ReWorks embedded OS is the embedded real-time operating system that the 32nd, the China Electronics science and technology group technological achievement based on " 95 ", " 15 " is developed voluntarily, is applicable to plurality of target hardware environment (x86, mips).ReWorks operating system adopts object-oriented and Microkernel exploitation, has hard real-time, Scalability and scalability, and VxWorks compatible layer is provided.

Still PCI under domestic embedded OS ReWorks is not turned to the research that CF drives at present, therefore, now provide a kind of based on having realized the driving method that PCI is turned to CF interface under domestic embedded OS ReWorks.

Summary of the invention

Technical assignment of the present invention is in the deficiencies in the prior art, provides a kind of PCI to turn CF driving method.

Technical scheme of the present invention realizes in the following manner, and this one PCI turns CF driving method, and its specific implementation process is:

One, in ReWorks operating system, create CF and drive: initialization CF equipment, creates installable file system;

Two, after apparatus for establishing driver, use I/O function access CF equipment, this I/O function comprises: create (), open (), read (), write () and remove () function;

Three, driver is packed into ReWorks operating system, compiling system kernel, programming is to Godson 1A handheld computer platform;

Four, after startup system, CF equipment is inserted to slot, system is identified CF equipment automatically, after identification, CF equipment is configured, and CF equipment completes storage backup;

Five, CF equipment is extracted to system Self-tipping CF equipment.

In described step 3, drive the process of identification CF equipment to be automatically: ReWorks identifies PCI equipment by the classification of PCI equipment, the classification of PCI equipment comprises PCI class, PCI subclass and PCI agreement, the ReWorks constant PCID_NOTIFY_ALL that gives a definition, this constant represents above-mentioned all PCI classes, PCI subclass and PCI agreement, identifies the plug of all PCI kind equipments by programming.

In described step 3, the layoutprocedure of CF equipment is: first, drive the GPIO that transmission CF signal is set in system, and for it distributes the IO port that addressing is used, under PC card I/O pattern, the IO port of CF equipment is the 16 byte data pieces in its common store space; Secondly, property store space to CF equipment is configured, this configuration refers to be verified the value of CF device attribute option register, configuration status register, pin replacement register, socket copy register, if these values are not mated with default value, its value will be used as default.

In described step 3, the storage backup process of CF equipment is:

System is issued ATA instruction to CF equipment, and this ATA command request CF equipment could be processed the data stream in CF buffer zone in busy condition not and while having request of data in the time receiving order;

Driver obtains the piece number of CF equipment according to the I/O request of system, utilize this piece number to calculate the LBA address of CF equipment;

Then get the low 28 of block, the low bit register of the cylinder of corresponding CF equipment, the high bit register of cylinder, sector register, equipment/head register successively, these parameter values and ATA instruction are write in corresponding registers by 8 modes, complete storing process one time.

The beneficial effect that the present invention compared with prior art produced is:

A kind of PCI of the present invention turns CF driving method to be realized based on domestic operating system, has realized CF expanded function, practical, applied widely, is easy to promote.

Brief description of the drawings

Accompanying drawing 1 is hardware configuration schematic diagram of the present invention.

Embodiment

Below in conjunction with accompanying drawing, a kind of PCI provided by the present invention being turned to CF driving method is described in detail below.

As shown in Figure 1, the invention provides a kind of PCI and turn CF driving method, first configurator hardware device, hardware entirety adopts structure as shown in Figure 1, hardware in this accompanying drawing is basic identical with prior art hardware, but its CPU adopts domestic Godson CPU, it is the sharp China in accompanying drawing at ReWorks(that software systems are used domestic) operating system.

After hardware setting completes, its concrete PCI turns CF and drives implementation procedure to be:

One,, in ReWorks operating system, create CF and drive: initialization CF equipment, create installable file system, the key source code of this establishment is:

If(pciDrv(PCI_INT_VEC,IDE_INT_VEC,type)==ERROR)

printf(“Could?not?initialize.\n”);

dosFsInit(NUM_DOSFS_FILES);

if(usrIdeConfig(drive,fileName)==ERROR)

……

Two, after apparatus for establishing driver, use I/O function access CF equipment, this I/O function comprises: create (), open (), read (), write () and remove () function;

Three, driver is packed into ReWorks operating system, compiling system kernel, programming is to Godson 1A handheld computer platform;

Four, after startup system, CF equipment is inserted to slot, system is identified CF equipment automatically, after identification, CF equipment is configured, and CF equipment completes storage backup;

Five, CF card is extracted to system Self-tipping CF equipment.

In described step 3, drive the process of identification CF equipment to be automatically: ReWorks identifies PCI equipment by the classification of PCI equipment, the classification of PCI equipment is from PCI class, PCI subclass and the definition of PCI agreement three aspects:, but in reality because device class is many, not all equipment can be easy to find its device class, the method of a more convenient identification PCI equipment is provided under ReWorks, the ReWorks constant PCID_NOTIFY_ALL that gives a definition, this constant can represent all PCI classes, PCI subclass and PCI agreement, can identify the plug of all PCI kind equipments.Survey (probe) function code as follows:

static?int?pci_bus_probe(struct?device?*dev)

{

struct?pci_driver?*drv?=?to_pci_driver(dev->driver);

struct?pci_card?*card?=?dev_to_pci_card(dev);

return?drv->probe(card);

}

In described step 3, the layoutprocedure of CF equipment is: before CF card is carried out to storage operation, driver will carry out necessary configuration to it.First, drive the GPIO that transmission CF signal is set in system, and distribute for it IO port that addressing is used.Under PC Card I/O pattern, the IO port of CF card is the 16 byte data pieces in its common store space.Secondly, the property store space of CF card is configured.For guaranteeing correct use CF card, driving need to be verified the value of its attributes section register, configuration status register, pin replacement register, socket copy register, if these values are not mated with default value, its value will be used as default.

In described step 3, the storage backup process of CF equipment is:

Realize the storage backup function of CF, require CF card correctly to receive and the I/O request of responding system to it, system and then issue ATA instruction to CF.ATA instruction set is divided into 3 classes, and every class order all requires CF to be stuck in while receiving order could process the data stream in CF/ buffer zone in the time not being in a hurry (BSY=0) state and having request of data (DRQ=1).Driver obtains the piece number of CF card according to the I/O request of system, utilize this piece number to calculate the LBA address of CF card.Get the low 28 of block, the low bit register of the cylinder of corresponding CF card, the high bit register of cylinder, sector register, equipment/head register successively, writes these parameter values and ATA instruction in corresponding registers by 8 modes, completes storing process one time.

In addition, a large characteristic of the embedded memory device such as CF card can be accomplished plug and play exactly.In ReWorks system, system layer and application layer all will be processed hot plug event.In system layer, to survey on the one hand the hot plug event of CF card, distribute or free system resources, and drive CF equipment; On the other hand, be by the hot plug event of storage card notice application layer promptly and accurately.Application layer is made corresponding processing according to hot plug event.

Except the technical characterictic described in instructions, be the known technology of those skilled in the art.

Claims (4)

1. PCI turns a CF driving method, it is characterized in that: its specific implementation process is:

One, in ReWorks operating system, create CF and drive: initialization CF equipment, creates installable file system;

Two, after apparatus for establishing driver, use I/O function access CF equipment, this I/O function comprises: create (), open (), read (), write () and remove () function;

Three, driver is packed into ReWorks operating system, compiling system kernel, programming is to Godson 1A handheld computer platform;

Four, after startup system, CF equipment is inserted to slot, system is identified CF equipment automatically, after identification, CF equipment is configured, and CF equipment completes storage backup;

Five, CF equipment is extracted to system Self-tipping CF equipment.

2. a kind of PCI according to claim 1 turns CF driving method, it is characterized in that: in described step 3, drive the process of identification CF equipment to be automatically: ReWorks identifies PCI equipment by the classification of PCI equipment, the classification of PCI equipment comprises PCI class, PCI subclass and PCI agreement, the ReWorks constant PCID_NOTIFY_ALL that gives a definition, this constant represents above-mentioned all PCI classes, PCI subclass and PCI agreement, identifies the plug of all PCI kind equipments by programming.

3. a kind of PCI according to claim 1 turns CF driving method, it is characterized in that: in described step 3, the layoutprocedure of CF equipment is: first, drive the GPIO that transmission CF signal is set in system, and distribute for it IO port that addressing is used, under PC card I/O pattern, the IO port of CF equipment is the 16 byte data pieces in its common store space; Secondly, property store space to CF equipment is configured, this configuration refers to be verified the value of CF device attribute option register, configuration status register, pin replacement register, socket copy register, if these values are not mated with default value, its value will be used as default.

4. a kind of PCI according to claim 1 turns CF driving method, it is characterized in that: in described step 3, the storage backup process of CF equipment is:

System is issued ATA instruction to CF equipment, and this ATA command request CF equipment could be processed the data stream in CF buffer zone in busy condition not and while having request of data in the time receiving order;

Driver obtains the piece number of CF equipment according to the I/O request of system, utilize this piece number to calculate the LBA address of CF equipment;

Then get the low 28 of block, the low bit register of the cylinder of corresponding CF equipment, the high bit register of cylinder, sector register, equipment/head register successively, these parameter values and ATA instruction are write in corresponding registers by 8 modes, complete storing process one time.