CN108536621A - SSD1306 OLED driving methods and SPI subsystem - Google Patents
SSD1306 OLED driving methods and SPI subsystem Download PDFInfo
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- CN108536621A CN108536621A CN201810306399.4A CN201810306399A CN108536621A CN 108536621 A CN108536621 A CN 108536621A CN 201810306399 A CN201810306399 A CN 201810306399A CN 108536621 A CN108536621 A CN 108536621A
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- spi
- oled
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- info
- driving
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/10—Program control for peripheral devices
- G06F13/102—Program control for peripheral devices where the programme performs an interfacing function, e.g. device driver
Abstract
The present invention discloses SSD1306 OLED driving methods, is related to server technology, and registration first includes the spi_board_info arrays of SPI facility informations；SPI host controllers create spi_device according to SPI facility informations；Then SPI device drives register spi_driver, complete the initialization of SPI equipment；The process that SSD1306 OLED driving is realized includes：1) spi_driver instantiation and registration, 2) probe realize, 3) OLED write data-interface encapsulation, 4) OLED control interfaces encapsulation.The present invention realizes the driving to SSD OLED, in accordance with the design philosophy of host driven and peripheral hardware driving separation, simplifies the realization of device drives, has preferably maintainable, provides and facilitates to greatest extent for the maintenance upgrade of driving.The invention also discloses a kind of SPI subsystems.
Description
Technical field
The present invention relates to server technologies, specifically SSD1306 OLED driving methods and SPI subsystem.
Background technology
The idea of typical Host driving and peripheral hardware driving separation is all utilized in the subsystems such as SPI, IIC, USB in Linux,
Host side is allowed only to be responsible for generating the transmitted waveform in bus, and peripheral hardware end is simply by the API (Application of standard
Programming Interface, application programming interface) allow the host side to access itself with waveform appropriate；Here it relates to
And 4 software modules：
1) driving of host side, according to the Hardware Manual of the controllers such as specific IIC, SPI, USB, operation is specific
The controllers such as IIC, SPI, USB generate the various waveforms of bus；
2) tie of host and peripheral hardware is connected.Peripheral hardware does not directly invoke the driving of host side to generate waveform, but adjusts one
The API of a standard.By the API of this standard, the transmission request of this waveform, " forwarding " drives to specific host side indirectly,
Simultaneously preferably as described in waveform description with certain data structure standard；
3) driving at peripheral hardware end.Peripheral hardware is connected in bus as IIC, SPI, USB, themselves can be touch screen,
The equipment of network interface card, sound card or any one type.It can be in relevant i2c_driver, spi_driver, usb_driver
It goes to register its specific type in probe () function of this xxx_driver.When these peripheral hardwares require IIC, SPI, USB etc.
When going to access it, it calls the standard API of " tie of connection host and peripheral hardware " module；
4) plate grade logic is equivalent to one " routing table " for describing how host and peripheral hardware interconnect.Assuming that plank
On have multiple SPI controllers and multiple SPI peripheral hardwares, the interconnecting relation between them is managed by plate grade logic.This part is usual
It appears in below arch/arm/mach-xxx or below arch/arm/boot/dts.
Good Software for Design need to meet and correct code is allowed to occur in correct position.It should not be in wrong time, mistake
Place accidentally, writes the code of a core dumped.In LKML, code appears in the position of mistake, commonly uses code " out of
Place " is stated.
Linux is by above-mentioned design method, and a pile, disagreeableness code becomes the small moulds of 4 lightweights in a jumble
Block, each module are had a role to play.Host side is only responsible for generating waveform；Which for oneself being connected on host peripheral hardware end require no knowledge about
On controller；Plate grade logic manages the interconnecting relation between multiple controllers and peripheral hardware.Intrusion Detection based on host drives to be driven with peripheral hardware
The design philosophy of separation, the present invention propose the driving design schemes of the SSD1306OLED based on SPI interface, realize
The driving of SSD1306OLED.Here, SPI (Serial Peripheral Interface, Serial Peripheral Interface (SPI)) bus system
It is a kind of synchronous serial Peripheral Interface, it can be such that MCU is communicated in a serial fashion with various peripheral equipments to exchange information.
Invention content
The present invention is directed to the demand and shortcoming of current technology development, provide a kind of SSD1306OLED driving methods and
SPI subsystem.
It is as follows to solve the technical solution that above-mentioned technical problem uses for SSD1306OLED driving methods of the present invention：It is described
SSD1306OLED driving methods realize that step includes：
Step 1, registration include the spi_board_info arrays of SPI facility informations；
In Linux start-up courses, in the init_machine () of machine, pass through spi_register_board_info
Registration includes spi_board_info to the spi_board_info arrays of SPI facility informations；
Step 2, SPI host controllers create spi_device according to SPI facility informations；
When SPI host controllers are registered, the facility information in traversal spi_board_info arrays is removed, finds and mounts under it
The SPI facility informations in face call spi_new_device to create spi_device；
Step 3, SPI device drives register spi_driver, complete the initialization of SPI equipment；
SPI device drives register spi_device when, remove registered spi_device in matching system, if matching at
Work(then calls probe () function in SPI device drives, completes the initialization of practical SPI equipment.
Specifically, the process that the SSD1306OLED drivings are realized includes four aspects：1) spi_driver instantiation and
Registration, 2) probe realize, 3) OLED write data-interface encapsulation, 4) OLED control interfaces encapsulation.
Specifically, 1) the spi_driver instantiations and registration, concrete operations are as follows：
In Linux, one SPI peripheral hardwares driving, the spi_driver structures are described with spi_driver structures
Body includes the example of interface probe (), remove (), suspend (), resume () and device_driver.
Specifically, 2) probe is realized：
Spi_oled_probe functions are called after spi_driver and spi_device are matched, and are used for software and hardware
The initialization of resource；
Concrete operations are as follows：(1) DC pins are obtained and are set to export；(2) overall situation of the application for data transmission
buffer；(3) the interface function collection file_operations towards upper layer is registered；(4) device node is created.
Specifically, 3) OLED writes data-interface encapsulation：
In the driving of SPI peripheral hardwares, carried out data transmission by spi bus using a set of unified interface；The of this socket
One key data structure is the spi_transfer for describing SPI transmission；Primary complete SPI transfer process can include more
A spi_transfer, these spi_transfer are organized by spi_message；Pass through spi_message_init
() initializes spi_message, calls spi_message_add_tail () that spi_transfer is added to spi_
Message queues.
Specifically, 3) OLED writes data-interface encapsulation：
Initiating a spi_message transmission has synchronous and asynchronous two ways, synchronizes under API modes, can block waiting
This message has been processed, and the API used is spi_sync ()；Under asynchronous API modes, spi_message's
Complete fields mount a call back function, and after message has been processed into, the function is called, and the API used at this time is
spi_async()。
Specifically, 4) the OLED control interfaces encapsulation：
Oled_ioctl (), which is supplied to the control on upper layer to operate, to be had：OLED_CMD_INIT、OLED_CMD_CLEAR_ALL、
OLED_CMD_CLEAR_PAGE、OLED_CMD_SET_POS；The OLED_CMD_INIT is for initializing OLED registers, setting
Page address pattern, clear screen, enabled display are set, realization is encapsulated in OLEDInit () function.
Specifically, the SSD1306OLED resolution ratio is 128*64, each pixel indicates that this position is 0 with one
Then the pixel is extinguished, and is 1 and lights；
64 rows of video memory are divided into page 8 by the Page addressing mode address patterns used in code, every page of correspondence 8
Row selects some column address of reselection after certain page, then writes data inside, often write a data column address pointer and add automatically
1, the column address of left end is automatically reset to when column address pointer reaches video memory right end；User resets aobvious in column address pointer
When depositing left end, new page and column address are reset to access the corresponding RAM contents of new page；
Aforesaid operations action is encapsulated in OLEDClear (), OLEDClearPage (), OLEDSetPos (), corresponding
Ioctl orders are OLED_CMD_CLEAR_ALL, OLED_CMD_CLEAR_PAGE, OLED_CMD_SET_POS respectively.
The invention also provides a kind of SPI subsystem, system framework includes：SPI device drives, SPI core layers, SPI
Controller drives；
SPI device drives：
In Linux start-up courses, in the init_machine () of machine, pass through spi_register_board_info
Registration includes spi_board_info to the spi_board_info arrays of SPI facility informations；
SPI controller drives：
When SPI host controllers are registered, the facility information in traversal spi_board_info arrays is removed, finds and is articulated to
SPI facility informations below oneself call spi_new_device to create spi_device；
SPI device drives register spi_driver when, remove registered spi_device in matching system, if matching at
Work(then calls probe () function in SPI device drives, completes the initialization of practical SPI equipment.
Specifically, the SPI kernel layer implementations spi_write (), drives the when of carrying out pure write operation directly to adjust in SPI peripheral hardwares
With spi_write ()；Spi_message_init (), spi_message_add_tail (), spi_ are called in specific implementation
sync()。
SSD1306OLED driving methods and SPI subsystem of the present invention, have the advantage that compared with prior art
It is：The present invention realizes the driving to SSD OLED, in accordance with the design philosophy of host driven and peripheral hardware driving separation, in equipment mould
The realization of device drives is further simplified on the basis of type, and there is preferably maintainability, provided for the maintenance upgrade of driving
To greatest extent facilitate.
Specific implementation mode
The technical issues of to make technical scheme of the present invention, solving and technique effect are more clearly understood, below in conjunction with tool
Body embodiment is checked technical scheme of the present invention, is completely described, it is clear that described embodiment is only this hair
Bright a part of the embodiment, instead of all the embodiments.Based on the embodiment of the present invention, those skilled in the art are not doing
All embodiments obtained under the premise of going out creative work, all within protection scope of the present invention.
Embodiment 1:
The present embodiment proposes that SSD1306OLED driving methods, Intrusion Detection based on host driving and peripheral hardware drive the design philosophy of separation,
Realize the driving of SSD1306OLED；It is main to realize that step includes：
Step 1, registration include the spi_board_info arrays of SPI facility informations；
Specifically, in Linux start-up courses, in the init_machine () of machine, pass through spi_register_
Board_info registers spi_board_info to the spi_board_info arrays for including SPI facility informations.
SSD1306OLED plate grade information：The spi_board_info of SSD1306OLED instantiations is specific as follows：
Wherein, the demand clock of OLED modules is 10000000Hz；SPICLK original states are low level, rising edge sampling
Data, i.e. CPOL=0, CPHA=0, therefore spi mode are set as SPI_MODE_0；OLED is connected on SPI controller 1, i.e., always
Wire size is 1, and chip select pin is connected on GPF1；D/C pins are connected on GPG4, and indicate to transmit on DO pins is data or life
It enables；And modalias is for matching spi_driver.
Step 2, SPI host controllers create spi_device according to SPI facility informations；
Specifically, when SPI host controllers are registered, the facility information in traversal spi_board_info arrays is removed, is found
The SPI facility informations being articulated to below oneself call spi_new_device to create spi_device.
Step 3, SPI device drives register spi_driver, complete the initialization of SPI equipment；
Specifically, when SPI device drives register spi_device, registered spi_device in matching system is removed, if
Successful match then calls probe () function in SPI device drives, completes the initialization of practical SPI equipment.
In addition, the kernel after ARM Linux 3.x is after being changed to device tree, it is no longer necessary in arch/arm/mach-
The plate grade information of SPI is encoded in xxx, but fills in child node under SPI controller node.
The present embodiment also proposed a SPI subsystem, and SPI subsystem frame includes：SPI device drives, SPI cores
Layer, SPI controller driving.
SPI device drives：
In Linux start-up courses, in the init_machine () of machine, pass through spi_register_board_info
Registration includes spi_board_info to the spi_board_info arrays of SPI facility informations；
SPI controller drives：
When SPI host controllers are registered, the facility information in traversal spi_board_info arrays is removed, finds and is articulated to
SPI facility informations below oneself call spi_new_device to create spi_device；
SPI device drives register spi_driver when, remove registered spi_device in matching system, if matching at
Work(then calls probe () function in SPI device drives, completes the initialization of practical SPI equipment.
Embodiment 2：
The SSD1306OLED driving methods that the present embodiment proposes, are on the basis of 1 network interface card clock adapter board device of embodiment
On, the another embodiment of the present invention is provided, the feasibility and practicability of the present embodiment technical solution are further increased.
The process realized is driven SSD1306OLED is described in detail below, main includes four aspects：1)spi_driver
Instantiation and registration, 2) probe realize, 3) OLED write data-interface encapsulation, 4) OLED control interfaces encapsulation.
1) spi_driver instantiations and registration, concrete operations are as follows：
In Linux, one SPI peripheral hardwares driving is described with spi_driver structures, SPI peripheral hardwares driving is considered as
The client of spi_master drives.Spi_driver structures include interface probe (), remove (), suspend (),
The example of resume () and device_driver.Spi_driver is instantiated in OLED drivings as follows：
Wherein, " oled " is used for the matching of device and device_driver, and spi_ is called in entrance function
Register_driver registers the spi_oled_drv instantiated.
2) probe is realized
Spi_oled_probe functions are called after spi_driver and spi_device are matched, and are used for software and hardware
The initialization of resource；Concrete operations are as follows：
(1) DC pins are obtained and are set to export
Spi_oled_dc_pin=(int) spi->dev.platform_data；
s3c2410_gpio_cfgpin(spi_oled_dc_pin,S3C2410_GPIO_OUTPUT)；
s3c2410_gpio_cfgpin(spi->chip_select,S3C2410_GPIO_OUTPUT)；
(2) global buffer of the application for data transmission
Ker_buf=kmalloc (4096, GFP_KERNEL)；
(3) the interface function collection file_operations towards upper layer is registered
Major=register_chrdev (0, " oled ", ＆oled_ops)；
(4) device node is created
Class=class_create (THIS_MODULE, " oled ")；
device_create(class,NULL,MKDEV(major,0),NULL,"oled")；
3) OLED writes data-interface encapsulation；Concrete operations are as follows：
In the driving of SPI peripheral hardwares, carried out data transmission by spi bus using a set of unified interface.The of this socket
One key data structure is spi_transfer, for describing SPI transmission.Once complete SPI transfer process may include
Multiple spi_transfer, these spi_transfer are organized by spi_message.Pass through spi_message_
Init () initializes spi_message, calls spi_message_add_tail () that spi_transfer is added to spi_
Message queues.
Initiating a spi_message transmission has synchronous and asynchronous two ways, synchronizes under API modes, can block waiting
This message has been processed, and the API used is spi_sync ()；Under asynchronous API modes, it will not block and wait for this message quilt
It has been handled that, a call back function, after message has been processed into, the letter can be mounted in the complete fields of spi_message
Number is called, and the API used at this time is spi_async ().
It is as follows that OLED drivings encapsulated writes function：
Wherein, the ker_buf that the data copy that copy_from_user hands down user's space is safeguarded to OLED drivings.
OLED_Set_DC (1) draws high DC pins, and indicate next to transmit is data.Spi_write () is SPI kernel layer implementations
Universal rapid API, SPI peripheral hardwares drive carry out pure write operation when directly invoke, specifically call spi_message_init
()、spi_message_add_tail()、spi_sync()。
4) OLED control interfaces encapsulate, and concrete operations include：
Oled_ioctl (), which is supplied to the control on upper layer to operate, to be had：OLED_CMD_INIT、OLED_CMD_CLEAR_ALL、
OLED_CMD_CLEAR_PAGE、OLED_CMD_SET_POS。
Wherein, OLED_CMD_INIT is used to initialize OLED registers, setting page address pattern, clear screen, enabled display,
Realization is encapsulated in OLEDInit () function；SSD1306OLED resolution ratio is 128*64, and each pixel is indicated with one, this
Position is that 0 this pixel is just extinguished, and is 1 just to light.The Page addressing mode address patterns used in code are video memory
64 rows be divided into page 8, every page of 8 row of correspondence selects some column address of reselection after certain page, then writes data inside, often write
One data column address pointer adds 1 automatically, the row of left end are automatically reset to when column address pointer reaches video memory right end
Location, page address pointer will not automatically plus 1 at this time, and user needs, when column address pointer resets video memory left end, to reset new
Page and column address to access the corresponding RAM contents of new page.Aforesaid operations action be encapsulated in OLEDClear (),
OLEDClearPage (), OLEDSetPos (), corresponding ioctl orders are OLED_CMD_CLEAR_ALL, OLED_ respectively
CMD_CLEAR_PAGE、OLED_CMD_SET_POS。
Oled_ioctl () encapsulation is as follows：
In the present embodiment, while realizing that the initialization to OLED controls operation by test case oled_test.c, and
The operation of data is write to the designated positions OLED.Code snippet is as follows：
Use above specific case elaborates the principle of the present invention and embodiment, these embodiments are
It is used to help understand core of the invention technology contents, the protection domain being not intended to restrict the invention, technical side of the invention
Case is not limited in above-mentioned specific implementation mode.Based on the above-mentioned specific embodiment of the present invention, those skilled in the art
Without departing from the principle of the present invention, any improvement and modification to made by the present invention should all fall into the special of the present invention
Sharp protection domain.
Claims (10)
1.SSD1306OLED driving method, which is characterized in that realize that step includes：
Step 1, registration include the spi_board_info arrays of SPI facility informations；Step 2, SPI host controllers according to
SPI facility informations create spi_device；
In Linux start-up courses, in the init_machine () of machine, registered by spi_register_board_info
Include spi_board_info to the spi_board_info arrays of SPI facility informations；
Step 2, SPI host controllers create spi_device according to SPI facility informations；
When SPI host controllers are registered, the facility information in traversal spi_board_info arrays is removed, finds and mounts below
SPI facility informations call spi_new_device to create spi_device；
Step 3, SPI device drives register spi_driver, complete the initialization of SPI equipment；
When SPI device drives register spi_device, registered spi_device in matching system is removed, if successful match,
Probe () function in SPI device drives is called, the initialization of practical SPI equipment is completed.
2. SSD1306OLED driving methods according to claim 1, which is characterized in that the SSD1306OLED drivings are realized
Process include four aspect：1) spi_driver instantiation and registration, 2) probe realize, 3) OLED write data-interface encapsulation,
4) OLED control interfaces encapsulate.
3. SSD1306OLED driving methods according to claim 2, which is characterized in that 1) the spi_driver instantiations
And registration, concrete operations are as follows：
In Linux, one SPI peripheral hardwares driving, the spi_driver structures packet are described with spi_driver structures
Include the example of interface probe (), remove (), suspend (), resume () and device_driver.
4. SSD1306OLED driving methods according to claim 3, which is characterized in that 2) probe is realized：
Spi_oled_probe functions are called after spi_driver and spi_device are matched, and are used for software and hardware resources
Initialization；
Concrete operations are as follows：(1) DC pins are obtained and are set to export；(2) global buffer of the application for data transmission；
(3) the interface function collection file_operations towards upper layer is registered；(4) device node is created.
5. SSD1306OLED driving methods according to claim 4, which is characterized in that 3) OLED writes data-interface envelope
Dress：
In the driving of SPI peripheral hardwares, carried out data transmission by spi bus using a set of unified interface；First of this socket
Key data structure is the spi_transfer for describing SPI transmission；Primary complete SPI transfer process can include multiple
Spi_transfer, these spi_transfer are organized by spi_message；Pass through spi_message_init ()
Spi_message is initialized, calls spi_message_add_tail () that spi_transfer is added to spi_message
Queue.
6. SSD1306OLED driving methods according to claim 5, which is characterized in that 3) OLED writes data-interface envelope
Dress：
Spi_message transmission of initiation has synchronous and asynchronous two ways, synchronizes under API modes, can block and wait for this
Message has been processed, and the API used is spi_sync ()；Under asynchronous API modes, in the complete fields of spi_message
A call back function is mounted, after message has been processed into, the function is called, and the API used at this time is spi_async ().
7. SSD1306OLED driving methods according to claim 6, which is characterized in that 4) the OLED control interfaces encapsulation：
Oled_ioctl (), which is supplied to the control on upper layer to operate, to be had：OLED_CMD_INIT、OLED_CMD_CLEAR_ALL、OLED_
CMD_CLEAR_PAGE、OLED_CMD_SET_POS；The OLED_CMD_INIT is for initializing OLED registers, setting page
Address pattern, clear screen, enabled display, realization are encapsulated in OLEDInit () function.
8. SSD1306OLED driving methods according to claim 7, which is characterized in that the SSD1306 OLED resolution ratio
For 128*64, each pixel is indicated with one, this position is that 0 pixel is extinguished, and is 1 and lights；
64 rows of video memory are divided into page 8 by the Page addressing mode address patterns used in code, every page of 8 row of correspondence,
Some column address of reselection after certain page is selected, then writes data inside, often writes a data column address pointer automatically plus 1,
The column address of left end is automatically reset to when column address pointer reaches video memory right end；User resets video memory in column address pointer
When left end, new page and column address are reset to access the corresponding RAM contents of new page；
Aforesaid operations action is encapsulated in OLEDClear (), OLEDClearPage (), OLEDSetPos (), corresponding ioctl lives
Order is OLED_CMD_CLEAR_ALL, OLED_CMD_CLEAR_PAGE, OLED_CMD_SET_POS respectively.
9.SPI subsystems, which is characterized in that its system framework includes：SPI device drives, SPI core layers, SPI controller drive
It is dynamic；
SPI device drives：
In Linux start-up courses, in the init_machine () of machine, registered by spi_register_board_info
Include spi_board_info to the spi_board_info arrays of SPI facility informations；
SPI controller drives：
When SPI host controllers are registered, the facility information in traversal spi_board_info arrays is removed, finds and is articulated to oneself
Following SPI facility informations call spi_new_device to create spi_device；
When SPI device drives register spi_driver, registered spi_device in matching system is removed, if successful match,
Probe () function in SPI device drives is called, the initialization of practical SPI equipment is completed.
10. SPI subsystem according to claim 9, which is characterized in that the SPI kernel layer implementations spi_write (),
The driving of SPI peripheral hardwares carries out directly invoking spi_write () when pure write operation；Specific implementation calling spi_message_init (),
spi_message_add_tail()、spi_sync()。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109656844A (en) * | 2018-12-03 | 2019-04-19 | 郑州云海信息技术有限公司 | A kind of AT24xx EEPROM driving method and device |
-
2018
- 2018-04-08 CN CN201810306399.4A patent/CN108536621A/en active Pending
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| 21CNBAO: ""Linux主机驱动与外设驱动分离思想" https://blog.51cto.com/21cnbao/333312", 《51CTO博客》 * |
| 香莲清风: ""SPI_OLED驱动" http://blog.sina.com.cn/s/blog_9ac48e3c0102wvlz.html", 《新浪博客》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109656844A (en) * | 2018-12-03 | 2019-04-19 | 郑州云海信息技术有限公司 | A kind of AT24xx EEPROM driving method and device |
| CN109656844B (en) * | 2018-12-03 | 2022-02-22 | 郑州云海信息技术有限公司 | AT24xx EEPROM driving method and device |
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Application publication date: 20180914 |