CN106326157A - Method and device for receiving variable-length data of serial port - Google Patents
Method and device for receiving variable-length data of serial port Download PDFInfo
- Publication number
- CN106326157A CN106326157A CN201510373142.7A CN201510373142A CN106326157A CN 106326157 A CN106326157 A CN 106326157A CN 201510373142 A CN201510373142 A CN 201510373142A CN 106326157 A CN106326157 A CN 106326157A
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- data
- initial value
- dma
- serial ports
- count value
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Classifications
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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
- G06F13/14—Handling requests for interconnection or transfer
- G06F13/20—Handling requests for interconnection or transfer for access to input/output bus
- G06F13/28—Handling requests for interconnection or transfer for access to input/output bus using burst mode transfer, e.g. direct memory access DMA, cycle steal
-
- 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
- G06F13/38—Information transfer, e.g. on bus
- G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
- G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F2213/0002—Serial port, e.g. RS232C
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F2213/28—DMA
- G06F2213/2806—Space or buffer allocation for DMA transfers
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- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Communication Control (AREA)
Abstract
The invention relates to a method and a device for receiving the variable-length data of a serial port. The method comprises the following steps of: setting an initial value, wherein the initial value is DMA (Direct Memory Access) pre-receiving data length; inquiring a count value for one time at an interval of the same preset time period, wherein the count value is the data length obtained in a way that the initial value is taken as a starting value and the initial value reduces one byte one by one when every piece of byte data is received; comparing the count values inquired for successive two times; and if the count values inquired for successive two times are equal and are different from the initial value, determining that data finishes being received. By use of the method, a DMA way is adopted for receiving, the data of any length can be received, CPU (Central Processing Unit) resources are greatly saved, and communication response speed and communication reliability are improved.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of for direct memory access (DMA,
Direct Memory Access) data receiver method.
Background technology
In serial communication, when required communication rate is higher, carry out data receiver, meeting according to interrupt mode
Cause system to frequently enter serial ports transmitting-receiving to interrupt, perform serial ports interrupt service routine, take the most in a large number
CPU processes the time, and easily causes the loss of data, and DMA (Direct Memory Access),
It is a kind of direct from the data exchange mode of memory access data without CPU.In dma mode,
CPU directly controls dma controller by instruction, allows dma controller to process the transmission of data, counts
Again information is fed back to CPU according to transmission is complete, the most largely alleviates cpu resource occupation rate,
System resource can be greatly saved, therefore, during carrying out data receiver, compared with interrupt mode, tool
Have the advantage that first, when using serial ports interrupt mode, often receive 1 byte data and will produce once
Serial ports receives and interrupts, and performs once to receive interrupt service routine, and under dma mode, it is desirable to the number of transmission
All transmit end just generation once to interrupt according to block, decrease CPU and carry out the number of times of interrupt processing；Secondly,
The data transmission using serial ports interrupt mode has been controlled by CPU when interrupt processing, and DMA
It is to have been controlled by dma controller, this eliminates CPU and too much have little time because of LPT device to process
And cause the phenomenons such as loss of data because speed is not mated.But, use dma mode to carry out data and connect
In the time receiving, also there will be some problems, during DMA data transfer operation, indefinite transfer, i.e. sender will send
Data case sender and the regular length appointed of recipient split, it is invalid that not enough regular length is filled with
Data, to regular length, when using dma mode to carry out data receiver, need first to dma controller system
Surely need to receive byte number, and when reality is applied, the byte number of communications reception data at random may be used often
Become, it is impossible to determine, therefore cannot directly use DMA to carry out data receiver, how to utilize DMA side
Formula receives random length data becomes problem demanding prompt solution.
Summary of the invention
The purpose of the present invention is contemplated to solve DMA in prior art cannot receive random length data
Technical problem, the present invention is provided a kind of conveying length being inquired about DMA by timing, and then judges that data connect
Receive and whether complete.The concrete technical scheme of the present invention is as follows:
A kind of method receiving serial ports random length data, described method comprises the steps:
Arranging initial value, described initial value is DMA pre-receiving data length；
At interval of an identical count value of preset time period inquiry；Described count value is: with described initial value be
Initial value, often receives a byte data, and described initial value successively decreases the data length after a byte one by one；
The relatively size of the count value of double inquiry；
If the count value of double inquiry is equal, and with initial value, it is determined that data receiver completes.
Further, described initial value is set after, described method also includes:
The reception mark that trigger source is corresponding serial ports of DMA is set；
After receiving a data word, the reception mark set of described serial ports, triggers DMA transfer.
Further, after described judgement data receiver completes, described method includes:
Calculating the data length that DMA receives, the data length that described DMA receives is described initial value and end
The difference of value, the count value of this inquiry is identical with the count value that last time inquires about, then the count value of this inquiry
It is worth for end.
Further, described initial value is set before, described method also includes:
The reception cache register that source address is corresponding serial ports of DMA is set；
The destination address arranging DMA is data receiver buffer area first address.
Further, after described triggering DMA transfer, described method also includes:
The source address of described DMA keeps constant, and the destination address of described DMA adds 1 automatically；
The data received receive cache register from described serial ports and transfer to described data receiver buffer area.
Further, after described triggering DMA transfer, described method also includes:
Closedown serial ports interrupts, and opens DMA and interrupts.
Further, described method includes:
Described initial value is identical with the size of data receiver buffer area.
Further, described method also includes:
Described preset time period is more than the time received needed for 1 byte data.
A kind of device receiving serial ports random length data, including:
First module, is used for arranging initial value, and described initial value is DMA pre-receiving data length；
Counting unit, for recording gauge numerical value, described count value is for often to receive a byte data, with institute
Stating initial value is initial value, the data length after 1 byte of successively decreasing one by one；
Query unit, at interval of an identical count value of preset time period inquiry；
Comparing unit, for the size of the relatively count value of double inquiry；
Determine unit, be used for determining whether data receiver completes, if the count value of double inquiry is equal,
And with initial value, it is determined that data receiver completes.
Compared to prior art, the present invention provides the most useful of a kind of method receiving serial ports random length data
Effect is: of the present invention for serial communication, when serial communication baud rate is higher, uses DMA
Mode receives data, sets the initial value of DMA pre-receiving data length, often receives the data of a byte,
Described initial value is that initial value successively decreases 1 one by one, at interval of the count value of preset time period inquiry DMA, if
The count value of double inquiry is identical, and different from described initial value, determines that described DMA data receives
Complete, invention achieves and can receive random length data by DMA, be greatly saved cpu resource,
Improve communication corresponding speed and communication reliability.
Accompanying drawing explanation
Fig. 1 is the method step flow chart that the embodiment of the present invention 1 one kinds receives serial ports random length data.
Fig. 2 is the method step flow chart that the embodiment of the present invention 2 one kinds receives serial ports random length data.
Fig. 3 is the device frame structure schematic diagram that the embodiment of the present invention 3 one kinds receives serial ports random length data.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and reality
Execute example, the present invention is further elaborated.Only should be appreciated that specific embodiment described herein
In order to explain the present invention, it is not used to limit the present invention.
Embodiment 1
Refer to shown in Fig. 1.
The present invention provides a kind of method receiving serial ports random length data, and described method comprises the steps:
Sa: arrange initial value, described initial value is DMA pre-receiving data length；DMA pre-receiving number is set
Identical with data receiver buffer size according to length, it should be noted that for ensureing greatest length Frame
Normally receive, receive data buffer area size and have to be larger than the length value equal to greatest length Frame, by institute
State initial value and be set to identical with the size of data receiver buffer area, can reach to reduce loss of data as far as possible
Advantageous Effects.
Sb: at interval of an identical count value of preset time period inquiry；Described count value is: at the beginning of described
Value for initial value, often receives a byte data, and described initial value data after a byte of successively decreasing one by one are long
Degree.
Described preset time period is more than the time received needed for 1 byte data.
It is understood that described initial value is m, clocking value is k, and the time is t；
t0In the moment, the initial value of DMA is m；
t1Moment, k1=m-1；
t2Moment, k2=k1-1；
t3Moment, k3=k2-1；Wherein, t0, t1, t2…tnBetween interlude section identical.
The like, if tnMoment, kn=kn-1-1。
Sc: the relatively size of the count value of double inquiry；Relatively kn-1And knSize.
Sd: determine whether data receiver completes.
Sd1: if the count value of double inquiry is equal, and with initial value, it is determined that data receiver
Complete.
Sd2: if the count value of double inquiry is unequal, then return step Sc.
The count value of this inquiry is kn, the count value of last inquiry is kn-1If, kn=kn-1, and kn
With kn-1All unequal with initial value m, it is determined that data receiver completes.
Embodiment 2
Refer to shown in Fig. 2.
The present invention provides a kind of present invention to provide a kind of method receiving serial ports random length data, described method bag
Include following steps:
Sa: the reception cache register that the source address of DMA is corresponding serial ports is set, such as,
UCAxRXBUF, the destination address arranging DMA is data receiver buffer area first address.
Sb: arrange initial value, described initial value is DMA pre-receiving data length；DMA pre-receiving number is set
Identical with data receiver buffer size according to length, it should be noted that for ensureing greatest length Frame
Normally receive, receive buffer size and have to be larger than the length value equal to greatest length Frame, initial value is set
It is set to identical with the size of data receiver buffer area, can reach to reduce as far as possible the Advantageous of loss of data
Effect.
Sc: the reception mark that trigger source is corresponding serial ports of DMA, such as, UCAxRXIFG are set,
Triggering mode selects rising edge to trigger.
After receiving a data word, the reception mark set of described serial ports, triggers DMA transfer, and connects
The data received receive cache register from described serial ports and transfer to described data receiver buffer area.
In data transmission procedure, the source address of described DMA keeps constant, the destination address of described DMA
Automatically add 1；
Sd: close serial ports and interrupt, opens DMA and interrupts.If receive longer abnormal data frame, enter
Enter DMA to interrupt, for abnormal fault-tolerant processing, entering DMA interrupt processing.
Se: at interval of an identical count value of preset time period inquiry；Described count value is: at the beginning of described
Value for initial value, often receives a byte data, and described initial value data after a byte of successively decreasing one by one are long
Degree.
Described preset time period is more than the time received needed for 1 byte data.
It is understood that described initial value is m, clocking value is k, and the time is t；
t0In the moment, the initial value of DMA is m；
t1Moment, k1=m-1；
t2Moment, k2=k1-1；
t3Moment, k3=k2-1；
The like, if tnMoment, kn=kn-1-1。
Sf: the relatively size of the count value of double inquiry；Relatively kn-1And knSize.
Sg: determine whether data receiver completes.
Sg1: if the count value of double inquiry is equal, and with initial value, it is determined that data receiver is complete
Become.The count value of this inquiry is kn, the count value of last inquiry is kn-1If, kn=kn-1, and kn
With kn-1All unequal with initial value m, it is determined that data receiver completes.
Sg2: if the count value of double inquiry is unequal, then return step Sf.
It should be noted that in prior art, it is identical that DMA receives data length, DMA interrupts only existing
Just can produce DMA when the transmission number of DMA is decremented to 0 to interrupt, corresponding reception length is data
Receive buffer size.Data length owing to receiving every time is indefinite, so DMA can not be utilized to interrupt coming
Judgement finishes receiving.In the application, by the size of timing query counts value, if the meter of double inquiry
Numerical value is identical, is determined as finishing receiving, and has reached to be received the Advantageous of random length data by DMA
Effect.
Sh: data process, and calculate the data length that DMA receives, the data length that described DMA receives
For the difference of described initial value with end value, the count value of this inquiry is identical with the count value that last time inquires about, then originally
The count value of secondary inquiry is end value.
Data length=m-k that DMA receivesn。
Reset destination address and the transmission data length of DMA, again make DMA carry out next frame number
According to reception.
Embodiment 3
Refer to shown in Fig. 3.
On the basis of embodiment 2, the present invention provides a kind of device receiving serial ports random length data, including:
First module, is used for arranging initial value, and described initial value is DMA pre-receiving data length.
Second unit, for arranging source address and the destination address of DMA.
Unit the 3rd, for arranging the trigger source of DMA.
Receive unit, be used for receiving data, often receive a byte data, by described data from source address
Transfer to destination address.
Counting unit, for recording gauge numerical value, described reception unit often receives a byte data, described counting
Value is the data length with described initial value as initial value, after 1 byte of successively decreasing one by one.
Clock unit, is used for providing temporal information.
Query unit, for the temporal information provided according to clock unit, at interval of identical preset time period
Inquire about a count value.
Comparing unit, for the size of the relatively count value of double inquiry.
Determine unit, be used for determining whether data receiver completes, if the count value of double inquiry is equal,
And with initial value, it is determined that data receiver completes.
It should be noted that above example only in order to technical scheme to be described and unrestricted, although ginseng
According to preferred embodiment, the present invention is described in detail, it will be understood by those within the art that, can
Technical scheme is modified or equivalent, without deviating from the essence of technical solution of the present invention
God and scope, it all should be contained in the middle of scope of the presently claimed invention.
Claims (9)
1. the method receiving serial ports random length data, it is characterised in that described method comprises the steps:
Arranging initial value, described initial value is DMA pre-receiving data length；
At interval of an identical count value of preset time period inquiry；Described count value is: with described initial value be
Initial value, often receives a byte data, and described initial value successively decreases the data length after a byte one by one；
The relatively size of the count value of double inquiry；
If the count value of double inquiry is equal, and with initial value, it is determined that data receiver completes.
2. the method receiving serial ports random length data, it is characterised in that described initial value is set after, institute
Method of stating also includes:
The reception mark that trigger source is corresponding serial ports of DMA is set；
After receiving a data word, the reception mark set of described serial ports, triggers DMA transfer.
A kind of method receiving serial ports random length data the most according to claim 1, it is characterised in that
After described judgement data receiver completes, described method includes:
Calculating the data length that DMA receives, the data length that described DMA receives is described initial value and end
The difference of value, the count value of this inquiry is identical with the count value that last time inquires about, then the count value of this inquiry
It is worth for end.
A kind of method receiving serial ports random length data the most according to claim 1, it is characterised in that
Described initial value is set before, described method also includes:
The reception cache register that source address is corresponding serial ports of DMA is set；
The destination address arranging DMA is data receiver buffer area first address.
A kind of method receiving serial ports random length data the most according to claim 4, it is characterised in that
After described triggering DMA transfer, described method also includes:
The source address of described DMA keeps constant, and the destination address of described DMA adds 1 automatically；
The data received receive cache register from described serial ports and transfer to described data receiver buffer area.
A kind of method receiving serial ports random length data the most according to claim 2, it is characterised in that
After described triggering DMA transfer, described method also includes:
Closedown serial ports interrupts, and opens DMA and interrupts.
A kind of method receiving serial ports random length data the most according to claim 5, it is characterised in that
Described method includes:
Described initial value is identical with the size of data receiver buffer area.
A kind of method receiving serial ports random length data the most according to claim 1, it is characterised in that
Described method also includes:
Described preset time period is more than the time received needed for 1 byte data.
9. the device receiving serial ports random length data, it is characterised in that including:
First module, is used for arranging initial value, and described initial value is DMA pre-receiving data length；
Counting unit, for recording gauge numerical value, described count value is for often to receive a byte data, with institute
Stating initial value is initial value, the data length after 1 byte of successively decreasing one by one；
Query unit, at interval of an identical count value of preset time period inquiry；
Comparing unit, for the size of the relatively count value of double inquiry；
Determine unit, be used for determining whether data receiver completes, if the count value of double inquiry is equal,
And with initial value, it is determined that data receiver completes.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510373142.7A CN106326157A (en) | 2015-06-30 | 2015-06-30 | Method and device for receiving variable-length data of serial port |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510373142.7A CN106326157A (en) | 2015-06-30 | 2015-06-30 | Method and device for receiving variable-length data of serial port |
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| CN201510373142.7A Pending CN106326157A (en) | 2015-06-30 | 2015-06-30 | Method and device for receiving variable-length data of serial port |
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Cited By (5)
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| CN107423654A (en) * | 2017-08-11 | 2017-12-01 | 四川长虹电器股份有限公司 | A kind of method for receiving random length bar code |
| CN108304335A (en) * | 2018-02-07 | 2018-07-20 | 南京南瑞继保电气有限公司 | A method of the indefinite long message of serial ports is received by DMA |
| CN111026694A (en) * | 2019-11-01 | 2020-04-17 | 珠海奔图电子有限公司 | Data receiving method, data receiving apparatus, image forming system, and electronic apparatus |
| CN112256617A (en) * | 2020-10-23 | 2021-01-22 | 福州富昌维控电子科技有限公司 | Method and terminal for improving serial port communication efficiency of equipment |
| CN114741343A (en) * | 2022-02-28 | 2022-07-12 | 惠州华阳通用电子有限公司 | Controller port expansion device and method |
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| CN111026694B (en) * | 2019-11-01 | 2021-03-02 | 珠海奔图电子有限公司 | Data receiving method, data receiving apparatus, image forming system, and electronic apparatus |
| CN112256617A (en) * | 2020-10-23 | 2021-01-22 | 福州富昌维控电子科技有限公司 | Method and terminal for improving serial port communication efficiency of equipment |
| CN112256617B (en) * | 2020-10-23 | 2021-04-20 | 福州富昌维控电子科技有限公司 | Method and terminal for improving serial port communication efficiency of equipment |
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Application publication date: 20170111 |