CN1996275A - Bulk memory accessing method for I2C controller in 10-site addressing mode - Google Patents
Bulk memory accessing method for I2C controller in 10-site addressing mode Download PDFInfo
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Abstract
The accessing to the large capacity storage device of the I2C controller using 10 digit addressing mode, starts with the I2C controller sending out a start signal, sending out writing instruction, waiting for the return of ACK, sending out the higher 8 digits of the said data addressing, waiting for return of ACK, sending out low 8 digits of the data addressing, waiting for ACK return, sending out a start signal, reading a digit of the said data and waiting for ACK. If the read data is of one digit, go directly to next step, otherwise, repeat the step till the reading of all the data with certain length till the stop of the instruction sending. It can easily realize standard I2C controller accessing of I2C storage media with larger space in a simple and highly efficient way.
Description
Technical field
The present invention relates to the communication field of telecommunication equipment, electronic equipment and computer equipment, relate in particular to the method for utilizing I2C controller access mass storage.
Background technology
At present, in fields such as numerical control consumer appliances, telecommunication equipment, electronic equipment and computer equipment, utilize I2C bus and other equipment to come mutual communication between the realization equipment widely.
I2C (Inter-Integrated Circuit) bus is a kind of two-wire serial bus, is made of bidirectional data line SDA and clock line SCL, by these two lines, communication mutually between system's components and parts.The I2C bus is divided from transfer rate, and mode standard (100Kbit/s) is arranged, quick mode (400Kbit/s), fast mode (3.4Mbit/s); From the addressing range division 7 bit address patterns and 10 bit address patterns are arranged.The I2C bus connects I2C master controller (bus master) and I2C utility appliance (bus slave), in general, the I2C master controller is microprocessor normally, and the I2C utility appliance comprises the equipment on the many I2C of being connected buses, waits for such as storer, sensor.Usually, the I2C master controller can and provide clock signal with the direct communication of I2C utility appliance; The I2C utility appliance can receive data or provide data for master controller from the I2C master controller.Can only there be an I2C master controller to exist at any time, but can has a plurality of I2C utility appliance to exist simultaneously.
Data can only be transmitted on the I2C bus with byte mode, and data transmission unit is a byte.Transmission is normally with most important position (most significant bit, hereinafter to be referred as MSB) as first, the back is immediately following 8 bit data, after each byte end of transmission (EOT), the capital spreads out of a response bit (Acknowledge bit is hereinafter to be referred as ACK) from the other side.Fig. 1 represents the form of data transmission on the I2C bus.
When the I2C master controller sends an order to the I2C utility appliance, software need be done following setting: utility appliance address (Slave Address), operational attribute be set be read or write, command word (Command Code), data (Data), then control register is opened (start).If all parameters are all correct, then when write operation was finished the transmission of data, when perhaps the reception of data was finished in read operation, the I2C master controller will produce a SMI# signal or produce and interrupt.
The I2C bus is supported 7 kinds of modes of operation: order (Quick Command) fast, send byte, receive byte, write byte, read byte, the read/write of the invocation of procedure and data block.Bottom has listed wherein the most frequently used several modes of operation:
1) from a byte of current read address (Byte)/word (Word):
The memory inside that belongs to the I2C utility appliance has an address pointer counter to be used to write down the pointer of current reference address, and after the memory read/write operations, this pointer will move and preserve automatically each time.Receive byte and just can realize obtaining simply the data that current pointer indication address bit is deposited.This operate on the bidirectional data line SDA data stream as shown in Figure 2.Storer reads a data block operations from the current address, the operation of just reading a word is for reading a byte manipulation, its difference does not send the STOP order after being to transmit the data of a byte, but continue to read the data of next byte, up to having read all data, send the STOP order again, manipulation of data stream as shown in Figure 6.
2) write a byte to the current address:
It is very similar to the agreement of reading a byte to write a byte, and unique difference is exactly the direction of transfer of data: the data of reading a byte are to pass to the I2C master controller from the I2C utility appliance; And the data of writing a byte are to pass to the I2C utility appliance from the I2C master controller.This data stream that operates on the bidirectional data line SDA is similar to Fig. 2, and just the 8th with first byte of Fig. 2 changes " 0 " into.
3) write a byte/word to the assigned address of storer:
The address that this command format requirement at first transmits an I2C utility appliance, and command word last the position indicate it is a write operation, wait for the response of I2C utility appliance, the value of that byte that transmits the data address that length is a byte (Word Address) then and will write, back send a STOP order again.This operate on the bidirectional data line SDA data stream as shown in Figure 3.The operation that writes a word (buffer writes) is for writing a byte (byte is write) operation, its difference does not send the STOP order after being to transmit the data of a byte, but continue to write the data of next byte, up to having write all data, send the STOP order again, manipulation of data stream as shown in Figure 4.
4) read a byte/word from the assigned address of storer:
Read operation and write operation are not quite alike, read an assigned address, must earlier tell the address that storer will read with write order, and then carry out read operation, send the STOP order again after receiving byte, and the data stream of operation as shown in Figure 5.If want to read from assigned address the data of a word, the operation before the STOP order is all constant, just after receiving first byte, does not send the STOP order, but reads a byte again, up to receiving all data, just sends the STOP order.
At present, adopt the I2C bus of 10 bit addressing patterns to provide 10 bit address lines, can only visit the physical space of 1K byte at most for utility appliance.Increase along with the application of I2C bus, space to storer has also proposed bigger requirement, a lot of storage spaces have been arranged at present on the market greater than 1K bytes of memory device, and, therefore can not normally finish the random access of data with normal I2C bus operation flow process because the address bit of its data has surpassed 10.
Summary of the invention
In view of above-mentioned, the present invention to solve the I2C controller that adopts 10 bit addressing patterns because of addressing space not enough can't the addressable storage space greater than the technical matters of 1K bytes of memory equipment, to improve the storage space of system, for system provides more strong functions.
In order to solve the problems of the technologies described above, the present invention proposes a kind of method of I2C controller access mass storage of employing 10 bit addressing patterns, wherein above-mentioned I2C controller from mass storage at random the operation of reading of data may further comprise the steps at least:
Step 1, the I2C controller sends a beginning (start) signal;
Step 2, the I2C controller sends the write operation order to mass storage, and waits for its passback ACK;
Step 3, receive ACK after, the I2C controller sends the most-significant byte of the address of above-mentioned data to mass storage, and wait for its passback ACK;
Step 4, receive ACK after, the I2C controller sends the least-significant byte of the address of above-mentioned data to mass storage, and wait for its passback ACK;
Step 5, receive ACK after, the I2C controller sends a start signal again;
Step 6, the I2C controller sends the read operation order to mass storage, and waits for its passback ACK;
Step 7, receive ACK after, the I2C controller reads a byte of above-mentioned data from mass storage, and wait for its passback ACK;
Step 7 ', if the size of data that reads is a byte, then directly forward step 8 to; If the data that read are greater than a byte, repeating step 7 all reads up to the data of designated length and to finish, and forwards step 8 to;
Step 8, receive ACK after, send and to stop (stop) order.
Wherein, the write operation order in the step 2 is a byte, and its 1-7 position is used to determine operate specifically selected slave controller, the address of above-mentioned mass storage just, and its 8th is 0, expression is used to determine that current operation is a write operation; Read operation order in the step 6 is a byte, and its 1-7 position is used to determine operate specifically selected slave controller, the address of above-mentioned mass storage just, and its 8th is 1, expression is used to determine that current operation is read operation.
The operation of reading of data may further comprise the steps at least to adopt the I2C controller of 10 bit addressing patterns to write at random to mass storage:
Step 1, the I2C controller sends a start signal;
Step 2, the I2C controller sends the write operation order to mass storage, and waits for its passback ACK;
Step 3, receive ACK after, the I2C controller sends the most-significant byte of the address will write above-mentioned data to mass storage, and waits for its passback ACK;
Step 4, receive ACK after, the I2C controller sends the least-significant byte of the address will write above-mentioned data to mass storage, and waits for its passback ACK;
Step 5, receive ACK after, the I2C controller sends a byte of the data that need write to mass storage, and waits for its passback ACK;
Step 5 ', the size of the data that write if desired is a byte, then directly forwards step 6 to; The data that write if desired are greater than a byte, and repeating step 5 all writes up to the data of designated length, forwards step 6 to;
Step 6, receive ACK after, send the stop order.
Wherein, the write operation order in the step 2 is a byte, and its 1-7 position is used to determine operate specifically selected slave controller, the address of above-mentioned mass storage just, and its 8th is 0, expression is used to determine that current operation is a write operation.Above-mentioned writeable data mostly are 15 bytes most.
Adopt the method for the invention can advantages of simplicity and high efficiency to realize the storage medium of standard I 2C controller access greater room, effectively enlarge the available address space of I2C utility appliance, for the I2C utility appliance provides more strong functions.Its advantage is as follows: do not change existing I2C controller, circuit does not make any changes, and is realized by software fully, guarantees the compatibility of hardware.
Below in conjunction with accompanying drawing, concrete enforcement of the present invention is described in further detail.For those skilled in the art that, from the detailed description to the inventive method, above-mentioned and other purposes of the present invention, feature and advantage will be apparent.
Description of drawings
Fig. 1 is the form of data transmission on the I2C bus.
Fig. 2 is the data stream from the operation of a byte of current read address.
Fig. 3 writes the data stream of the operation of a byte to the address of appointment for the I2C controller.
Fig. 4 writes the data stream of the operation of a consecutive data block to the address of appointment for the I2C controller.
Fig. 5 reads the data stream of the operation of a byte for the I2C controller from assigned address.
Fig. 6 reads the data stream of the operation of a consecutive data block for the I2C controller from the current address.
Fig. 7 is the data stream greater than the storer byte read operation in 1K bytes of memory space.
Fig. 8 is the data stream greater than the storer byte write operation in 1K bytes of memory space.
Fig. 9 reads the data stream of the operation of a consecutive data block for the storer greater than 1K bytes of memory space.
Embodiment
Below in conjunction with the drawings and specific embodiments method of the present invention is described in further detail.
Some mass storages, particularly greater than the storer in 1K bytes of memory space, some operations with the operation compatibility of the I2C controller of 10 bit addressing patterns of employing are provided, have comprised: by byte write, by page or leaf write, the current address read/write, with machine-readable, read by page or leaf etc.Several modes of operation commonly used are discussed below.
(1) from byte of current read address: the mode of operation of mentioning this mode of operation and the background technology from a byte of current read address is duplicate, no longer discusses at this.
(2) write a byte to the current address: the mode of operation of mentioning in this mode of operation and the background technology from a byte to the current address that write is duplicate, no longer discusses at this.
(3) from byte of address read of appointment: allow to adopt arbitrary address in the whole space of I2C controller random access of 10 bit addressing patterns with machine-readable mode, before read data, must carry out an empty write operation earlier, bidirectional data line SDA is passed in the address of the byte that will read, and carries out the read operation of a current address then.
Fig. 7 has represented to read at random from the storer greater than 1K bytes of memory space the flow process of a byte, and this flow process is very big with the flow process difference of the I2C controller of the 10 bit addressing patterns of employing, and the independent flow process of neither one can independently be finished this function.This method combines the operating process of a plurality of standards, realizes reading at random from mass storage the function of a byte.Basic thought be utilize employing 10 bit addressing patterns as shown in Figure 3 the I2C controller to assigned address write the operation of a byte and as shown in Figure 2 get up to realize this function from the operative combination of a byte of current read address.Concrete step comprises at least:
The first step: the I2C controller sends a Start signal;
Second step: the I2C controller sends the write operation order, and waits for storer response ACK;
The 3rd step: after receiving ACK, the I2C controller sends the most-significant byte of assigned address to storer, and waits for storer response ACK;
The 4th step: after receiving ACK, the I2C controller sends the least-significant byte of assigned address to storer, and waits for storer response ACK;
The 5th step: after receiving ACK, send a Start signal;
The 6th step: the I2C controller sends the read operation order to storer, and waits for storer response ACK;
The 7th step: after receiving ACK, a byte of I2C controller reading of data from storer, and wait for storer response ACK;
The 8th step: send the STOP order.
Fig. 9 represents the operation of knowing clearly and reading a consecutive data block at random from the storer greater than 1K bytes of memory space.Reading the flow process of a consecutive data block from mass storage at random with the key distinction that reads the flow process of a byte from mass storage at random is: after the I2C controller of the 10 bit addressing patterns of employing successfully reads first byte, do not finish read operation immediately, but continue to wait for that mass storage sends data to the I2C controller of the 10 bit addressing patterns of employing, read just to finish this read operation after the data designated length.This method combines the operating process of a plurality of standards, finishes the function that reads a consecutive data block from mass storage at random.Concrete step comprises at least:
The first step: the I2C controller sends a Start signal;
Second step: the I2C controller sends the write operation order, and waits for storer response ACK;
The 3rd step: after receiving ACK, the I2C controller sends the most-significant byte of assigned address to storer, and waits for storer response ACK;
The 4th step: after receiving ACK, the I2C controller sends the least-significant byte of assigned address to storer, and waits for storer response ACK;
The 5th step: after receiving ACK, send a Start signal;
The 6th step: send the read operation order, and wait for storer response ACK;
The 7th step: after receiving ACK, a byte of I2C controller reading of data from storer, and wait for storer response ACK;
The 8th step: repeat the operation of the 7th step, up to the data that read all requirements, the data read operation of each byte all will be waited for storer response ACK;
The 9th step: send the STOP order.
(4) write a byte to assigned address: the operation that the assigned address to storer mentioned is write a byte in this operation and the background technology comparatively speaking, many addresses of a byte, other place all is just the same, as shown in Figure 8.
Careful comparison diagram 4 and Fig. 8, the treatment scheme of being not difficult to find Fig. 4 has only been sent a bytes of memory device address after sending write order, and the back can write the data of 1-16 byte continuously; Fig. 8 treatment scheme requires to send two bytes of memory device addresses, the data of another byte of back behind write order.For storer, data and byte all are some byte streams, and it can not also there is no need to distinguish.So this method is just utilized these characteristics, the I2C controller of use employing 10 bit addressing patterns writes two bytes with the treatment scheme of Fig. 4 to the designated memory address, realizes the function to a byte of mass storage random writing.The step of write operation comprises at least:
The first step: the I2C controller sends a Start signal;
Second step: the I2C controller sends the write operation order, and waits for storer response ACK;
The 3rd step: after receiving ACK, the I2C controller sends the most-significant byte that will write above-mentioned memory of data address to storer, and waits for storer response ACK;
The 4th step: after receiving ACK, the I2C controller sends the least-significant byte that will write above-mentioned memory of data address to storer, and waits for storer response ACK;
The 5th step: after receiving ACK, the I2C controller sends the data that will write to storer, and waits for storer response ACK;
The 6th step: after receiving ACK, the I2C controller sends the STOP order.
The I2C controller that adopts 10 bit addressing patterns is to the key distinction that the mass storage random address writes a consecutive data block (buffer writes) and writes a byte (byte is write), after the data of a byte send successfully, do not finish this write operation, and send a plurality of bytes continuously, just send after the success and write the finish command.So such operations flows can be utilized the buffer of the I2C controller that adopts 10 bit addressing patterns to write flow process and realize.Anatomizing Fig. 4 can find, can utilize the flow process of Fig. 4, does slightly to change and can realize that the buffer of mass storage writes function.Because the restriction of two kinds of equipment, the mono-recordable operation that the buffer that this method realizes writes can write 15 bytes at most.Concrete step is:
The first step: the I2C controller sends a Start signal;
Second step: the I2C controller sends the write operation order, and waits for storer response ACK;
The 3rd step: after receiving ACK, the I2C controller sends the most-significant byte that will write above-mentioned memory of data address to storer, and waits for storer response ACK;
The 4th step: after receiving ACK, the I2C controller sends the least-significant byte that will write above-mentioned memory of data address to storer, and waits for storer response ACK;
The 5th step: after receiving ACK, the I2C controller sends first byte of the data that will write to storer, and waits for storer response ACK;
The 6th step: repeat the operation of the 5th step, up to sending the data that all requirements write, each data byte transmit operation all will be waited for storer response ACK;
The 7th step: after receiving ACK, the I2C controller sends the STOP order.
Under the situation that does not deviate from invention spirit and essence thereof, those of ordinary skill in the art work as can make various corresponding changes according to the present invention, but these corresponding changes all should belong to the protection domain of claim of the present invention.
Claims (6)
1. method that adopts the I2C controller access mass storage of 10 bit addressing patterns, it is characterized in that above-mentioned I2C controller from mass storage at random the operation of reading of data may further comprise the steps at least:
Step 1, the I2C controller sends a commencing signal;
Step 2, the I2C controller sends the write operation order to mass storage, and waits for its passback response bit;
Step 3, receive response bit after, the I2C controller sends the most-significant byte of the address of above-mentioned data to mass storage, and wait for its passback response bit;
Step 4, receive response bit after, the I2C controller sends the least-significant byte of the address of above-mentioned data to mass storage, and wait for its passback response bit;
Step 5, receive response bit after, the I2C controller sends a commencing signal again;
Step 6, the I2C controller sends the read operation order to mass storage, and waits for its passback response bit;
Step 7, receive response bit after, the I2C controller reads a byte of above-mentioned data from mass storage, and wait for its passback response bit;
Step 7 ', if the size of data that reads is a byte, then directly forward step 8 to; If the data that read are greater than a byte, repeating step 7 all reads up to the data of designated length and to finish, and forwards step 8 to;
Step 8, receive response bit after, transmission is ceased and desisted order.
2. method according to claim 1 is characterized in that:
Write operation order in the step 2 is a byte, and its 1-7 position is used to determine operate specifically selected slave controller, the address of above-mentioned mass storage just, and its 8th is 0, expression is used to determine that current operation is a write operation.
3. method according to claim 1 is characterized in that:
Read operation order in the step 6 is a byte, and its 1-7 position is used to determine operate specifically selected slave controller, the address of above-mentioned mass storage just, and its 8th is 1, expression is used to determine that current operation is read operation.
4. method that adopts the I2C controller access mass storage of 10 bit addressing patterns, the operation of reading of data may further comprise the steps at least to it is characterized in that writing at random to mass storage by above-mentioned I2C controller:
Step 1, the I2C controller sends a commencing signal;
Step 2, the I2C controller sends the write operation order to mass storage, and waits for its passback response bit;
Step 3, receive response bit after, the I2C controller sends the most-significant byte of the address will write above-mentioned data to mass storage, and waits for its passback response bit;
Step 4, receive response bit after, the I2C controller sends the least-significant byte of the address will write above-mentioned data to mass storage, and waits for its passback response bit;
Step 5, receive response bit after, the I2C controller sends a byte of the data that need write to mass storage, and waits for its passback response bit;
Step 5 ', the size of the data that write if desired is a byte, then directly forwards step 6 to; The data that write if desired are greater than a byte, and repeating step 5 all writes up to the data of designated length, forwards step 6 to;
Step 6, receive response bit after, transmission is ceased and desisted order.
5. method according to claim 4 is characterized in that:
Write operation order in the step 2 is a byte, and its 1-7 position is used to determine operate specifically selected slave controller, the address of above-mentioned mass storage just, and its 8th is 0, expression is used to determine that current operation is a write operation.
6. method according to claim 4 is characterized in that above-mentioned data mostly are 15 bytes most.
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