I found that WinPrint or Var.WRITE can only write up to 4095 bytes to the file at a time. For larger size structures, the data out of limits will be lost. To avoid this, we can write multiple times according to the member order.
( If we only know the name of a structure and load the elf through T32, we can find it in the symbol list and view all its members. So, can we get the member name of the structure by some T32 command and then log to file according to the name like Var.WRITE #1 StructA.memberName )
WinPrint.<command>
The WinPrint pre-command is used to generate a hardcopy or a file from one command. The numbers of
columns and lines in the window are adapted to the possibilities of the printer. Printer selection can be
executed by the PRinTer command.
Thus, the output can also be re-routed to a file. In the case of some commands, extended parameters are
possible for printing more than one page.
WinPrint.var.view %m.3 %r.3 structName
This command can output all the contents of the structure to a file. Because var.view is not restricted by 4095, all the contents can be saved to a file.
m stands for multiline. It displays the structure elements in multiple line format. If the elements are in a multidimensional array, the numeric parameter defines the number of levels displayed.
r stands for recursive. This optional number defines the depth of recursion to be displayed. The command SETUP.VarPtr defines the valid address range for pointers. The contents of pointers outside this range are not displayed.
Related
Because I have to use a third-party bootloader which cannot handle varying lengths of lines in an SREC file, I need a way to instrument objcopy to create a SREC file, where every S1 line has the same lengths (if no info from ELF file is provided, it should be filled with FF).
We can assume that the address increments are consistent, so we do not jump higher in addresses than our specified line length. So we do not need to create in-between lines with all FF e.g.
I found out about --srec-len but this only sets the maximum length size.
I would need something that sets a fixed length size, is there something I can use?
A possible solution would be also to transform the earlier generated SREC file from objcopy with a (third-party) tool
You can try the srec_cat utility to do this. Following is an example command.
"srec_cat long.srec −o short.s19 −line-length=46"
I have been trying to figure out what the best way to do this would be, but haven't quite found an answer yet. I have a float array full of data collected from an inertial sensor and I would like to put it into the right format and output it to a CSV file. I'm using an mbed microcontroller with a local file system to store the file. It's the part about getting the format right that is confusing me at the minute.
I'd like my gyroscope/accelerometer values to be displayed in rows such as:
gx1, gy1, gz1, ax1, ay1, az1
gx2, gy2, gz2, ax2, ay2, az2
gx3, gy3, gz3, ax3, ay3, az3
I think these values first need to be converted to char before being written to the file, so I will need to do that and store them in a new array of type char. That's where I get confused, because I don't just want to copy the data into this new array all at once (thinking of using a for loop and spritf()) but I also want it to be formatted as displayed above, with the right breaks between rows.
The function that writes the content of the array to the file takes the array, its types size, the array size and the file object.
fwrite(converted_array, sizeof(char), sizeof(converted_array), FileObject);
What would be the best way to make sure that the array content is formatted like I want it to be?
I am trying to log the contents of a structure to a file with a practice script.
I would rather not use Var.VALUE for every field of the struct and so far I have found the Var.PRINT command which displays all the information contained in the struct.
However I do not know if I can output this to a file, or if there is any other solution I'm not aware of for logging the values of a struct.
These three scripts can log the contents of a structure.
cmm1
PRinTer.FILE c:\temp\temp1.txt
WinPrint.v.v struct_name
TYPE c:\temp\temp1.txt
ENDDO
cmm2
PRinTer.FILE c:\temp\temp2.txt
WinPrint.v.v %all struct_name
TYPE c:\temp\temp2.txt
ENDDO
cmm3
PRinTer.FILE c:\temp\temp3.txt
WinPrint.v.v %m.4 %r.5 struct_name
TYPE c:\temp\temp3.txt
ENDDO
The cmm1 script will save the first level content.
The cmm2 script will save the first level content along with data type.
The cmm3 script will save the pointer value recursively.
m stands for multiline. It displays the structure elements in multiple line format. If the elements are in a multidimensional array, the numeric parameter defines the number of levels displayed.
r stands for recursive. This optional number defines the depth of recursion to be displayed. The command SETUP.VarPtr defines the valid address range for pointers. The contents of pointers outside this range are not displayed.
I have question with open command of fortran.
OPEN (UNIT = , FILE=file-name, ACCESS=access, FORM=form, RECL=recl)`
Access = sequential, direct
FORM=formatted, unformatted
recl is is the record length in bytes for a file
I tried searching a lot, but could not get what is meaning of sequential or direct access, formatted or unformatted file, record length of a file. Can someone explain me what these terms mean?
File access specifies how the file will be written to (or read from) after opening. Opening with one access mode, but reading/writing consistent with another access mode, often results in a runtime error.
Sequential access, naturally enough, implies reading and writing sequentially. Writing sequentially means that output is placed in the output file in the same order that the program produces it so, if X is output before Y, the file will contain X before (closer to the beginning of the file) than Y. Reading sequentially means that reading occurs from start toward end of the file. Append access is a special form of sequential access which starts at the end of the file (so write operations add to the end of the file).
Direct access means that contents of the file can be accessed in any order. This is also called random access. Essentially, when performing input or output, the program must specify the position in the file where the operation is to occur.
The position in the direct access file in Fortran is specified in terms of "records", which all have exactly the same length (specified by the RECL= clause when the file is opened). So, if a file contains 20 records and has record length equal to 30, the total size of data the program can access from the file is 600 bytes, and every read or write operation will access a record containing 30 bytes.
An unformatted file basically means the contents of the file are read and written as a stream. An unformatted sequential access file is the equivalent of a binary file in languages like C that is read from beginning to end. An unformatted direct access file is also binary, but operations can access the file in any order (under control of the program).
A formatted file essentially means that all reading and writing must involve a format specification. There are also some special treatments such as, when writing, a newline marker written to the file at the end of every write statement.
A straight text file is typically opened as a sequential access formatted file. Every Fortran read or write operation acts on a new line (so two write statements will produce two lines in the file, and two corresponding read statements will be need to read them back in).
It is possible to have a formatted direct access file. This basically means the read and write statements must specify formats to read/write the records, but records can be accessed in any order. The ends of records are typically marked with newlines.
It's easy to find on the web (including discussion here):
A "record" is data, usually in characters. Some files have records which are all the same length, some do not. In between, there are files which store the length of each record as part of the record. It is simplest to work with files having records which are all the same length, because (for many storage devices) you can compute the beginning of a particular record by knowing the record number and the length of the records. If the records are different lengths, it is more work to keep track of the record locations.
sequential files are accessed one record at a time, like a tape (see this page for length discussion). As a rule, tapes could be rewound, read forward, but reading at a random point was harder. Doing that is direct access. This page makes it clear that there is a distinct choice between the two - you can have one or the other.
Formatted output is just that - making the output follow some report-style format (on the level of lines), while unformatted output does not follow tidy rules. See Fortran unformatted file format for examples of discussion. On a more technical slant, this page at Oracle goes into more depth.
Using c++, is it possible to store data to a file, and retrieve that data by address for quicker access? I want to get around having to parse or iterate large files of data, with the ability to gain direct access to a subset of that data. In your answers, it does not matter how the data is stored; whatever works best with the answer you have.
Yes. Assuming you're using iostreams, you can use tellg and tellp to retrieve the current get and put (i.e., read and write) locations respectively. You can later feed the same value back to seekg or seekp to get back to the same location (again, for reading or writing respectively).
You can use these to (for one example) create an index into a file. Before writing each record to your primary data file, you'd use tellp to retrieve the current location. Then you'd store the data to the data file, and save the value tellp returned into the index file. Depending on what sort of index you want, that might just contain a series of locations, so you can seek directly to record #N in the data file (even if the records are of different sizes).
Alternatively, you might store the data for some key field in the index file. For example, you might have a main data file with a set of records about people. Then you might build a number of indices into that, one with last names and a location for each, another with birthdays and a location for each, and so on, so you can search by name or birthday (or do an intersection between them to support things like people older than 18 with a last name starting with "M", "N" or "O").