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update about sie of buffs

gullradriel 2024-01-05 15:42:07 +01:00
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SD-Card-(DEV).md

@ -149,6 +149,15 @@ if(check_sd_card()) { // Check to see if SD Card is mounte
}
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## A word about reading and writing
In both mode a hardware limit is preventing any buffered read higher than blocks of 512 to be read or write
**!! While you can and will do buffered read/write, the size of the buffer must not be higher than 512 !!**
See the [related issue discussion](https://github.com/eried/portapack-mayhem/issues/1103)
### Read File
To read to a file the `read_file()` function from the [File](https://github.com/eried/portapack-mayhem/blob/next/firmware/application/file.cpp) class can be used. The helper function below will return true if the class object `File` opens the file successfully. Success from this open function will have a `is_valid()` function which will return a 0, other values means failure. Inputs for file path and directory name. Again the input for the file path is a `std::filesystem::path` which can be `UTF-16 string literal`. The root of the SD Card is `u""` and any directory beyond that is `u"DIRECTORY/SUB_DIRECTORY"`