sd card data logger

Sometimes in order to need, the database will be saved to the external storage or SD card (for this situation can be encrypted data to prevent data from being cracked), such as an application to support multiple data, each data ne

Recently, we are studying the driver of pxa300 SD card.Program, Figured out the SD card initialization process, the record is as follows 1. The pxamci_probe () function calls mmc_alloc_host () to allocate the mmc_host structure and initializes the mmc_rescan latency task. 2. initialize the mmc_host structure, initialize the MMC hardware controller registers,

How to create an Exynos 4412 u-boot disk using the TF/SD card in Ubuntu/*************************************** **************************************** ** @ Author Maoxiao Hu * @ version V1.0.1 * @ date Feb-2015 ************************** **************************************** * *********** Sudo hexdump-n 1048576/dev/sdb -N 1048576 indicates that the first 1 M = 1024*1024 = 1048576 bytes of

My cell phone SD card needs to be divided into two partitions, under the WINDOWXP. The main problem is that Windows only knows the first partition of the SD card. Someone used to modify the driver, let Windows recognize SD card as

the SD card program in EVC. At first, I thought I could malloc dozens of MB of memory like a PC, the results showed that it was very slow to read a K tablet. It seems that the idea of one-time read/write of 30 m is not feasible. Today, the 30 m Kernel File is successfully read and written in segments. The following is the key code. C/C ++ code // It is feasible for me to read 30 m Fil

Now the application is getting heavier, for example, and so on, a little bit of time, will occupy dozens of MB or even hundreds of megabytes of space. And sometimes even the phone will appear "no response" phenomenon, you need to choose "continue to wait" or "forcibly shut down", before the number of times, no response I directly to the forced restart, the results found that after the restart, "SD card is c

the underlying function is sd_init. Simply let it return 0 in Disk_status, indicating success. Disk_read can see that the input has four parameter values, namely the device type PDRV, the data buffer pointer buff, the sector address sector, and the number of sectors count. This shows that Disk_read can read more than one sector at a time, adding in the function body for (cnt=0; cnt Res =sd_readsingleblock (sector+cnt, buff+cnt*512); if (res! = RES_OK

background debugging interface) starts with two bytes for 0x00 0x02 for 0x0200=512 bytes. 512 bytes per sectorThe next 0xD position is 0x08, representing a cluster with 8 sectorsThe next two positions in 0xE are: 0x26 0x00 stands for 38 reserved sectors, that is, each fat table is in the same sector as the boot sector (97) +38The next 0x02 represents a two fat table with a position number of 16 and an actual offset of 0--16The next 00 00 and 0x0200=512. Represents FDT (Directory area) has 512 r

?? Sometimes the database is saved to an external storage or SD card for your needs (this can be done by encrypting data to prevent data from being cracked), such as an application that supports multiple data, every data needs a c

The first step is to increase the access rights of the SD card in Androidmanifest.xmldoes the SD card existPrivate Boolean Existsdcard () { if (android.os.Environment.getExternalStorageState (). Equals ( Android.os.Environment.MEDIA_MOUNTED) { return true; } else return false; }

========================================================== ================================== Title: Support for SD card addition by wince Abstract: Note: Windows CE 5.0 Date: 2010.5.5 Name: Zhu minglei ========================================================== ================================== The drivers and components to be added are as follows: ① Device Drivers | SDIO |

Recently, when working on the andoird project, we often encounter different machine models on the client side, resulting inProgramThere is a bug problem, and we cannot locate the exact location of this bug (because there is no log file ). So I found the relevant information about writing program logs to the SD card, just like the Web log4j, to generate a log file to the

When we do Android development, we often have this experience, because the customer's device models are different, resulting in a variety of problems, but for developers, because there is no log log files, it is not easy to locate the exact location of the problem. So we need a tool that can write the program log to the SD card file, like the Web log4j. At this time microlog4android into our vision, althoug

Android-create a database to the SD cardSQLite comes with SQLiteOpenHelper, while SQLiteOpenHelper stores the database to/data/package name/databasas, in this case, the SQLite database cannot be seen on a mobile phone without a root user. So, in another way, store the database SQLite on the SD card. The getWritableData