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Directory public static File Getdownloadcachedirectory () Ordinary Get the downloaded cache directory public static File getExternalStorageDirectory () Ordinary Get the Extended storage directory public static String Getexternalstoragestate () Ordinary Get the status of an extended storage device public static File Getrootdirectory () Ordinary Get root directory public static Boolean is
-terminated shell command string,This line of command will be uploaded to Bin/sh and using the-C flag,Then the shell will execute this command to read from this string."R"); Standard output of a file pointer connected to a shell command if (NULL = fp){Break} while (NULL!= fgets (castdoutline, sizeof ( Castdoutline), fp) { //If you find the SD card mount path you want, if (judgment condition
for Android2.3 of systems,environment.getexternalstoragedirectory () Get the directory is built-in SD card or external SD card is not guaranteed, and the handset manufacturer's modification, Can only be judged by environment.isexternalstorageremovable ().,If True is external, because external can be uninstalled. (But I
This section provides sample code for the msp430f5438a SPI Read and write SD card, using the official library msp430_driverlib_2_60_00_02, using IAR for msp430 6.3 by compiling. This section of the code does not differentiate the SD card, so only the SDHC card is operated, a
specific command set. Class10-11: Reserved. 3.3.sd card Workflow First, let's take a look at how the operating system runs on the ARM processor.Read and Write the current SD card. The process can be divided into three major steps: initializing the SD
);//this thing is disgusting. In the SD card and the parameters of the MMC card is not the same as the parameters of the MMC card is set to an RCA value, but the SD card is read by the value of RCA, the above
, Msc_cmdat_bus_width_4bit | msc_cmdat_response_r1| Msc_cmdat_busy, MSC_CMDAT_RESPONSE_R1);//Response type R1b//while (! INREG16 (A_msc_stat (0)) (1 Mmc_init_gpio (); __msc_reset (); Mmc_irq_mask (); OUTREG32 (A_MSC_CLKRT (0), 7),//extclk/128//outreg32 (A_MSC_LPM (0), 0x01); sd2_0 = 0; Default to standard SD card resp = mmc_cmd (0, 0, 0);//First 80 clocks RESP = mmc_cmd (
, Msc_cmdat_bus_width_4bit | msc_cmdat_response_r1| Msc_cmdat_busy, MSC_CMDAT_RESPONSE_R1);//Response type R1b//while (! INREG16 (A_msc_stat (0)) (1 Mmc_init_gpio (); __msc_reset (); Mmc_irq_mask (); OUTREG32 (A_MSC_CLKRT (0), 7),//extclk/128//outreg32 (A_MSC_LPM (0), 0x01); sd2_0 = 0; Default to standard SD card resp = mmc_cmd (0, 0, 0);//First 80 clocks RESP = mmc_cmd (
eMMCThe Sdio:secure Digital Input and Output CARD,SD standard defines a peripheral interface, which is used by many device modules. such as Wifi,gps,bluetooth1.2 SD card FeaturesThe following are some of the features of the SD card
semiconductor flash memory. TF Card is a very small flash memory card, using SanDisk latest NAND MLC Technology and controller technology. Difference between TF card and SD card 5: Use to differentiate SD cards are widely use
1. The most detailed analysis and code HTTP://ELM-CHAN.ORG/DOCS/MMC/MMC_E.HTML2 of the SD card SPI mode have been seen so far. Reprint http://blog.csdn.net/ming1006/ article/details/7281597Now our cell phone memory is micro SD card, also known as TF card, so micro
card read and write through the SPI interface, SPI clock with fro 12M clock, so this read and write speed is appropriate. SD card read and write speed with the card speed level, data transmission rate, read and write more than one block read and write faster, here test one-time reading
, hcardinsertinterruptevent, null, 0) 8. Improve the while part of the code of the thread sdcarddetectistthread () and add waitforsingleobject (hcardinsertinterruptevent, dwtimeout). Only when the cursor is set, it will go down. Otherwise, it will wait here. 9. Rewrite cardremoveinterrupt in the same principle as above to dynamically uninstall the SD card master
does not have a unified name or location. So this is a more difficult part, but fortunately Android is open source, we can run to determine whether the phone has a TF card, and whether the TF card is available.The following method can be obtained from the phone can be stored, including SD card, TF
falling edge.6. Define hcardinsertinterruptevent in the Impl.c file and create hcardinsertinterruptevent within setupcarddetectist ()The 7.impl.c file initializes the dwsysintrcd= Sysintr_sdmmc_detect and binds the corresponding event:interruptinitialize (DWSYSINTRCD, hcardinsertinterruptevent,null,0)8. Improve the while part code of Thread Sdcarddetectistthread (), add WaitForSingleObject (Hcardinsertinterruptevent, dwtimeout); It is only when hcard
tool. In this tool, you can find which drives windows can "see", and this list of drives may include drives without drive names. If you can't find your SD card in the drive list (Figure 6), it may be completely broken, or the reader will fail (possibly due to driver problems). 06 If the SD card
BL1 code. 3) BL1 can initialize the system clock, UART, SDRAM, and other devices, and then copy bootloader2 (bl2) to the address memory of the SDRAM. 4) then jump to the "bl2" in the SDRAM to continue running. bl2 supports more powerful functions, and further initializes the hardware and copies the wince kernel image to the memory of the (0x80100000) Address of the SDRAM. 5) execute NK again in the SDRAM mode. Figure 2 startup modes supported by cloud6410 Here is an uncertain problem. irom_ap
structure of the FAT file system. During formatting, set MBRThe data in the partition and DBR areas is not the last 8 in the SD card storage area.MB area (can be increased or decreased according to actual needs) for formatting, that is, it is set to raw area. Therefore, the implementation of system kernel backup is to fill the system kernel code with the
before the related SD initialization work can be performed, he can still initialize it. for(i=0;i However, it may be better to perform initialization more successfully. Therefore, we have to give it 74 clocks. It doesn't matter! 2. The protocol says that when we reset or power on, the SD control register of the SD card
The SD card uses a fat (File Allocation Table) file system and does not support access mode and permission control. The SD card is suitable for storing large-sized files or files without the need to set access permissions.Android simulators support SD
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