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Linux Driver

Linux Driver. SD Card 期末報告. Team4 ： 694415016 曹啟訓 490415046 許弘達. Architecture. PC. SD card. net. UART. Command line (SPI). MI0101. Program outline. Use Block device driver architecture The SPI messages consist of command 、 response and data-block tokens

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Linux Driver

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  1. Linux Driver SD Card 期末報告 Team4： 694415016 曹啟訓 490415046 許弘達

  2. Architecture PC SD card net UART Command line (SPI) MI0101

  3. Program outline • Use Block device driver architecture • The SPI messages consist of command、response and data-block tokens • The Card-Specific Data (CSD) register provides information on how to access the card contents • Card detect uses GPIO interface to get the value from SD card pin, in order to judge whether SD card exist or not. • Write Protect uses GPIO interface to get the value from SD card pin, in order to judge whether SD card write protect exist or not.

  4. Program flowchart module_init() • driver init 註冊major number、device name，以及記錄操作指令的資訊 sd_driver_init() 連結 request 與 queue ，並且初始化 request queue Register_blkdev() blk_init_queue() sd_card_init( ) ： 初始化 sd card Sd_card_config( ) ： 得到 sd card 特定資料 Set timer 確認sd card是否偵測到 ? 清除sd_driver_init( )的設定 yes no Sd_init() check media() Sd_exit()

  5. Program flowchart (cont.) 得到 sd card 和 buffer 的位址；再判斷 command來做 read和 write的動作。 request Sd_request() 一次讀取 512 bytes 的資料 CMD READ mmc_read_block 一次寫入 512 bytes 的資料 CMD WRITE mmc_write_block 1：成功 0：失敗 end_request()

  6. Program flowchart (cont.) • exit function module_exit() delete timer sd_driver_exit() 指定 major number和device name unregister_blkdev() 釋放 request queue blk_cleanup_queue() 清除sd_driver_init( )的設定 sd_exit()

  7. 實驗步驟 1 • 將SD驅動程式，sd.c、crc.h以及spi_reg.h放置於block資料夾中。 # cp sd.c crc.h spi_reg.h /data/develop/uClinux/uClinux- dist.20020502/linux-2.4.x/drivers/block/ • 註冊device name, major number, minor number # vi /data/develop/uClinux/uClinux-dist.20020502/vendors/ Mcrolinks/ML-i0101/Makefile 加上這一行 mmca,b,121,0 mmca1,b,121,1 \ • 定義三態，按鈕名稱，對應Makefile的名子 # vi /data/develop/uClinux/uClinux-dist.20020502/linux- 2.4.x/drivers/block/Config.in 加入這一行 tristate 'SD/MMC card support' CONFIG_BLK_DEV_SD • 定義名子和對應的.o檔 # vi /data/develop/uClinux/uClinux-dist.20020502/linux- 2.4.x/drivers/block/Makefile 加入這一行 obj-$ (CONFIG_BLK_DEV_SD) += sd.o

  8. 實驗步驟 2 • 選取kernel支援的模組 [/uClinux-dist.20020502/]# make xconfig

  9. 實驗步驟 3 選取 Block devices -> SD/MMC Card Support，勾選”m”，將SD/MMC卡驅動程式編寫成模組(modules)的型態

  10. 實驗步驟 4 新增加的SD card 選項 選取module 的形式

  11. 實驗步驟 5 • 完成基本設定，開始編譯image檔 [/uClinux-dist.20020502/]# make dep ; make • 等待10到30分鐘左右，新的image檔將會產生在/data/devplop/uClinux/uClinux-dist.20020502/images • 執行minicom，連到I0101後，再載入新的 image 檔 • I0101重新開機後，將模組化的SD/MMC driver，使用insmod指令安裝於作業系統上，輸入指令如下： /> insmod sd.o

  12. 實驗步驟 6 • 將SD device掛載到系統card A點上，輸入指令如下： /> mount –t vfat /dev/mmca1 /card/A • 查看SD卡裡面的檔案： /># ls /card/A /># cp /usr/10.mp3 /card/A /># ls /card/A • 使用者若要移除SD/MMC driver可以在minicom終端機執行以下指令： /># umount /card/A /># rmmod sd

  13. END Thanks

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