【導讀】本文設計了一種基于mini2440的MP3音樂播放器。設計中采用廣州友善之臂科技有。的6個按鍵來控制播放。由于Linux具有可移植度高、自由、免費等特性，最近幾年，它。以linux系統(tǒng)的移植為核心來描述一個MP3播放器實現的整個過程。在人們的日常生活中也扮演著越來越重要的角色。目前，計算機和網絡已經全面滲透到日常生活的每一個角落。制的計算機機器。任何一個普通人都可能擁有從小到大的各種使用嵌入式技術的。目前，各種各樣的新型嵌入式系統(tǒng)設備在應用數量上已經遠遠超過。在工業(yè)和服務領域中，使用嵌入式技術的數字機床、智能工具、工業(yè)機器人、服務機器人正在逐漸改變著傳統(tǒng)的工業(yè)生產和服務方式。本文重點討論了基于mini2440的MP3的功能的實現，包括開發(fā)環(huán)境建立、內核配置與編譯、按鍵控制等一系列詳細過程。定和成熟，嵌入式系統(tǒng)也不例外。20世紀70年代單片機的出現，使。來獲得更佳的使用性能，更容易使用、更快、更便宜。這些裝置已經初步具備了。序，還談不上系統(tǒng)的概念。

　　

【正文】 D hash table entries: 256 (order: 2, 1024 bytes) Dentry cache hash table entries: 8192 (order: 3, 32768 bytes) Inodecache hash table entries: 4096 (order: 2, 16384 bytes) Memory: 64MB = 64MB total Memory: 60596KB available (3588K code, 417K data, 132K init, 0K highmem) SLUB: Genslabs=11, HWalign=32, Order=03, MinObjects=0, CPUs=1, Nodes=1 Hierarchical RCU implementation. NR_IRQS:85 irq: clearing subpending status 00000002 Console: colour dummy device 80x30 console [ttySAC0] enabled Calibrating delay loop... BogoMIPS (lpj=504832) Mountcache hash table entries: 512 CPU: Testing write buffer coherency: ok NET: Registered protocol family 16 S3C2440: Initialising architecture S3C2440: IRQ Support S3C24XX DMA Driver, (c) 20212021,2021 Simtec Electronics DMA channel 0 at c4808000, irq 33 DMA channel 1 at c4808040, irq 34 DMA channel 2 at c4808080, irq 35 DMA channel 3 at c48080c0, irq 36 S3C244X: Clock Support, DVS off bio: create slab bio0 at 0 usbcore: registered new interface driver usbfs usbcore: registered new interface driver hub usbcore: registered new device driver usb s3ci2c s3c2440i2c: slave address 0x10 s3ci2c s3c2440i2c: bus frequency set to 98 KHz s3ci2c s3c2440i2c: i2c0: S3C I2C adapter NET: Registered protocol family 2 IP route cache hash table entries: 1024 (order: 0, 4096 bytes) TCP established hash table entries: 2048 (order: 2, 16384 bytes) TCP bind hash table entries: 2048 (order: 1, 8192 bytes) TCP: Hash tables configured (established 2048 bind 2048) TCP reno registered NET: Registered protocol family 1 RPC: Registered udp transport module. RPC: Registered tcp transport module. RPC: Registered tcp backchannel transport module. JFFS2 version . (NAND) ? 169。 20212021 Red Hat, Inc. ROMFS MTD (C) 2021 Red Hat, Inc. msgmni has been set to 118 alg: No test for stdrng (krng) io scheduler noop registered io scheduler anticipatory registered (default) io scheduler deadline registered io scheduler cfq registered s3c2410lcd s3c2410lcd: no platform data for lcd, cannot attach s3c2410lcd: probe of s3c2410lcd failed with error 22 : s3c2410_serial0 at MMIO 0x50000000 (irq = 70) is a S3C2440 : s3c2410_serial1 at MMIO 0x50004000 (irq = 73) is a S3C2440 : s3c2410_serial2 at MMIO 0x50008000 (irq = 76) is a S3C2440 brd: module loaded S3C24XX NAND Driver, (c) 2021 Simtec Electronics s3c24xxnand s3c2440nand: Tacls=3, 29ns Twrph0=7 69ns, Twrph1=3 29ns s3c24xxnand s3c2440nand: NAND soft ECC NAND device: Manufacturer ID: 0xec, Chip ID: 0xf1 (Samsung NAND 128MiB 3,3V 8b) Scanning device for bad blocks Creating 5 MTD partitions on NAND 128MiB 3,3V 8bit: 0x0000000000000x000000040000 : Uboot 0x0000000400000x000000060000 : param ftl_cs: FTL header not found. 0x0000000600000x000000560000 : Kernel uncorrectable error : 0x0000005600000x000040560000 : root mtd: partition root extends beyond the end of device NAND 128MiB 3,3V 8bit0 ftl_cs: FTL header not found. 0x0000000000000x000040000000 : nand mtd: partition nand extends beyond the end of device NAND 128MiB 3,3V 8bit0 dm9000 Ether Driver, ohci_hcd: USB 39。Open39。 Host Controller (OHCI) Driver s3c2410ohci s3c2410ohci: S3C24XX OHCI s3c2410ohci s3c2410ohci: new USB bus registered, assigned bus number 1 s3c2410ohci s3c2410ohci: irq 42, io mem 0x49000000 usb usb1: configuration 1 chosen from 1 choice hub 10:: USB hub found hub 10:: 2 ports detected usbcore: registered new interface driver libusual mice: PS/2 mouse device mon for all mice S3C24XX RTC, (c) 2021,2021 Simtec Electronics i2c /dev entries driver S3C2410 Watchdog Timer, (c) 2021 Simtec Electronics s3c2410wdt s3c2410wdt: watchdog inactive, reset disabled, irq enabled cpuidle: using governor ladder sdhci: Secure Digital Host Controller Interface driver sdhci: Copyright(c) Pierre Ossman usbcore: registered new interface driver hiddev usbcore: registered new interface driver usbhid usbhid: :USB HID core driver Advanced Linux Sound Architecture Driver Version . No device for DAI UDA134X No device for DAI s3c24xxi2s ALSA device list: No soundcards found. TCP cubic registered NET: Registered protocol family 17 drivers/rtc/: unable to open rtc device (rtc0) List of all partitions: 1f00 256 mtdblock0 (driver?) 1f01 128 mtdblock1 (driver?) 1f02 5120 mtdblock2 (driver?) 1f03 125568 mtdblock3 (driver?) 1f04 131072 mtdblock4 (driver?) No filesystem could mount root, tried: ext3 cramfs vfat msdos romfs Kernel panic not syncing: VFS: Unable to mount root fs on unknownblock(31,3) [c002e9f8] (unwind_backtrace+0x0/0xdc) from [c02d0390] (panic+0x40/0x120) [c02d0390] (panic+0x40/0x120) from [c0008e84] (mount_block_root+0x1d0/0x210) [c0008e84] (mount_block_root+0x1d0/0x210) from [c000911c] (prepare_namespac) [c000911c] (prepare_namespace+0x164/0x1bc) from [c000843c] (kernel_init+0xd) [c000843c] (kernel_init+0xd8/0x10c) from [c002a854] (kernel_thread_exit+0x0) 我們可以看到 Linux 內核啟動是可以識別出了 NandFlash 的大小和， ID號，還有我們分的 5 個分區(qū)的大小。 這時我們還沒有把我們的根文件系統(tǒng)燒寫進去，所以還是沒有辦法出來下面的這句話： Please press Enter to activate this console. 到此?；镜?Linux 內核就移植完了，下一步移植根文件系統(tǒng)。 相關驅動移植 按鍵驅動移植 1) 硬件原理 Mini2440 具有 6 個用戶測試按鍵，它們都是連接到 CPU 的中斷引腳。 6 個用戶 按鍵分別對應如下 CPU 資源引腳： 按鍵 對應的端口寄存器 對應的中斷 對應的復用功能 K1 GPG0 EINT8 僅有 GPIO 和中斷功能 K2 GPG3 EINT11 nSS1 K3 GPG5 EINT13 SPIMISO K4 GPG6 EINT14 SPIMOSI K5 GPG7 EINT15 SPICLK K6 GPG11 EINT19 TCLK 2) 驅動程序分析及編寫 在 /， 內容及詳細注釋如下： include linux/ include linux/ include linux/ include linux/ include linux/ include linux/ include linux/ include asm/ include linux/ include asm/ include mach/ include mach/ i