Embedded System Studying note 1/15

把 SD 卡初始化的程式寫出來了
真的是... 給他有點難寫...
SD protocol 是不會難, 但是寫起來就是有些眉腳
這邊卡那邊卡, 短短四百行程式寫了將近三個禮拜

手邊剛好有幾張 SD 卡, 給他讀看看...
TOSHIBA 128M/ 創見2G/ 創見2G 150x/ Apacer 8G


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TOSHIBA 128MB
                                                                                
SD Version: 1
SD RCA: 0x5F1A
SD OCR: 0x80FF8000
CID information
    Manufacturer ID: 0x02
    OEM/APP ID: 0x544D
    Product Name: 0x5344313238
    Product Revision: 0x07
    Product Serial Number: 0x665DB60F
    Manufacturing Date: 0x042
CSD: 0x002D0032 0x135983C0 0xF6DA4FFF 0x16400031

                                                                                

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Transcend 2G
                                                                                
SD Version: 1
SD RCA: 0x66D0
SD OCR: 0x80FF8000
CID information
    Manufacturer ID: 0x1B
    OEM/APP ID: 0x534D
    Product Name: 0x5344202020
    Product Revision: 0x10
    Product Serial Number: 0xA110B6F8
    Manufacturing Date: 0x081
CSD: 0x002F0032 0x5F5A83CF 0x2DB7FFBF 0x96800069
                                                                                

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Transcend 2G 150x
                                                                                
SD Version: 2
SD RCA: 0x66D0
SD OCR: 0x80FF8000
CID information
    Manufacturer ID: 0x1C
    OEM/APP ID: 0x5356
    Product Name: 0x5344432020
    Product Revision: 0x10
    Product Serial Number: 0x000000B5
    Manufacturing Date: 0x08B
CSD of the card: 0x005E0032 0x5F5A83D5 0x2DB7FFBF 0x96800085
                                                                                
(從 RCA 來看, 看起來兩張創見應該是用同一顆 Flash controller)
                                                                                
                                                                                

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Apacer 8G SDHC
                                                                                
SD Version: 2
SD RCA: 0x0008
SD OCR: 0xC0FF8000 SDHC card
CID information
    Manufacturer ID: 0x27
    OEM/APP ID: 0x5048
    Product Name: 0x5344303847
    Product Revision: 0x20
    Product Serial Number: 0xE55005E6
    Manufacturing Date: 0x084
CSD: 0x400E0032 0x5B590000 0x3D1B7F80 0x0A40009F

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然後可以來研究怎麼讀寫 Flash
怎麼處理 FAT16/ FAT32
以後程式裡還可以學人家開檔關檔
甚至自己弄個簡單的檔案系統

以後開機, 可以讓 bootloader 自己去讀 script
script會指定要去讀那個檔, 載入到那個位置

有 File System 的話, 好像會更好玩 :D