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28335 SCI boot 必须要选择SCI-A吗？

Troublemaker
Expert 2117 points

如果必须要选择用SCIATXD和SCIARXD，那么外扩512K RAM时XA19就用不了了！！！

请问有什么方法解决吗？用SCI-B可以吗？

  • 0
    Guru 56631 points

    datasheet上有
    Table 3-6. Boot Mode Selection
    MODE GPIO87/XA15 GPIO86/XA14 GPIO85/XA13 GPIO84/XA12 MODE(1)
    F 1 1 1 1 Jump to Flash
    E 1 1 1 0 SCI-A boot
    D 1 1 0 1 SPI-A boot
    C 1 1 0 0 I2C-A boot
    B 1 0 1 1 eCAN-A boot
    A 1 0 1 0 McBSP-A boot
    9 1 0 0 1 Jump to XINTF x16
    8 1 0 0 0 Jump to XINTF x32
    7 0 1 1 1 Jumpto OTP
    6 0 1 1 0 Parallel GPIO I/O boot
    5 0 1 0 1 Parallel XINTF boot
    4 0 1 0 0 Jump to SARAM
    3 0 0 1 1 Branch to check boot mode
    2 0 0 1 0 Branch to Flash, skip ADC calibration
    1 0 0 0 1 Branch to SARAM, skip ADC calibration
    0 0 0 0 0 Branch to SCI, skip ADC calibration

  • 0 回复 mangui zhang
    Expert 2117 points

    我设计时用的SCI-A串口烧写方式。DSP28335有两个SCIA模块。其中一个SCIA由GPIO28（XA19）和GPIO29（XZCS6）组成，但是在外扩RAM时被占用了。另一个SCIA由GPIO62，GPIO63组成。SCI boot上面写着由GPIO28和GPIO29来实现。不知道由GPIO62和GPIO63来实现，可不可以？

    谢谢！