syscall报错

如

undefined reference to `_sbrk'
undefined reference to `_close'
undefined reference to `_lseek'
undefined reference to `_read'
undefined reference to `_fstat'
undefined reference to `_isatty'

勾选不使用syscall

进入DefaulrISR的原因

1、FTUn_IRQHandler参数错误 2、数组溢出，如需初始化10个外设时钟，而数组大小只有9

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