选择哪个核控制 GPIO 应该是 GPIOCSEL 寄存器，而不是 GPIOAPSEL 寄存器。
关于 GPIOAPSEL 寄存器的描述应该是这个样子：
4.1.6.18 GPIO Alternate Peripheral Select (GPIOAPSEL) Register, offset 0x530
The GPIOAPSEL register is used to access the M3 GPIO alternate peripheral muxing options. When
these bits are set, values of 0x0 - 0xF are valid values in the GPIOPCTL PMCx bit fields. See Table 4-1
for alternate muxing options.
选择哪个核控制 GPIO 应该是 GPIOCSEL 寄存器，而不是 GPIOAPSEL 寄存器。
关于 GPIOAPSEL 寄存器的描述应该是这个样子：
4.1.6.18 GPIO Alternate Peripheral Select (GPIOAPSEL) Register, offset 0x530
The GPIOAPSEL register is used to access the M3 GPIO alternate peripheral muxing options. When
these bits are set, values of 0x0 - 0xF are valid values in the GPIOPCTL PMCx bit fields. See Table 4-1
for alternate muxing options.
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