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可以用定时器定时去toggle GPIO管脚。但是GPIO管脚翻转的速度有限制，脉宽是2个SYSCLK4（1.3v时114MHz）（Table 6-5. Maximum Internal Clock Frequencies at Each Voltage Operating Point） Figure 6-86. GPIO Port Timing https://www.ti.com/lit/ds/symlink/tms320c6748.pdf
