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tim4 TIMER3的timeb 在pf7脚输出pwm问题



新人小白,按照网上找的程序修改了一下,发现pf7脚始终没有波形,据说要解锁引脚什么的,有没有使用tiva库实现过类似功能的朋友,求发个参考的代码!