45 int tq_set_pwm(
int node,
unsigned long period,
unsigned long duty_cycle);
int tq_pwm_test()
测试pwm_enable()和tq_set_pwm()这两个函数
int pwm_enable(int node, int enable)
PWM 开启/关闭
int tq_set_pwm(int node, unsigned long period, unsigned long duty_cycle)
设置 PWM 的周期、占空比