TIM2_CCMR1 |= 0x70; /* Output mode PWM2. */
TIM2_CCER1 |= 0x03; /* CC polarity low,enable PWM output */
TIM2_ARR = ***; // Freq control register: ARR ----设置该值使输出频率为10K
TIM2_CCR1 = AA1; // Dutycycle control register: CCR1 ----- 通道1的占空比
TIM2_CCR1 = AA2; // Dutycycle control register: CCR2 ----- 通道2的占空比
TIM2_PSCR |= 0x00; // fCK_CNT is equal to fCK_PSC.
TIM2_CR1 |= 0x01; // Enable TIM2.
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