HAL_GPIO_WritePin
HAL_GPIO_EXTI_Callback
HAL_TIM_PWM_Start
HAL_UART_Transmit
HAL_GPIO_ReadPin
HAL_GPIO_EXTI_Callback
HAL_TIM_PWM_Start(&htim3, TIM_CHANNEL_2);
__HAL_TIM_SET_COMPARE(&htim3, TIM_CHANNEL_2, i)
共阳 0xc0, 0xf9, 0xa4, 0xb0, 0x99, 0x92, 0x82, 0xf8, 0x80, 0x90
unit[7] = num / 10000000;
unit[6] = num % 10000000 / 1000000;
unit[5] = num % 1000000 / 100000;
unit[4] = num % 100000 / 10000;
unit[3] = num % 10000 / 1000;
unit[2] = num % 1000 / 100;
unit[1] = num % 100 / 10;
unit[0] = num % 10;