STM32 small bug summary

   This blog will be updated continuously from time to time , The main purpose is to summarize my daily use STM32 Some strange things encountered in SCM bug, Or more unique precautions , So as not to forget later , It's been adjusted for a long time bug, It turns out that there are some special cases .

Timer

Input capture

HAL The library modifies the polarity of the input capture

1. HAL library When adjusting the polarity of input capture with library function , First reset the last setting , To modify it successfully ：

TIM_RESET_CAPTUREPOLARITY(&htim1,TIM_CHANNEL_1);
TIM_SET_CAPTUREPOLARITY(&htim1,TIM_CHANNEL_1,TIM_INPUTCHANNELPOLARITY_RISING);

3. As shown in the above code , In use TIM_SET_CAPTUREPOLARITY() Function before modifying the polarity of input capture , Use... First TIM_RESET_CAPTUREPOLARITY（） Function to reset the settings , To modify it successfully , Otherwise, it cannot be modified .（ This one is only in STM32F407 Used on a series of single chip computers , I'm not sure whether other series of microcontrollers have this requirement , Of course, it's possible HAL After the library is updated to a certain version, there is no such requirement ）

PWM Output

Standard library initialization configuration TIM1、TIM8 Advanced timer

1. Standard library Initializing the advanced timer TIM1、TIM8 when , Different from initializing a normal timer , You need to call one more function to output normally PWM The signal ：

TIM_CtrlPWMOutputs(TIM8,ENABLE);

2. This one is only in STM32F407 Used on a series of single chip computers , I'm not sure whether other series of microcontrollers have this requirement , Of course, it's possible HAL After the library is updated to a certain version, there is no such requirement