本帖最后由 土司Apple 于 2017-11-13 14:40 编辑
请问楼主：现在把STM32timer3配置成TI1双边沿计数
sConfig.EncoderMode = TIM_ENCODERMODE_TI1;
sConfig.IC1Polarity = TIM_ICPOLARITY_BOTHEDGE;
sConfig.IC1Selection = TIM_ICSELECTION_DIRECTTI;
sConfig.IC1Prescaler = TIM_ICPSC_DIV1;
sConfig.IC1Filter = 0;
sConfig.IC2Polarity = TIM_ICPOLARITY_BOTHEDGE;
sConfig.IC2Selection = TIM_ICSELECTION_DIRECTTI;
sConfig.IC2Prescaler = TIM_ICPSC_DIV1;
sConfig.IC2Filter = 0;
这么配置有个现象一开机电机不转，但是编码器会开始计数，让电机转动一下，然后清零计数器，就好了。这是为啥？
其他的方式配置编码器计数方向会不准（TI12一起双边沿计数，开机之后计数防线快跟所测编码器波形指示的方向不同），再有f407参考手册里面
CC1 channel configured as input:
CC1NP/CC1P bits select the active polarity of TI1FP1 and TI2FP1 for trigger or capture
operations.
00: non-inverted/rising edge
The circuit is sensitive to TIxFP1 rising edge (capture or trigger operations in reset, external
clock or trigger mode), TIxFP1 is not inverted (trigger operation in gated mode or encoder
mode).
01: inverted/falling edge
The circuit is sensitive to TIxFP1 falling edge (capture or trigger operations in reset, external
clock or trigger mode), TIxFP1 is inverted (trigger operation in gated mode or encoder
mode).
10: reserved, do not use this configuration.
11: non-inverted/both edges
The circuit is sensitive to both TIxFP1 rising and falling edges (capture or trigger operations
in reset, external clock or trigger mode), TIxFP1 is not inverted (trigger operation in gated
mode). This configuration must not be used in encoder mode（这一句话意思跟设置成双边沿计数的方式是否矛盾？）
多谢多谢，盼望楼主慷慨解答。
stm32/stm8