In the RM0090 TIM2-TIM5 describes master / slave. Is TRGO1 always only from TIM_CHANNEL_1? I'm not able to get the simple example in Figure 174 for timer acting as a prescaler to work.
Don't hijack others threads. Start your own, stating the STM32 and hardware you are using, and the problem you came across. You can link to this thread if you think it's relevant.
