I used STM32F103C8 series of chips, now I design four keys, the corresponding IOs is PC13,PC14,PC15 and PB11. The problem is that PC15 and PB11 cannot be used as input at the same time.As long as these two pins are not input at the same time, the rest of the keys are normal.If both pins are enabled at the same time, PC15 will not work properly.All of these IOs are in Pull-Up Input Mode. The data manual does not describe that PC15 and PB11 are in conflict when they are input at the same time. I am confused.
In addition, during initialization, the JTAG pin is disabled.Gentlemen or engineers, please help me answer this question, thank you very much.
