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#紧急求教#TM4C123GH6PZ部分引脚输入异常

如图,SN74LVC4245 5V输入,3.3V输出直接到MCU,MCU配置如下:

  ROM_GPIOPinTypeGPIOInput(SIGNAL_IN1_PORT, SIGNAL_IN1_PIN);
  ROM_GPIOPinTypeGPIOInput(SIGNAL_IN2_PORT, SIGNAL_IN2_PIN);
  ROM_GPIOPinTypeGPIOInput(SIGNAL_IN3_PORT, SIGNAL_IN3_PIN);
  ROM_GPIOPinTypeGPIOInput(SIGNAL_IN4_PORT, SIGNAL_IN4_PIN);
  ROM_GPIOPinTypeGPIOInput(SIGNAL_IN5_PORT, SIGNAL_IN5_PIN);
  ROM_GPIOPinTypeGPIOInput(SIGNAL_IN6_PORT, SIGNAL_IN6_PIN);
  ROM_GPIOPinTypeGPIOInput(SIGNAL_IN7_PORT, SIGNAL_IN7_PIN);
  ROM_GPIOPinTypeGPIOInput(SIGNAL_IN8_PORT, SIGNAL_IN8_PIN);
当输入端一直为5V时,芯片读取到的信号刚开始正常,过半天(时间不固定)后读出来的信号就成了低,用示波器测单片机引脚的电平
为1V,此时MCU跟电平转换芯片都很烫,供电电压都正常,发生这种情况后,将5V端变为0V或MCU上电重新启动才能恢复正常,短接MCU的复位引脚重启系统后问题依然存在。(涉及到的引脚有PH0/PF4)