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MSP432串口接收问题

在使用MSP432接收触摸屏的发送来的语句时,只能接收到最后一位,其余位丢失。

请问单片机触发接收中断的条件是什么?如何保证每一位都能接到

屏幕初始化结束后发回串口'OK',只能接收到'K'

继续触摸按键1 屏幕应该发送回'[BN:1]\r\n'但是串口没有反应