RPI119分配UART RX不成功

大家好，我用DSSPICEP512MC806从传感器收集数据，并通过UART端口发送到PC。同时，我还添加了一个功能，可以从我的PC接收命令，以开始转换或终止转换等。这是我的问题：首先，我指派UART RX到PINα5：C1IN -/SDI2/PMA4/RPI119/RG7，通过：但是我的UART模块从来没有收到任何东西。然后，我将RX功能分配给PINα2：AN30/PWM4L/PMD6/RPI86/Re6，通过：它工作！我对此感到困惑，我更喜欢用PIN×5代替PIN 2，任何帮助都会很棒！谢谢！



      以下为原文

    Hi guys,
I am using dsPIC33EP512MC806 to collect some data from sensor and send them to PC through UART port. Meanwhile, I also adding a functionality that can receive command from my PC to either start conversion or terminate conversion etc.
Here is my question: firstly, I assign UART RX to pin#5: C1IN1-/SDI2/PMA4/RPI119/RG7, by:
RPINR18bits.U1RXR = 0b1110111; // Assign U1RX to RPI119
but my UART module never receive anything. Then I assign RX functionality to pin#2: AN30/PWM4L/PMD6/RPI86/RE6, by:
ANSELEbits.ANSE6 = 0;
RPINR18bits.U1RXR = 0b1010110;
and it works! I am so confused about this, and I prefer to use pin#5 instead of pin#2, any help would be great! Thanks!