我先建議用示波器看一下 RxD1 (RP1) 這隻腳是否有訊號進來?

我用24HJ128GP502作UART傳輸,TX有輸出,但是用電腦終端機送出Data,RX都收不到資料也跳不進去中斷,但是設定成Loopback時,TX丟出資料時,RX就可以進中斷也收的到資料,請問是哪邊設定有錯

這是我的程式

int main(void)
{
Initialize_PPS();
Initialize_UART();
while(1)
{
ClrWdt();

}
}


//PPS設定
void Initialize_PPS(void)
{
PPSUnLock; //Unlock the PPS lock feature
iPPSOutput(OUT_PIN_PPS_RP0,OUT_FN_PPS_U1TX); //Uart1 Tx
iPPSInput(IN_FN_PPS_U1RX,IN_PIN_PPS_RP1); //Uart1 Rx
iPPSOutput(OUT_PIN_PPS_RP4,OUT_FN_PPS_U2TX); //Uart2 Tx
iPPSOutput(OUT_PIN_PPS_RP3,OUT_FN_PPS_OC1); //PWM
iPPSOutput(OUT_PIN_PPS_RP15,OUT_FN_PPS_C1TX); //ECAN1 Tx
iPPSInput(IN_FN_PPS_C1RX,IN_PIN_PPS_RP14); //ECAN1 Rx
PPSLock;
}

//UART 設定
void Initialize_UART(void)
{
UINT16 UxMODEvalue,UxSTAvalue;
CloseUART1();
ConfigIntUART1(UART_RX_INT_EN & UART_RX_INT_PR5 & UART_TX_INT_EN & UART_TX_INT_PR2);
UxMODEvalue = UART_EN & UART_IDLE_CON & UART_IrDA_DISABLE & \
UART_MODE_SIMPLEX & UART_UEN_00 & UART_DIS_WAKE & \
UART_DIS_LOOPBACK & UART_DIS_ABAUD & UART_UXRX_IDLE_ONE & \
UART_BRGH_FOUR & UART_NO_PAR_8BIT & UART_1STOPBIT;

UxSTAvalue = UART_INT_TX_BUF_EMPTY & UART_IrDA_POL_INV_ZERO & UART_SYNC_BREAK_DISABLED & \
UART_TX_ENABLE & UART_INT_RX_CHAR & UART_ADR_DETECT_DIS & \
UART_RX_OVERRUN_CLEAR;

OpenUART1(UxMODEvalue,UxSTAvalue,51); //38400 FCY=FOSC/2
/*UxBRG = ( (FCY/Desired Baud Rate)/4)-1
EX:((8MHz/38400)/4)-1=25
*/

CloseUART2();
ConfigIntUART2(UART_RX_INT_DIS & UART_RX_INT_PR0 & UART_TX_INT_EN & UART_TX_INT_PR2);

UxMODEvalue = UART_EN & UART_IDLE_CON & UART_IrDA_DISABLE & \
UART_MODE_SIMPLEX & UART_UEN_00 & UART_DIS_WAKE & \
UART_DIS_LOOPBACK & UART_EN_ABAUD & UART_UXRX_IDLE_ONE & \
UART_BRGH_SIXTEEN & UART_NO_PAR_8BIT & UART_1STOPBIT;

UxSTAvalue = UART_INT_TX_LAST_CH & UART_IrDA_POL_INV_ZERO & UART_SYNC_BREAK_DISABLED & \
UART_TX_ENABLE & UART_INT_RX_CHAR &UART_ADR_DETECT_DIS & \
UART_RX_OVERRUN_CLEAR;
OpenUART2(UxMODEvalue,UxSTAvalue,51); //9600
/*UxBRG = ( (FCY/Desired Baud Rate)/16)-1
EX:((8MHz/9600)/16)-1=51
*/
}


//UART RX中斷
void __attribute__((interrupt,no_auto_psv)) _U1RXInterrupt(void)
{
unsigned char Key_code;
IFS0bits.U1RXIF = 0;
Key_code = ReadUART1();
}