我编写了UART通信代码。TX 工作正常，但 RX 不工作。我搜索了很多，但没有找到解决方案。
我正在以时间间隔将字符 x 传输到 PC，并且我能够看到数据。但是当传输数据图片时没有收到任何东西。
下面是用于uart
//PGEC1/AN4/C1IN1+/RPI34/RB2 for receiver
RPINR18bits.U1RXR = 34;
//RP36/RB4 for transmitting data
RPOR1bits.RP36R = 1;
我可以将数据传输到电脑，但 PIC 没有从电脑接收任何字符。提前致谢
这是我的代码。DSPIC33EP128MC202
/*
* File: newmainXC16.c
* Author:
*
* Created on 27 December, 2017, 4:21 PM
*/
// FICD
#pragma config ICS = PGD3 // ICD Communication Channel Select bits (Communicate on PGEC3 and PGED3)
#pragma config JTAGEN = OFF // JTAG Enable bit (JTAG is disabled)
// FPOR
#pragma config ALTI2C1 = OFF // Alternate I2C1 pins (I2C1 mapped to SDA1/SCL1 pins)
#pragma config ALTI2C2 = OFF // Alternate I2C2 pins (I2C2 mapped to SDA2/SCL2 pins)
#pragma config WDTWIN = WIN25 // Watchdog Window Select bits (WDT Window is 25% of WDT period)
// FWDT
#pragma config WDTPOST = PS32768 // Watchdog Timer Postscaler bits (1:32,768)
#pragma config WDTPRE = PR128 // Watchdog Timer Prescaler bit (1:128)
#pragma config PLLKEN = ON // PLL Lock Enable bit (Clock switch to PLL source will wait until the PLL lock signal is valid.)
#pragma config WINDIS = OFF // Watchdog Timer Window Enable bit (Watchdog Timer in Non-Window mode)
#pragma config FWDTEN = OFF // Watchdog Timer Enable bit (Watchdog timer enabled/disabled by user software)
// FOSC
#pragma config POSCMD = NONE // Primary Oscillator Mode Select bits (Primary Oscillator disabled)
#pragma config OSCIOFNC = ON // OSC2 Pin Function bit (OSC2 is clock output)
#pragma config IOL1WAY = ON // Peripheral pin select configuration (Allow only one reconfiguration)
#pragma config FCKSM = CSDCMD // Clock Switching Mode bits (Both Clock switching and Fail-safe Clock Monitor are disabled)
// FOSCSEL
#pragma config FNOSC = FRCPLL // Oscillator Source Selection (Fast RC Oscillator with divide-by-N with PLL module (FRCPLL) )
#pragma config PWMLOCK = ON // PWM Lock Enable bit (Certain PWM registers may only be written after key sequence)
#pragma config IESO = ON // Two-speed Oscillator Start-up Enable bit (Start up device with FRC, then switch to user-selected oscillator source)
// FGS
#pragma config GWRP = OFF // General Segment Write-Protect bit (General Segment may be written)
#pragma config GCP = OFF // General Segment Code-Protect bit (General Segment Code protect is Disabled)
#include "xc.h"
#include <stdint.h>
#include <p33EP128MC202.h>
#define FP 60000000
#define BAUDRATE 115200
#define BRGVAL ((FP/BAUDRATE)/16)-1
#define DELAY_100uS asm volatile ("REPEAT, #5400"); Nop(); // 100uS delay
int main(void)
{
uint8_t c;
int i,j,a,b;
// Configure Oscillator to operate the device at 60Mhz
// Fosc= Fin*M/(N1*N2), Fcy=Fosc/2
// Fosc= 8M*60/(2*2)=120Mhz for 8M input clock == 8*60/4 = 120/2 = 60
CLKDIVbits.PLLPOST=0; // PLLPOST (N1) 0=/2
while(!OSCCONbits.LOCK); // wait for PLL ready
PLLFBD = 58; // M=60
CLKDIVbits.PLLPOST = 0; // N1=2
CLKDIVbits.PLLPRE = 0; // N2=2
OSCTUN = 0; // Tune FRC oscillator, if FRC is used
/*Initialize the Ports */
TRISA = 0x00;
LATA = 0x0000;
PORTA = 0x0000;
ANSELAbits.ANSA1 = 0;
ANSELAbits.ANSA0 = 0;
__builtin_write_OSCCONL(OSCCON & ~(1<<6));
RPINR18bits.U1RXR = 34;
RPOR1bits.RP36R = 1;
__builtin_write_OSCCONL(OSCCON | (1<<6));
U1MODEbits.STSEL = 0;
U1MODEbits.PDSEL = 0;
U1MODEbits.ABAUD = 0;
U1MODEbits.BRGH = 0;
U1BRG = 30;
U1MODEbits.UARTEN = 1;
IEC0bits.U1TXIE = 0;
U1STAbits.UTXEN = 1;
U1STAbits.URXISEL = 0;
DELAY_100uS;
DELAY_100uS;
DELAY_100uS;
U1TXREG = 'X';
char ReceivedChar;
while(1){
//If data is received send data to TX
if(U1STAbits.URXDA == 1) {
ReceivedChar = U1RXREG + 2;
U1TXREG = 10;
U1TXREG = 13;
}
for(i=0;i<1000;i++){
a = a + 1;
for(j=0;j<2000;j++){
b = b + 1;
}
}
//LED Blink code for programme check
if(c == 0){
c = 1;
}else{
c = 0;
}
LATAbits.LATA0 = c;
LATAbits.LATA1 = c;
U1TXREG = 'x';
U1TXREG = 10;
U1TXREG = 13;
}
}
void __attribute__((interrupt, no_auto_psv)) _U1TXInterrupt( void )
{
IFS0bits.U1TXIF = 0; // Clear TX Interrupt flag
}
void __attribute__((interrupt, no_auto_psv)) _U1RXInterrupt( void )
{
IFS0bits.U1RXIF = 0; // Clear RX Interrupt flag
//cntr++;
U1TXREG='a';
U1TXREG = 10;
U1TXREG = 13;
}