器件PIC18F67k40 UART接收器部分工作正常，但发送器部分不工作？ UART接收器部分正常工作。谁能建议我在下面的代码中我做错了什么。 设备速度为16Mhz，波特率为115200 器件PIC18F67k40 UART接收器部分工作正常，但发送器部分不工作？ UART接收器部分正常工作。谁能建议我在下面的代码中我做错了什么。 设备速度为16Mhz，波特率为115200
#include <xc.h>
#include <p18f67k40.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// PIC18F67K40 Configuration Bit Settings
// 'C' source line config statements
// CONFIG1L
#pragma config FEXTOSC = HS // External Oscillator mode Selection bits (Oscillator not enabled)
#pragma config RSTOSC = HFINTOSC_64MHZ// Power-up default value for COSC bits (HFINTOSC with HFFRQ = 64 MHz and CDIV = 1:1)
// CONFIG1H
#pragma config CLKOUTEN = OFF // Clock Out Enable bit (CLKOUT function is disabled)
#pragma config CSWEN = ON // Clock Switch Enable bit (Writing to NOSC and NDIV is allowed)
#pragma config FCMEN = ON // Fail-Safe Clock Monitor Enable bit (Fail-Safe Clock Monitor enabled)
// CONFIG2L
#pragma config MCLRE = EXTMCLR // Master Clear Enable bit (If LVP = 0, MCLR pin is MCLR; If LVP = 1, RG5 pin function is MCLR )
#pragma config PWRTE = OFF // Power-up Timer Enable bit (Power up timer disabled)
#pragma config LPBOREN = OFF // Low-power BOR enable bit (ULPBOR disabled)
#pragma config BOREN = SBORDIS // Brown-out Reset Enable bits (Brown-out Reset enabled , SBOREN bit is ignored)
// CONFIG2H
#pragma config BORV = VBOR_2P45 // Brown Out Reset Voltage selection bits (Brown-out Reset Voltage (VBOR) set to 2.45V)
#pragma config ZCD = OFF // ZCD Disable bit (ZCD disabled. ZCD can be enabled by setting the ZCDSEN bit of ZCDCON)
#pragma config PPS1WAY = ON // PPSLOCK bit One-Way Set Enable bit (PPSLOCK bit can be cleared and set only once; PPS registers remain locked after one clear/set cycle)
#pragma config STVREN = ON // Stack Full/Underflow Reset Enable bit (Stack full/underflow will cause Reset)
#pragma config DEBUG = OFF // Debugger Enable bit (Background debugger disabled)
#pragma config XINST = OFF // Extended Instruction Set Enable bit (Extended Instruction Set and Indexed Addressing Mode disabled)
// CONFIG3L
#pragma config WDTCPS = WDTCPS_31// WDT Period Select bits (Divider ratio 1:65536; software control of WDTPS)
#pragma config WDTE = OFF // WDT operating mode (WDT Disabled)
// CONFIG3H
#pragma config WDTCWS = WDTCWS_7// WDT Window Select bits (window always open (100%); software control; keyed access not required)
#pragma config WDTCCS = SC // WDT input clock selector (Software Control)
// CONFIG4L
#pragma config WRT0 = OFF // Write Protection Block 0 (Block 0 (000800-003FFFh) not write-protected)
#pragma config WRT1 = OFF // Write Protection Block 1 (Block 1 (004000-007FFFh) not write-protected)
#pragma config WRT2 = OFF // Write Protection Block 2 (Block 2 (008000-00BFFFh) not write-protected)
#pragma config WRT3 = OFF // Write Protection Block 3 (Block 3 (00C000-00FFFFh) not write-protected)
#pragma config WRT4 = OFF // Write Protection Block 3 (Block 4 (010000-013FFFh) not write-protected)
#pragma config WRT5 = OFF // Write Protection Block 3 (Block 5 (014000-017FFFh) not write-protected)
#pragma config WRT6 = OFF // Write Protection Block 3 (Block 6 (018000-01BFFFh) not write-protected)
#pragma config WRT7 = OFF // Write Protection Block 3 (Block 7 (01C000-01FFFFh) not write-protected)
// CONFIG4H
#pragma config WRTC = OFF // Configuration Register Write Protection bit (Configuration registers (300000-30000Bh) not write-protected)
#pragma config WRTB = OFF // Boot Block Write Protection bit (Boot Block (000000-0007FFh) not write-protected)
#pragma config WRTD = OFF // Data EEPROM Write Protection bit (Data EEPROM not write-protected)
#pragma config SCANE = ON // Scanner Enable bit (Scanner module is available for use, SCANMD bit can control the module)
#pragma config LVP = ON // Low Voltage Programming Enable bit (Low voltage programming enabled. MCLR/VPP pin function is MCLR. MCLRE configuration bit is ignored)
// CONFIG5L
#pragma config CP = OFF // UserNVM Program Memory Code Protection bit (UserNVM code protection disabled)
#pragma config CPD = OFF // DataNVM Memory Code Protection bit (DataNVM code protection disabled)
// CONFIG5H
// CONFIG6L
#pragma config EBTR0 = OFF // Table Read Protection Block 0 (Block 0 (000800-003FFFh) not protected from table reads executed in other blocks)
#pragma config EBTR1 = OFF // Table Read Protection Block 1 (Block 1 (004000-007FFFh) not protected from table reads executed in other blocks)
#pragma config EBTR2 = OFF // Table Read Protection Block 2 (Block 2 (008000-00BFFFh) not protected from table reads executed in other blocks)
#pragma config EBTR3 = OFF // Table Read Protection Block 3 (Block 3 (00C000-00FFFFh) not protected from table reads executed in other blocks)
#pragma config EBTR4 = OFF // Table Read Protection Block 4 (Block 4 (010000-013FFFh) not protected from table reads executed in other blocks)
#pragma config EBTR5 = OFF // Table Read Protection Block 5 (Block 5 (014000-017FFFh) not protected from table reads executed in other blocks)
#pragma config EBTR6 = OFF // Table Read Protection Block 6 (Block 6 (018000-01BFFFh) not protected from table reads executed in other blocks)
#pragma config EBTR7 = OFF // Table Read Protection Block 7 (Block 7 (01C000-01FFFFh) not protected from table reads executed in other blocks)
// CONFIG6H
#pragma config EBTRB = OFF // Boot Block Table Read Protection bit (Boot Block (000000-0007FFh) not protected from table reads executed in other blocks)
// #pragma config statements should precede project file includes.
// Use project enums instead of #define for ON and OFF.
#define _XTAL_FREQ 16000000 //16Mhz
#define LED2 RC2 //LED2
char string_rx1[100],uart_rx1=0,string_rx2[100],uart_rx2=0,str2=0;
void System_Init() // System_Init
{
OSCFRQ=0b00000101; //16Mhz
TRISC2=0;//LED2 Pin-33 Output
INTCONbits.GIE=1;
INTCONbits.PEIE=1;
INTCONbits.IPEN=1;
}
void UART_2_Init()//UART_2_Init()
{
TRISGbits.TRISG1=1; // TX2 Pin-4
TRISGbits.TRISG2=1; // RX2 Pin-5
RX2PPS=0b00110010;
TX2PPS=0b00110001;
RC2IE=1;
SP2BRG=34; // Baud Rate 115200
BAUD2CON = 0x08; // ABDOVF no_overflow; SCKP Non-Inverted; BRG16 16bit_generator; WUE disabled; ABDEN disabled;
//TX2STA Register
TX2STAbits.CSRC=0; // Asynchronous mode:Don?t care bit-7
TX2STAbits.TX9=1; // 8-bit transmission bit-6
TX2STAbits.TXEN=0; // Transmit is Disabled bit-5
TX2STAbits.TXEN=1; // Transmit is enabled bit-5
TX2STAbits.SYNC=0; // Asynchronous mode bit-4
TX2STAbits.SENDB=1; // Sync Break transmission disabled or completed bit-3
TX2STAbits.BRGH=1; // High Baud Rate Select bit bit-2
TX2STAbits.TRMT=1; // Transmit Shift Register Status bit bit-1
TX2STAbits.TX9D=1; // Ninth bit of Transmit Data bit-0
//RX2STA Register
RC2STAbits.SPEN=1; // Serial Port Enable bit bit-7
RC2STAbits.RX9=0; // 8-bit reception bit-6
RC2STAbits.SREN=0; // Single Receive Enable bit Asynchronous mode:Don?t care bit-5
RC2STAbits.CREN=1; // Continuous Receive Enable bit bit-4
RC2STAbits.ADDEN=0; // bit-3
ANSELGbits.ANSELG1=0; //
ANSELGbits.ANSELG2=0;//
RC2IP = 1;//
TX2IP = 1;//
}
void UART_2_Tx(unsigned char z[]) //UART_2_Tx
{
unsigned int uart_tx2=0;
while(z[uart_tx2]!='\0')
{
while(!TX2IF);
TX2REG=z[uart_tx2];
uart_tx2++;
}
}
void UART_Tx2(const char *buffer) // UART2 Transmmitr
{
unsigned int size = strlen(buffer);
while( size)
{
while(TX2IF==0); // wait while TX buffer full
TX2REG = *buffer; // send single character to transmit buffer
buffer++; // transmit next character on following loop
size--; // loop until all characters sent (when size = 0)
}
while( !TX2STAbits.TRMT); // wait for last transmission to finish
}
void UART_2_Rx()//UART_2_Rx
{
string_rx2[uart_rx2]=RC2REG;
uart_rx2++;
}
void interrupt ISR(void) //interrupt ISR
{
if(RC2IF && RC2IE) // Through Application UART_2
{
UART_2_Rx();
if(RC2STAbits.OERR){RC2STAbits.CREN=0;RC2STAbits.CREN=1;}
str2=1;
}
}
void main(void) // main
{
System_Init();
UART_2_Init();
UART_2_Tx("HELLO\r\n"); //1st transmitter logic
UART_Tx2("HELLO\r\n"); //2nd transmitter logic
LED2=0;
while(1)
{
if(string_rx2[0]=='1'){LED2=1;__delay_ms(10);string_rx2[0]='\0';uart_rx2=0;}
if(string_rx2[0]=='0'){LED2=0;__delay_ms(10);string_rx2[0]='\0';uart_rx2=0;}
if(str2){str2=0;__delay_ms(20);uart_rx2=0;}
}
}
答案 0 :(得分：1)
TX引脚应为输出。因此使用：
TRISGbits.TRISG1=0; // TX2 Pin-4
请记住PPS寄存器。 RG1不是接收器的默认值。
RG1PPS = 0x14 //for UART Nr.5
请查看数据表中的第17节。