刚接触PIC单片机,现在用dsPIC33系列单片机做一个串口收发测试:采用串口接收中断,大概每隔5ms接收20个字节的数据,并将接收到的数据通过另一个串口转发出去,波特率设的是115200;现在测试时发现串口正常接收发送一段时间后,停止发送,等过一段时间后,又开始接收发送.总是间断性工作,一直查不出是怎么回事,在线仿真,就运行不了.代码如下,请大神帮忙看一下有没有问题,应该如何解决?
#include "P33ep512mc806.h"
// DSPIC33EP512MC806 Configuration Bit Settings
// 'C' source line config statements
/*******系统初始化**********************
将时钟配置为外部高速石英振荡器，其余均采用默认模式。
*************************************/
#define DELAY_76uS asm volatile ("REPEAT, #4201"); Nop();
#define DELAY_8uS asm volatile ("REPEAT, #467"); Nop();
// FGS
#pragma config GWRP = OFF // General Segment Write-Protect bit (General Segment may be written)
#pragma config GSS = OFF // General Segment Code-Protect bit (General Segment Code protect is disabled)
#pragma config GSSK = OFF // General Segment Key bits (General Segment Write Protection and Code Protection is Disabled)
// FOSCSEL
#pragma config FNOSC = PRIPLL // Initial Oscillator Source Selection bits (Primary Oscillator (XT, HS, EC) with PLL)
#pragma config IESO = OFF // Two-speed Oscillator Start-up Enable bit (Start up with user-selected oscillator source)
// FOSC
#pragma config POSCMD = HS // Primary Oscillator Mode Select bits (HS Crystal Oscillator Mode)
#pragma config OSCIOFNC = OFF // 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)
// 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 Wait 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 = ON // Watchdog Timer Enable bit (Watchdog timer always enabled)
// FPOR
#pragma config FPWRT = PWR128 // Power-on Reset Timer Value Select bits (128ms)
#pragma config BOREN = ON // Brown-out Reset (BOR) Detection Enable bit (BOR is enabled)
#pragma config ALTI2C1 = OFF // Alternate I2C pins for I2C1 (SDA1/SCK1 pins are selected as the I/O pins for I2C1)
// FICD
#pragma config ICS = PGD1 // ICD Communication Channel Select bits (Communicate on PGEC1 and PGED1)
#pragma config RSTPRI = PF // Reset Target Vector Select bit (Device will obtain reset instruction from Primary flash)
#pragma config JTAGEN = OFF // JTAG Enable bit (JTAG is disabled)
// FAS
#pragma config AWRP = OFF // Auxiliary Segment Write-protect bit (Aux Flash may be written)
#pragma config APL = OFF // Auxiliary Segment Code-protect bit (Aux Flash Code protect is disabled)
#pragma config APLK = OFF // Auxiliary Segment Key bits (Aux Flash Write Protection and Code Protection is Disabled)
unsigned char flag=0,head=0,head1=0xa5;
//配置PLL，将系统时钟配置为60MHz，外部输入时钟为12MHz。
void System_Colck(void)
{
CLKDIVbits.PLLPRE = 0; //N1 = 2 24/2=12MHz
PLLFBDbits.PLLDIV = 8; //M = 10 12*10=120MHz
CLKDIVbits.PLLPOST = 0; //N2 = 2 120/2 = 60MHz
while (OSCCONbits.COSC!= 0b011)
while (OSCCONbits.LOCK!= 1) {}; //PLL 配置完成
}
/****************UART1_TX初始化***************/
void UART1_TX_Init(void)
{
RPOR2bits.RP68R = 0b000001; //将GPIORP68配置为UART1_TX
U1MODEbits.STSEL = 0; //1个停止位
U1MODEbits.PDSEL = 0; //8位数据，无奇偶校验位
U1MODEbits.ABAUD = 0; //禁止自动调整波特率
U1MODEbits.BRGH = 0; //UART标准模式，每个周期内产生16个时钟信号
U1BRG = ((30000000/115200)/16)-1; //设置波特率为115200
U1STAbits.UTXISEL0 = 0;
U1STAbits.URXISEL1 = 0; //发送中断模式选择，当一个字符被传输到发送移位寄存器时产生中断
IEC0bits.U1TXIE = 1; //使能发送中断
U1MODEbits.UARTEN = 1; //使能UART
U1STAbits.UTXEN = 1; //发送使能
}
/****************UART1_RX初始化***************/
void UART1_RX_Init(void)
{
RPINR18bits.U1RXR = 0b1000101; //将GPIORP65配置为UART1_RX
TRISDbits.TRISD3 = 1; //寄存器映射
U1MODEbits.STSEL = 0; //1个停止位
U1MODEbits.PDSEL = 0; // 8位数据，无奇偶校验位
U1MODEbits.ABAUD = 0; //禁止自动调整波特率
U1MODEbits.BRGH = 0; //UART标准模式，每个周期内产生16个时钟信号
U1BRG = ((30000000/115200)/16)-1; //设置波特率为115200
IEC0bits.U1RXIE = 1; //使能接收中断
IPC2bits.U1RXIP=1;
U1STAbits.URXISEL = 0b00; //接收中断模式选择，接收到任意一个字符产生中断
U1MODEbits.UARTEN = 1; //使能UART
}
/****************UART3_TX初始化***************/
void UART3_TX_Init(void)
{
RPOR7bits.RP97R = 0b011011; //将GPIORP97配置为UART2_TX
U3MODEbits.STSEL = 0; //1个停止位
U3MODEbits.PDSEL = 0; //8位数据，无奇偶校验位
U3MODEbits.ABAUD = 0; //禁止自动调整波特率
U3MODEbits.BRGH = 0; //UART标准模式，每个周期内产生16个时钟信号
U3BRG = ((30000000/115200)/16)-1; //设置波特率为115200
U3STAbits.UTXISEL0 = 0;
U3STAbits.URXISEL1 = 0; //发送中断模式选择，当一个字符被传输到发送移位寄存器时产生中断
IEC5bits.U3TXIE = 1; //使能发送中断
U3MODEbits.UARTEN = 1; //使能UART
U3STAbits.UTXEN = 1; //发送使能
}
/****************UART3_RX初始化***************/
void UART3_RX_Init(void)
{
RPINR27bits.U3RXR = 0b1100000; //将GPIORP96配置为UAR3_RX
TRISFbits.TRISF0 = 1; //寄存器映射
U3MODEbits.STSEL = 0; //1个停止位
U3MODEbits.PDSEL = 0; // 8位数据，无奇偶校验位
U3MODEbits.ABAUD = 0; // 禁止自动调整波特率
U3MODEbits.BRGH = 0; //UART标准模式，每个周期内产生16个时钟信号
U3BRG = ((30000000/115200)/16)-1; //设置波特率为115200
U3STAbits.URXISEL = 0b00; //接收中断模式选择，接收到任意一个字符产生中断
IEC5bits.U3RXIE = 1; //使能接收中断
U3MODEbits.UARTEN = 1; //使能UART
}
int main()
{
System_Colck(); //时钟初始化
System_Init(); //系统初始化
UART1_RX_Init(); //UART1_RX初始化
UART1_TX_Init(); //UART1_TX初始化
UART3_RX_Init(); //UART3_RX初始化
UART3_TX_Init(); //ART3_TX初始化
IFS0bits.U1RXIF = 0;
while(1)
{
//UART1_TX_Init();
//DELAY_76uS;
//U1TXREG = head1;
}
}
void __attribute__((__interrupt__, auto_psv)) _U1TXInterrupt(void)//UART1发送中断
{
IFS0bits.U1TXIF = 0;
}
void __attribute__((__interrupt__, auto_psv)) _U1RXInterrupt(void)//UART1接收中断
{
//UART1_RX_Init();
if(U1STAbits.OERR == 1)
{
U1STAbits.OERR = 0;
}
while(U1STAbits.URXDA ==1)
{
head=U1RXREG;
U3TXREG = head;
}
IFS0bits.U1RXIF = 0;
}
void __attribute__((__interrupt__, auto_psv)) _U3TXInterrupt(void)////UART3发送中断
{
IFS5bits.U3TXIF = 0;
}
void __attribute__((__interrupt__, auto_psv)) _U3RXInterrupt(void)//UART3接收中断
{
IFS5bits.U3RXIF = 0;
}
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