/*
PIC18F4550串口一直出现发送的数据跟接收到的数据不一致，例如串口调试组手发送0X30,MCU接收到是0XD8;MCU发送0X31，串口调试组手接收0X61。
困扰很久，不知道问题出在哪，麻烦各位大师帮忙解答一下，谢谢！
*/
/*
编译器：MCC18
版本：MPLAB-C18-v3_02
晶振：20MHZ
*/
#include <p18cxxx.h>
#include <delays.h>
#include <usart.h>
/****** CONFIG1L Options ********************************************/
#pragma config PLLDIV = 5 //5 分频（20 MHz 振荡器输入）
#pragma config CPUDIV = OSC4_PLL6 //96 MHz PLL 6 分频作为系统时钟
#pragma config USBDIV = 2
/****** CONFIG1H Options ********************************************/
#pragma config FOSC = HSPLL_HS //HS振荡器，使能PLL （HSPLL）
#pragma config FCMEN = ON
#pragma config IESO = ON
/****** CONFIG2L Options ********************************************/
#pragma config PWRT = ON
#pragma config BOR = ON
#pragma config BORV = 3
#pragma config VREGEN = ON
/****** CONFIG2H Options ********************************************/
#pragma config WDT = OFF
#pragma config WDTPS = 32768
/****** CONFIG3H Options ********************************************/
#pragma config MCLRE = OFF
#pragma config LPT1OSC = ON
#pragma config PBADEN = OFF
#pragma config CCP2MX = ON
/****** CONFIG4L Options ********************************************/
#pragma config STVREN = ON
#pragma config LVP = OFF
#pragma config ICPRT = OFF
#pragma config XINST = OFF
/****** CONFIG5L Options ********************************************/
#pragma config CP0 = OFF
#pragma config CP1 = OFF
#pragma config CP2 = OFF
#pragma config CP3 = OFF
/****** CONFIG5H Options ********************************************/
#pragma config CPB = OFF
#pragma config CPD = OFF
/****** CONFIG6L Options ********************************************/
#pragma config WRT0 = ON
#pragma config WRT1 = ON
#pragma config WRT2 = ON
#pragma config WRT3 = ON
/****** CONFIG6H Options ********************************************/
#pragma config WRTB = ON
#pragma config WRTC = ON
#pragma config WRTD = OFF
/****** CONFIG7L Options ********************************************/
#pragma config EBTR0 = OFF
#pragma config EBTR1 = OFF
#pragma config EBTR2 = OFF
#pragma config EBTR3 = OFF
/****** CONFIG7H Options ********************************************/
#pragma config EBTRB = OFF
#define uchar unsigned char
#define uint unsigned int
//---------主函数定义区---------
void InitializeSystem(void);//系统初始化
void UserInit(void); //用户初始化程序
void USARTInit(void); //USART初始化程序
void InterruptHandlerHigh (void);//高优先级中断服务函数
void InterruptHandlerLow (void);//低优先级中断服务函数
//定义输出
#define LED RA1 //LED
//定义变量
unsigned int count_timer2;
unsigned char timer2_flag;
unsigned char flag_rx,flag_tx;
uchar recive;
//中断函数
// High priority interrupt vector
#pragma code InterruptVectorHigh = 0x08
void
InterruptVectorHigh (void)
{
_asm
goto InterruptHandlerHigh //jump to interrupt routine
_endasm
}
#pragma code InterruptVectorLow = 0x18
InterruptVectorLow (void)
{
_asm
goto InterruptHandlerLow //jump to interrupt routine
_endasm
}
#pragma code
//低优先级中断
#pragma interruptlow InterruptHandlerLow
void InterruptHandlerLow ()
{
if(PIR1bits.TMR2IF)
{ //check for TMR2 overflow
PIR1bits.TMR2IF = 0; //clear interrupt flag
timer2_flag = 1; //indicate timeout
if(++count_timer2>500)
{
LATAbits.LATA1 = !LATAbits.LATA1; //toggle LED on RA1
count_timer2=0;
}
}
}
//高优先级中断
#pragma interrupt InterruptHandlerHigh
void InterruptHandlerHigh ()
{
if (PIR1bits.RCIF)
{ //check for TMR2 overflow
PIR1bits.RCIF = 0; //clear interrupt flag
/* Get the character received from the USART */
recive =RCREG; // ReadUSART();
if (recive >= 0x30 && recive <= 0x39)
{
flag_rx=1;
}
else
{
flag_tx=1;
}
}
}
//主函数
void main (void)
{
InitializeSystem();
while (1)
{
if(flag_tx)
{
putcUSART (0x31);
flag_tx=0;
}
if(flag_rx)
{
putcUSART (0x32);
flag_rx=0;
}
while (!timer2_flag)
timer2_flag=0;
}
}
/***************************
* 系统初始化函数
****************************/
void InitializeSystem()
{
USARTInit();
ADCON1=0x0f; //把模拟端口全部设置为数字端口
/* Enable interrupt priority */
RCONbits.IPEN = 1;
/* Clear the peripheral interrupt flags */
PIR1 = 0;
/* Enable the timer interrupt */
PIE1bits.TMR2IE = 1;
IPR1bits.TMR2IP = 0;
/* Enable interrupts */
INTCONbits.GIEH = 1;
INTCONbits.GIEL = 1;
INTCONbits.PEIE = 1;
PR2=249;
T2CONbits.T2OUTPS2=1; //后分频比1:5
T2CONbits.T2CKPS0=1; //后分频比1:4
/* Enable the timer */
T2CONbits.TMR2ON = 1;
putcUSART (0x38);
UserInit(); //用户初始化
}
void USARTInit()
{
TRISCbits.TRISC6=0; //设置为输入引脚
TRISCbits.TRISC7=1; //设置为输入引脚
/* Make receive interrupt high priority */
IPR1bits.RCIP = 1;
OpenUSART (USART_TX_INT_OFF & //发送中断OFF
USART_RX_INT_ON & //接收中断ON
USART_ASYNCH_MODE & //异步模式
USART_EIGHT_BIT & //8bit
USART_CONT_RX & //连续传送
USART_BRGH_HIGH, 129); //高传输模式，9600,速率=Fosc/(16*(spbrg+1))
}
void UserInit()
{
TRISB=0x0F; //设置为输入引脚,按钮输入
TRISD=0xFF; //设置为输入引脚,按钮输入
LATD &= 0xF0; TRISD &= 0xF0; //LED指示灯
TRISE=0x00; //设置为输出引脚,点阵显示
TRISAbits.TRISA1=0; //设置为输出
PORTAbits.RA1=0;
}
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