汽车总线sent协议转RS232输出单片机源程序 -

//串口通迅实验，将该程序的HEX下载到开发板，用串口调试助手软件波特率设为9600
//发送任意一个字符，单片机返回该字符的ASII码
//-----------------------------------------------------------------------------
// Includes
//-----------------------------------------------------------------------------
#include <c8051f340.h> // SFR declarations
#include <stdio.h>
//-----------------------------------------------------------------------------
// Global CONSTANTS
//-----------------------------------------------------------------------------
#define SYSCLK 22118400 // SYSCLK frequency in Hz
#define BAUDRATE 9600 // Baud rate of UART in bps
sbit led1=P2^2;
sbit led2=P2^3;
sbit P20=P2^0;
//-----------------------------------------------------------------------------
// Function PROTOTYPES
//-----------------------------------------------------------------------------
void SYSCLK_Init (void);
void UART0_Init (void);
void PORT_Init (void);
void Timer0_Init (int);
void Ext_Interrupt_Init (void);
void INT1_ISR (void);
void Timer0_init (void);
unsigned int data count,tick,tickTemp,i,type;
unsigned int data dataR[20] ;
unsigned short data Sent=0,i;
bit data flagR,flag2,flagp01;
//-----------------------------------------------------------------------------
// MAIN Routine
//-----------------------------------------------------------------------------
void main (void)
{
flag2=0;
PORT_Init(); // Initialize Port I/O
PCA0MD &= ~0x40; // WDTE = 0 (clear watchdog timer
SYSCLK_Init (); // Initialize Oscillator
Ext_Interrupt_Init(); // enable)
led1=1;
led2=0;
UART0_Init();
Timer0_init();
EA=1;
while (1)
{
if(flag2||P20==0)
{
EA=0;
printf("angle= %f\n",(dataR[1]*256+dataR[2]*16+dataR[3])*283.0/4095);
led2=~led2;
Sent=0;
type=0;
flag2=0;
EA=1;
}
}
}
//-----------------------------------------------------------------------------
// PORT_Init
//-----------------------------------------------------------------------------
//
// P0.4 digital push-pull UART TX
// P0.5 digital open-drain UART RX
//
//-----------------------------------------------------------------------------
void PORT_Init (void)
{
P0MDIN &=~0xc0 ;
P0MDOUT |= 0x10; // Enable UTX as push-pull output
XBR0 = 0x01; // Enable UART on P0.4(TX) and P0.5(RX)
XBR1 = 0x40; // Enable crossbar and weak pull-ups
P2MDOUT |= 0x0c;
}
//-----------------------------------------------------------------------------
// SYSCLK_Init
//-----------------------------------------------------------------------------
//
// Return Value : None
// Parameters : None
//
// This routine initializes the system clock to use the internal oscillator
// at its maximum frequency.
// Also enables the Missing Clock Detector.
//-----------------------------------------------------------------------------
void SYSCLK_Init (void) //初始化系统时钟
{
//int i=0;
unsigned short data dly=0,dlyb=12;
//------------------------------------
//使能外部振荡器
OSCXCN |=0X67; //0110 0111
dlyb=22;
do {
dly=120;
while(dly--);
}while(dlyb--);
//等待1毫秒
do{
dly=100;
while(dly--);
}while((OSCXCN&0X80)!=0X80);
//查询XTLVLD =>1。
dly=100;
while(dly--);
CLKSEL |=0X01;
// OSCICN = 0x00;
}
void Timer0_init (void)
{
CKCON |=0X04;
TL0 = TH0=190; // Init Timer1
TMOD &= ~0x0f; // TMOD: timer 1 in 8-bit autoreload
TMOD |= 0x02;
TR0 = 1; // START Timer1
ET0=1;
}
//-----------------------------------------------------------------------------
// UART0_Init
//-----------------------------------------------------------------------------
//
// Configure the UART0 using Timer1, for <BAUDRATE> and 8-N-1.
//-----------------------------------------------------------------------------
void UART0_Init (void)
{
SCON0 = 0x10; // SCON0: 8-bit variable bit rate
// level of STOP bit is ignored
// RX enabled
// ninth bits are zeros
// clear RI0 and TI0 bits
//TH1 = 256-(SYSCLK/BAUDRATE/2/12);
TH1=256-96;
// CKCON &=~0x0c;
// CKCON |= 0x00; // T1M = 1; SCA1:0 = 00
TL1 = TH1; // Init Timer1
TMOD &= ~0xf0; // TMOD: timer 1 in 8-bit autoreload
TMOD |= 0x20;
TR1 = 1; // START Timer1
TI0 = 1; // Indicate TX0 ready
}
void Ext_Interrupt_Init (void)
{
TCON |= 0x05; // /INT 0 and /INT 1 are edge triggered
IT01CF = 0x10; // /INT0 active low; /INT0 on P0.0;
// /INT1 active low; /INT1 on P0.1
EX0 = 1; // Enable /INT0 interrupts
EX1 = 1; // Enable /INT1 interrupts
}
void INT1_ISR (void) interrupt 2
{
//同步计时器
TR0 = 0;
TL0 = TH0=191;
TR0 = 1; // START Timer1
//
if(tick>=34) tick=0;
//flagp01=P0^1;
tickTemp=tick;
tick=0;
if(flagR&&(Sent<=9)&&(tickTemp>=11)&&(tickTemp<=28))
{
dataR[Sent]=tickTemp-11;
Sent++;
}
if(flagR&&(Sent>=8))
{
Sent=0;
flagR=0;
flag2=1;
}
// if((tickTemp<10)||(tickTemp>28))
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