總結(jié):串口收+發(fā),SCON=0x50;

串口只發(fā)送,SCON=0x40;

感謝在宋老師這兒,學(xué)會(huì)了,定時(shí)器,串口,中斷等難點(diǎn)

//跟堂作業(yè),軟件模擬串口收發(fā)
#include <reg52.h>

typedef unsigned char u8;
typedef unsigned int u16;
typedef unsigned long u32;
typedef signed char i8;
typedef signed int i16;
typedef signed long i32;

sbit PIN_RXD = P3 ^ 0;
sbit PIN_TXD = P3 ^ 1;
sbit a = P2 ^ 4;//監(jiān)視變量,邏輯分析儀抓波用

void ConfigUART(u16 buad);
void StartRXD();
void StartTXD(u8 dat);

bit RxdEnd;
bit TxdEnd;
u8 RxdBuf, TxdBuf;
bit RxdOrTxd = 0; // 0=res;1=sent

void main(void)
{
?? ?EA = 1;
?? ?ConfigUART(9600);

?? ?while (1)
?? ?{
?? ??? ?while (PIN_RXD)
?? ??? ??? ?;
?? ??? ?StartRXD();
?? ??? ?while (RxdEnd == 0)
?? ??? ??? ?;
?? ??? ?StartTXD(RxdBuf + 1);
?? ??? ?while (TxdEnd == 0)
?? ??? ??? ?;
?? ?}
}

void ConfigUART(u16 buad)
{
?? ?TMOD &= 0xF0; // T0,m2
?? ?TMOD |= 0x02;

?? ?TH0 = 256 - (11059200 / 12) / buad;
?? ?//160
}

void StartRXD()
{
?? ?TL0 = 256 - ((256 - TH0) >> 1) +40;//40是補(bǔ)償值,通過邏輯分析儀測(cè)出來的
?? ?ET0 = TR0 = 1;
?? ?RxdEnd = 0;
?? ?RxdOrTxd = 0;
}

void StartTXD(u8 dat)
{
?? ?TxdBuf = dat;
?? ?TL0 = TH0;
?? ?ET0 = TR0 = 1;
?? ?PIN_TXD = 0;
?? ?TxdEnd = 0;
?? ?RxdOrTxd = 1;
}

void Timer0_ISR(void) interrupt 1
{
?? ?static u8 cnt = 0;

?? ?a=0;//監(jiān)視變量,邏輯分析儀抓波用//進(jìn)來拉低
?? ?if (RxdOrTxd)
?? ?{
?? ??? ?// sent
?? ??? ?cnt++;
?? ??? ?if (cnt <= 8)
?? ??? ?{
?? ??? ??? ?PIN_TXD = TxdBuf & 0x01;
?? ??? ??? ?TxdBuf >>= 1;
?? ??? ?}
?? ??? ?else if (cnt == 9)
?? ??? ?{
?? ??? ??? ?PIN_TXD = 1;
?? ??? ?}
?? ??? ?else
?? ??? ?{
?? ??? ??? ?cnt = 0;
?? ??? ??? ?TR0 = 0;
?? ??? ??? ?TxdEnd = 1;
?? ??? ?}
?? ?}
?? ?else
?? ?{
?? ??? ?if (cnt == 0)
?? ??? ?{
?? ??? ??? ?if (PIN_RXD == 0)
?? ??? ??? ?{
?? ??? ??? ??? ?RxdBuf = 0;
?? ??? ??? ??? ?cnt++;
?? ??? ??? ?}
?? ??? ?}
?? ??? ?else if (cnt <= 8)
?? ??? ?{
?? ??? ??? ?RxdBuf >>= 1;
?? ??? ??? ?if (PIN_RXD)
?? ??? ??? ?{
?? ??? ??? ??? ?RxdBuf |= 0x80;
?? ??? ??? ?}
?? ??? ??? ?cnt++;
?? ??? ?}
?? ??? ?else
?? ??? ?{
?? ??? ??? ?cnt = 0;
?? ??? ??? ?TR0 = 0;
?? ??? ??? ?if (PIN_RXD)
?? ??? ??? ?{
?? ??? ??? ??? ?RxdEnd = 1;
?? ??? ??? ?}
?? ??? ?}
?? ?}

?? ?a=1;//監(jiān)視變量,邏輯分析儀抓波用//出去拉高
}



// 課后作業(yè)5和6合并完成
// pc發(fā)送hex數(shù)字:
// 1=流水燈流動(dòng)(默認(rèn))
// 2=流水燈停止
// 3=蜂鳴器響
// 4=蜂鳴器關(guān)閉(默認(rèn))

#include <reg52.h>

typedef unsigned char u8;
typedef unsigned int u16;
typedef unsigned long u32;
typedef signed char i8;
typedef signed int i16;
typedef signed long i32;

sbit ADDR3 = P1 ^ 3;
sbit ENLED = P1 ^ 4;
sbit BEEP = P1 ^ 6;

#define SYS_CLK 11059200
#define TIMER_CLK (SYS_CLK / 12)

void ConfigTimer0(u8 ms);
void ConfigUART(u16 buad);

u8 TH0RL, TL0RL;

u8 LedBuf[8] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
u8 code LedChar[] = {
??? 0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8,
??? 0x80, 0x90, 0x88, 0x83, 0xC6, 0xA1, 0x86, 0x8E};
u8 code LedShift[14] = {0xFE, 0xFD, 0xFB, 0xF7, 0xEF, 0xDF, 0xBF, 0x7F, 0xBF, 0xDF, 0xEF, 0xF7, 0xFB, 0xFD};

bit ReceiveDatFlag = 0;
u8 ReceiveDat = 0;

bit EnLedShiftFlag = 1;
bit EnBeepFlag = 0;
bit Flag200ms = 0;

void main(void)
{
?? ?int i;

?? ?EA = 1;

?? ?ENLED = 0;
?? ?ADDR3 = 1;

?? ?ConfigTimer0(1);
?? ?ConfigUART(9600);

?? ?while (1)
?? ?{
?? ??? ?if (ReceiveDatFlag)
?? ??? ?{
?? ??? ??? ?ReceiveDatFlag = 0;
?? ??? ??? ?switch (ReceiveDat)
?? ??? ??? ?{
?? ??? ??? ?case 1:
?? ??? ??? ??? ?EnLedShiftFlag = 1; // 1=流水燈流動(dòng)
?? ??? ??? ??? ?break;
?? ??? ??? ?case 2:
?? ??? ??? ??? ?EnLedShiftFlag = 0; // 2=流水燈停止
?? ??? ??? ??? ?break;
?? ??? ??? ?case 3:
?? ??? ??? ??? ?EnBeepFlag = 1; // 3=蜂鳴器響
?? ??? ??? ??? ?break;
?? ??? ??? ?case 4:
?? ??? ??? ??? ?EnBeepFlag = 0; // 4=蜂鳴器關(guān)閉
?? ??? ??? ??? ?break;
?? ??? ??? ?default:
?? ??? ??? ??? ?break;
?? ??? ??? ?}
?? ??? ?}

?? ??? ?if (EnLedShiftFlag && Flag200ms)
?? ??? ?{
?? ??? ??? ?Flag200ms = 0;
?? ??? ??? ?LedBuf[6] = LedShift[i];
?? ??? ??? ?if (++i >= 14)
?? ??? ??? ?{
?? ??? ??? ??? ?i = 0;
?? ??? ??? ?}
?? ??? ?}
?? ??? ?else
?? ??? ?{
?? ??? ??? ?Flag200ms = 0;
?? ??? ?}
?? ?}
}

void ConfigTimer0(u8 ms)
{
?? ?u16 tmp;

?? ?TMOD &= 0xF0;
?? ?TMOD |= 0x01;
?? ?tmp = TIMER_CLK * ms / 1000;
?? ?tmp = 65536 - tmp;
?? ?TH0 = TH0RL = (u8)(tmp >> 8);
?? ?TL0 = TL0RL = (u8)tmp;

?? ?ET0 = TR0 = 1;
}

void ConfigUART(u16 buad)
{
?? ?SCON = 0x50;
?? ?TMOD &= 0x0F; // T1
?? ?TMOD |= 0x20;
?? ?TH1 = TL1 = 256 - 11059200 / 12 / 32 / buad;

?? ?ET1 = 0;
?? ?TR1 = 1;

?? ?ES = 1;
}

void LedScan(void)
{
?? ?static u8 i = 0;

?? ?P0 = 0xFF;
?? ?P1 = (P1 & 0xF8) | i;
?? ?P0 = LedBuf[i];
?? ?i++;
?? ?i &= 0x07;
}

void BeepScan(void)
{
?? ?if (EnBeepFlag)
?? ?{
?? ??? ?BEEP = !BEEP;
?? ?}
?? ?else
?? ?{
?? ??? ?BEEP = 1;
?? ?}
}

void Timer0_ISR(void) interrupt 1
{
?? ?static u16 cnt = 0;

?? ?TH0 = TH0RL;
?? ?TL0 = TL0RL;

?? ?if (++cnt >= 500)
?? ?{
?? ??? ?cnt = 0;
?? ??? ?Flag200ms = 1;
?? ?}

?? ?BeepScan();
?? ?LedScan();
}

void UART_ISR(void) interrupt 4
{
?? ?if (RI)
?? ?{
?? ??? ?RI = 0;
?? ??? ?ReceiveDat = SBUF;
?? ??? ?ReceiveDatFlag = 1;
?? ?}
?? ?if (TI)
?? ?{
?? ??? ?TI = 0;
?? ?}
}