/*---------------------------------------------------------------------*/ /* --- STC MCU Limited ------------------------------------------------*/ /* --- 使用主芯片对从芯片(限STC15系列)进行ISP下载举例 -----------------*/ /* --- Mobile: (86)13922805190 ----------------------------------------*/ /* --- Fax: 86-755-82905966 -------------------------------------------*/ /* --- Tel: 86-755-82948412 -------------------------------------------*/ /* --- Web: www.STCMCU.com --------------------------------------------*/ /* 如果要在程序中使用此代码,请在程序中注明使用了宏晶科技的资料及程序 */ /* 如果要在文章中应用此代码,请在文章中注明使用了宏晶科技的资料及程序 */ /*---------------------------------------------------------------------*/ //本示例在Keil开发环境下请选择Intel的8058芯片型号进行编译 //假定测试芯片的工作频率为11.0592MHz //注意:使用本代码对STC15系列的单片机进行下载时,必须要执行了Download代码之后, //才能给目标芯片上电,否则目标芯片将无法正确下载 #include "reg51.h" typedef bit BOOL; typedef unsigned char BYTE; typedef unsigned short WORD; typedef unsigned long DWORD; //宏、常量定义 #define FALSE 0 #define TRUE 1 #define LOBYTE(w) ((BYTE)(WORD)(w)) #define HIBYTE(w) ((BYTE)((WORD)(w) >> 8)) #define MINBAUD 2400L #define MAXBAUD 115200L #define FOSC 11059200L //主控芯片工作频率 #define BR(n) (65536 - FOSC/4/(n)) //主控芯片串口波特率计算公式 #define T1MS (65536 - FOSC/1000) //主控芯片1ms定时初值 #define FUSER 24000000L //15系列目标芯片工作频率 #define RL(n) (65536 - FUSER/4/(n)) //15系列目标芯片串口波特率计算公式 //SFR定义 sfr AUXR = 0x8e; //变量定义 BOOL f1ms; //1ms标志位 BOOL UartBusy; //串口发送忙标志位 BOOL UartReceived; //串口数据接收完成标志位 BYTE UartRecvStep; //串口数据接收控制 BYTE TimeOut; //串口通讯超时计数器 BYTE xdata TxBuffer[256]; //串口数据发送缓冲区 BYTE xdata RxBuffer[256]; //串口数据接收缓冲区 char code DEMO[256]; //演示代码数据 //函数声明 void Initial(void); void DelayXms(WORD x); BYTE UartSend(BYTE dat); void CommInit(void); void CommSend(BYTE size); BOOL Download(BYTE *pdat, long size); //主函数入口 void main(void) { while (1) { Initial(); if (Download(DEMO, 0x0100)) { //下载成功 P3 = 0xff; DelayXms(500); P3 = 0x00; DelayXms(500); P3 = 0xff; DelayXms(500); P3 = 0x00; DelayXms(500); P3 = 0xff; DelayXms(500); P3 = 0x00; DelayXms(500); P3 = 0xff; } else { //下载失败 P3 = 0xff; DelayXms(500); P3 = 0xf3; DelayXms(500); P3 = 0xff; DelayXms(500); P3 = 0xf3; DelayXms(500); P3 = 0xff; DelayXms(500); P3 = 0xf3; DelayXms(500); P3 = 0xff; } } } //1ms定时器中断服务程序 void tm0(void) interrupt 1 using 1 { static BYTE Counter100; f1ms = TRUE; if (Counter100-- == 0) { Counter100 = 100; if (TimeOut) TimeOut--; } } //串口中断服务程序 void uart(void) interrupt 4 using 1 { static WORD RecvSum; static BYTE RecvIndex; static BYTE RecvCount; BYTE dat; if (TI) { TI = 0; UartBusy = FALSE; } if (RI) { RI = 0; dat = SBUF; switch (UartRecvStep) { case 1: if (dat != 0xb9) goto L_CheckFirst; UartRecvStep++; break; case 2: if (dat != 0x68) goto L_CheckFirst; UartRecvStep++; break; case 3: if (dat != 0x00) goto L_CheckFirst; UartRecvStep++; break; case 4: RecvSum = 0x68 + dat; RecvCount = dat - 6; RecvIndex = 0; UartRecvStep++; break; case 5: RecvSum += dat; RxBuffer[RecvIndex++] = dat; if (RecvIndex == RecvCount) UartRecvStep++; break; case 6: if (dat != HIBYTE(RecvSum)) goto L_CheckFirst; UartRecvStep++; break; case 7: if (dat != LOBYTE(RecvSum)) goto L_CheckFirst; UartRecvStep++; break; case 8: if (dat != 0x16) goto L_CheckFirst; UartReceived = TRUE; UartRecvStep++; break; L_CheckFirst: case 0: default: CommInit(); UartRecvStep = (dat == 0x46 ? 1 : 0); break; } } } //系统初始化 void Initial(void) { UartBusy = FALSE; SCON = 0xd0; //串口数据模式必须为8位数据+1位偶检验 AUXR = 0xc0; TMOD = 0x00; TH0 = HIBYTE(T1MS); TL0 = LOBYTE(T1MS); TR0 = 1; TH1 = HIBYTE(BR(MINBAUD)); TL1 = LOBYTE(BR(MINBAUD)); TR1 = 1; ET0 = 1; ES = 1; EA = 1; } //Xms延时程序 void DelayXms(WORD x) { do { f1ms = FALSE; while (!f1ms); } while (x--); } //串口数据发送程序 BYTE UartSend(BYTE dat) { while (UartBusy); UartBusy = TRUE; ACC = dat; TB8 = P; SBUF = ACC; return dat; } //串口通讯初始化 void CommInit(void) { UartRecvStep = 0; TimeOut = 20; UartReceived = FALSE; } //发送串口通讯数据包 void CommSend(BYTE size) { WORD sum; BYTE i; UartSend(0x46); UartSend(0xb9); UartSend(0x6a); UartSend(0x00); sum = size + 6 + 0x6a; UartSend(size + 6); for (i=0; i

2022-01-05 17:02:20 11KB 串口ISP下载 STC单片机 STC下载协议 STC-ISP

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