gps 信号解析与显示
邵利超
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2010-07-04
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via 博客园 - 邵利超
#include <AVR_PQ1A.H> //包含自定义常量头文件 #include <AVR interrupt.h> uchar buf[500]; uint readCount=0; uint writeCount=0; uchar Time[6]; uchar Date[6]; uchar Status; uchar Latitude[9]; uchar NSIndicator; uchar Longitude[10]; uchar EWIndicator; uchar Speed[4]; void Uart_init(uint baud) { baud=MCLK/16/baud-1; UCSRB=0x00; UCSRA=0x00; UCSRC=(1<<URSEL)|(0<<UPM0)|(3<<UCSZ0); UBRRH="baud" UBRRL="baud;" 选择UCSRC，异步模式，禁止校验，1位停止位，8位数据位>>8; UCSRB=(1<<TXEN)|(1<<RXEN)|(1<<RXCIE); if(writeCount ++writeCount; 将接收到的数据存入全局数组 buf[writeCount]="UDR;" 关闭接收中断 UCSRB&="~BIT(RXCIE);" { ISR(USART_RXC_vect) ******************************************** 无 : 返回值 数: 参 异步串口接收 能: 功 Uart_RX 函数名称: ******************************************* } Uart_sendB(*sendpt++); 字符串未结束则继续发送 while(*sendpt) *sendpt) Uart_sentstr(uchar void sendpt--发送的数组指针 异步串口发送一个字符串 Uart_sentstr 清除发送完毕状态位 UCSRA|="1<<TXC;" 等待发送完毕 while(!(UCSRA&(1<<TXC))); 发送数据 UDR="sendB;" 等待发送缓冲区为空 while(!(UCSRA&(1<<UDRE))); sendB) Uart_sendB(uchar sendB--发送的字节数据 异步串口发送一个字节 Uart_sendB 配置TX为输出（很重要） DDRD|="0X02;" 全局中断开放 sei(); 接收、发送使能，接收中断使能> 499) writeCount = 0; UCSRB|=BIT(RXCIE); } uchar Read_byte(void) { uchar temp; while(readCount == writeCount) { Delayms(10); } temp = buf[readCount]; ++readCount; if(readCount > 499) readCount = 0; return temp; } void LCD1602_portini(void) { LCDa_CTRL_DDR |= BIT(LCDa_RS)|BIT(LCDa_RW)|BIT(LCDa_E); LCDa_DATA_DDR |= 0xFF; } uchar LCD1602_readbyte(uchar DatCmd) { uchar dByte; if (DatCmd == iCmd) LCDa_CLR_RS; else LCDa_SET_RS; LCDa_SET_RW; LCDa_SET_E; LCDa_DATA_DDR=0x00; dByte=LCDa_DI; Delayms(1); LCDa_CLR_E; LCDa_DATA_DDR|=0xff; return dByte; } void LCD1602_sendbyte(uchar DatCmd, uchar dByte) { if (DatCmd == iCmd) LCDa_CLR_RS; else LCDa_SET_RS; LCDa_CLR_RW; LCDa_SET_E; LCDa_DO = dByte; Delayms(1); LCDa_CLR_E; } void LCD1602_sendstr(uchar *ptString) { while((*ptString)!='\0') { LCD1602_sendbyte(iDat, *ptString++); } } void LCD1602_clear(void) { LCD1602_sendbyte(iCmd,LCDa_CLS); Delayms(40); } uchar LCD1602_readBF(void) { uchar busy; busy=LCD1602_readbyte(iCmd); if(busy&0x80) busy=1; else busy=0; return busy; } void LCD1602_gotoXY(uchar Row, uchar Col) { switch (Row) { case 1: LCD1602_sendbyte(iCmd, LCDa_L1 + Col); break; case 2: LCD1602_sendbyte(iCmd, LCDa_L2 + Col); break; default: break; } } void LCD1602_initial(void) { Delayms(100); LCD1602_portini(); LCD1602_sendbyte(iCmd, LCDa_FUNCTION); while(LCD1602_readBF()); LCD1602_sendbyte(iCmd, LCDa_ON); while(LCD1602_readBF()); LCD1602_clear(); while(LCD1602_readBF()); LCD1602_sendbyte(iCmd, LCDa_ENTRY); } void clear_gprmc(void) { uchar i; for(i=0; i<6; i++) { Time[i] = '0'; Date[i] = '0'; } for(i=0; i<9; i++) { Latitude[i] = '0'; } for(i=0; i<10; i++) { Longitude[i] = '0'; } for(i=0; i<4; i++) { Speed[i] = '0'; } Status = '0'; NSIndicator = '0'; EWIndicator = '0'; } void Parse_gprmc(void) { uchar i; uchar temp; clear_gprmc(); Read_byte(); temp = Read_byte(); if(',' != temp) { Time[0] = temp; for(i=0; i<5; i++) { Time[i+1] = Read_byte(); } Read_byte(); Read_byte(); Read_byte(); Read_byte(); } Status = Read_byte(); Read_byte(); temp = Read_byte(); if(',' != temp) { Latitude[0] = temp; for(i=0; i<3; i++) { Latitude[i+1] = Read_byte(); } Read_byte(); for(i=0; i<5; i++) { Latitude[4+i] = Read_byte(); } Read_byte(); } temp = Read_byte(); if(',' != temp) { NSIndicator = temp; Read_byte(); } temp = Read_byte(); if(',' != temp) { Longitude[0] = temp; for(i=0; i<4; i++) { Longitude[i+1] = Read_byte(); } Read_byte(); for(i=0; i<5; i++) { Longitude[5+i] = Read_byte(); } Read_byte(); } temp = Read_byte(); if(',' != temp) { EWIndicator = temp; Read_byte(); } temp = Read_byte(); if(',' != temp) { Speed[0] = temp; Read_byte(); for(i=0; i<3; i++) { Speed[1+i] = Read_byte(); } Read_byte(); } Read_byte(); temp = Read_byte(); if(',' != temp) { Date[0] = temp; for(i=0; i<5; i++) { Date[i+1] = Read_byte(); } } } void Display_gprmc(void) { uchar high,low,i; high = Time[0]; low = Time[1]; low = low+8; if(low > 57) { low = low - 10; high = high + 1; } LCD1602_clear(); while(LCD1602_readBF()); LCD1602_gotoXY(1,0); LCD1602_sendbyte(iDat,high); LCD1602_sendbyte(iDat,low); LCD1602_sendbyte(iDat,':'); LCD1602_sendbyte(iDat,Time[2]); LCD1602_sendbyte(iDat,Time[3]); LCD1602_sendbyte(iDat,':'); LCD1602_sendbyte(iDat,Time[4]); LCD1602_sendbyte(iDat,Time[5]); LCD1602_sendbyte(iDat,' '); LCD1602_sendbyte(iDat,Status); while(LCD1602_readBF()); LCD1602_gotoXY(2,0); LCD1602_sendbyte(iDat,Date[4]); LCD1602_sendbyte(iDat,Date[5]); LCD1602_sendbyte(iDat,'.'); LCD1602_sendbyte(iDat,Date[2]); LCD1602_sendbyte(iDat,Date[3]); LCD1602_sendbyte(iDat,'.'); LCD1602_sendbyte(iDat,Date[0]); LCD1602_sendbyte(iDat,Date[1]); Delayms(50000); LCD1602_clear(); while(LCD1602_readBF()); LCD1602_gotoXY(1,0); LCD1602_sendbyte(iDat,Latitude[0]); LCD1602_sendbyte(iDat,Latitude[1]); LCD1602_sendbyte(iDat,'.'); for(i=0; i<7; i++) { LCD1602_sendbyte(iDat,Latitude[2+i]); } LCD1602_sendbyte(iDat,' '); LCD1602_sendbyte(iDat,NSIndicator); while(LCD1602_readBF()); LCD1602_gotoXY(2,0); LCD1602_sendbyte(iDat,Longitude[0]); LCD1602_sendbyte(iDat,Longitude[1]); LCD1602_sendbyte(iDat,Longitude[2]); LCD1602_sendbyte(iDat,'.'); for(i=0; i<7; i++) { LCD1602_sendbyte(iDat,Longitude[3+i]); } LCD1602_sendbyte(iDat,' '); LCD1602_sendbyte(iDat,EWIndicator); Delayms(50000); } void Read_gprmc(void) { uchar temp = 0; temp = Read_byte(); if(temp == '$') { Read_byte(); Read_byte(); temp = Read_byte(); if(temp == 'R') { temp = Read_byte(); if(temp == 'M') { temp = Read_byte(); if(temp == 'C') { Parse_gprmc(); Display_gprmc(); } } } } } int main(void) { Board_init( ); Uart_init(9600); LCD1602_initial(); while(LCD1602_readBF()); LCD1602_gotoXY(1,0); LCD1602_sendstr("AVR_PQ1A BOARD"); while(1) { Read_gprmc(); } }
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