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#include <reg51.h>
#include "iic_oled.h"
#define u8 unsigned char
#define u16 unsigned int
#define u32 unsigned long
u8 RX_Buffer[68]; //此數(shù)組用于直接儲存來自GPS的原始數(shù)據(jù)
u8 RX_Count = 0;
//u8 Hour = 0,Min_High = 0,Min_Low = 0,Sec_High = 0,Sec_Low = 0;
u8 Month = 0,Day = 0,Month_High = 0, Month_Low = 0,Day_Low = 0 ,Day_High = 0, Year_High = 0,Year_Low = 0;
u16 Year = 0;
bit Flag_GPS_OK = 0;
u8 MaxDay = 0;
u8 xdata Display_GPGGA_Buffer[68]={0}; //用于儲存GPGGA的數(shù)據(jù)
bit Flag_Calc_GPGGA_OK = 0; //GPGGA完整有效的數(shù)據(jù)已收到的標志變量
void Uart_Init();
u8 GetMaxDay(u8 Month_Value,u16 Year_Value);
bit IsLeapYear(u16 uiYear);
void Delay500ms() ;
//****************************************************
//主函數(shù)
//****************************************************
void main()
{
u16 i = 0;
Uart_Init(); //串口初始化
OLED_Init();//初始化OLED
OLED_Clear();//清屏
while(1)
{
if ( Flag_GPS_OK == 1 && RX_Buffer[4] == 'G'
&& RX_Buffer[6] == ',' && RX_Buffer[13] == '.'
) //確認是否收到"GPGGA"這一幀完整有效的數(shù)據(jù)
{
for( i = 0; i < 67 ; i++) //必須為i<67，因為要確保Display_GPGGA_Buffer[67]為'\0',便于串口發(fā)送
{
Display_GPGGA_Buffer[i] = RX_Buffer[i]; //儲存到數(shù)組中
}
Flag_Calc_GPGGA_OK = 1; //收到完整有效數(shù)據(jù)后，置為1
}
if(Display_GPGGA_Buffer[28] == 'N')
{
OLED_ShowChar(0, 0, 'G');
OLED_ShowChar(8, 0, 'P');
OLED_ShowChar(16, 0, 'S');
OLED_ShowChar(24, 0, ':');
OLED_ShowChar(0, 2, Display_GPGGA_Buffer[28]);//N
OLED_ShowChar(8, 2, ':'); //:
OLED_ShowChar(16, 2, Display_GPGGA_Buffer[17]);
OLED_ShowChar(24, 2, Display_GPGGA_Buffer[18]);
OLED_ShowChar(32, 2, 127);
OLED_ShowChar(40, 2, Display_GPGGA_Buffer[19]);
OLED_ShowChar(48, 2, Display_GPGGA_Buffer[20]);
OLED_ShowChar(56, 2, '.');
OLED_ShowChar(64, 2, Display_GPGGA_Buffer[22]);
OLED_ShowChar(72, 2, Display_GPGGA_Buffer[23]);
OLED_ShowChar(80, 2, Display_GPGGA_Buffer[24]);
OLED_ShowChar(88, 2, Display_GPGGA_Buffer[25]);
OLED_ShowChar(96, 2, Display_GPGGA_Buffer[26]);
OLED_ShowChar(104, 2, 39);
OLED_ShowChar(0, 4, Display_GPGGA_Buffer[42]);//E
OLED_ShowChar(8, 4, ':'); //:
OLED_ShowChar(16, 4, Display_GPGGA_Buffer[30]);
OLED_ShowChar(24, 4, Display_GPGGA_Buffer[31]);
OLED_ShowChar(32, 4, Display_GPGGA_Buffer[32]);
OLED_ShowChar(40, 4, 127);
OLED_ShowChar(48, 4, Display_GPGGA_Buffer[33]);
OLED_ShowChar(56, 4, Display_GPGGA_Buffer[34]);
OLED_ShowChar(64, 4, '.');
OLED_ShowChar(72, 4, Display_GPGGA_Buffer[36]);
OLED_ShowChar(80, 4, Display_GPGGA_Buffer[37]);
OLED_ShowChar(88, 4, Display_GPGGA_Buffer[38]);
OLED_ShowChar(96, 4, Display_GPGGA_Buffer[39]);
OLED_ShowChar(104, 4, Display_GPGGA_Buffer[40]);
OLED_ShowChar(112, 4, 39);
}
else
{
OLED_ShowChar(0, 0, 'G');
OLED_ShowChar(8, 0, 'P');
OLED_ShowChar(16, 0, 'S');
OLED_ShowChar(24, 0, ':');
OLED_ShowChar(0, 2, 'n');//N
OLED_ShowChar(8, 2, 'o'); //:
OLED_ShowChar(16, 2, 't');
OLED_ShowChar(24, 2, 32);
OLED_ShowChar(32, 2, 'c');
OLED_ShowChar(40, 2, 'o');
OLED_ShowChar(48, 2, 'n');
OLED_ShowChar(56, 2, 'n');
OLED_ShowChar(64, 2, 'e');
OLED_ShowChar(72, 2, 'c');
OLED_ShowChar(80, 2, 't');
OLED_ShowChar(88, 2, 32);
OLED_ShowChar(96, 2, 32);
OLED_ShowChar(104, 2, 32);
OLED_ShowChar(0,4, 32);//E
OLED_ShowChar(8,4, 32); //:
OLED_ShowChar(16,4, 32);
OLED_ShowChar(24,4, 32);
OLED_ShowChar(32,4, 32);
OLED_ShowChar(40,4, 32);
OLED_ShowChar(48,4, 32);
OLED_ShowChar(56,4, 32);
OLED_ShowChar(64,4, 32);
OLED_ShowChar(72,4, 32);
OLED_ShowChar(80,4, 32);
OLED_ShowChar(88,4, 32);
OLED_ShowChar(96,4, 32);
OLED_ShowChar(104,4, 32);
OLED_ShowChar(112,4, 32);
}
}
}
void Uart_Init()
{
SCON = 0X50; //UART方式1；8位UART
REN = 1; //允許串行口接收數(shù)據(jù)
PCON = 0x00; //SMOD=0;波特率不加倍
TMOD = 0x20; //T1方式2，用于產(chǎn)生波特率
TH1 = 0xFD; //裝初值
TL1 = 0xFD;
TR1 = 1; //啟動定時器1
EA = 1; //打開全局中斷控制
ES = 1; //打開串行口中斷
}
void RECEIVE_DATA(void) interrupt 4 using 3 //串口中斷函數(shù)，收到GPS的數(shù)據(jù)時進入此中斷
{
u8 temp = 0;
ES=0; //先關閉串行口中斷
if(RI)
{
temp = SBUF; //接收SBUF中的數(shù)據(jù)
if(temp == '
) //若是統(tǒng)一的數(shù)據(jù)頭，則作為數(shù)組第一個元素
{
RX_Count = 0;
Flag_GPS_OK = 0;
}
RX_Buffer[RX_Count++] = temp; //收到的數(shù)據(jù)放到數(shù)組中
if(RX_Count >= 66) //序號大于66的數(shù)據(jù)無用，統(tǒng)一放到第66位覆蓋掉
{
RX_Count = 66;
}
if(temp == '*') //收到*，則完成一幀數(shù)據(jù)的接收，不管是否完整有效
{
Flag_GPS_OK = 1; //標志變量置為1
}
}
RI = 0; //接收完成的標志位清零
ES=1; //重新打開串行口中斷
}

復制代碼