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void GPS_JieXi(void)
{
unsigned int i = 0;
unsigned int j=0;
qian_OK=0; //標(biāo)志變量歸零
k=0; //累計量歸零
if (First_Share_OK==0) //讓變量j在0~10000之間來回增減，增加到10000時顯示". ",減到0時顯示" .",實現(xiàn)兩點(diǎn)來回閃動
{
if (jiajian==1)
{
j++;
if (j==10000)
{
jiajian=0;
LCD_write_command(0x8e);
LCD_write_data('.');
LCD_write_command(0x8f);
LCD_write_data(' ');
}
}
else
{
j--;
if (j==0)
{
jiajian=1;
LCD_write_command(0x8e);
LCD_write_data(' ');
LCD_write_command(0x8f);
LCD_write_data('.');
}
}
}
//------------------------------------------------- 解析海拔 ---------------------------------------------------
if ( Flag_GPS_OK == 1
&& RX_Buffer[1] == 'G'
&& RX_Buffer[3] == 'G'
&& RX_Buffer[4] == 'G'
&& RX_Buffer[5] == 'A'
&& (RX_Buffer[28] == 'N'|| RX_Buffer[28] == 'S')
&& (RX_Buffer[41] == 'E'|| RX_Buffer[41] == 'W') ) //確認(rèn)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, (GPGGA完整有效的數(shù)據(jù)已收到的標(biāo)志變量)
}
if(Flag_Calc_GPGGA_OK == 1) //已收到完整有效的數(shù)據(jù)，可以進(jìn)行顯示，
{
Flag_Calc_GPGGA_OK = 0; //標(biāo)志位歸零
if (First_Share_OK == 0)
{
First_Share_OK=1; //"Searching data. "不需再顯示，標(biāo)志變量置為1
LCD_write_command(0x01); //先清屏
}
LCD_write_command(0x80);
LCD_write_word("H:");
for (i=0;i<68;i++) //由于海拔有時是1位數(shù)有時是2位數(shù)有時是3位數(shù)，不定
{ //而確定的是其數(shù)值在第9與第10個逗號之間，所以用此算法輸出海拔
if ( Display_GPGGA_Buffer[i]==',' ) //逐個檢索
k++; //k計算逗號數(shù)量
if (k==9&&qian_OK==0)
qian_a=i,qian_OK=1; //找到第9個，則記錄其序號，同時標(biāo)志變量置為1
if (k==10) //海拔數(shù)據(jù)位于第9~10個逗號之間
{
hou_a=i; //記錄第10個的序號
k=0; //歸零
qian_OK=0; //重置為0
break; //找到后直接跳出循環(huán)
}
}
LCD_write_command(0x82); //準(zhǔn)備在第一行第9列輸出海拔數(shù)據(jù)
switch(hou_a-qian_a-1) //計算海拔數(shù)據(jù)的長度
{
case 3:LCD_write_word(" ");break; //根據(jù)海拔數(shù)據(jù)長度輸出對應(yīng)所需的空格數(shù)，使其顯示方式為右對齊
case 4:LCD_write_word(" ");break;
case 5:LCD_write_word(" ");break;
case 6:break;
case 7:break;
}
for (i=qian_a+1; i<=hou_a-1; i++)
LCD_write_data(Display_GPGGA_Buffer[i]); //輸出海拔
LCD_write_data(' ');
LCD_write_data('m'); //顯示單位
LCD_write_command(0x8D);
LCD_write_data('*');
LCD_write_command(0x8e);
LCD_write_data(Display_GPGGA_Buffer[45]); // 正在使用衛(wèi)星數(shù)量十位
LCD_write_command(0x8f);
LCD_write_data(Display_GPGGA_Buffer[46]); // 正在使用衛(wèi)星數(shù)量個位
}
//---------------------------------------------------------- 解析速度 -----------------------------------------------------------------
if( Flag_GPS_OK == 1
&& RX_Buffer[1] == 'G'
&& RX_Buffer[3] == 'V'
&& RX_Buffer[4] == 'T'
&& RX_Buffer[5] == 'G') //確認(rèn)是否收到"GNVTG"這一幀完整有效的數(shù)據(jù)
{
for( i = 0; i < 67 ; i++)
{
Display_GNVTG_Buffer[i] = RX_Buffer[i];
}
Flag_Calc_GNVTG_OK = 1;
}
if(Flag_Calc_GNVTG_OK == 1) //GNVTG數(shù)據(jù)完整有效則顯示
{
Flag_Calc_GNVTG_OK = 0;
if (First_Share_OK == 0) //已開始LCD顯示的標(biāo)志變量
{
First_Share_OK=1; //已開始LCD顯示的標(biāo)志變量
LCD_write_command(0x01);
}
LCD_write_command(0xc0); // 速度顯示位置
LCD_write_word("V:");
for (i=0;i<68;i++) //由于速度數(shù)據(jù)也是位數(shù)不定，故亦用此算法精確地確定速度數(shù)據(jù)位置
{
if ( Display_GNVTG_Buffer[i]==',' )
k++;
if (k==7&&qian_OK==0) //速度數(shù)據(jù)位于第7~8個逗號之間
qian_c=i,qian_OK=1;
if (k==8)
{
hou_c=i;
k=0;
qian_OK=0;
break;
}
}
LCD_write_command(0xc2); //準(zhǔn)備在第2行第9列顯示
switch(hou_c-qian_c-2) //原式為(hou_c-1)-qian_c-1。由于速度不太準(zhǔn)還浮動，故只讓它顯示一位小數(shù)
{
case 3:LCD_write_word("");break; //使右對齊
case 4:break;
case 5:break;
}
for (i=qian_c+1; i<=hou_c-1; i++) //（原式為hou_c-1-1）、減4剛好取個整數(shù)，沒有小數(shù)點(diǎn)了。
LCD_write_command(0xc2);
LCD_write_data(Display_GNVTG_Buffer[qian_c+1]);
LCD_write_command(0xc3);
LCD_write_data(Display_GNVTG_Buffer[qian_c+2]);
LCD_write_command(0xc4);
LCD_write_data(Display_GNVTG_Buffer[qian_c+3]);
//LCD_write_data(Display_GNVTG_Buffer[i]); //顯示速度
LCD_write_command(0xc6);
LCD_write_word("km/s"); //顯示單位
}
}

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