DFRobot TEL0051 Manual page 26

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" C h e c k s u m " ,
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} ;
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/ /
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c h a r * g p r m c _ t a b l e [ R M C _ N U M ] = {
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" M e s s a g e I D " ,
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" U T C T i m e " ,
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" S t a t u s " ,
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" L a t i t u d e " ,
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" N / S I n d i c a t o r " ,
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" L a n g i t u d e " ,
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" E / W I n d i c a t o r " ,
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" S p e e d O v e r G r o u n d " ,
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" C o u r s e O v e r G r o u n d " ,
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" D a t e " ,
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" M a g n e t i c V a r i a t i o n " ,
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" E a s t / W e s t I n d i c a t o r " ,
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" M o d e " ,
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" C h e c k s u m " ,
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} ;
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63
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/ / s a v e d a t a f r o m G P S
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u i n t 8 _ t g p s _ b u f [ G P S _ B U F _ S I Z E ] ;
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67
/ / s a v e p o i n t e r o f g g a b l o c k
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u i n t 8 _ t * g g a _ p [ G G A _ N U M ] ;
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u i n t 8 _ t * g p r m c _ p [ R M C _ N U M ] ;
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/ / c h e c k s u m u s i n g x o r
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u i n t 8 _ t c h e c k s u m _ x o r ( u i n t 8 _ t * a r r a y , u i n t 8 _ t l e n g ) {
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u i n t 8 _ t s u m = a r r a y [ 0 ] ;
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f o r ( u i n t 8 _ t i = 1 ; i < l e n g ; i + + ) {
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s u m ^ = a r r a y [ i ] ;
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}
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r e t u r n s u m ;
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}
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/ /
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v o i d s t a r t _ g p s ( ) {
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d i g i t a l W r i t e ( 5 , H I G H ) ;
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d e l a y ( 1 5 0 0 ) ;
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d i g i t a l W r i t e ( 5 , L O W ) ;
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d e l a y ( 1 5 0 0 ) ;
/ / 1 4
/ / 0
/ / 1
/ / 2
/ / 3
/ / 4
/ / 5
/ / 6
/ / 7
/ / 8
/ / 9
/ / 1 0
/ / 1 1
/ / 1 2
/ / 1 3