sbit BZ1=P1^4;
sbit BZ2=P1^5;
51单片机接收一大串语句如下
$SDALR,091313,001,A,A,BOTTOM LOST*77
$PFEC,SDmsi,1,2,M,K,F,200.0,1.57,4.00,0.00,0,1,1*1A
$PFEC,SDmsi,2,2,M,K,A,50.0,,4.00,0.00,0,1,1*1A
$SDDBT,5.1,f,1.5,M,0.8,F*0E
$SDDPT,1.5,0.0,10.5*65
$PFEC,xdr,FORE,200,1*63
$SDALR,091313,001,A,A,BOTTOM LOST*77
$PFEC,xdr,FORE,200,1*63
$PFEC,SDmsi,1,2,M,K,F,200.0,,4.00,0.00,0,1,1*1A
$PFEC,SDmsi,2,2,M,K,A,50.0,1.57,4.00,0.00,0,1,1*1A
$PFEC,SDmsi,2,2,M,K,A,50.0,2.57,4.00,0.00,0,1,1*1A
$SDDBT,5.1,f,1.5,M,0.8,F*0E
要求检测收到的数据中这2句语句
$PFEC,SDmsi,1,2,M,K,F,200.0,1.57,4.00,0.00,0,1,1*1A
$PFEC,SDmsi,2,2,M,K,A,50.0,1.57,4.00,0.00,0,1,1*1A
并对这2个语句判断,
$PFEC,SDmsi,1,2,M,K,F,200.0,1.57,4.00,0.00,0,1,1*1A
中有个,1.57, 如果这里的两个逗号中间有数据(不一定是1,57,有可能其他值)就是写BZ1=1,
没有数据就BZ1=0
同理
$PFEC,SDmsi,2,2,M,K,A,50.0,1.57,4.00,0.00,0,1,1*1A
,1.57,这里的两个逗号中间有数据(不一定是1,57,有可能其他值)就是写BZ2=1,
没有数据就BZ2=0
数据每秒钟接收更新一次,