telecommand decoding

Dependencies:   mbed

Files at this revision

API Documentation at this revision

Comitter:
cholletisaik777
Date:
Fri May 15 05:15:08 2015 +0000
Commit message:
telecommand decoding

Changed in this revision

main.cpp Show annotated file Show diff for this revision Revisions of this file
mbed.bld Show annotated file Show diff for this revision Revisions of this file
diff -r 000000000000 -r 81017b9a3647 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri May 15 05:15:08 2015 +0000
@@ -0,0 +1,76 @@
+/*all variables used----------------
+In one Frame sequence - Flag -> Packet -> CRC
+flag
+{0x7E(8)}
+Packet - either Short or Long
+{
+psc-Packet Sequence Count(8)
+apid-Application Id(2)
+lfb-Last Frame Bit(1)
+los-Long or Short(1)
+aon-Abort on Nack(1)
+spr-Spare(2)
+ack-Acknoledge(1)
+st-Service type(4)
+sst-Service Sub Type(4)
+appdata-Application Data(48 or 1040)
+}
+crc-Frame Check Sequence(16)
+
+There are totally 12 bytes for short frame
+and 136 for long frame
+Short frame-12
+{
+    bytes-names
+    1-Flag
+    1-PSC
+    1-APID(2)+LFB(1)+LoS(1)+AoN(1)+Spr(2)+Ack(1)
+    1-ST(4)+SST(4)
+    6-Appdata
+    2-CRC
+}
+Long frame-136
+{
+    bytes-names
+    1-Flag
+    1-PSC
+    1-APID(2)+LFB(1)+LoS(1)+AoN(1)+Spr(2)+Ack(1)
+    1-ST(4)+SST(4)
+    130-Appdata
+    2-CRC
+}
+------------------------------------*/
+#include "mbed.h"
+
+Serial pc(USBTX,USBRX);
+
+int main()
+{
+    char data[2],flag,psc,apid,lfb,los,aon,spr,ack,st,sst,crc[2],sappdata[6],lappdata[130]; //All variable used 
+    flag=pc.getc();
+    psc=pc.getc();
+    data[0]=pc.getc(); //Data[0] contains APID,LFB,LoS,AoN,Spr and Ack
+    data[1]=pc.getc(); //Data[1] contains ST and SST
+    apid=(data[0]&0xC0)>>6;
+    lfb=(data[0]&0x20)>>5;
+    los=(data[0]&0x10)>>4;
+    aon=(data[0]&0x08)>>3;
+    spr=(data[0]&0x06)>>1;
+    ack=(data[0]&0x01);
+    st=(data[1]&0xF0)>>4;
+    sst=(data[1]&0x0F);
+    if(int(los)==0) {
+        for(int i=0; i<6; i++) {
+            sappdata[i]=pc.getc();
+        }
+    } 
+    else {
+        for(int i=0; i<130; i++) {
+            lappdata[i]=pc.getc();
+        }
+    }
+
+        crc[0]=pc.getc();
+        crc[1]=pc.getc();
+
+}
\ No newline at end of file
diff -r 000000000000 -r 81017b9a3647 mbed.bld
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Fri May 15 05:15:08 2015 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/dbbf35b96557
\ No newline at end of file