Revision 0:81017b9a3647, committed 2015-05-15

Comitter:

cholletisaik777

Date:

Fri May 15 05:15:08 2015 +0000

Commit message:

telecommand decoding

Changed in this revision

--- /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

--- /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