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Implemented checksumming

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This commit is contained in:
Mark Qvist 2014-04-04 17:05:53 +02:00
parent b350d3cd8c
commit 0c4bc75be9
6 changed files with 67 additions and 16 deletions
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7
Modem/protocol/mp1.h
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@ -4,9 +4,10 @@
#include <cfg/compiler.h>
#include <io/kfile.h>
// Frame sizing
#define MP1_MIN_FRAME_LENGTH 1
// Frame sizing & checksum
#define MP1_MIN_FRAME_LENGTH 3
#define MP1_MAX_FRAME_LENGTH 300
#define MP1_CHECKSUM_INIT 0xAA
// We need to know some basic HDLC flag bytes
#define HDLC_FLAG 0x7E
@ -26,6 +27,8 @@ typedef struct MP1 {
KFile *modem; // KFile access to the modem
size_t packetLength; // Counter for received packet length
mp1_callback_t callback; // The function to call when a packet has been received
uint8_t checksum_in; // Rolling checksum for incoming packets
uint8_t checksum_out; // Rolling checksum for outgoing packets
bool reading; // True when we have seen a HDLC flag
bool escape; // We need to know if we are in an escape sequence
} MP1;