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TCP mode

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Mark Qvist 2014-04-28 17:47:32 +02:00
parent 8ba0ce4fad
commit f960709e82
10 changed files with 131 additions and 268 deletions
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59
Modem/protocol/mp1.h
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@ -5,7 +5,10 @@
#include <io/kfile.h>
// Options
#define MP1_ENABLE_COMPRESSION false
#define MP1_ENABLE_TCP_COMPATIBILITY true
#if MP1_ENABLE_TCP_COMPATIBILITY
#define MP1_ENABLE_COMPRESSION false
#endif
#define MP1_ENABLE_CSMA true
// Frame sizing & checksum
@ -13,7 +16,10 @@
#if MP1_ENABLE_COMPRESSION
#define MP1_MAX_FRAME_LENGTH 22 * MP1_INTERLEAVE_SIZE
#else
#define MP1_MAX_FRAME_LENGTH 56 * MP1_INTERLEAVE_SIZE
#define MP1_MAX_FRAME_LENGTH 25 * MP1_INTERLEAVE_SIZE
#define MP1_USE_TX_QUEUE true
#define MP1_TX_QUEUE_LENGTH 2
#define MP1_QUEUE_TX_WAIT 16UL
#endif
#define MP1_HEADER_SIZE 1
#define MP1_CHECKSUM_SIZE 1
@ -24,9 +30,10 @@
// These two parameters are used for
// P-persistent CSMA
#define MP1_SETTLE_TIME 250UL // The minimum wait time before considering sending
#define MP1_P_PERSISTENCE 64UL // The probability (between 0 and 255) for sending
#define MP1_TXDELAY 0UL // Delay between turning on the transmitter and sending
#define MP1_SETTLE_TIME 175UL // The minimum wait time before considering sending
#define MP1_SLOT_TIME 100UL // The time to wait if deciding not to send
#define MP1_P_PERSISTENCE 85UL // The probability (between 0 and 255) for sending
#define MP1_TXDELAY 0UL // Delay between turning on the transmitter and sending
// We need to know some basic HDLC flag bytes
#define HDLC_FLAG 0x7E
@ -50,23 +57,29 @@ typedef void (*mp1_callback_t)(struct MP1Packet *packet);
// Struct for a protocol context
typedef struct MP1 {
uint8_t buffer[MP1_MAX_FRAME_LENGTH]; // A buffer for incoming packets
uint8_t fecBuffer[3]; // Forward Error Correction buffer
KFile *modem; // KFile access to the modem
size_t packetLength; // Counter for received packet length
size_t readLength; // This is the full read length, including parity bytes
uint8_t calculatedParity; // Calculated parity for incoming data block
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
ticks_t settleTimer; // Timer used for carrier sense settling
long correctionsMade; // A counter for how many corrections were made to a packet
uint8_t interleaveCounter; // Keeps track of when we have received an entire interleaved block
uint8_t interleaveOut[MP1_INTERLEAVE_SIZE]; // A buffer for interleaving bytes before they are sent
uint8_t interleaveIn[MP1_INTERLEAVE_SIZE]; // A buffer for storing interleaved bytes before they are deinterleaved
uint8_t randomSeed; // A seed for the pseudo-random number generator
uint8_t buffer[MP1_MAX_FRAME_LENGTH+MP1_INTERLEAVE_SIZE]; // A buffer for incoming packets
KFile *modem; // KFile access to the modem
size_t packetLength; // Counter for received packet length
size_t readLength; // This is the full read length, including parity bytes
uint8_t calculatedParity; // Calculated parity for incoming data block
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
ticks_t settleTimer; // Timer used for carrier sense settling
long correctionsMade; // A counter for how many corrections were made to a packet
uint8_t interleaveCounter; // Keeps track of when we have received an entire interleaved block
uint8_t interleaveOut[MP1_INTERLEAVE_SIZE]; // A buffer for interleaving bytes before they are sent
uint8_t interleaveIn[MP1_INTERLEAVE_SIZE]; // A buffer for storing interleaved bytes before they are deinterleaved
uint8_t randomSeed; // A seed for the pseudo-random number generator
#if MP1_USE_TX_QUEUE
bool queueProcessing; // For sending queued frames without preamble after first one
size_t queueLength; // The length of the transmission queue
size_t frameLengths[MP1_TX_QUEUE_LENGTH]; // The lengths of the frames in the queue
uint8_t frameQueue[MP1_TX_QUEUE_LENGTH] // A buffer for a queued frame
[MP1_MAX_DATA_SIZE];
#endif
} MP1;
// A struct encapsulating a network packet
@ -80,6 +93,8 @@ void mp1Init(MP1 *mp1, KFile *modem, mp1_callback_t callback);
void mp1Read(MP1 *mp1, int byte);
void mp1Poll(MP1 *mp1);
void mp1Send(MP1 *mp1, void *_buffer, size_t length);
void mp1QueueFrame(MP1 *mp1, void *_buffer, size_t length);
void mp1ProcessQueue(MP1 *mp1);
bool mp1CarrierSense(MP1 *mp1);
int freeRam(void);