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message.c
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message.c
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/********************************************************
** message.c
**
** Packet conversion to message
**
********************************************************/
#include <string.h>
#include <stdio.h>
#include <avr/interrupt.h>
#include <avr/pgmspace.h>
#include "config.h"
#include "trace.h"
#include "frame.h"
#include "message.h"
#define DEBUG_MSG(_v) DEBUG4(_v)
/********************************************************
** Message status
********************************************************/
enum message_state {
S_START,
S_HEADER,
S_ADDR0,
S_ADDR1,
S_ADDR2,
S_PARAM0,
S_PARAM1,
S_OPCODE,
S_LEN,
S_PAYLOAD,
S_CHECKSUM,
S_TRAILER,
S_COMPLETE,
S_ERROR
};
#define F_MASK 0x03
#define F_RQ 0x00
#define F_I 0x01
#define F_W 0x02
#define F_RP 0x03
#define F_ADDR0 0x10
#define F_ADDR1 0x20
#define F_ADDR2 0x40
#define F_PARAM0 0x04
#define F_PARAM1 0x08
#define F_RSSI 0x80
// Only used for received fields
#define F_OPCODE 0x01
#define F_LEN 0x02
#define MAX_RAW 162
#define MAX_PAYLOAD 64
struct message {
uint8_t state;
uint8_t count;
uint8_t fields; // Fields specified in header
uint8_t rxFields; // Fields actually received
uint8_t error;
uint8_t addr[3][3];
uint8_t param[2];
uint8_t opcode[2];
uint8_t len;
uint8_t csum;
uint8_t rssi;
uint8_t nPayload;
uint8_t payload[MAX_PAYLOAD];
uint8_t nBytes;
uint8_t raw[MAX_RAW];
};
static void msg_reset( struct message *msg ) {
if( msg != NULL ) {
memset( msg, 0, sizeof(*msg) );
}
}
/********************************************************
** Message lists
********************************************************/
#define N_MSG 4
#define N_LIST ( N_MSG+1 ) // Queues are bigger than total number of messsages so can never be full
struct msg_list {
struct message *msg[N_LIST];
uint8_t in;
uint8_t out;
};
static void msg_put( struct msg_list *list, struct message **ppMsg, uint8_t reset ) {
if( ppMsg != NULL ) {
struct message *pMsg = (*ppMsg);
if( pMsg != NULL ) {
if( reset )
msg_reset( pMsg );
list->msg[list->in] = pMsg;
list->in = ( list->in + 1 ) % N_LIST;
(*ppMsg) = NULL;
}
}
}
static struct message *msg_get( struct msg_list *list ) {
struct message *msg = list->msg[ list->out ];
if( msg != NULL ) {
list->msg[list->out] = NULL;
list->out = ( list->out+1 ) % N_LIST;
msg->state = S_START;
}
return msg;
}
/********************************************************
** Message structure pool
********************************************************/
static struct msg_list msg_pool;
void msg_free( struct message **msg ) { msg_put( &msg_pool, msg, 1 ); }
struct message *msg_alloc(void) { return msg_get( &msg_pool); }
static void msg_create_pool(void) {
static struct message MSG[N_MSG];
uint8_t i;
for( i=0 ; i<N_MSG ; i++ ) {
struct message *msg = &MSG[i];
msg_free( &msg );
}
}
/********************************************************
** Received Message list
********************************************************/
static struct msg_list rx_list;
void msg_rx_ready( struct message **msg ) { msg_put( &rx_list, msg, 0 ); }
struct message *msg_rx_get(void) { return msg_get( &rx_list ); }
/********************************************************
** Transmit Message list
********************************************************/
static struct msg_list tx_list;
void msg_tx_ready( struct message **msg ) { msg_put( &tx_list, msg, 0 ); }
static struct message *msg_tx_get(void) { return msg_get( &tx_list ); }
/********************************************************
** Message Header
********************************************************/
static char const * const MsgType[4] = { "RQ", "I","W","RP" };
#define F_OPTION ( F_ADDR0 + F_ADDR1 + F_ADDR2 + F_PARAM0 + F_PARAM1 )
#define F_MAND ( F_OPCODE + F_LEN )
static const uint8_t address_flags[4] = {
F_ADDR0+F_ADDR1+F_ADDR2 ,
F_ADDR2 ,
F_ADDR0+ F_ADDR2 ,
F_ADDR0+F_ADDR1
};
#define HDR_T_MASK 0x30
#define HDR_T_SHIFT 4
#define HDR_A_MASK 0x0C
#define HDR_A_SHIFT 2
#define HDR_PARAM0 0x02
#define HDR_PARAM1 0x01
static uint8_t get_hdr_flags(uint8_t header ) {
uint8_t flags;
flags = ( header & HDR_T_MASK ) >> HDR_T_SHIFT; // Message type
flags |= address_flags[ ( header & HDR_A_MASK ) >> HDR_A_SHIFT ];
if( header & HDR_PARAM0 ) flags |= F_PARAM0;
if( header & HDR_PARAM1 ) flags |= F_PARAM1;
return flags;
}
static uint8_t get_header( uint8_t flags ) __attribute__((unused));
static uint8_t get_header( uint8_t flags ) {
uint8_t i;
uint8_t header = 0xFF;
uint8_t addresses = flags & ( F_ADDR0+F_ADDR1+F_ADDR2 );
for( i=0 ; i<sizeof(address_flags) ; i++ ) {
if( addresses==address_flags[i] ) {
header = i << HDR_A_SHIFT;
header |= ( flags & F_MASK ) << HDR_T_SHIFT; // Message type
if( flags & F_PARAM0 ) header |= HDR_PARAM0;
if( flags & F_PARAM1 ) header |= HDR_PARAM1;
break;
}
}
return header;
}
/********************************************************
** General utilities
********************************************************/
static uint8_t msg_checksum( struct message *msg ) {
uint8_t csum;
uint8_t i,j;
// Missing fields will be zero so we can just add them to checksum without testing presence
{ csum = get_header(msg->fields); }
for( i=0 ; i<3 ; i++ ) { for( j=0 ; j<3 ; j++ ) { csum += msg->addr[i][j]; } }
for( i=0 ; i<2 ; i++ ) { csum += msg->param[i]; }
for( i=0 ; i<2 ; i++ ) { csum += msg->opcode[i]; }
{ csum += msg->len; }
for( i=0 ; i<msg->nPayload ; i++ ) { csum += msg->payload[i]; }
return -csum;
}
static void msg_set_address( uint8_t *addr, uint8_t class, uint32_t id ) {
addr[0] = ( ( class<< 2 ) & 0xFC ) | ( ( id >> 16 ) & 0x03 );
addr[1] = ( ( id >> 8 ) & 0xFF );
addr[2] = ( ( id ) & 0xFF );
}
static void msg_get_address( uint8_t *addr, uint8_t *class, uint32_t *id ) {
uint8_t Class = ( addr[0] & 0xFC ) >> 2;
uint32_t Id = (uint32_t)( addr[0] & 0x03 ) << 16
| (uint32_t)( addr[1] ) << 8
| (uint32_t)( addr[2] ) ;
if( class ) (*class) = Class;
if( id ) (*id ) = Id;
}
/********************************************************
** Message Print
********************************************************/
static uint8_t msg_print_rssi( char *str, uint8_t rssi, uint8_t valid ) {
uint8_t n = 0;
if( valid ) {
n = sprintf_P(str, PSTR("%03u "), rssi );
} else {
n = sprintf_P(str, PSTR("--- "));
}
return n;
}
static uint8_t msg_print_type( char *str, uint8_t type ) {
uint8_t n = 0;
n = sprintf_P( str,PSTR("%2s "),MsgType[type] );
return n;
}
static uint8_t msg_print_addr( char *str, uint8_t *addr, uint8_t valid ) {
uint8_t n = 0;
if( valid ) {
uint8_t class;
uint32_t id;
msg_get_address( addr, &class,&id );
n = sprintf_P(str, PSTR("%02hu:%06lu "), class, id );
} else {
n = sprintf_P(str, PSTR("--:------ "));
}
return n;
}
static uint8_t msg_print_param( char *str, uint8_t param, uint8_t valid ) {
uint8_t n = 0;
if( valid ) {
n = sprintf_P(str, PSTR("%03u "), param );
} else {
n = sprintf_P(str, PSTR("--- "));
}
return n;
}
static uint8_t msg_print_opcode( char *str, uint8_t *opcode, uint8_t valid ) {
uint8_t n = 0;
if( valid ) {
n = sprintf_P( str, PSTR("%02X%02X "), opcode[0],opcode[1] );
} else {
n= sprintf_P(str, PSTR("???? "));
}
return n;
}
static uint8_t msg_print_len( char *str, uint8_t len, uint8_t valid ) {
uint8_t n = 0;
if( valid ) {
n = sprintf_P(str, PSTR("%03u "), len );
} else {
n = sprintf_P(str, PSTR("??? "));
}
return n;
}
static uint8_t msg_print_payload( char *str, uint8_t payload ) {
uint8_t n=0;
n = sprintf_P( str,PSTR("%02X"),payload );
return n;
}
static uint8_t msg_print_error( char *str, uint8_t error ) {
static char const msg_err_OK[] PROGMEM = "" ;
static char const msg_err_UNKNOWN[] PROGMEM = "UNKNOWN" ;
#define _MSG_ERR(_e,_t) static char const msg_err_ ## _e[] PROGMEM = _t ;
_MSG_ERR_LIST
#undef _MSG_ERR
#define _MSG_ERR(_e,_t) , msg_err_ ## _e
static char const *const msg_err[MSG_ERR_MAX+1] PROGMEM = { msg_err_OK _MSG_ERR_LIST, msg_err_UNKNOWN };
#undef _MSG_ERR
uint8_t n;
if( error ) {
if( error>MSG_ERR_MAX ) error = MSG_ERR_MAX;
n = sprintf_P( str, PSTR(" * %S\r\n"), (PGM_P)pgm_read_word( msg_err + error ) );
} else {
n = sprintf_P(str,PSTR("\r\n"));
}
return n;
}
static uint8_t msg_print_raw( char *str, uint8_t raw, uint8_t i ) {
uint8_t n = 0;
if( i )
n = sprintf_P( str,PSTR("%02X."),raw );
else
n = sprintf_P( str,PSTR("# %02X."),raw );
return n;
}
static uint8_t msg_print_bytes( char *str, uint8_t raw, uint8_t i ) {
uint8_t n = 0;
if( i )
n = sprintf_P( str,PSTR("%c"),raw );
else
n = sprintf_P( str,PSTR("# %c"),raw );
return n;
}
/************************************************************************************
**
** msg_print_field
**
** get the next buffer of output text
**/
static uint8_t msg_print_field( struct message *msg, char *buff ) {
uint8_t nBytes = 0;
switch( msg->state ) {
case S_START:
nBytes = msg_print_rssi( buff, msg->rssi, msg->rxFields&F_RSSI );
msg->state = S_HEADER;
if( nBytes )
break;
/* fallthrough */
case S_HEADER:
nBytes = msg_print_type( buff, msg->fields & F_MASK );
msg->state = S_PARAM0;
if( nBytes )
break;
/* fallthrough */
case S_PARAM0:
nBytes = msg_print_param( buff, msg->param[0], msg->rxFields&F_PARAM0 );
msg->state = S_ADDR0;
if( nBytes )
break;
/* fallthrough */
case S_ADDR0:
nBytes = msg_print_addr( buff, msg->addr[0], msg->rxFields&F_ADDR0 );
msg->state = S_ADDR1;
if( nBytes )
break;
/* fallthrough */
case S_ADDR1:
nBytes = msg_print_addr( buff, msg->addr[1], msg->rxFields&F_ADDR1 );
msg->state = S_ADDR2;
if( nBytes )
break;
/* fallthrough */
case S_ADDR2:
nBytes = msg_print_addr( buff, msg->addr[2], msg->rxFields&F_ADDR2 );
msg->state = S_OPCODE;
if( nBytes )
break;
/* fallthrough */
case S_OPCODE:
nBytes = msg_print_opcode( buff, msg->opcode, msg->rxFields&F_OPCODE );
msg->state = S_LEN;
if( nBytes )
break;
/* fallthrough */
case S_LEN:
nBytes = msg_print_len( buff, msg->len, msg->rxFields&F_LEN );
msg->state = S_PAYLOAD;
if( nBytes )
break;
/* fallthrough */
case S_PAYLOAD:
// Multi buffer field
if( msg->count < msg->nPayload ) {
nBytes = msg_print_payload( buff, msg->payload[msg->count++] );
if( nBytes )
break;
}
msg->count = 0;
msg->state = S_ERROR;
/* fallthrough */
case S_ERROR:
// This always includes "\r\n"
nBytes = msg_print_error( buff, msg->error );
msg->state = S_TRAILER;
if( nBytes )
break;
/* fallthrough */
case S_TRAILER: // Don't print trailer, use state for raw data
// Multi buffer field
if( msg->error || TRACE(TRC_RAW) ){
if( msg->count < msg->nBytes ) {
if( msg->rxFields&F_RSSI )
nBytes = msg_print_raw( buff, msg->raw[msg->count], msg->count );
else
nBytes = msg_print_bytes( buff, msg->raw[msg->count], msg->count );
msg->count++;
} else if( msg->nBytes ) {
nBytes = sprintf_P( buff, PSTR("\r\n") );
msg->state = S_COMPLETE;
}
if( nBytes )
break;
}
msg->count = 0;
msg->state = S_COMPLETE;
/* fallthrough */
case S_COMPLETE:
break;
}
return nBytes;
}
/************************************************************************************
**
** msg_print
**
** Called repeatedly from msg_work.
** Neither this function or any it calls must block or delay
**
** Acquires a buffer of output and tries to send it to the serial port
** If it's not transferred this time, try again until it goes.
**
** Keep getting more buffers until we get a zero length buffer
**
** We can re-use some of the working fields from struct message to control
** progress
**/
uint8_t msg_print( struct message *msg, char *msg_buff ) {
uint8_t n;
if( msg->state == S_START ) {
DEBUG_MSG(1);
msg->count = 0;
}
n = msg_print_field( msg, msg_buff );
if( msg->state == S_COMPLETE )
DEBUG_MSG(0);
return n;
}
/********************************************************
** RX Message processing
********************************************************/
static uint8_t msg_rx_header( struct message *msg, uint8_t byte ) {
uint8_t state = S_ADDR0;
msg->fields = get_hdr_flags( byte );
return state;
}
static uint8_t msg_rx_addr( struct message *msg, uint8_t addr, uint8_t byte ) {
uint8_t state = S_ADDR0 + addr;
msg->addr[addr][msg->count++] = byte;
if( msg->count==sizeof( msg->addr[0] ) ) {
msg->count = 0;
state += 1;
msg->rxFields |= F_ADDR0 << addr;
}
return state;
}
static uint8_t msg_rx_param( struct message *msg, uint8_t param, uint8_t byte ) {
uint8_t state = S_PARAM0 + param;
msg->param[param] = byte;
state += 1;
msg->rxFields |= F_PARAM0 << param;
return state;
}
static uint8_t msg_rx_opcode( struct message *msg, uint8_t byte ) {
uint8_t state = S_OPCODE;
msg->opcode[msg->count++] = byte;
if( msg->count==sizeof( msg->opcode ) ) {
msg->count = 0;
state += 1;
msg->rxFields |= F_OPCODE ;
}
return state;
}
static uint8_t msg_rx_len( struct message *msg, uint8_t byte ) {
uint8_t state = S_LEN;
msg->len = byte;
state += 1;
msg->rxFields |= F_LEN;
return state;
}
static uint8_t msg_rx_payload( struct message *msg, uint8_t byte ) {
uint8_t state = S_PAYLOAD;
if( msg->nPayload < MAX_PAYLOAD ) {
msg->payload[msg->nPayload++] = byte;
}
msg->count++;
if( msg->count==msg->len ) {
msg->count = 0;
state = S_CHECKSUM;
}
return state;
}
static uint8_t msg_rx_checksum( struct message *msg, uint8_t byte __attribute__((unused))) {
uint8_t state = S_COMPLETE;
if( msg->csum != 0 && !msg->error )
msg->error = MSG_CSUM_ERR;
return state;
}
static struct message *msgRx;
static void msg_rx_process(uint8_t byte) {
msgRx->csum += byte;
switch( msgRx->state ) {
case S_START: // not processed here - fallthrough
case S_HEADER: { msgRx->state = msg_rx_header( msgRx, byte ); break; }
case S_ADDR0: if( msgRx->fields & F_ADDR0 ) { msgRx->state = msg_rx_addr( msgRx, 0, byte ); break; } /* fallthrough */
case S_ADDR1: if( msgRx->fields & F_ADDR1 ) { msgRx->state = msg_rx_addr( msgRx, 1, byte ); break; } /* fallthrough */
case S_ADDR2: if( msgRx->fields & F_ADDR2 ) { msgRx->state = msg_rx_addr( msgRx, 2, byte ); break; } /* fallthrough */
case S_PARAM0: if( msgRx->fields & F_PARAM0 ) { msgRx->state = msg_rx_param( msgRx, 0, byte ); break; } /* fallthrough */
case S_PARAM1: if( msgRx->fields & F_PARAM1 ) { msgRx->state = msg_rx_param( msgRx, 1, byte ); break; } /* fallthrough */
case S_OPCODE: { msgRx->state = msg_rx_opcode( msgRx, byte ); break; }
case S_LEN: { msgRx->state = msg_rx_len( msgRx, byte ); break; }
case S_PAYLOAD: { msgRx->state = msg_rx_payload( msgRx, byte ); break; }
case S_CHECKSUM: { msgRx->state = msg_rx_checksum( msgRx, byte ); break; }
}
}
void msg_rx_rssi( uint8_t rssi ) {
msgRx->rssi = rssi;
msgRx->rxFields |= F_RSSI;
}
uint8_t *msg_rx_start(void) {
uint8_t *raw = NULL;
DEBUG_MSG(1);
msgRx = msg_alloc();
if( msgRx ) {
raw = msgRx->raw;
raw[0] = MAX_RAW;
}
DEBUG_MSG(0);
return raw;
}
uint8_t msg_rx_byte( uint8_t byte ) {
DEBUG_MSG(1);
msg_rx_process( byte );
DEBUG_MSG(0);
return msgRx->error;
}
void msg_rx_end( uint8_t nBytes, uint8_t error ) {
DEBUG_MSG(1);
msgRx->nBytes = nBytes;
if( error==MSG_OK ) {
// All optional fields received as expected?
if( ( ( msgRx->rxFields & F_OPTION ) != ( msgRx->fields & F_OPTION ) )
|| ( ( msgRx->rxFields & F_MAND ) != F_MAND )
|| ( msgRx->len != msgRx->nPayload ) ) {
error = MSG_TRUNC_ERR;
}
}
msgRx->error = error;
msg_rx_ready( &msgRx );
DEBUG_MSG(0);
}
/********************************************************
** TX Message scan
********************************************************/
static uint8_t msg_scan_header( struct message *msg, char *str, uint8_t nChar ) {
uint8_t ok = 0;
uint8_t msgType;
// Cheap conversion to upper for acceptable characters
while( --nChar )
str[ nChar-1 ] &= ~( 'A'^'a' );
for( msgType=F_RQ ; msgType<=F_RP ; msgType++ ) {
if( 0==strcmp( str, MsgType[msgType] ) ) {
msg->fields = msgType;
ok = 1;
break;
}
}
return ok;
}
void msg_change_addr( struct message *msg, uint8_t addr, uint8_t Class,uint32_t Id , uint8_t myClass,uint32_t myId ) {
if( msg && ( msg->fields & ( F_ADDR0 << addr ) ) ) { // Message contains specified address field
uint8_t *Addr = msg->addr[addr];
uint8_t class;
uint32_t id;
msg_get_address( Addr, &class, &id );
if( class==Class && id==Id ) // address matches
msg_set_address( Addr, myClass, myId );
}
}
static uint8_t msg_scan_addr( struct message *msg, char *str, uint8_t nChar ) {
uint8_t ok = 0;
uint8_t addr = msg->state - S_ADDR0;
if( str[0]!='-' ) {
uint8_t class;
uint32_t id;
if( nChar<11 && 2==sscanf( str, "%hhu:%lu", &class, &id ) ) {
msg_set_address( msg->addr[addr], class, id );
msg->fields |= F_ADDR0 << addr;
ok = 1;
}
} else {
ok = 1;
}
return ok;
}
static uint8_t msg_scan_param( struct message *msg, char *str, uint8_t nChar ) {
uint8_t ok = 0;
uint8_t param = msg->state - S_PARAM0;
if( str[0]!='-' ) {
if( nChar<5 && 1==sscanf( str, "%hhu", msg->param+param ) ) {
msg->fields |= F_PARAM0 << param;
ok = 1;
}
} else {
ok = 1;
}
return ok;
}
static uint8_t msg_scan_opcode( struct message *msg, char *str, uint8_t nChar ) {
uint8_t ok = 0;
if( nChar==5 && 2==sscanf( str, "%02hhx%02hhx", msg->opcode+0,msg->opcode+1 ) ) {
msg->rxFields |= F_OPCODE;
ok = 1;
}
return ok;
}
static uint8_t msg_scan_len( struct message *msg, char *str, uint8_t nChar ) {
uint8_t ok = 0;
if( nChar<5 && 1==sscanf( str, "%hhu", &msg->len ) ) {
if( msg->len > 0 && msg->len <= MAX_PAYLOAD )
{
msg->rxFields |= F_LEN;
ok = 1;
}
}
return ok;
}
static uint8_t msg_scan_payload( struct message *msg, char *str, uint8_t nChar ) {
uint8_t ok=0;
if( nChar==3 && 1==sscanf( str, "%02hhx", msg->payload+msg->nPayload ) )
{
msg->nPayload++;
ok = 1;
}
return ok;
}
uint8_t msg_scan( struct message *msg, uint8_t byte ) {
static char field[17];
static uint8_t nChar=0;
uint8_t ok = 1;
if( byte=='\n' ) return 0; // Discard newline
if( byte=='\r' ) {
// Ignore blank line
if( msg->state==S_START && nChar==0 )
return 0;
// Didn't get a sensible message
if( msg->state != S_CHECKSUM ) {
nChar = 0;
msg->rxFields |= msg->fields;
msg->error = MSG_BAD_TX;
return 1;
} else {
byte = '\0';
}
}
if( msg->nBytes<MAX_RAW )
msg->raw[msg->nBytes++] = byte;
// Discard to end of line
if( msg->state == S_ERROR )
return 0;
if( byte==' ' ) {
// Discard leading spaces
if( nChar==0 )
return 0;
// Terminate field
byte = '\0';
}
field[ nChar++ ] = (char)byte;
// No spaces between PAYLOAD bytes
if( byte && msg->state == S_PAYLOAD ) {
if( nChar==2 ) {
field[nChar++] = '\0';
ok = msg_scan_payload( msg, field, nChar );
if( ok ) {
nChar = 0;
if( msg->nPayload == msg->len ) {
msg->state = S_CHECKSUM;
}
}
} else { // wait for second byte
return 0;
}
}
if( !byte ) {
switch( msg->state ) {
case S_START: /* fall through */
case S_HEADER: ok=msg_scan_header( msg, field, nChar ); msg->state = S_PARAM0; break;
case S_ADDR0: ok=msg_scan_addr( msg, field, nChar ); msg->state = S_ADDR1; break;
case S_ADDR1: ok=msg_scan_addr( msg, field, nChar ); msg->state = S_ADDR2; break;
case S_ADDR2: ok=msg_scan_addr( msg, field, nChar ); msg->state = S_OPCODE; break;
case S_PARAM0: ok=msg_scan_param( msg, field, nChar ); msg->state = S_ADDR0; break;
// case S_PARAM1:
case S_OPCODE: ok=msg_scan_opcode( msg, field, nChar ); msg->state = S_LEN; break;
case S_LEN: ok=msg_scan_len( msg, field, nChar ); msg->state = S_PAYLOAD; break;
case S_PAYLOAD: msg->state = S_ERROR; break;
case S_CHECKSUM: msg->state = ( nChar!=1 ) ? S_ERROR : S_COMPLETE; break;
// case S_TRAILER:
// case S_COMPLETE:
// case S_ERROR:
}
nChar = 0;
}
if( !ok )
msg->state = S_ERROR;
if( msg->state==S_PAYLOAD ) {
if( ( msg->rxFields & F_MAND ) != F_MAND ) {
msg->state = S_ERROR;
}
}
if( msg->state==S_COMPLETE ) {
msg->rxFields |= msg->fields;
return 1;
}
return 0;
}
/********************************************************
** TX Message
********************************************************/
static uint8_t msg_tx_header( struct message *msg, uint8_t *done ) {
uint8_t byte = 0;
if( msg->count < 1 ) {
byte = get_header( msg->fields );
msg->count++;
} else {
msg->count = 0;
}
(*done) = (msg->count) ? 0:1;
return byte;
}
static uint8_t msg_tx_addr( struct message *msg, uint8_t *done ) {
uint8_t byte = 0;
uint8_t addr = msg->state - S_ADDR0;
if( msg->fields & ( F_ADDR0 << addr ) ) {
if( msg->count < 3 ) {
byte = msg->addr[ addr ][ msg->count ];
msg->count++;
} else {
msg->count = 0;
}
}
(*done) = (msg->count) ? 0:1;
return byte;
}
static uint8_t msg_tx_param( struct message *msg, uint8_t *done ) {
uint8_t byte = 0;
uint8_t param = msg->state - S_PARAM0;
if( msg->fields & ( F_PARAM0 << param ) ) {
if( msg->count < 1 ) {
byte = msg->param[ param ];
msg->count++;
} else {
msg->count = 0;
}
}
(*done) = (msg->count) ? 0:1;
return byte;
}
static uint8_t msg_tx_opcode( struct message *msg, uint8_t *done ) {
uint8_t byte = 0;
if( msg->count < 2 ) {
byte = msg->opcode[ msg->count ];
msg->count++;
} else {
msg->count = 0;
}
(*done) = (msg->count) ? 0:1;
return byte;
}
static uint8_t msg_tx_len( struct message *msg, uint8_t *done ) {
uint8_t byte = 0;
if( msg->count < 1 ) {
byte = msg->len;
msg->count++;
} else {
msg->count = 0;
}
(*done) = (msg->count) ? 0:1;
return byte;
}
static uint8_t msg_tx_payload( struct message *msg, uint8_t *done ) {
uint8_t byte = 0;
if( msg->count < msg->len ) {
byte = msg->payload[ msg->count ];
msg->count++;
} else {
msg->count = 0;
}
(*done) = (msg->count) ? 0:1;
return byte;
}
static uint8_t msg_tx_checksum( struct message *msg, uint8_t *done ) {
uint8_t byte = 0;
if( msg->count < 1 ) {
byte = msg->csum;
msg->count++;
} else {
msg->count = 0;
}
(*done) = (msg->count) ? 0:1;
return byte;
}
static uint8_t msg_tx_process( struct message *msg, uint8_t *done ) {
uint8_t byte = 0, d=1;
switch( msg->state ) {
case S_START:
case S_HEADER: byte = msg_tx_header(msg,&d); if( !d )break; msg->state = S_ADDR0; /* fall through */
case S_ADDR0: byte = msg_tx_addr(msg,&d); if( !d )break; msg->state = S_ADDR1; /* fall through */
case S_ADDR1: byte = msg_tx_addr(msg,&d); if( !d )break; msg->state = S_ADDR2; /* fall through */
case S_ADDR2: byte = msg_tx_addr(msg,&d); if( !d )break; msg->state = S_PARAM0; /* fall through */
case S_PARAM0: byte = msg_tx_param(msg,&d); if( !d )break; msg->state = S_PARAM1; /* fall through */
case S_PARAM1: byte = msg_tx_param(msg,&d); if( !d )break; msg->state = S_OPCODE; /* fall through */