/*
* Function: commandShell(char *command)
* Parameters: None
* Returns: None
* Description: This functions behaves like shell answering all user commands
*/
void Server::commandShell(char *command) {
CommandID command_id = getCommandID(command);
switch(command_id) {
case COMMAND_HELP:
// handle help command
command_help();
break;
case COMMAND_CREATOR:
// handle CREATOR command
command_creator();
break;
case COMMAND_DISPLAY:
// handle DISPLAY command
command_display();
break;
case COMMAND_LIST:
// handle LIST command
command_list();
break;
default:
printf("Please enter a valid command \n");
printf("Type Help - to display supported commands \n");
break;
}
}
/**
* Liest ein Kommando ein, ist blockierend!
* Greift auf cmd_functions.read() zurueck
* Achtung, die Payload wird nicht mitgelesen!
*/
int8_t command_read(void) {
int16_t bytesRcvd;
int8_t start = 0; // Start des Kommandos
int8_t i;
command_t * command; // Pointer zum Casten der empfangegen Daten
uint8_t buffer[RCVBUFSIZE]; // Puffer
#ifdef PC
#if BYTE_ORDER == BIG_ENDIAN
uint16_t store; // Puffer fuer die Endian-Konvertierung
#endif
#endif // PC
#ifdef MCU
uint16_t old_ticks; // alte Systemzeit
#endif
buffer[0] = 0; // Sicherheitshalber mit sauberem Puffer anfangen
/* Daten holen, maximal soviele, wie ein Kommando lang ist */
const uint8_t n = sizeof(command_t);
bytesRcvd = cmd_functions.read(buffer, n);
if (bytesRcvd < 0) {
LOG_ERROR("command_read(): read() returned %d", bytesRcvd);
return -1;
}
#ifdef DEBUG_COMMAND_NOISY
LOG_DEBUG("%d read", bytesRcvd);
LOG_DEBUG("%x %x %x", buffer[0], buffer[1], buffer[2]);
#endif
/* Suche nach dem Beginn des Frames */
while ((start < bytesRcvd) && (buffer[start] != CMD_STARTCODE)) {
LOG_DEBUG("falscher Startcode: 0x%02x (should be 0x%02x), start=%d bytesRcvd=%d", buffer[start], CMD_STARTCODE, start, bytesRcvd);
start++;
}
/* Wenn keine STARTCODE gefunden ==> Daten verwerfen */
if (buffer[start] != CMD_STARTCODE) {
#ifdef DEBUG_COMMAND_NOISY
LOG_DEBUG("kein Startcode");
#endif
return -2;
}
#ifdef DEBUG_COMMAND_NOISY
LOG_DEBUG("Start @%d", start);
#endif
// haben wir noch genug Platz im Puffer, um das Packet ferig zu lesen?
if ((RCVBUFSIZE - (uint8_t) (start)) < n) {
LOG_DEBUG("not enough space");
return -3; // nein? ==> verwerfen
}
i = (int8_t) ((int8_t) n - (bytesRcvd - start));
if (i > 0) { // Fehlen noch Daten ?
LOG_DEBUG("Start @ %d es fehlen %d Bytes ", start, i);
#ifdef MCU
old_ticks = TIMER_GET_TICKCOUNT_16; // Systemzeit erfassen
#endif
/* So lange Daten lesen, bis das Packet vollstaendig ist, oder der Timeout zuschlaegt */
while (i > 0) {
#ifdef MCU
if (timer_ms_passed_16(&old_ticks, COMMAND_TIMEOUT)) {
/* Timeout ueberschritten */
LOG_DEBUG("Timeout beim Nachlesen");
return -4; // ==> Abbruch
}
#endif // MCU
LOG_DEBUG("%d Bytes missing", i);
i = (int8_t) cmd_functions.read(buffer + bytesRcvd, i);
LOG_DEBUG("%d read", i);
bytesRcvd = bytesRcvd + i;
i = (int8_t) ((int8_t) n - (bytesRcvd - start));
}
}
#ifdef DEBUG_COMMAND_NOISY
LOG_DEBUG("%d/%d read/start", bytesRcvd, start);
LOG_DEBUG("%x %x %x", buffer[start], buffer[start+1], buffer[start+2]);
#endif
command = (command_t *) (buffer + start); // Cast in command_t
#ifdef DEBUG_COMMAND_NOISY
LOG_DEBUG("start: %c ", command->startCode);
// command_display(command);
#endif
// validate (Startcode ist bereits ok, sonst waeren wir nicht hier)
if (command->CRC == CMD_STOPCODE) {
#ifdef DEBUG_COMMAND_NOISY
LOG_DEBUG("Command is valid");
#endif
#ifdef CRC_CHECK
if (! cmd_functions.crc_check(command)) {
LOG_ERROR("CRC ungueltig:");
#ifdef DEBUG_COMMAND
command_display(command);
#endif
memcpy(&received_command, command, sizeof(command_t));
return -20;
} else {
#ifdef DEBUG_COMMAND_NOISY
LOG_DEBUG("CRC korrekt");
#endif // DEBUG_COMMAND_NOISY
}
#endif // CRC_CHECK
#ifdef CHECK_CMD_ADDRESS
/* Ist das Paket ueberhaupt fuer uns? */
if ((command->to != CMD_BROADCAST) && (command->to != CMD_IGNORE_ADDR) && (command->to != get_bot_address()) && (command->request.command != CMD_WELCOME)) {
LOG_DEBUG("Fehler: Paket To= %d statt %u", command->to, get_bot_address());
#ifdef LOG_AVAILABLE
command_display(command);
#endif
return -10;
}
#endif // CHECK_CMD_ADDRESS
// Transfer
memcpy(&received_command, command, sizeof(command_t));
#ifdef PC
#if BYTE_ORDER == BIG_ENDIAN
/* Umwandeln der 16 bit Werte in Big Endian */
store = received_command.data_l;
received_command.data_l = store << 8;
received_command.data_l |= (store >> 8) & 0xff;
store = received_command.data_r;
received_command.data_r = store << 8;
received_command.data_r |= (store >> 8) & 0xff;
#endif // BYTE_ORDER == BIG_ENDIAN
#endif // PC
#ifdef DEBUG_COMMAND_NOISY
LOG_DEBUG("Command received:");
command_display(&received_command);
#endif
return 0;
} else { // Command not valid
