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CubeSatSim
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Alan Johnston 7 years ago
parent d6c16123aa
commit d902e4b159
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116
piglatin/.cproject
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/Debug/

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piglatin/.project
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piglatin/.settings/org.eclipse.cdt.managedbuilder.core.prefs
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eclipse.preferences.version=1
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piglatin/piglatin_main.c
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// Copyright (c) 2018 Brandenburg Tech, LLC
// All right reserved.
//
// THIS SOFTWARE IS PROVIDED BY BRANDENBURG TECH, LLC AND CONTRIBUTORS
// ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
// PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BRANDENBURT TECH, LLC
// AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
// OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include <axradio/axradioinit_p.h>
#include <axradio/axradiomode_p.h>
#include <axradio/axradiorx_p.h>
#include <axradio/axradiotx_p.h>
#include <ctype.h>
#include <generated/configtx.h>
#include <spi/ax5043spi_p.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define FALSE (0)
#define TRUE (1)
#define MAX_MESSAGE_LENGTH (197)
#define MAX_INPUT_LENGTH (1024)
#define MAX_WORD_LENGTH (192)
extern uint8_t axradio_rxbuffer[];
void receive(void);
void transmit(uint8_t *word, size_t length);
void toPigLatin(uint8_t *input);
void readWord(uint8_t *word, unsigned int wordLength, uint8_t **input);
void wordToPigLatin(uint8_t *word, unsigned int wordLength);
void wordToPigLatinVowel(uint8_t *word, unsigned int srcLoc, uint8_t workWord[],
unsigned int destLoc, unsigned int wordLength);
void wordToPigLatinConsonant(uint8_t firstLetter, uint8_t *word, unsigned int srcLoc,
uint8_t *workWord, unsigned int destLoc, unsigned int wordLength);
enum RadioState {UnknownState, RxState, TxState};
enum RadioState currentState = UnknownState;
enum ReceiveState {WaitingForNewPacket, WaitingForPacketCounter1,
WaitingForPacketCounter2, WaitingForMessageLength1,
WaitingForMessageLength2, WaitingForMessage,
WaitingForChecksum1, WaitingForChecksum2};
int main(void)
{
uint8_t retVal;
// Configure SPI bus to AX5043
setSpiChannel(SPI_CHANNEL);
setSpiSpeed(SPI_SPEED);
initializeSpi();
// Initialize the AX5043
retVal = axradio_init();
if (retVal == AXRADIO_ERR_NOCHIP) {
fprintf(stderr, "ERROR: No AX5043 RF chip found\n");
exit(EXIT_FAILURE);
}
if (retVal != AXRADIO_ERR_NOERROR) {
fprintf(stderr, "ERROR: Unable to initialize AX5043\n");
exit(EXIT_FAILURE);
}
printf("INFO: Found and initialized AX5043\n");
printf("This utility receives text from another transmitter,\n");
printf("translates it to pig Latin, then transmits the translation\n");
receive();
return 0;
}
void receive(void) {
uint8_t retVal;
uint16_t packetNumber;
uint16_t messageLength;
uint16_t checksum;
uint8_t ch;
// Allocate space for the translation. I'm choosing to use an array of
// "reasonable" length
uint8_t input[MAX_INPUT_LENGTH];
uint16_t currentLetter = 0;
input[currentLetter] = '\0';
enum ReceiveState currentReceiveState = WaitingForNewPacket;
for (;;) {
// Enter receive mode only if not already in receive mode
if (currentState != RxState) {
retVal = mode_rx();
if (retVal != AXRADIO_ERR_NOERROR) {
fprintf(stderr, "ERROR: Unable to enter RX mode\n");
exit(EXIT_FAILURE);
}
currentState = RxState;
}
retVal = receive_packet();
if (retVal > 0) {
uint8_t counter = 0;
while (retVal-- > 0) {
switch(currentReceiveState) {
case WaitingForNewPacket:
printf("Pkt Len: %d\n", (int)axradio_rxbuffer[counter++]);
currentReceiveState = WaitingForPacketCounter1;
break;
case WaitingForPacketCounter1:
packetNumber = (int)axradio_rxbuffer[counter++];
currentReceiveState = WaitingForPacketCounter2;
break;
case WaitingForPacketCounter2:
packetNumber |= (uint16_t)(axradio_rxbuffer[counter++] << 8);
printf("Pkt Num: %d\n", (int)packetNumber);
currentReceiveState = WaitingForMessageLength1;
break;
case WaitingForMessageLength1:
messageLength = (int)axradio_rxbuffer[counter++];
currentReceiveState = WaitingForMessageLength2;
break;
case WaitingForMessageLength2:
messageLength |= (uint16_t)(axradio_rxbuffer[counter++] << 8);
printf("Msg Len: %d\n", (int)messageLength);
currentReceiveState = WaitingForMessage;
currentLetter = 0;
input[currentLetter] = '\0';
printf("receive: ");
break;
case WaitingForMessage:
ch = axradio_rxbuffer[counter++];
input[currentLetter] = ch;
currentLetter++;
input[currentLetter] = '\0';
if (ch != '\n') {
printf("%c", ch);
}
else {
//printf(" ");
printf("\n");
toPigLatin(input);
currentReceiveState = WaitingForChecksum1;
}
break;
case WaitingForChecksum1:
checksum = (int)axradio_rxbuffer[counter++];
currentReceiveState = WaitingForChecksum2;
break;
case WaitingForChecksum2:
checksum |= (uint16_t)(axradio_rxbuffer[counter++] << 8);
printf("Chksum: %d\n", (int)checksum);
currentReceiveState = WaitingForNewPacket;
break;
default:
fprintf(stderr, "ERROR: Unknown state in receive state machine\n");
exit(EXIT_FAILURE);
break;
}
}
}
usleep(25000);
}
}
void transmit(uint8_t *word, size_t length) {
uint8_t retVal;
// allocate space for the buffer
static uint8_t packet[MAX_MESSAGE_LENGTH + 1];
static uint16_t pkt_counter = 0;
++pkt_counter;
// Calculate the number of reserved bytes at the beginning of the packet
size_t reserved_space = 0;
// if transmitting a packet counter, reserve two bytes
if (framing_insert_counter) {
reserved_space += 2;
}
// reserve two bytes for the overall length of the packet including the
// packet counter, if present, and the field containing the length
reserved_space += 2;
size_t msg_length = 0;
// get a message to transmit.
//msg_length = get_message(&packet[reserved_space], (MAX_MESSAGE_LENGTH + 1) - reserved_space);
msg_length =
length <= (MAX_MESSAGE_LENGTH + 1) - reserved_space ? length : (MAX_MESSAGE_LENGTH + 1) - reserved_space;
strncpy((char*)&packet[reserved_space], (char*)word, msg_length);
// if message consists only of a newline, terminate
if (msg_length <= 1) {
return;
}
if (framing_insert_counter) {
packet[framing_counter_pos] = (uint8_t)(pkt_counter & 0xFF);
packet[framing_counter_pos+1] = (uint8_t)((pkt_counter>>8) & 0xFF);
// include the message length
packet[framing_counter_pos+2] = (uint8_t)(msg_length & 0xFF);
packet[framing_counter_pos+3] = (uint8_t)((msg_length>>8) & 0xFF);
}
else { // only include the message length
packet[framing_counter_pos] = (uint8_t)(msg_length & 0xFF);
packet[framing_counter_pos+1] = (uint8_t)((msg_length>>8) & 0xFF);
}
// Enter transmit mode only if not already in receive mode
if (currentState != TxState) {
retVal = mode_tx();
if (retVal != AXRADIO_ERR_NOERROR) {
fprintf(stderr, "ERROR: Unable to enter TX mode\n");
exit(EXIT_FAILURE);
}
currentState = TxState;
}
//printf("INFO: Sending another packet...\n");
//printf("DEBUG: msg_length = %d\n", msg_length);
//printf("DEBUG: reserved_space = %d\n", reserved_space);
retVal = transmit_packet(&remoteaddr_tx, packet, (uint16_t)(msg_length + reserved_space));
if (retVal != AXRADIO_ERR_NOERROR) {
fprintf(stderr, "ERROR: Unable to transmit a packet\n");
exit(EXIT_FAILURE);
}
usleep(100000);
}
void toPigLatin(uint8_t *input) {
//printf("input: %s\n", input);
// Allocate space for a word. I'm choosing to use an array of
// "reasonable" length
uint8_t word[MAX_WORD_LENGTH];
word[0] = '\0';
readWord(word, MAX_WORD_LENGTH, &input);
//printf("word: %s\n", word);
// While there are still words...
while (strlen((char*)word) > 0) {
// convert the word to pig latin
wordToPigLatin(word, MAX_WORD_LENGTH);
strcat((char*)word, "\n");
printf("%s", word);
transmit(word, strlen((char*)word));
// get the next word
readWord(word, MAX_WORD_LENGTH, &input);
//printf("word: %s\n", word);
}
}
void readWord(uint8_t *word, unsigned int wordLength, uint8_t **input) {
// initialize the word to zero length
unsigned int currentLoc = 0;
if (wordLength == 0) {
printf("ERROR: Internal error. No buffer allocated for word\n");
return;
}
word[currentLoc] = '\0';
// Examine the first character.
uint8_t ch;
ch = **input;
(*input)++;
// If it is a newline, we have no more words, so
// read and throw away the newline. That's all we need
// to do
if (ch == '\n') {
// do nothing
}
else {
int foundNonWhiteSpace = FALSE;
// loop until we find our first non-white space
// character and then the first white-space character
// after that. That means we found a word and
// the end of that word
while (((!foundNonWhiteSpace || !isspace(ch))) && ch != '\n') {
if (wordLength == 0) {
printf("WARNING: Word is too long for buffer. Breaking up the word.\n");
return;
}
if (!isspace(ch)) {
foundNonWhiteSpace = TRUE;
}
word[currentLoc++] = ch;
word[currentLoc] = '\0';
// Get the next letter
ch = **input;
(*input)++;
}
// Push the white space character back into the input buffer
(*input)--;
}
}
void wordToPigLatin(uint8_t *word, unsigned int wordLength) {
// allocate working space for a word
uint8_t *workWord = malloc(wordLength);
workWord[0] = '\0';
unsigned int srcLoc = 0;
unsigned int destLoc = 0;
// copy over any leading whitespace
while(word[srcLoc] && srcLoc < wordLength && isspace(word[srcLoc])) {
workWord[destLoc++] = word[srcLoc++];
workWord[destLoc] = '\0';
}
// Look at the next character
uint8_t ch = word[srcLoc];
// If it is a vowel...
if (tolower(ch) == 'a' || tolower(ch) == 'e' || tolower(ch) == 'i' ||
tolower(ch) == 'o' || tolower(ch) == 'u') {
// process a word beginning with a vowel
wordToPigLatinVowel(word, srcLoc, workWord, destLoc, wordLength);
}
// If it is a consonant...
else if (isalpha(ch)) {
// save that letter
uint8_t firstLetter = ch;
srcLoc++;
// Take care of the case of a one letter word
if (!word[srcLoc]) {
// Save the first character, unchanged to the destination
workWord[destLoc++] = ch;
workWord[destLoc] = '\0';
// Append "ay"
strcat((char*)workWord, "ay");
}
// else we have more than one letter
else {
// Process a word beginning with a consonant
wordToPigLatinConsonant(firstLetter, word, srcLoc, workWord,
destLoc, wordLength);
}
}
// else just copy over the word
else {
strcat((char*)workWord, (char*)&word[srcLoc]);
}
// Copy the workspace into our word
strncpy((char*)word, (char*)workWord, wordLength);
// Ensure it is null-terminated under all circumstances
if (strlen((char*)workWord) < wordLength - 1) {
word[strlen((char*)workWord)] = '\0';
}
else {
word[wordLength - 1] = '\0';
}
// Remember to free up the temporary workspace
free(workWord);
}
void wordToPigLatinVowel(uint8_t *word, unsigned int srcLoc, uint8_t workWord[],
unsigned int destLoc, unsigned int wordLength) {
// copy over the word
while (word[srcLoc] && srcLoc < wordLength) {
workWord[destLoc++] = word[srcLoc++];
workWord[destLoc] = '\0';
}
// append "way"
strcat((char *)workWord, "way");
}
void wordToPigLatinConsonant(uint8_t firstLetter, uint8_t *word, unsigned int srcLoc,
uint8_t *workWord, unsigned int destLoc, unsigned int wordLength) {
// Copy over the next letter, properly capitalizing it
if (isupper(firstLetter)) {
workWord[destLoc++] = (uint8_t)toupper(word[srcLoc++]);
workWord[destLoc] = '\0';
} else {
workWord[destLoc++] = (uint8_t)tolower(word[srcLoc++]);
workWord[destLoc] = '\0';
}
while (word[srcLoc] && srcLoc < wordLength) {
workWord[destLoc++] = word[srcLoc++];
workWord[destLoc] = '\0';
}
// Append what was previously the first letter
workWord[destLoc++] = (uint8_t)tolower(firstLetter);
workWord[destLoc] = '\0';
// Append "ay"
strcat((char*)workWord, "ay");
}
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