int isSolvable(Board start, Board goal){
// returns TRUE if solvable, else FALSE
int solvable = FALSE;
if (calcParity(start) % 2 == calcParity(goal) % 2){
solvable = TRUE;
}
return solvable;
}
void interpretData(const byte *data, int size, char *output)
{
if (size != 7) {
sprintf(output, "Invalid data (not 7 bytes)");
return;
}
// Check parity bits. (Byte 0 and byte 7 have no parity bits.)
for (int i=1; i<=5; i++) {
if (calcParity(data[i]) != (data[i] & 0x80)) {
sprintf(output, "Parity failure in byte %d [0x%.2X !~ 0x%.2X]", i, data[i], calcParity(data[i]));
return;
}
}
// Check checksum.
unsigned char cksum = 0;
for (int i=0; i<=5; i++) {
cksum += data[i];
}
if ((cksum & 0xFF) != data[6]) {
sprintf(output, "Checksum failure (0x%X vs. 0x%X)", cksum, data[6]);
return;
}
// Data is good! Construct string of data...
// Source A/B/C and ID
output += sprintf(output, "Channel ", (data[0] & 0xC0) == 0xC0 ? 'A' :
(data[0] & 0xC0) == 0x80 ? 'B' :
(data[0] & 0xC0) == 0x00 ? 'C' :
'x');
output += sprintf(output, "0x%X ", (data[0] & 0x3F) << 7 | (data[1] & 0x7F));
output += sprintf(output, "%d%% ", data[3] & 0x7f);
// Temperature
unsigned long t1 = ((data[4] & 0x0F) << 7) | (data[5] & 0x7F);
float temp = ((float)t1 - (float) 1024) / 10.0;
output += sprintf(output, "%f C (%f F)", temp, temp * 9.0 / 5.0 + 32.0);
}
void interpretData(const byte *data, int size)
{
if (size == 7) {
printf("\n");
for (int i=0; i<size; i++) {
printf("0x%.2X ", data[i]);
}
printf("\n");
// Check parity bits. (Byte 0 and byte 7 have no parity bits.)
for (int i=1; i<=5; i++) {
if (calcParity(data[i]) != (data[i] & 0x80)) {
printf("Parity failure in byte %d\n", i);
return;
}
}
// Check checksum.
unsigned char cksum = 0;
for (int i=0; i<=5; i++) {
cksum += data[i];
}
if ((cksum & 0xFF) != data[6]) {
printf("Checksum failure (0x%X vs. 0x%X)\n", cksum, data[6]);
return;
}
// Packet is good! Display information.
// Source A/B/C and ID
printf("Source ID: 0x%X\n", (data[0] & 0x3F) << 7 | (data[1] & 0x7F));
printf("Channel: %c\n", (data[0] & 0xC0) == 0xC0 ? 'A' :
(data[0] & 0xC0) == 0x80 ? 'B' :
(data[0] & 0xC0) == 0x00 ? 'C' :
'x');
if ((data[2] & 0x7F) != 0x44) {
printf("Device signature does not match AcuRite signature: 0x%X (expected 0x44)\n", data[2] & 0x7F);
}
// Humidity. Value of 0x7F means "no humidity sensor installed"
if ((data[3] & 0x7F) != 0x7F) {
printf("Humidity: %d%%\n", data[3] & 0x7f);
}
// Temperature
unsigned long t1 = ((data[4] & 0x0F) << 7) | (data[5] & 0x7F);
float temp = ((float)t1 - (float) 1024) / 10.0;
printf("Temperature: %f C (%f F)\n", temp, temp * 9.0 / 5.0 + 32.0);
}
}
