void owchip_geteui(uint8_t* eui) { // >= 6000us
uint8_t id[8];
int retry;
int crc;
uint8_t* byte;
uint16_t oldTactl;
retry = 5;
memset(eui,0,8);
// store current value of TACTL
oldTactl = TACTL;
// start timer in continuous mode at 1MHz
TACTL = TASSEL_2 | ID_2 | MC_2;
owpin_init();
while (retry-- > 0) {
crc = 0;
if(ow_reset()) {
ow_write_byte(0x33); //read rom
for(byte=id+7; byte>=id; byte--) {
crc = crc8_byte( crc, *byte=ow_read_byte() );
}
if(crc==0) {
// CRC valid
memcpy(eui,id,8);
}
}
}
// restore value of TACTL
TACTL = oldTactl;
}
/*
* Returns: 0 on failure
* 1 on success
*/
unsigned char send_packet(unsigned char to_addr, unsigned char *data, unsigned char data_len) {
// TODO: Wait for timeout to tick down (in multi-station mode)
// Too much data
if (data_len > PACKET_DATA_MAX) {
return 0;
}
unsigned char crc;
crc8_init(0xFF);
rfm12_EnableTx(); // TODO: turn on transmitter
rfm12_Tx_Byte(0xAA); // Preamble for RFM12
rfm12_Tx_Byte(0xAA);
rfm12_Tx_Byte(0xAA);
rfm12_Tx_Byte(0x2D); // RFM12 sync pattern
rfm12_Tx_Byte(0xD4);
rfm12_Tx_Byte(HEADER_LENGTH + data_len); // Total packet length
crc = crc8_byte(HEADER_LENGTH + data_len);
rfm12_Tx_Byte(PACKET_MAGIC); // Magic identification bytes
crc = crc8_byte(PACKET_MAGIC);
rfm12_Tx_Byte(NODE_ADDRESS); // Sender ID
crc = crc8_byte(NODE_ADDRESS);
rfm12_Tx_Byte(to_addr); // Destination ID
crc = crc8_byte(to_addr);
rfm12_Tx_Byte(sequence_number); // Packet sequence number
crc = crc8_byte(sequence_number);
sequence_number++;
rfm12_Tx_Byte(0); // Reserved for future use
crc = crc8_byte(0);
rfm12_Tx_Byte(0); // Reserved for future use
crc = crc8_byte(0);
for (int n = 0; n < data_len; n++) {
rfm12_Tx_Byte(data[n]);
crc = crc8_byte(data[n]);
}
rfm12_Tx_Byte(crc); // CRC
rfm12_Tx_Byte(0xAA); // Trailer
rfm12_Tx_Byte(0xAA);
rfm12_DisableTx(); // Turn off Tx
return 1;
}
unsigned char
_process_packet(unsigned char bytes_received) {
unsigned char length = 0;
unsigned char crc = 0;
receive_count++;
// Check for the start-of-packet byte
if (packet_buffer[0] != PACKET_MAGIC) {
return 0;
}
// Check that the packet is for us (or, in multicast mode, is for
// the multicast address)
#ifdef PACKET_MULTICAST
if (packet_buffer[2] != NODE_ADDRESS && packet_buffer[2] != MULTICAST_ADDRESS) {
#else
if (packet_buffer[2] != NODE_ADDRESS) {
#endif
return 0;
}
// Extract the length
length = packet_buffer[3];
// Calculate the CRC for the whole packet, minus the CRC
// which is at the end
crc8_init(0xff);
for (int n = 0; n < length - 1; n++) {
crc = crc8_byte(packet_buffer[n]);
}
// Check the CRC against the packet
if (crc != packet_buffer[length - 1]) {
return 0;
}
// Copy the data to the buffer
for (int n = 0; n < length - HEADER_LENGTH; n++) {
data_buffer[n] = packet_buffer[7 + n];
}
data_arrived = length - HEADER_LENGTH;
return 1;
}
void eui64_get(uint8_t* addressToWrite) { // >= 6000us
uint8_t id[8];
int retry;
int crc;
uint8_t* byte;
uint16_t oldTactl;
return;//poipoi
retry = 5;
memset(addressToWrite,0,8);
// store current value of TACTL
oldTactl = TACTL;
// start timer in continuous mode at 1MHz
TACTL = TASSEL_2 | ID_2 | MC_2;
owpin_init();
while (retry-- > 0) {
crc = 0;
if(ow_reset()) {
ow_write_byte(0x33); //read rom
for(byte=id+7; byte>=id; byte--) {
crc = crc8_byte( crc, *byte=ow_read_byte() );
}
if(crc==0) {
// CRC valid
*(addressToWrite+0) = 0x14;
*(addressToWrite+1) = 0x15;
*(addressToWrite+2) = 0x92;
memcpy(addressToWrite+3,id+1,5);
}
}
}
// restore value of TACTL
TACTL = oldTactl;
}
