Posted on July 05, 2018 at 14:32Hey there.Hey there.
Here is what I do:
My defines:
// defines for iso15693
// all values are LSBIT first
// all values inverted
// SOF / EOF 1 of 4
#define ISO15693_SOF_1_4 0x7B
#define ISO15693_EOF_1_4 0xDF // possiable 0x0B
// bit position 1 0f 4
#define ISO15693_00_1_4 0xBF
#define ISO15693_01_1_4 0xFB
#define ISO15693_10_1_4 0xEF
#define ISO15693_11_1_4 0xFE
// command defines
#define INVENTORY_COMMAND 0x80
// flags definnes
#define INVENTORY_ONE_SLOT_LOW_DATA 0x24
#define INVENTORY_ONE_SLOT_HIGH_DATA 0x64
#define INVENTORY_NO_MASK 0x00
#define INVENTORY_MASK_LENGTH 0x00
*******************************************************************************************
This is my function for CRC_16:
static void calculate_crc16(char data[], uint8_t length_of_data, char* crc_16_high, char* crc_16_low){
uint16_t crc_16;
uint16_t polynom = 0x8408;
uint16_t initial_value = 0xFFFF;
crc_16 = initial_value;
for(uint8_t i = 0; i < length_of_data; i++){
crc_16 ^= data[i];
for(int8_t j = 0; j < 8; j++){
if((crc_16 & 0x0001) == 0){
crc_16 >>= 1;
}else{
crc_16 = (crc_16 >>1)^polynom;
}
}
}
(*crc_16_low) = crc_16 & 0xFF;
(*crc_16_high) = ((*crc_16_high) >> 8);
}
*******************************************************************************************
My function for coding 1 out of 4:
static void RFID_iso15693_1of4_coding(char iso15693_inventory_command[], int length, char fifo_write_data_iso15693[64]){
uint8_t a = 0;
fifo_write_data_iso15693[a] = ISO15693_SOF_1_4;
a++;
for(uint8_t i = 0; i < length; i++){
for(uint8_t j = 0; j < 8; j += 2){
uint8_t tmp = (iso15693_inventory_command[i] >> j) & 3;
switch (tmp) {
case 0:
fifo_write_data_iso15693[a] = ISO15693_00_1_4;
a++;
break;
case 1:
fifo_write_data_iso15693[a] = ISO15693_01_1_4;
a++;
break;
case 2:
fifo_write_data_iso15693[a] = ISO15693_10_1_4;
a++;
break;
case 3:
fifo_write_data_iso15693[a] = ISO15693_11_1_4;
a++;
break;
}
}
}
fifo_write_data_iso15693[a] = ISO15693_EOF_1_4;
}
*******************************************************************************************
My function for sending out:
void rfid_search_for_iso15693(void){
char fifo_write_data_iso15693[64];
char iso15693_inventory_command[5];
send_direct_command(RFID_CLEAR);
iso15693_inventory_command[0] = INVENTORY_ONE_SLOT_HIGH_DATA;
iso15693_inventory_command[1] = INVENTORY_COMMAND;
iso15693_inventory_command[2] = INVENTORY_NO_MASK;
// debug
uart_puts('CALC_CRC\r\n');
// debug
calculate_crc16(iso15693_inventory_command,4, &iso15693_inventory_command[4],&iso15693_inventory_command[5]);
// debug
uart_puts('command\r\n');
for(int i = 0; i < 5; i++){
uart_putHex2(iso15693_inventory_command[i]);
}
uart_puts('\r\n');
// debug
RFID_iso15693_1of4_coding(iso15693_inventory_command,5,fifo_write_data_iso15693);
// debug
uart_puts('coded_iso15693_1of4\r\n');
for(int i = 0; i < 22; i++){
uart_putHex2(fifo_write_data_iso15693[i]);
}
uart_puts('\r\n');
// debug
rfid_write_fifo(22,fifo_write_data_iso15693);
// set number of full transmittet bytes for air-communication
// number of bytes = 22
rfid_write_register(0x1D,0x00);
rfid_write_register(0x1E,0xB0);
send_direct_command(RFID_TRANSMIT_WITHOUT_CRC);
while(TRANS_FLAG_RECIVE != 1){
Delay_ms(1);
}
TRANS_FLAG_RECIVE = 0;
rfid_read_fifo();
}
The registers 0e, 0f, 10, 11 are not set at all. Do I have to do it ?
Best regards, Nicolai
