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added crc-8 functions from BTnut code needed for RFCOMM

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This commit is contained in:
matthias.ringwald 2009-09-24 19:36:52 +00:00
parent 7fdefb05bf
commit d416da4205
3 changed files with 60 additions and 7 deletions
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8
src/hci.c
View File

@ -211,13 +211,7 @@ static void event_handler(uint8_t *packet, int size){
hci_send_cmd(&hci_link_key_request_negative_reply, &addr);
return;
}
// pin code request
if (packet[0] == HCI_EVENT_PIN_CODE_REQUEST){
bt_flip_addr(addr, &packet[2]);
hci_send_cmd(&hci_pin_code_request_reply, &addr, 4, "1234");
}
hci_stack.event_packet_handler(packet, size);
// execute main loop

56
src/utils.c
View File

@ -63,3 +63,59 @@ int sscan_bd_addr(uint8_t * addr_string, bd_addr_t addr){
}
return (result == 6);
}
/*
* CRC (reversed crc) lookup table as calculated by the table generator in ETSI TS 101 369 V6.3.0.
*/
static const uint8_t crc8table[256] = { /* reversed, 8-bit, poly=0x07 */
0x00, 0x91, 0xE3, 0x72, 0x07, 0x96, 0xE4, 0x75, 0x0E, 0x9F, 0xED, 0x7C, 0x09, 0x98, 0xEA, 0x7B,
0x1C, 0x8D, 0xFF, 0x6E, 0x1B, 0x8A, 0xF8, 0x69, 0x12, 0x83, 0xF1, 0x60, 0x15, 0x84, 0xF6, 0x67,
0x38, 0xA9, 0xDB, 0x4A, 0x3F, 0xAE, 0xDC, 0x4D, 0x36, 0xA7, 0xD5, 0x44, 0x31, 0xA0, 0xD2, 0x43,
0x24, 0xB5, 0xC7, 0x56, 0x23, 0xB2, 0xC0, 0x51, 0x2A, 0xBB, 0xC9, 0x58, 0x2D, 0xBC, 0xCE, 0x5F,
0x70, 0xE1, 0x93, 0x02, 0x77, 0xE6, 0x94, 0x05, 0x7E, 0xEF, 0x9D, 0x0C, 0x79, 0xE8, 0x9A, 0x0B,
0x6C, 0xFD, 0x8F, 0x1E, 0x6B, 0xFA, 0x88, 0x19, 0x62, 0xF3, 0x81, 0x10, 0x65, 0xF4, 0x86, 0x17,
0x48, 0xD9, 0xAB, 0x3A, 0x4F, 0xDE, 0xAC, 0x3D, 0x46, 0xD7, 0xA5, 0x34, 0x41, 0xD0, 0xA2, 0x33,
0x54, 0xC5, 0xB7, 0x26, 0x53, 0xC2, 0xB0, 0x21, 0x5A, 0xCB, 0xB9, 0x28, 0x5D, 0xCC, 0xBE, 0x2F,
0xE0, 0x71, 0x03, 0x92, 0xE7, 0x76, 0x04, 0x95, 0xEE, 0x7F, 0x0D, 0x9C, 0xE9, 0x78, 0x0A, 0x9B,
0xFC, 0x6D, 0x1F, 0x8E, 0xFB, 0x6A, 0x18, 0x89, 0xF2, 0x63, 0x11, 0x80, 0xF5, 0x64, 0x16, 0x87,
0xD8, 0x49, 0x3B, 0xAA, 0xDF, 0x4E, 0x3C, 0xAD, 0xD6, 0x47, 0x35, 0xA4, 0xD1, 0x40, 0x32, 0xA3,
0xC4, 0x55, 0x27, 0xB6, 0xC3, 0x52, 0x20, 0xB1, 0xCA, 0x5B, 0x29, 0xB8, 0xCD, 0x5C, 0x2E, 0xBF,
0x90, 0x01, 0x73, 0xE2, 0x97, 0x06, 0x74, 0xE5, 0x9E, 0x0F, 0x7D, 0xEC, 0x99, 0x08, 0x7A, 0xEB,
0x8C, 0x1D, 0x6F, 0xFE, 0x8B, 0x1A, 0x68, 0xF9, 0x82, 0x13, 0x61, 0xF0, 0x85, 0x14, 0x66, 0xF7,
0xA8, 0x39, 0x4B, 0xDA, 0xAF, 0x3E, 0x4C, 0xDD, 0xA6, 0x37, 0x45, 0xD4, 0xA1, 0x30, 0x42, 0xD3,
0xB4, 0x25, 0x57, 0xC6, 0xB3, 0x22, 0x50, 0xC1, 0xBA, 0x2B, 0x59, 0xC8, 0xBD, 0x2C, 0x5E, 0xCF
};
#define CRC8_INIT 0xFF // Initial FCS value
#define CRC8_OK 0xCF // Good final FCS value
/*-----------------------------------------------------------------------------------*/
uint8_t crc8(uint8_t *data, uint16_t len)
{
uint16_t count;
uint8_t crc = CRC8_INIT;
for (count = 0; count < len; count++)
crc = crc8table[crc ^ data[count]];
return crc;
}
/*-----------------------------------------------------------------------------------*/
uint8_t crc8_check(uint8_t *data, uint16_t len, uint8_t check_sum)
{
uint8_t crc;
crc = crc8(data, len);
crc = crc8table[crc ^ check_sum];
if (crc == CRC8_OK)
return 0; /* Valid */
else
return 1; /* Failed */
}
/*-----------------------------------------------------------------------------------*/
uint8_t crc8_calc(uint8_t *data, uint16_t len)
{
/* Ones complement */
return 0xFF - crc8(data, len);
}

3
src/utils.h
View File

@ -56,5 +56,8 @@ void hexdump(void *data, int size);
void print_bd_addr(bd_addr_t addr);
int sscan_bd_addr(uint8_t * addr_string, bd_addr_t addr);
uint8_t crc8_check(uint8_t *data, uint16_t len, uint8_t check_sum);
uint8_t crc8_calc(uint8_t *data, uint16_t len);
#define BD_ADDR_CMP(a,b) memcmp(a,b, BD_ADDR_LEN)
#define BD_ADDR_COPY(dest,src) memcpy(dest,src,BD_ADDR_LEN)