From d416da420551d8efcb2c415256722775fb60f2e8 Mon Sep 17 00:00:00 2001 From: "matthias.ringwald" Date: Thu, 24 Sep 2009 19:36:52 +0000 Subject: [PATCH] added crc-8 functions from BTnut code needed for RFCOMM --- src/hci.c | 8 +------- src/utils.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++++++++ src/utils.h | 3 +++ 3 files changed, 60 insertions(+), 7 deletions(-) diff --git a/src/hci.c b/src/hci.c index 81b9d5705..9af931b8e 100644 --- a/src/hci.c +++ b/src/hci.c @@ -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 diff --git a/src/utils.c b/src/utils.c index f311b3fcc..50a53ddd5 100644 --- a/src/utils.c +++ b/src/utils.c @@ -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); +} diff --git a/src/utils.h b/src/utils.h index 1bd6eec55..8677d1b50 100644 --- a/src/utils.h +++ b/src/utils.h @@ -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)