#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?“atsha204a_comm.h“

#define?ATSHA204_ADDR?（0xc8）

static?unsigned?char?（*atsha204a_i2c_read）（unsigned?char?unsigned?char?unsigned?char?*?int）;
static?unsigned?char?（*atsha204a_i2c_write）（unsigned?char?unsigned?char?unsigned?char?*?int）;

int?atsha204a_set_i2c_func（
????unsigned?char?（*i2c_read）（unsigned?char?unsigned?char?unsigned?char?*?int）
????unsigned?char?（*i2c_write）（unsigned?char?unsigned?char?unsigned?char?*?int）
）
{
????if?（i2c_read?==?NULL?||?i2c_write?==?NULL）?{
????????return?1;
????}

????atsha204a_i2c_read?=?i2c_read;
????atsha204a_i2c_write?=?i2c_write;
????return?0;
}

static?void?msleep（int?msec）
{
????usleep（msec?*?1000）;
}

/*
?*?CRC計算，從atsha204代碼庫移植過來
?*/
static?void?sha204c_calculate_crc（unsigned?char?length?unsigned?char?*data?unsigned?char?*crc）
{
????unsigned?char?counter;
????unsigned?short?crc_register?=?0;
????unsigned?short?polynom?=?0x8005;
????unsigned?char?shift_register;
????unsigned?char?data_bit?crc_bit;
????for?（counter?=?0;?counter?????{
????????for?（shift_register?=?0x01;?shift_register?>?0x00;?shift_register?<<=?1）
????????{
????????????data_bit?=?（data[counter]?&?shift_register）???1?:?0;
????????????crc_bit?=?crc_register?>>?15;
????????????//?Shift?CRC?to?the?left?by?1.
????????????crc_register?<<=?1;
????????????if?（（data_bit?^?crc_bit）?!=?0）
????????????{
????????????????crc_register?^=?polynom;
????????????}
????????}
????}
????crc[0]?=?（unsigned?char）?（crc_register?&?0x00FF）;
????crc[1]?=?（unsigned?char）?（crc_register?>>?8）;
}

/*
?*?CRC校驗，從atsha204代碼庫移植過來
?*/
static?unsigned?char?sha204c_check_crc（unsigned?char?length?unsigned?char??*data）
{
????unsigned?char??crc[2];
????sha204c_calculate_crc（length-2?data?crc）;
????return?（crc[0]?==?data[length?-?2]?&&?crc[1]?==?data[length?-?1]）???SHA204_SUCCESS?:?SHA204_BAD_CRC;
}

static?int?atsha204a_send_command（struct?atsha204a_command_packet?*command_packet）
{
????unsigned?char?command_buffer_len?=?7?+?command_packet->data_len;
????unsigned?char?command_buffer[48];

????if?（command_packet->data_len?>?32）
????????return?SHA204_INVALID_SIZE;

????command_buffer[0]?=?command_buffer_len;
????command_buffer[1]?=?command_packet->op_code;
????command_buffer[2]?=?command_packet->param1;
????command_buffer[3]?=?command_packet->param2[0];
????command_buffer[4]?=?command_packet->param2[1];

????if（command_packet->data_len?>?0）?{
????????memcpy（command_buffer+5?command_packet->data?command_packet->data_len）;
????}

????sha204c_calculate_crc（command_buffer_len-2?command_buffer?command_buffer+command_buffer_len-2）;

????atsha204a_i2c_write（ATSHA204_ADDR?0x03?command_buffer?command_buffer_len）;

????return?0;
}

/*
?*?讀取操作命令的response內容，讀取的地址都為0x00
?*/
static?int?atsha204a_recv_response（unsigned?char?length?unsigned?char?*response_data）
{
????atsha204a_i2c_read（ATSHA204_ADDR?0x00?re

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???????3895??2018-03-07?12:40??TX2-I2C_ATSHA201A\atsha204a_comm.c

?????文件???????2418??2018-03-07?12:40??TX2-I2C_ATSHA201A\atsha204a_comm.h

?????文件???????1690??2018-09-10?16:34??TX2-I2C_ATSHA201A\atsha204a_i2c.c

?????文件????????253??2018-03-07?12:40??TX2-I2C_ATSHA201A\atsha204a_i2c.h

?????文件????????747??2018-03-07?12:40??TX2-I2C_ATSHA201A\atsha204a_test.c

?????文件????????228??2018-03-06?16:45??TX2-I2C_ATSHA201A\Makefile

?????目錄??????????0??2018-09-10?16:34??TX2-I2C_ATSHA201A

-----------?---------??----------?-----??----

?????????????????9231????????????????????7