ALPU加密I2C驱动程序

#include <stdio.h> #include "interface.h" #define DEBUGER_MODE 0 #define PRINTFMODE 0 void _i2c_start(void) { #if PRINTFMODE printf("\r\n _i2c_start"); #endif SDA_HIGH; I2C_DELAY; I2C_DELAY; SCL_HIGH; I2C_DELAY; I2C_DELAY; SDA_LOW; I2C_DELAY; SCL_LOW; I2C_DELAY; } void _i2c_stop(void) { #if PRINTFMODE printf("\r\n _i2c_stop"); #endif SDA_LOW; I2C_DELAY; SCL_HIGH; I2C_DELAY; SDA_HIGH; I2C_DELAY_LONG; } unsigned char _i2c_write_byte(unsigned char data) { unsigned char i; #if PRINTFMODE printf("\r\n _i2c_write_byte"); #endif for(i = 0; i< 8; i++) { if( (data << i) & 0x80) SDA_HIGH; else SDA_LOW; I2C_DELAY; SCL_HIGH; I2C_DELAY; SCL_LOW; I2C_DELAY; } if(_i2c_ack_detect()) { #if PRINTFMODE printf("\n\r Acknoledge Error"); #endif return ERROR_CODE_FALSE; } return ERROR_CODE_TRUE; } unsigned char _i2c_read_byte(void) { unsigned char i, data; #if PRINTFMODE printf("\r\n _i2c_read_byte"); #endif data = 0; //20081016 //SDA_HIGH; //end SDA_IN; for(i = 0; i< 8; i++){ data <<= 1; I2C_DELAY; SCL_HIGH; I2C_DELAY; if (SDA_DETECT) data |= 0x01; SCL_LOW; I2C_DELAY; } _i2c_ack_send(); return data; } unsigned char _i2c_ack_detect(void) { #if PRINTFMODE printf("\r\n _i2c_ack_detect"); #endif //SDA_HIGH; SDA_IN; // SDA Input Mode I2C_DELAY; SCL_HIGH; I2C_DELAY; if (SDA_DETECT) { SDA_OUT; #if PRINTFMODE printf("\r\n Ack Error!"); #endif return ERROR_CODE_FALSE; // false } I2C_DELAY; SCL_LOW; SDA_OUT; return ERROR_CODE_TRUE; // true } void _i2c_ack_send(void) { #if PRINTFMODE printf("\r\n _i2c_ack_send"); #endif SDA_OUT; SDA_LOW; I2C_DELAY; SCL_HIGH; I2C_DELAY; SCL_LOW; I2C_DELAY; } unsigned char _i2c_write(unsigned char device_addr, unsigned char sub_addr, unsigned char *buff, int ByteNo) { unsigned char i; #if PRINTFMODE printf("\r\n_i2c_write"); #endif _i2c_start(); I2C_DELAY; if(_i2c_write_byte(device_addr)) { _i2c_stop(); #if DEBUGER_MODE printf("\n\r Tx device_addr Error - 0x%2x ",device_addr); #endif return ERROR_CODE_WRITE_ADDR; } if(_i2c_write_byte(sub_addr)) { _i2c_stop(); #if DEBUGER_MODE printf("\n\r Tx sub_addr Error - 0x%2x 0x%2x ",device_addr,sub_addr); #endif return ERROR_CODE_WRITE_ADDR; } for(i = 0; i<ByteNo; i++) { if(_i2c_write_byte(buff[i])) { _i2c_stop(); #if DEBUGER_MODE printf("\n\r Tx Data Err : "); printf("0x%2x 0x%2x ",device_addr,sub_addr); for (i=0; i<ByteNo; i++) printf("0x%2x ", buff[i]); #endif return ERROR_CODE_WRITE_DATA; } } I2C_DELAY; _i2c_stop(); I2C_DELAY_LONG; #if DEBUGER_MODE printf("\n\r Tx Data : "); printf("0x%2x 0x%2x ",device_addr,sub_addr); for (i=0; i<ByteNo; i++) printf("0x%2x ", buff[i]); #endif return ERROR_CODE_TRUE; } unsigned char _i2c_read(unsigned char device_addr, unsigned char sub_addr, unsigned char *buff, int ByteNo) { unsigned char i; #if PRINTFMODE printf("\r\n_i2c_read"); #endif _i2c_start(); I2C_DELAY; if(_i2c_write_byte(device_addr)) { _i2c_stop(); #if DEBUGER_MODE printf("\n\r Rx device_addr Error - 0x%2x ",device_addr); #endif return ERROR_CODE_READ_ADDR; } if(_i2c_write_byte(sub_addr)) { _i2c_stop(); #if DEBUGER_MODE printf("\n\r Rx sub_addr Error - 0x%2x 0x%2x ",device_addr,sub_addr); #endif return ERROR_CODE_READ_ADDR; } _i2c_start(); I2C_DELAY; if(_i2c_write_byte(device_addr+1)) { _i2c_stop(); #if DEBUGER_MODE printf("\n\r Rx Data Err : "); printf("0x%2x 0x%2x ",device_addr,sub_addr); for (i=0; i<ByteNo; i++) printf("0x%2x ", buff[i]); #endif return ERROR_CODE_READ_ADDR; } for(i = 0; i<ByteNo; i++) buff[i] = _i2c_read_byte(); I2C_DELAY; I2C_DELAY_LONG; _i2c_stop(); I2C_DELAY_LONG; #if DEBUGER_MODE printf("\n\r Rx Data : "); printf("0x%2x 0x%2x ",device_addr,sub_addr); for (i=0; i<ByteNo; i++) printf("0x%2x ", buff[i]); #endif return ERROR_CODE_TRUE; } /* EOF */