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/******************************************************************************
文 件 名：Simulated_IIC_Master.c
功能描述：IO端口模拟的IIC(I2C)主机函数库文件
作 者：张暄
版 本：V1.0
日 期：2016.12.21
******************************************************************************/
#include "Simulated_IIC_2_Master.h"
#include "rh850_macros.h"
#include "dr7f701401.dvf.h"
#define SIMULATED_IIC_2_SCL SDB_LED_SCL // SCL信号
#define SIMULATED_IIC_2_SCL_DIR SDB_LED_SCL_DIR // SCL方向
#define SIMULATED_IIC_2_OUT_SDA SDB_LED_SDA // SDA信号
#define SIMULATED_IIC_2_IN_SDA SDB_LED_SDA_IN
#define SIMULATED_IIC_2_SDA_DIR SDB_LED_SDA_DIR // SDA方向
uint8_t u8SimulatedIIC2ReceivedACK;
typedef enum
{
GPIO_DIR_OUT = 0U,
GPIO_DIR_IN
} GPIO_Direction_en_t;
/******************************************************************************
函数名：IIC_Init
功 能：初始化IIC总线
参 数：无
返回值：无
******************************************************************************/
void Simulated_IIC_2_Init(void)
{
SIMULATED_IIC_2_SCL_DIR = GPIO_DIR_IN; // SCL被设置为输入,IO口为高阻状态,总线上SCL信号由上拉电阻拉高,此时SCL = 1
Simulated_IIC_2_Delay( );
Simulated_IIC_2_Delay( );
SIMULATED_IIC_2_SDA_DIR = GPIO_DIR_IN; // SDA被设置为输入,IO口为高阻状态,总线上SDA信号由上拉电阻拉高,此时SDA = 1
Simulated_IIC_2_Delay( );
Simulated_IIC_2_Delay( );
u8SimulatedIIC2ReceivedACK = SIMULATED_IIC_2_INVALID_ACK;
}
/******************************************************************************
函数名：IIC_Start
功 能：在IIC总线上发送起始信号,发起一次IIC通信
参 数：无
返回值：无
******************************************************************************/
void Simulated_IIC_2_Start(void)
{
u8SimulatedIIC2ReceivedACK = SIMULATED_IIC_2_INVALID_ACK;
SIMULATED_IIC_2_SDA_DIR = GPIO_DIR_IN; // SDA被设置为输入,IO口为高阻状态,总线上SDA信号由上拉电阻拉高,此时SDA = 1
Simulated_IIC_2_Delay( );
Simulated_IIC_2_Delay( );
SIMULATED_IIC_2_SCL_DIR = GPIO_DIR_IN; // SCL被设置为输入,IO口为高阻状态,总线上SCL信号由上拉电阻拉高,此时SCL = 1
Simulated_IIC_2_Delay( );
Simulated_IIC_2_Delay( );
SIMULATED_IIC_2_SDA_DIR = GPIO_DIR_OUT; // SDA输出0,此时SDA = 0
SIMULATED_IIC_2_OUT_SDA = 0;
Simulated_IIC_2_Delay( );
Simulated_IIC_2_Delay( );
SIMULATED_IIC_2_SCL_DIR = GPIO_DIR_OUT; // SCL输出0,此时SCL = 0
SIMULATED_IIC_2_SCL = 0;
Simulated_IIC_2_Delay( );
}
/******************************************************************************
函数名：IIC_Stop
功 能：在IIC总线上发送停止信号,终止当前IIC通信
参 数：无
返回值：无
******************************************************************************/
void Simulated_IIC_2_Stop(void)
{
u8SimulatedIIC2ReceivedACK = SIMULATED_IIC_2_INVALID_ACK;
SIMULATED_IIC_2_SDA_DIR = GPIO_DIR_OUT; // SDA输出0,此时SDA = 0
SIMULATED_IIC_2_OUT_SDA = 0;
Simulated_IIC_2_Delay( );
Simulated_IIC_2_Delay( );
SIMULATED_IIC_2_SCL_DIR = GPIO_DIR_IN; // SCL被设置为输入,IO口为高阻状态,总线上SCL信号由上拉电阻拉高,此时SCL = 1
SIMULATED_IIC_2_SCL = 0;
Simulated_IIC_2_Delay( );
Simulated_IIC_2_Delay( );
SIMULATED_IIC_2_SDA_DIR = GPIO_DIR_IN; // SDA被设置为输入,IO口为高阻状态,总线上SDA信号由上拉电阻拉高,此时SDA = 1
Simulated_IIC_2_Delay( );
Simulated_IIC_2_Delay( );
}
/******************************************************************************
函数名：IIC_Transmit_Data
功 能：向IIC总线上发送1字节数据
参 数：Data：发送的数据
返回值：总线上器件的确认(ACK) 0 - ACK 1 - NAK
******************************************************************************/
void Simulated_IIC_2_Transmit_Data(uint8_t Data)
{
uint8_t i;
u8SimulatedIIC2ReceivedACK = SIMULATED_IIC_2_INVALID_ACK;
for ( i = 0; i < 8; i++ )
{
if ( Data & 0x80 )
SIMULATED_IIC_2_SDA_DIR = GPIO_DIR_IN; // SDA被设置为输入,IO口为高阻状态,总线上SDA信号由上拉电阻拉高,此时SDA = 1
else
{
SIMULATED_IIC_2_SDA_DIR = GPIO_DIR_OUT; // SDA输出0,此时SDA = 0
SIMULATED_IIC_2_OUT_SDA = 0;
}
Simulated_IIC_2_Delay( );
Simulated_IIC_2_Delay( );
SIMULATED_IIC_2_SCL_DIR = GPIO_DIR_IN; // SCL被设置为输入,IO口为高阻状态,总线上SCL信号由上拉电阻拉高,此时SCL = 1
Simulated_IIC_2_Delay( );
Simulated_IIC_2_Delay( );
SIMULATED_IIC_2_SCL_DIR = GPIO_DIR_OUT; // SCL输出0,此时SCL = 0
SIMULATED_IIC_2_SCL = 0;
Simulated_IIC_2_Delay( );
Data <<= 1;
}
SIMULATED_IIC_2_SDA_DIR = GPIO_DIR_IN; // 设置SDA为输入状态
Simulated_IIC_2_Delay( );
Simulated_IIC_2_Delay( );
SIMULATED_IIC_2_SCL_DIR = GPIO_DIR_IN; // SCL被设置为输入,IO口为高阻状态,总线上SCL信号由上拉电阻拉高,此时SCL = 1
Simulated_IIC_2_Delay( );
Simulated_IIC_2_Delay( );
u8SimulatedIIC2ReceivedACK = SIMULATED_IIC_2_IN_SDA;
SIMULATED_IIC_2_SCL_DIR = GPIO_DIR_OUT; // SCL输出0,此时SCL = 0
SIMULATED_IIC_2_SCL = 0;
Simulated_IIC_2_Delay( );
}
/******************************************************************************
函数名：IIC_Receive_Data
功 能：从IIC总线上接收1字节数据
参 数：无
返回值：接收到的数据
******************************************************************************/
uint8_t Simulated_IIC_2_Receive_Data(void)
{
uint8_t i;
uint8_t Data;
Data = 0;
SIMULATED_IIC_2_SDA_DIR = GPIO_DIR_IN; // 设置SDA为输入状态
Simulated_IIC_2_Delay( );
Simulated_IIC_2_Delay( );
for ( i = 0; i < 8; i++ )
{
Data <<= 1;
SIMULATED_IIC_2_SCL_DIR = GPIO_DIR_IN; // SCL被设置为输入,IO口为高阻状态,总线上SCL信号由上拉电阻拉高,此时SCL = 1
Simulated_IIC_2_Delay( );
Simulated_IIC_2_Delay( );
Simulated_IIC_2_Delay( );
Data |= SIMULATED_IIC_2_IN_SDA;
SIMULATED_IIC_2_SCL_DIR = GPIO_DIR_OUT; // SCL输出0,此时SCL = 0
SIMULATED_IIC_2_SCL = 0;
Simulated_IIC_2_Delay( );
Simulated_IIC_2_Delay( );
}
return Data;
}
/******************************************************************************
函数名：IIC_Transmit_ACK
功 能：向IIC总线上发送确认信号
参 数：ACK：确认信号的类型： SIMULATED_IIC_2_ACK 肯定应答
IIC_NAK 否定应答
返回值：无
******************************************************************************/
void Simulated_IIC_2_Transmit_ACK(uint8_t ACK)
{
u8SimulatedIIC2ReceivedACK = SIMULATED_IIC_2_INVALID_ACK;
if ( ACK > SIMULATED_IIC_2_NAK )
return;
if ( ACK )
SIMULATED_IIC_2_SDA_DIR = GPIO_DIR_IN; // SDA被设置为输入,IO口为高阻状态,总线上SDA信号由上拉电阻拉高,此时SDA = 1
else
{
SIMULATED_IIC_2_SDA_DIR = GPIO_DIR_OUT; // SDA输出0,此时SDA = 0
SIMULATED_IIC_2_OUT_SDA = 0;
}
Simulated_IIC_2_Delay( );
SIMULATED_IIC_2_SCL_DIR = GPIO_DIR_IN; // SCL被设置为输入,IO口为高阻状态,总线上SCL信号由上拉电阻拉高,此时SCL = 1
Simulated_IIC_2_Delay( );
Simulated_IIC_2_Delay( );
SIMULATED_IIC_2_SCL_DIR = GPIO_DIR_OUT; // SCL输出0,此时SCL = 0
SIMULATED_IIC_2_SCL = 0;
Simulated_IIC_2_Delay( );
}
/******************************************************************************
函数名：IIC_Receive_ACK
功 能：获取从总线上接收到的确认信号
参 数：无
返回值：总线上器件的确认信号类型：Simulated_IIC_ACK 肯定应答
SIMULATED_IIC_2_NAK 否定应答
IIC_INVALID_ACK 无效的应答信号(应答信号还未收到)
******************************************************************************/
uint8_t Simulated_IIC_2_Receive_ACK(void)
{
uint8_t ACK;
ACK = u8SimulatedIIC2ReceivedACK;
u8SimulatedIIC2ReceivedACK = SIMULATED_IIC_2_INVALID_ACK;
return ACK;
}
/******************************************************************************
函数名：IIC_Delay
功 能：延时5us,用于收发过程中的时序控制
注意：必须调整IIC_5us_DELAY_CALIBRATION参数校准延时时间在5us左右
参 数：ACK：确认信号的类型 0 - ACK 1 - NAK
返回值：无
******************************************************************************/
void Simulated_IIC_2_Delay(void)
{
uint8_t i;
for ( i = 0; i < SIMULATED_IIC_2_FREQ_CALIBRATION; i++ )
{
nop( );
}
}