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Simulation_IIC.c

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YcChan
2016-12-27 21:09:11 +08:00
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commit f0df3f83ef
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#include"stm32f1ox.h"
/*模拟IIC端口IO定义*/
#define SCL_H GPIOB->BSRR = GPIO_Pin_6
#define SCL_L GPIOB->BRR = GPIO_Pin_6
#define SDA_H GPIOB->BSRR = GPIO_Pin_7
#define SDA_L GPIOB->BRR = GPIO_Pin_7
//#define SCL_read GPIOB->IDR & GPIO_Pin_6
#define SDA_read GPIOB->IDR & GPIO_Pin_7
void I2C_GPIO_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD;
GPIO_Init(GPIOB, &GPIO_InitStructure);
}
void I2C_delay(void)
{
u8 i=30; //the min of i is 5
while(i)
{
i--;
}
}
void delay5ms(void)
{
int i=5000;
while(i)
{
i--;
}
}
/*******************************************************************************
* Function Name : I2C_Start
* Description : Master Start Simulation IIC Communication
* Input : None
* Output : None
* Return : Wheather Start
****************************************************************************** */
bool I2C_Start(void)
{
SDA_H;
SCL_H;
I2C_delay();
if(!SDA_read)return FALSE; //if SDA is 0 , then BUS is busy
SDA_L;
I2C_delay();
if(SDA_read) return FALSE; //if SDA is 1 , then BUS occur error
SDA_L;
I2C_delay();
return TRUE;
}
/*******************************************************************************
* Function Name : I2C_Stop
* Description : Master Stop Simulation IIC Communication
* Input : None
* Output : None
* Return : None
****************************************************************************** */
void I2C_Stop(void)
{
SCL_L;
I2C_delay();
SDA_L;
I2C_delay();
SCL_H;
I2C_delay();
SDA_H;
I2C_delay();
}
/*******************************************************************************
* Function Name : I2C_Ack
* Description : Master Send Acknowledge Single
* Input : None
* Output : None
* Return : None
****************************************************************************** */
void I2C_Ack(void)
{
SCL_L;
I2C_delay();
SDA_L;
I2C_delay();
SCL_H;
I2C_delay();
SCL_L;
I2C_delay();
}
/*******************************************************************************
* Function Name : I2C_NoAck
* Description : Master Send No Acknowledge Single
* Input : None
* Output : None
* Return : None
****************************************************************************** */
void I2C_NoAck(void)
{
SCL_L;
I2C_delay();
SDA_H;
I2C_delay();
SCL_H;
I2C_delay();
SCL_L;
I2C_delay();
}
/*******************************************************************************
* Function Name : I2C_WaitAck
* Description : Master Reserive Slave Acknowledge Single
* Input : None
* Output : None
* Return : Wheather Reserive Slave Acknowledge Single
****************************************************************************** */
bool I2C_WaitAck(void) //return 1 - Ack ;return 0 - NoAck
{
SCL_L;
I2C_delay();
SDA_H;
I2C_delay();
SCL_H;
I2C_delay();
if(SDA_read)
{
SCL_L;
I2C_delay();
return FALSE;
}
SCL_L;
I2C_delay();
return TRUE;
}
/*******************************************************************************
* Function Name : I2C_SendByte
* Description : Master Send a Byte to Slave
* Input : Will Send Date
* Output : None
* Return : None
****************************************************************************** */
void I2C_SendByte(u8 SendByte) //MSB
{
u8 i=8;
while(i--)
{
SCL_L;
I2C_delay();
if(SendByte&0x80)
SDA_H;
else
SDA_L;
SendByte<<=1;
I2C_delay();
SCL_H;
I2C_delay();
}
SCL_L;
}
/*******************************************************************************
* Function Name : I2C_RadeByte
* Description : Master Reserive a Byte From Slave
* Input : None
* Output : None
* Return : Date From Slave
****************************************************************************** */
unsigned char I2C_RadeByte(void)
{
u8 i=8;
u8 ReceiveByte=0;
SDA_H;
while(i--)
{
ReceiveByte<<=1;
SCL_L;
I2C_delay();
SCL_H;
I2C_delay();
if(SDA_read)
{
ReceiveByte|=0x01;
}
}
SCL_L;
return ReceiveByte;
}
bool Single_Write(unsigned char SlaveAddress,unsigned char REG_Address,unsigned char REG_data) //void
{
if(!I2C_Start())return FALSE;
I2C_SendByte(SlaveAddress);
I2C_SendByte(((REG_Address & 0x0700) >>7) | SlaveAddress & 0xFFFE); //ALTER
if(!I2C_WaitAck()){I2C_Stop(); return FALSE;}
I2C_SendByte(REG_Address );
I2C_WaitAck();
I2C_SendByte(REG_data);
I2C_WaitAck();
I2C_Stop();
delay5ms();
return TRUE;
}
unsigned char Single_Read(unsigned char SlaveAddress,unsigned char REG_Address)
{
unsigned char REG_data;
if(!I2C_Start())return FALSE;
I2C_SendByte(SlaveAddress);
I2C_SendByte(((REG_Address & 0x0700) >>7) | REG_Address & 0xFFFE);//ALTER
if(!I2C_WaitAck()){I2C_Stop();test=1; return FALSE;}
I2C_SendByte((u8) REG_Address);
I2C_WaitAck();
I2C_Start();
I2C_SendByte(SlaveAddress+1);
I2C_WaitAck();
REG_data= I2C_RadeByte();
I2C_NoAck();
I2C_Stop();
//return TRUE;
return REG_data;
}