Lpc1788io Mouth Simulated IIC

#ifndef __myiic_h_

#define __myiic_h_

#include "Common.h"

#include "Delay.h"

#include "debugserial.h"

SDA 027 SCL 028

IO direction setting

#define IIC1_SDA_IN () p0dir (27) = 0

#define IIC1_SDA_OUT () p0dir (27) = 1

IO operation function

#define IIC1_READ_SDA p0in (27)//input SDA

void My_iic_init(void); Initializing the IO port of the IIC

void My_iic_start(void); Send IIC start signal

void My_iic_stop(void); Send IIC Stop signal

void My_iic_sendbyte(u8 txd); IIC sends a byte

U8 my_iic_readbyte(void); //iic reads one byte

U8 my_iic_waitack(void); IIC waits for ACK signal

void My_iic_ack(void); IIC sends ACK signal

void My_iic_nack(void); IIC does not send an ACK signal

#endif

#include "myiic.h"

The drive is designed for simulating IIC operations

void My_iic_init(void) //initialization of IIC IO port

{

LPC_SC, Pconp |= (1<<);

Lpc_iocon-p0_27 = 0x00; Select Gpio function, disable hysteresis not reverse normal push-pull

Lpc_iocon, p0_27 |= (1<<8); Related to pin configuration modification according to the actual pin

Lpc_iocon-p0_28 = 0x00; Select Gpio function, disable hysteresis not reverse normal push-pull

Lpc_iocon, p0_28 |= (1<<8); Related to pin configuration modification according to the actual pin

P0dir(+) = 1; SCL output

P0dir(+) = 1; SDA output

P0high(+) = 1; Initialization is high level

P0high(+) = 1;

}

void My_iic_start(void) //Send IIC start signal

{

Iic1_sda_out(); SDA Line output

P0high(+) =1; SDA High

P0high(+) =1; SCL High

Delayus(5);

P0low(+) =1; SDA Low

Delayus(5);

P0low(+) =1; SCL Low

}

void My_iic_stop(void) //Send IIC stop signal

{

Iic1_sda_out(); SDA Line output

P0high(+) =1; SCL High

P0low(+) =1; SDA Low

Delayus(5);

P0high(+) =1; Send I²c bus end signal SDA high

Delayus(5);

}

void My_iic_sendbyte(u8 txd) //iic send a byte

{

U8 T;

Iic1_sda_out();

for (t=0; T<8; T+ +)

{

if (((txd&0x80) >>7))

P0high(+) = 1;

Else

P0low(+) = 1;

Txd<<=1;

P0high(+) =1; SCL High

Delayus(5);

P0low(+) =1; SCL Low

Delayus(5);

}

}

U8 my_iic_readbyte(void) //iic reads one byte

{

unsigned char i,receive=0;

Iic1_sda_in(); SDA set to input

for (i=0; I<8; I+ + )

{

Receive<<=1;

P0high(+) =1; SCL High

Delayus(5);

if (IIC1_READ_SDA)receive+ +;

P0low(+) =1; SCL Low

Delayus(5);

}

return receive;

}

U8 my_iic_waitack(void) //IIC wait for ACK signal

{

U8 ucerrtime=0;

Iic1_sda_out();

P0high(+) =1; SDA High

Delayus(5);

Iic1_sda_in(); SDA set to input

P0high(+) =1; SCL High

Delayus(5);

while (iic1_read_sda)

{

Ucerrtime+ +;

Delayus(1);

if (ucerrtime>)

{

My_iic_stop();

return 1;

}

}

P0low(+) =1; Clock output SCL Low

Delayus(5);

return 0;

}

void My_iic_ack(void) //IIC sends an ACK signal

{

Iic1_sda_out();

P0low(+) =1; SDA Low

Delayus(2);

P0high(+) =1; SCL High

Delayus(5);

P0low(+) =1; SCL Low

Delayus(5);

}

void My_iic_nack(void) //IIC does not send an ACK signal

{

Iic1_sda_out();

P0high(+) =1; SDA High

Delayus(2);

P0high(+) =1; SCL High

Delayus(5);

P0low(+) =1; SCL Low

Delayus(5);

}

Lpc1788io Mouth Simulated IIC