GD32 模拟IIC程序驱动

/*******************************************************************************

file : platform_iic.c

author : huohongpeng 

date : 2017-02-23

description : application for IIC, base on gd lib (GPIO)

*******************************************************************************/

#include "platform_iic.h"

#include "platform_delay.h"

#include "gd32f1x0.h"

 

 

#define iic_printf printf("[%d-%s()] : ",__LINE__, __FUNCTION__);printf

 

/**

description : IIC delay us function interface

param :  us - microsecond count

retval : None

author : huohongpeng

date : 2017-02-23

*/

static void iic_delay_us(int us)

{

    delay_us(us);

}

 

/**

description : IIC SCL to high

param :  None

retval : None

author : huohongpeng

date : 2017-02-23

*/

static void iic_scl_h(void)

{

    GPIO_SetBits(GPIOB, GPIO_PIN_13);

}

 

/**

description : IIC SCL to low

param :  None

retval : None

author : huohongpeng

date : 2017-02-23

*/

static void iic_scl_l(void)

{

    GPIO_ResetBits(GPIOB, GPIO_PIN_13);

}

 

/**

description : IIC write one bit data to sda

param :  bit - 0, 1

retval : None

author : huohongpeng

date : 2017-02-23

*/

static void iic_write_sda(unsigned char bit)

{

    if(bit == 0)

    {

        GPIO_ResetBits(GPIOB, GPIO_PIN_15);

    }

    else   

    {

        GPIO_SetBits(GPIOB, GPIO_PIN_15);

    }

}

 

/**

description : IIC read one bit data to sda

param :  None

retval : bit - 0, 1

author : huohongpeng

date : 2017-02-23

*/

static unsigned char iic_read_sda(void)

{

    if(GPIO_ReadInputBit(GPIOB, GPIO_PIN_15) == Bit_SET)

    {

        return 0x01;

    }

    else 

    {

        return 0x00;

    }  

}

 

/**

description : IIC SCL and SDA init

param :  None

retval : None

author : huohongpeng

date : 2017-02-23

*/

void iic_init(void)

{

    GPIO_InitPara GPIO_InitParaStruct;

 

    /* iic interface */

    RCC_AHBPeriphClock_Enable(RCC_AHBPERIPH_GPIOB, ENABLE);

 

    GPIO_InitParaStruct.GPIO_Mode = GPIO_MODE_OUT;      

    GPIO_InitParaStruct.GPIO_PuPd = GPIO_PUPD_PULLUP;

    GPIO_InitParaStruct.GPIO_Speed = GPIO_SPEED_50MHZ;

    GPIO_InitParaStruct.GPIO_OType = GPIO_OTYPE_PP;

    GPIO_InitParaStruct.GPIO_Pin = GPIO_PIN_13;  

    GPIO_Init(GPIOB, &GPIO_InitParaStruct);

 

    GPIO_InitParaStruct.GPIO_OType = GPIO_OTYPE_OD;

    GPIO_InitParaStruct.GPIO_Pin = GPIO_PIN_15;

    GPIO_Init(GPIOB, &GPIO_InitParaStruct);

 

    GPIO_SetBits(GPIOB, GPIO_PIN_13);

    GPIO_SetBits(GPIOB, GPIO_PIN_15);

 

}

 

/**

description : IIC send start 

param :  None

retval : None

author : huohongpeng

date : 2017-02-23

*/

void iic_start(void)

{

    iic_write_sda(1);

    iic_scl_h();

    iic_delay_us(1);

 

    iic_write_sda(0);

    iic_delay_us(1);

 

    iic_scl_l();

    iic_delay_us(1);

}

 

/**

description : IIC send stop 

param :  None

retval : None

author : huohongpeng

date : 2017-02-23

*/

void iic_stop(void)

{

    iic_scl_l();

    iic_delay_us(1);

    iic_write_sda(0);

 

    iic_scl_h();

    iic_delay_us(1);

 

    iic_write_sda(1);

    iic_delay_us(1);

}

 

/**

description : IIC read one byte data 

param :  None

retval : one byte data

author : huohongpeng

date : 2017-02-23

*/

unsigned char iic_read_byte(void)

{

    int i, data;

 

    for(i = 0, data = 0; i < 8; i++)

    {

        data <<= 1;

        iic_scl_h();

        iic_delay_us(1);

        data |= iic_read_sda();

        iic_scl_l();

        iic_delay_us(1);

    }

 

    return data;

}

 

/**

description : IIC write one byte data 

param :  one byte data

retval : None

author : huohongpeng

date : 2017-02-23

*/

void iic_write_byte(unsigned char data)

{

    int i;

 

    for(i = 0; i < 8; i++)

    {

        iic_write_sda((data & 0x80)>>7);

        iic_delay_us(1);

        iic_scl_h();

        iic_delay_us(1);

        iic_scl_l();

        iic_delay_us(1);

        data <<= 1;

    } 

 

}

 

/**

description : IIC wait device ack

param :  None

retval : 0 - success

         1 - error

author : huohongpeng

date : 2017-02-23

*/

unsigned char iic_wait_ack(void)

{

    iic_write_sda(0x01);

    iic_delay_us(1);

    iic_scl_h();

    iic_delay_us(1);

    

    if(iic_read_sda() == 0)

    {

        iic_scl_l();

        iic_delay_us(1);

 

        return 0;

    }

    else 

    {

        iic_printf("stop \r\n");

        iic_stop();

        return 1;

    }

}

 

/**

description : IIC send ack or nack to device

param :  None

retval : None

author : huohongpeng

date : 2017-02-23

*/

void iic_ack(unsigned char ack_nack)

{

    iic_write_sda(ack_nack);

    iic_delay_us(1);

    iic_scl_h();

    iic_delay_us(1);

    iic_scl_l();

    iic_delay_us(1);

}



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