/*
 * drv_i2c.c
 *
 *  Created on: Mar 31, 2023
 *      Author: gxms0
 */

#include "drv_i2c.h"



/**********************************************************************
*@Note:
AT24Cxx��

READ EEPROM��Start + 0xA0 + 8bit Data Address + Start + 0xA1 + Read Data + Stop.
WRITE EERPOM��Start + 0xA0 + 8bit Data Address + Write Data + Stop.
*******************************************************************************/
/* EERPOM DATA ADDRESS Length Definition */
#define Address_8bit  0
#define Address_16bit  1

/* EERPOM DATA ADDRESS Length Selection */
#define Address_Lenth   Address_16bit
//#define Address_Lenth   Address_16bit

/* Global define */
#define SIZE sizeof(TEXT_Buffer)

/* Global Variable */
const u8 TEXT_Buffer[]={"CH32F10x I2C TEST"};

/*********************************************************************
 * @fn      IIC_Init
 *
 * @brief   Initializes the IIC peripheral.
 *
 * @return  none
 */
void IIC_Init(u32 bound, u16 address)
{
    GPIO_InitTypeDef GPIO_InitStructure={0};
    I2C_InitTypeDef I2C_InitTSturcture={0};

    RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOB, ENABLE );
    RCC_APB1PeriphClockCmd( RCC_APB1Periph_I2C2, ENABLE );

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init( GPIOB, &GPIO_InitStructure );

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init( GPIOB, &GPIO_InitStructure );

    I2C_InitTSturcture.I2C_ClockSpeed = bound;
    I2C_InitTSturcture.I2C_Mode = I2C_Mode_I2C;
    I2C_InitTSturcture.I2C_DutyCycle = I2C_DutyCycle_2;
    I2C_InitTSturcture.I2C_OwnAddress1 = address;
    I2C_InitTSturcture.I2C_Ack = I2C_Ack_Enable;
    I2C_InitTSturcture.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
    I2C_Init( I2C2, &I2C_InitTSturcture );

    I2C_Cmd( I2C2, ENABLE );

    I2C_AcknowledgeConfig( I2C2, ENABLE );
}

/*********************************************************************
 * @fn      AT24CXX_Init
 *
 * @brief   Initializes AT24xx EEPROM.
 *
 * @return  none
 */
void AT24CXX_Init(void)
{
    IIC_Init( 100000, 0xA0);
}

/*********************************************************************
 * @fn      AT24CXX_ReadOneByte
 *
 * @brief   Read one data from EEPROM.
 *
 * @param   ReadAddr - Read frist address.
 *
 * @return  temp - Read data.
 */
u8 AT24CXX_ReadOneByte(u16 ReadAddr)
{
    u8 temp=0;

    while( I2C_GetFlagStatus( I2C2, I2C_FLAG_BUSY ) != RESET );
    I2C_GenerateSTART( I2C2, ENABLE );

    while( !I2C_CheckEvent( I2C2, I2C_EVENT_MASTER_MODE_SELECT ) );
    I2C_Send7bitAddress( I2C2, 0XA0, I2C_Direction_Transmitter );

    while( !I2C_CheckEvent( I2C2, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED ) );

#if (Address_Lenth  == Address_8bit)
    I2C_SendData( I2C2, (u8)(ReadAddr&0x00FF) );
    while( !I2C_CheckEvent( I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED ) );

#elif (Address_Lenth  == Address_16bit)
    I2C_SendData( I2C2, (u8)(ReadAddr>>8) );
    while( !I2C_CheckEvent( I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED ) );

    I2C_SendData( I2C2, (u8)(ReadAddr&0x00FF) );
    while( !I2C_CheckEvent( I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED ) );

#endif

    I2C_GenerateSTART( I2C2, ENABLE );

    while( !I2C_CheckEvent( I2C2, I2C_EVENT_MASTER_MODE_SELECT ) );
    I2C_Send7bitAddress( I2C2, 0XA0, I2C_Direction_Receiver );

    while( !I2C_CheckEvent( I2C2, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED ) );
  while( I2C_GetFlagStatus( I2C2, I2C_FLAG_RXNE ) ==  RESET )
    I2C_AcknowledgeConfig( I2C2, DISABLE );

    temp = I2C_ReceiveData( I2C2 );
  I2C_GenerateSTOP( I2C2, ENABLE );

    return temp;
}

/*********************************************************************
 * @fn      AT24CXX_WriteOneByte
 *
 * @brief   Write one data to EEPROM.
 *
 * @param   WriteAddr - Write frist address.
 *
 * @return  DataToWrite - Write data.
 */
void AT24CXX_WriteOneByte(u16 WriteAddr, u8 DataToWrite)
{
    while( I2C_GetFlagStatus( I2C2, I2C_FLAG_BUSY ) != RESET );
    I2C_GenerateSTART( I2C2, ENABLE );

    while( !I2C_CheckEvent( I2C2, I2C_EVENT_MASTER_MODE_SELECT ) );
    I2C_Send7bitAddress( I2C2, 0XA0, I2C_Direction_Transmitter );

    while( !I2C_CheckEvent( I2C2, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED ) );

#if (Address_Lenth  == Address_8bit)
    I2C_SendData( I2C2, (u8)(WriteAddr&0x00FF) );
    while( !I2C_CheckEvent( I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED ) );

#elif (Address_Lenth  == Address_16bit)
    I2C_SendData( I2C2, (u8)(WriteAddr>>8) );
    while( !I2C_CheckEvent( I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED ) );

    I2C_SendData( I2C2, (u8)(WriteAddr&0x00FF) );
    while( !I2C_CheckEvent( I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED ) );

#endif

    if( I2C_GetFlagStatus( I2C2, I2C_FLAG_TXE ) !=  RESET )
    {
        I2C_SendData( I2C2, DataToWrite );
    }

    while( !I2C_CheckEvent( I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED ) );
    I2C_GenerateSTOP( I2C2, ENABLE );
}

/*********************************************************************
 * @fn      AT24CXX_Read
 *
 * @brief   Read multiple data from EEPROM.
 *
 * @param   ReadAddr - Read frist address. (AT24c02: 0~255)
 *          pBuffer - Read data.
 *          NumToRead - Data number.
 *
 * @return  none
 */
void AT24CXX_Read(u16 ReadAddr, u8 *pBuffer, u16 NumToRead)
{
    while(NumToRead)
    {
        *pBuffer++=AT24CXX_ReadOneByte(ReadAddr++);
        NumToRead--;
    }
}

/*********************************************************************
 * @fn      AT24CXX_Write
 *
 * @brief   Write multiple data to EEPROM.
 *
 * @param   WriteAddr - Write frist address. (AT24c02: 0~255)
 *          pBuffer - Write data.
 *          NumToWrite - Data number.
 *
 * @return  none
 */
void AT24CXX_Write(u16 WriteAddr, u8 *pBuffer, u16 NumToWrite)
{
    while(NumToWrite--)
    {
        AT24CXX_WriteOneByte(WriteAddr,*pBuffer);
        WriteAddr++;
        pBuffer++;
        Delay_Ms(2);
    }
}