/*!*     COPYRIGHT NOTICE*     Copyright (c) 2013,山外科技*     All rights reserved.*     技术讨论：山外论坛 http://www.vcan123.com**     除注明出处外，以下所有内容版权均属山外科技所有，未经允许，不得用于商业用途，*     修改内容时必须保留山外科技的版权声明。** @file       VCAN_SCCB.c* @brief      OV摄像头配置总线SCCB函数库* @author     山外科技* @version    v5.0* @date       2013-09-01*/#include "common.h"
#include "MK60_gpio.h"
#include "VCAN_SCCB.h"static void SCCB_delay(uint16 i);/*!*  @brief      SCCB延迟函数*  @param      time    延时时间*  @since      v5.0*/
static void SCCB_delay(volatile uint16 time)
{while(time){time--;}
}/*!*  @brief      SCCB管脚配置*  @since      v5.0*/
void SCCB_GPIO_init(void)
{gpio_init  (SCCB_SCL, GPO, 1); //初始化SCLgpio_init  (SCCB_SDA, GPO, 1); //初始化SDA
port_init_NoALT(SCCB_SCL,ODO | PULLUP);port_init_NoALT(SCCB_SDA,ODO | PULLUP);
}/*!*  @brief      SCCB起始信号*  @since      v5.0*/
static uint8 SCCB_Start(void)
{SDA_H();SCL_H();SCCB_DELAY();SDA_DDR_IN();if(!SDA_IN()){SDA_DDR_OUT();return 0;   /* SDA线为低电平则总线忙,退出 */}SDA_DDR_OUT();SDA_L();SCCB_DELAY();SCL_L();if(SDA_IN()){SDA_DDR_OUT();return 0;   /* SDA线为高电平则总线出错,退出 */}//SDA_DDR_OUT();//SDA_L();//SCCB_delay();return 1;
}/*!*  @brief      SCCB停止信号*  @since      v5.0*/
static void SCCB_Stop(void)
{SCL_L();//SCCB_DELAY();
    SDA_L();SCCB_DELAY();SCL_H();SCCB_DELAY();SDA_H();SCCB_DELAY();
}/*!*  @brief      SCCB应答信号*  @since      v5.0*/
static void SCCB_Ack(void)
{SCL_L();SCCB_DELAY();SDA_L();SCCB_DELAY();SCL_H();SCCB_DELAY();SCL_L();SCCB_DELAY();
}/*!*  @brief      SCCB无应答信号*  @since      v5.0*/
static void SCCB_NoAck(void)
{SCL_L();SCCB_DELAY();SDA_H();SCCB_DELAY();SCL_H();SCCB_DELAY();SCL_L();SCCB_DELAY();
}/*!*  @brief      SCCB 等待应答*  @return     应答结果（0表示无应答，1表示有应答）*  @since      v5.0*/
static int SCCB_WaitAck(void)
{SCL_L();//SDA_H();
    SDA_DDR_IN();SCCB_DELAY();SCL_H();SCCB_DELAY();if(SDA_IN())           //应答为高电平，异常，通信失败
    {SDA_DDR_OUT();SCL_L();return 0;}SDA_DDR_OUT();SCL_L();return 1;
}/*!*  @brief      SCCB 发送的数据*  @param      SendByte    需要发送的数据*  @since      v5.0*/
static void SCCB_SendByte(uint8 SendByte)
{uint8 i = 8;while(i--){if(SendByte & 0x80)     //SDA 输出数据
        {SDA_H();}else{SDA_L();}SendByte <<= 1;SCCB_DELAY();SCL_H();                //SCL 拉高，采集信号
        SCCB_DELAY();SCL_L();                //SCL 时钟线拉低//SCCB_DELAY();
    }//SCL_L();
}/*!*  @brief      接收SCCB总线的数据*  @return     接收到的数据*  @since      v5.0*/
static int SCCB_ReceiveByte(void)
{uint8 i = 8;uint8 ReceiveByte = 0;//SDA_H();//SCCB_DELAY();
    SDA_DDR_IN();while(i--){ReceiveByte <<= 1;SCL_L();SCCB_DELAY();SCL_H();SCCB_DELAY();if(SDA_IN()){ReceiveByte |= 0x01;}}SDA_DDR_OUT();SCL_L();return ReceiveByte;
}/*****************************************************************************************
* 函数名：SCCB_WriteByte
* 描述  ：写一字节数据
* 输入  ：- WriteAddress: 待写入地址    - SendByte: 待写入数据  - DeviceAddress: 器件类型
* 输出  ：返回为:=1成功写入,=0失败
* 注意  ：无
*****************************************************************************************/
static int SCCB_WriteByte_one( uint16 WriteAddress , uint8 SendByte );int SCCB_WriteByte( uint16 WriteAddress , uint8 SendByte )            //考虑到用sccb的管脚模拟，比较容易失败，因此多试几次
{uint8 i = 0;while( 0 == SCCB_WriteByte_one ( WriteAddress, SendByte ) ){i++;if(i == 20){return 0 ;}}return 1;
}int SCCB_WriteByte_one( uint16 WriteAddress , uint8 SendByte )
{if(!SCCB_Start()){return 0;}SCCB_SendByte( DEV_ADR );                    /* 器件地址 */if( !SCCB_WaitAck() ){SCCB_Stop();return 0;}SCCB_SendByte((uint8)(WriteAddress & 0x00FF));   /* 设置低起始地址 */SCCB_WaitAck();SCCB_SendByte(SendByte);SCCB_WaitAck();SCCB_Stop();return 1;
}/******************************************************************************************************************* 函数名：SCCB_ReadByte* 描述  ：读取一串数据* 输入  ：- pBuffer: 存放读出数据  - length: 待读出长度    - ReadAddress: 待读出地址        - DeviceAddress: 器件类型* 输出  ：返回为:=1成功读入,=0失败* 注意  ：无**********************************************************************************************************************/
static int SCCB_ReadByte_one(uint8 *pBuffer,   uint16 length,   uint8 ReadAddress);int SCCB_ReadByte(uint8 *pBuffer,   uint16 length,   uint8 ReadAddress)
{uint8 i = 0;while( 0 == SCCB_ReadByte_one(pBuffer, length, ReadAddress) ){i++;if(i == 30){return 0 ;}}return 1;
}int SCCB_ReadByte_one(uint8 *pBuffer,   uint16 length,   uint8 ReadAddress)
{if(!SCCB_Start()){return 0;}SCCB_SendByte( DEV_ADR );         /* 器件地址 */if( !SCCB_WaitAck() ){SCCB_Stop();return 0;}SCCB_SendByte( ReadAddress );           /* 设置低起始地址 */SCCB_WaitAck();SCCB_Stop();if(!SCCB_Start()){return 0;}SCCB_SendByte( DEV_ADR + 1 );               /* 器件地址 */if(!SCCB_WaitAck()){SCCB_Stop();return 0;}while(length){*pBuffer = SCCB_ReceiveByte();if(length == 1){SCCB_NoAck();}else{SCCB_Ack();}pBuffer++;length--;}SCCB_Stop();return 1;
}