ht1621b.c

倒车雷达的原理图与源码

/*
***************************************************************************************************
* Copyright (C),2007
* Author        : YanZhongsan
* Email         : [e-mail]
* Date          : 2007-10-17
* File name     : HT1621B.c
* Description   : HT1621B driver file
* Version       : V1.0
* Others        : Before any command or read/write ,should initialized the chip by Init_HT1621B
*               : function
***************************************************************************************************
*/

/** include files **/
#include "includes.h"
#include "HT1621B.h"

/*
***************************************************************************************************
* Function name : Init_HT1621B
* Description   : Initialized the TH1621B
* Note          : After Power on reset or disable display shoule reinitialized the chip
* Parameters    : None
* Returns       : None
* Attribute     : Public function
* Others        : None
***************************************************************************************************
*/
void Init_HT1621B(void)
{
    HT1621BSendCommand(HT_SUB_NORMAL);

    HT1621BSendCommand(HT_SUB_SYS_ENABLE);

    HT1621BSendCommand(HT_SUB_LCD_ON);

    HT1621BSendCommand(HT_SUB_BIAS13_4);

    HT1621BSendCommand(HT_SUB_BIAS12_4);
}

/*
***************************************************************************************************
* Function name : HT1621BClearAll
* Description   : Clear all data in RAM,nothing displaying
* Note          : The data in the display RAM control display,1:display,0:nodisplay
* Parameters    : None
* Returns       : None
* Attribute     : Public function
* Others        : If can't run,shoule modify the WR clock by DELAY_1us
***************************************************************************************************
*/
void HT1621BClearAll(void)
{
    UCHAR_8 counter;

    //Enable the serial interface first
    SET_HT_CS_LOW;

    //Send command 101
    SET_HT_WR_LOW;
    SET_HT_DATA_HIGH;
    DELAY_1us(2);
    SET_HT_WR_HIGH;
    DELAY_1us(2);

    SET_HT_WR_LOW;
    SET_HT_DATA_LOW;
    DELAY_1us(2);
    SET_HT_WR_HIGH;
    DELAY_1us(2);

    SET_HT_WR_LOW;
    SET_HT_DATA_HIGH;
    DELAY_1us(2);
    SET_HT_WR_HIGH;
    DELAY_1us(2);

    //Set the data wire to logic 0
    SET_HT_DATA_LOW;
    //Send the address and data,All 0,address will auto increase
    for (counter=0;counter<134;counter++)
    {
        SET_HT_WR_LOW;
        DELAY_1us(3);
        SET_HT_WR_HIGH;
        DELAY_1us(3);
    }

    //Disable the serial interface
    SET_HT_CS_HIGH;
}

/*
***************************************************************************************************
* Function name : HT1621BSendCommand
* Description   : Send command to the HT1621B,and just send the command!
* Note          : The sub-command is 9 bits,but bit0 is don't care,so,Just transfer 8bits
*               : subcommand's bit7-bit0 use as command's bit8-bit1
* Parameters    : UCHAR_8 sub_command,the real command that config the chip
* Returns       : None
* Attribute     : Public function
* Others        : The command is like this: 100-dddd-dddd-X
*               : d:sub-command bit,0 or 1
*               : X:don't care about it
***************************************************************************************************
*/
void HT1621BSendCommand(UCHAR_8 subcommand)
{
    SCHAR_8 counter;
    UINT_16 temp;

    temp = HT_COMMAND_COMMAND|(subcommand<<1);

    // Enable the serial interface first
    SET_HT_CS_LOW;

    for (counter=11;counter>=0;counter--)
    {
        SET_HT_WR_LOW;
        if (0x00==TESTBIT(temp,counter))
        {
            SET_HT_DATA_LOW;
        }
        else
        {
            SET_HT_DATA_HIGH;
        }
        DELAY_1us(3);
        SET_HT_WR_HIGH;
        DELAY_1us(3);
    }

    //Disable the serial interface at end
    SET_HT_CS_HIGH;
}

/*
***************************************************************************************************
* Function name : HT1621BWritedata
* Description   : write data to HT1621B
* Note          : This function is just used to write data to HT1621B,Don't used to
*               : send command,That is another one's work!!!!!
* Parameters    : UCHAR_8 addr,the address of HT1621's RAM,bit5-bit0 useful only
*               : UCHAR_8 data,will send to HT1621B,Two cells will be write
* Returns       : None
* Attribute     : Public function
* Others        : 1.CS signal low active the ship first
*               : 2.DATA signal will be clock into the HT1621 on the rising edge of WR signal
*               : 3.CS signal high terminate the data transmission,disable the serial interface
***************************************************************************************************
*/
void HT1621BWritedata(UCHAR_8 addr,const UCHAR_8 data)
{
    SCHAR_8 counter;
    UINT_16 temp;

    temp = HT_WRITE_COMMAND|(addr&0x3F);

    //Enable the serial interface
    SET_HT_CS_LOW;

    //Set the data line output
    SET_HT_DATA_OUT;

    //Send the command and address
    for (counter=8;counter>=0;counter--)
    {
        SET_HT_WR_LOW;
        if (0x00==TESTBIT(temp,counter))
        {
            SET_HT_DATA_LOW;
        }
        else
        {
            SET_HT_DATA_HIGH;
        }
        DELAY_1us(3);
        SET_HT_WR_HIGH;
        DELAY_1us(3);
    }

    //Send the data,LSB first
    for (counter=0;counter<8;counter++)
    {
        SET_HT_WR_LOW;
        if (0x00==TESTBIT(data,counter))
        {
            SET_HT_DATA_LOW;
        }
        else
        {
            SET_HT_DATA_HIGH;
        }
        DELAY_1us(3);
        SET_HT_WR_HIGH;
        DELAY_1us(3);
    }

    //Disable the serial interface
    SET_HT_CS_HIGH;
}