ch452程序代码 (2).doc

Ch452程序代码/*/* FileName: ch452.h */* Function: */*-History-*/* Author | Date | Status | Description */* wang | 2011/8/04 | create | */* | | | */*/#ifndef _CH452_H#define _CH452_H/#ifndef_CH452A_H_/#define_CH452A_H_/*Define command*/#defineCMD_SYSPARA0x68/definiton for system parameter commanddefault:0#defineDISP0x01/0:disable 1:enable#defineKEYB0x02/0:disable 1:enable#define WDOG0x04/0:close1:open#defineDPLR0x08/0:low level1:high level#defineSSPD0x10/0:low speed1:high speed#defineINTM0x20/0:low level1:low level pulse#defineGPOE0x40/0:all DIG as driver1:DIG6 DIG7 as GPIO#defineCMD_DISPARA0x6A/definiton for display parameter commanddefault:0#defineMODE0x80/0:No decode1:BCD decode/#defineLIMIT0x70/bit6bit4 range from 000 to 111#defineINTENSITY0x0F/bit3bit0 range from 0000 to 1111#defineCMD_DISPDAT0x70/加载字数据前八位#defineCMD_GETKEY0x6E/键盘前八位#defineCMD_ACKEN0x6E/2线接口应答前八位/*Function prototype*/void ch452a_two_ack(void);void ch452a_Init (void);void ch452a_sendcmd(unsigned char cmd,unsigned char paradata);/写命令unsigned char ch452a_getkey(void);/读取按键unsigned char CH452_ReadKeyboard();#define KEY_UP0x59#define KEY_DOWN0x58#define KEY_LEFT0x5B#define KEY_RIGHT0x5A#define KEY_SET0x48#define KEY_OK0x40#endif主程序代码：/* FileName: ch452.c * Function: *-History-* Author | Date | Status | Description * wang | 2011/7/28 | create | * | | | */#include STC_NEW_8051.h#includeIIC.h#includeCh452.hsbit SCL=P10;sbit SDA=P11;/ FileName:ch452a_two_ack() / Function:Init_ack /void ch452a_two_ack()unsigned char i,wr_data;wr_data=CMD_ACKEN&0xfe;IIC_start();/* start condition */for(i=0;i8;i+)if(wr_data&0x80)/判断高位数据SDA=1;elseSDA=0;wr_data=1;/让高位数据往左移delays(1);SCL=1;/数据的写要在时钟为高电平时delays(4);SCL=0;delays(5); /* nine clock */SCL=0;delays(1);SDA=1;delays(4);SCL=1;delays(5);/* send data */for(i=0;i8;i+)SCL = 0;delays(1);SDA= 0;delays(4);SCL= 1;delays(5);IIC_stop();/ FileName:ch452a_Init() / Function:Init /void ch452a_Init(void)unsigned char cmddata,cmdadr;ch452a_two_ack();cmddata=CMD_SYSPARA;/系统参数地址cmdadr=DISP| KEYB & (INTM) & (DPLR);/系统参数数据IIC_writedata(cmddata,&cmdadr,1);cmddata=CMD_DISPARA;/显示参数地址cmdadr=MODE; IIC_writedata(cmddata,&cmdadr,1);/FunctionName:ch452a_sendcmd()/Description:send command to ch452a /void ch452a_sendcmd (unsigned char cmd,unsigned char paradata)unsigned char cmddata,cmdadr;cmddata=cmd;cmdadr=paradata;IIC_writedata(cmddata,&cmdadr,1); /FunctionName:ch452a_getkey()/Description:get key value from ch452a /unsigned char ch452a_getkey()unsigned char cmddata,keycode;/unsigned char*pData=&revdata;cmddata=CMD_GETKEY | 0x01; keycode=IIC_readdata(cmddata);return keycode;/*unsigned char CH452_ReadKeyboard()unsigned char recvdata,cmddata; unsigned char ack;/ uchar* pRecvData = &recvdata;cmddata = CMD_GETKEY | 0x01;IIC_start(); /启动IIC_send(cmddata); /发送从机地址ack=IIC_re_ack(ack);if(ack=0)recvdata = IIC_accept(cmddata);IIC_wr_ack(0); /主机发送应答给从机IIC_stop();else IIC_stop(); /ack条件不满足终止发送数据return recvdata