/* //管脚定义 #define I2C_SCL RB6 #define I2C_SDA RB7 volatile bit I2C_SCL_IO @((unsigned)&TRISB*8)+6; //IB口方向设置 volatile bit I2C_SDA_IO @((unsigned)&TRISB*8)+7; //IB口方向设置
unsigned char I2C_Read1bYTE(unsigned char ack);//用于触摸仿真工具 unsigned char I2C_Write1bYTE(unsigned char data); //----------------------------------------------------------------------------- //函数声明 void DataPro(void);
extern unsigned int TKDATA0; //按键旧值
unsigned char I2C_Read1bYTE(unsigned char ack); unsigned char I2C_Write1bYTE(unsigned char data); void I2C_WaitMoment(); void I2C_WriteStop(); void I2C_WriteStart();
uint TKdata[16]; void DataPro(void) { uchar checksum = 5; asm("clrwdt"); //Key_Test(); //检测按键值 checksum *= 3; //在此之前的checksum表示按键个数 checksum += 2; //在此之后的checksum表示校验和 //-----------------与软件通讯规则为 0xA0+数据个数+数据+检验和------------------ I2C_WriteStart(); I2C_Write1bYTE(0xa0); //建立连接的命令 I2C_Write1bYTE(checksum); //数据个数为 X*2+2 X表示按键个数 //KEY7 I2C_Write1bYTE(0x07); I2C_Write1bYTE(TKdata[6] & 0xff); //键值数据低位 I2C_Write1bYTE((TKdata[6]>>8) & 0xff); //键值数据高位 checksum += 7; checksum += (TKdata[6] & 0xff); //检验和= 数据个数+键值数据的总和 checksum += ((TKdata[6]>>8) & 0xff); //KEY8 I2C_Write1bYTE(0x08); I2C_Write1bYTE(TKdata[7] & 0xff); //键值数据低位 I2C_Write1bYTE((TKdata[7]>>8) & 0xff); //键值数据高位 checksum += 8; checksum += (TKdata[7] & 0xff); //检验和= 数据个数+键值数据的总和 checksum += ((TKdata[7]>>8) & 0xff); //KEY12 I2C_Write1bYTE(0x0C); I2C_Write1bYTE(TKdata[11] & 0xff); //键值数据低位 I2C_Write1bYTE((TKdata[11]>>8) & 0xff); //键值数据高位 checksum += 0x0C; checksum += (TKdata[11] & 0xff); //检验和= 数据个数+键值数据的总和 checksum += ((TKdata[11]>>8) & 0xff); //KEY13 I2C_Write1bYTE(0x0D); I2C_Write1bYTE(TKdata[12] & 0xff); //键值数据低位 I2C_Write1bYTE((TKdata[12]>>8) & 0xff); //键值数据高位 checksum += 0x0D; checksum += (TKdata[12] & 0xff); //检验和= 数据个数+键值数据的总和 checksum += ((TKdata[12]>>8) & 0xff); //KEY14 I2C_Write1bYTE(0x0E); I2C_Write1bYTE(TKdata[13] & 0xff); //键值数据低位 I2C_Write1bYTE((TKdata[13]>>8) & 0xff); //键值数据高位 checksum += 0x0E; checksum += (TKdata[13] & 0xff); //检验和= 数据个数+键值数据的总和 checksum += ((TKdata[13]>>8) & 0xff);
I2C_Write1bYTE(checksum); //发校验和 I2C_WriteStop(); //结束 } //IIC函数 //起始信号-在SCL为高电平时，SDA线上发生从高到低的电平变化 void I2C_WriteStart() { I2C_SDA_IO = 0; I2C_SCL_IO = 0; I2C_WaitMoment(); I2C_SDA = 1; //先将SDA=1，以准备在SCL=1时，将SDA=0 I2C_SCL = 1; //时钟总线拉高 I2C_WaitMoment(); I2C_SDA = 0; //SCL=1时，将SDA拉低即产生启动信号 I2C_WaitMoment(); I2C_SCL = 0; //将SCL=0，完成启动信号操作 I2C_WaitMoment(); }
//结束信号-在SCL为高电平时，SDA线上发生从低到高的电平变化 void I2C_WriteStop() { I2C_SDA_IO = 0; I2C_SCL_IO = 0; I2C_WaitMoment(); I2C_SDA = 0; //先将SDA=0，以准备在SCL=1时，将SDA=1 I2C_SCL = 1; //时钟总线拉高 I2C_WaitMoment(); I2C_SDA = 1; //SCL=1时，将SDA拉高即产生停止信号 I2C_WaitMoment(); I2C_SCL = 0; //将SCL=0，完成启动信号操作 I2C_WaitMoment(); }
// //函数功能：模拟IIC主机发送8位数据 //入口参数：data-待发送数据 //函数返回：返回ack应答信号 //备 注：IIC协议ack应答信号为低有效 unsigned char I2C_Write1bYTE(unsigned char data) { unsigned char i = 8; I2C_SDA_IO = 0; I2C_SCL_IO = 0; do { I2C_SCL = 0; if(data&0x80) I2C_SDA = 1; else I2C_SDA = 0; I2C_SCL = 1; //时钟线做一个上升沿，将一位数据写入 data <<= 1; } while(--i); I2C_SCL = 0; I2C_SDA_IO = 1; //置为输入口接收应答信号
I2C_WaitMoment(); I2C_SCL = 1; //做个上升沿准备读应答信号 I2C_WaitMoment(); i = I2C_SDA; I2C_SCL = 0; I2C_SDA_IO = 0; return i; }
//函数功能：模拟IIC主机接收8位数据 //入口参数：ack-应答信号 //函数返回：接收到的数据 //备 注：IIC协议ack应答信号为低有效 unsigned char I2C_Read1bYTE(unsigned char ack) { unsigned char i,data; I2C_SDA_IO = 1; I2C_SCL_IO = 1; I2C_WaitMoment(); while(!I2C_SCL); //等待从机准备好数据释放时钟 I2C_SCL_IO = 0; I2C_SCL = 0; I2C_WaitMoment(); data <<= 1; if(I2C_SDA) data |= 0x1; for(i = 0; i < 7; i++) { I2C_SCL = 1; data <<= 1; if(I2C_SDA) data |= 0x1; I2C_SCL = 0; } I2C_SDA_IO = 0; if(ack)I2C_SDA = 1; //是否需要更多的数据 else I2C_SDA = 0; I2C_WaitMoment(); I2C_SCL = 1; I2C_WaitMoment(); I2C_SCL = 0; return data; }
void I2C_WaitMoment() { asm("nop"); asm("nop"); }
*/
