sh79f166a驱动CS1237 24位AD程序.zip_CS1237汇编程序_SH79F166A_cs1237_cs123

/* PROJECT NAME: ELECTRONIC SCALE. */ /* CAMPANY : Chipsea technologies Co., LTD. */ /* LANGUAGE : C */ /* EDITOR : */ /* DATE : 2014.07.24 */ /*---------------------------------------------------------------------------- CODE NAME : AD_Communication.C - description - MCU与ADC通讯相关子程序 -----------------------------------------------------------------------------*/ //整个通讯时序的时间必须小于1个数据转换周期 //推荐每个CLK的时间长度：2uS ~ 15uS /*----------------------------------------------------------------------------- Name : F_AD_Clock Function: ADC时序时钟 -----------------------------------------------------------------------------*/ #include <SH79F166A.H> sbit IO_CLK_AD=P3^2; sbit IO_Data_AD=P3^3; unsigned long ADC_data=0; void F_Delay(void) { unsigned char i=0; i=20; while(i--); } void F_AD_Clock(void) { P3CR|=0x04; IO_CLK_AD = 1; F_Delay(); IO_CLK_AD = 0; F_Delay(); } /*----------------------------------------------------------------------------- Name : F_Read_AD_Byte Function: 读3字节AD值 -----------------------------------------------------------------------------*/ unsigned long F_Read_AD(void) { unsigned char i; ADC_data = 0; P3CR&=0xf7; //EIC20_EIE0 = 0; //关闭MCU_DAT管脚的外部中断(防止读写时误触发) while(IO_Data_AD); for(i = 0; i < 24; i++) //发送24个CLK，接收数据 { ADC_data <<= 1; F_AD_Clock(); if(IO_Data_AD) { ADC_data ++; } } F_AD_Clock(); F_AD_Clock(); F_AD_Clock(); //CLK27，拉高DRDY //如果一个数据转换周期内对ADC进行两次或以上的读写操作，则需要发送46个CLK，而不是27个CLK //(即：发送24个CLK读取数据，然后再发送22个CLK) //EIC20_EIE0 = 1; //重新开启MCU_DAT管脚的外部中断 return ADC_data; } /*----------------------------------------------------------------------------- Name : F_Rd_AdReg Function: 读取ADC寄存器 -----------------------------------------------------------------------------*/ unsigned char F_Rd_AdReg(void) { unsigned char i; unsigned char send_data=0; // union _UCHAR_BIT R_Temp; //---------------------------------- //EIC20_EIE0 = 0; //关闭MCU_DAT管脚的外部中断(防止读写时误触发) //---------------------------------- //1 ~ 3：clk1-clk27 //---------------------------------- for(i = 0; i < 27; i++) { F_AD_Clock(); } //---------------------------------- //4：clk28-clk29 //---------------------------------- P3CR|=0x08; //IO_Data_AD_Dir = 1; //把MCU_Data管脚设为输出 F_AD_Clock(); F_AD_Clock(); //---------------------------------- //5：clk30-clk36(发送读命令) //---------------------------------- send_data = 0xAC; //读命令(0x56)左移1位 for(i = 0; i < 7; i ++) { if(send_data&0x80) //MSB { IO_Data_AD = 1; } else { IO_Data_AD = 0; } send_data = send_data << 1; F_AD_Clock(); } //---------------------------------- //6：clk37 //---------------------------------- // IO_Data_AD_Dir = 0; //把MCU_Data管脚设为输入 P3CR&=0xf7; F_AD_Clock(); //---------------------------------- //7：clk38-clk45(读取寄存器) //---------------------------------- send_data = 0; for(i = 0; i < 8; i++) { send_data <<= 1; F_AD_Clock(); if(IO_Data_AD) { send_data ++; } } //---------------------------------- //8：clk46 //---------------------------------- F_AD_Clock(); //---------------------------------- //EIC20_EIE0 = 1; //重新开启MCU_DAT管脚的外部中断 return send_data; } /*----------------------------------------------------------------------------- Name : F_Wr_AdReg Function: 写入ADC寄存器 -----------------------------------------------------------------------------*/ void F_Wr_AdReg(unsigned char R_AdReg) { unsigned char i; unsigned char send_data1=0; //---------------------------------- //EIC20_EIE0 = 0; //关闭MCU_DAT管脚的外部中断(防止读写时误触发) //---------------------------------- //1 ~ 3：clk1-clk27 //---------------------------------- for(i = 0; i < 27; i++) { F_AD_Clock(); } //---------------------------------- //4：clk28-clk29 //---------------------------------- P3CR|=0x08; // IO_Data_AD_Dir = 1; //把MCU_Data管脚设为输出 F_AD_Clock(); F_AD_Clock(); //---------------------------------- //5：clk30-clk36(发送写命令) //---------------------------------- send_data1 = 0xCA; //写命令(0x65)左移1位 for(i = 0; i < 7; i ++) { if(send_data1&0x80) //MSB { IO_Data_AD = 1; } else { IO_Data_AD = 0; } send_data1 = send_data1 << 1; F_AD_Clock(); } //---------------------------------- //6：clk37 //---------------------------------- F_AD_Clock(); //---------------------------------- //7：clk38-clk45(写入寄存器) //---------------------------------- send_data1 = R_AdReg; for(i = 0; i < 8; i ++) { if(send_data1&0x80) //MSB { IO_Data_AD = 1; } else { IO_Data_AD = 0; } send_data1 = send_data1 << 1; F_AD_Clock(); } //---------------------------------- //8：clk46 //---------------------------------- //IO_Data_AD_Dir = 0; //把MCU_Data管脚设为输入 P3CR&=0xf7; F_AD_Clock(); //---------------------------------- //EIC20_EIE0 = 1; //重新开启MCU_DAT管脚的外部中断 }