adcdac.c

基于MST-G240128点阵液晶的 状态机机制 人机界面四级滚屏菜单 源代码 ,带时间片机制模拟操作系统

/****************************************************************************
 **
 ** 文件名：  ADCDAC.c
 ** 功能：    C8051Fxxx的A/D、D/A驱动；
 ** 创建时间：2005.08.05

 ** 修改时间：2005.12.01
 ** 修改说明：

 ** 作者：    李立学
 ** 版权申明：可以拷贝，可以修改，但必须保留修改时间和作者信息
 ** 
 ****************************************************************************/


#include "LZK.H"

/****************************************************************************
** 函数名称: InVref_Init()
** 功能描述: C8051F040内部基准使能和初始化.
** 入口参数: Ref_EN：内部基准使能.
** 出口参数: 无
** 全局变量: 无
** 调用模块: 无
** 说明: 
****************************************************************************/
void InVref_Init(bit Ref_EN)
{
   SFRPAGE = LEGACY_PAGE;
   if( Ref_EN == 1 )  
     REF0CN = 0x07;	// 0000 0111: Enable  REF
   else  
     REF0CN = 0x00;	// 0000 0000: Disable REF
// REF0CN(00000000): Reference Control Register
// Bits7-5: UNUSED. Read = 000b; Write = don’t care.
// Bit4: AD0VRS: ADC0 Voltage Reference Select
//       0/1: ADC0 voltage reference from VREF0 / DAC0 output.
// Bit3: AD2VRS: ADC2 Voltage Reference Select
//       0/1: ADC2 voltage reference from VREF2 / AV+.
// Bit2: TEMPE: Temperature Sensor Enable Bit.
//       0/1: Internal Temperature Sensor Off / On.
// Bit1: BIASE: ADC/DAC Bias Generator Enable Bit.
//       0/1: Internal BiasGenerat or Off / ON.
// Bit0: REFBE: Internal Reference Buffer Enable Bit.
//       0/1: Internal Reference Buffer Off / On.
   SFRPAGE = 0x00;
}

/****************************************************************************
** 函数名称: ADC0_Init()
** 功能描述: 初始化CAN控制器定时、波特率，使能CAN控制器
** 入口参数: ADC0_EN:    0,ADC0 Disabled; 1,ADC0 Enabled; 
             ADC0_Mode:  0,AD0BUSY; 1,T3; 2,CNVSTR; 3,T2
             ADC0_ChNum: The Channal to ADC
             ADC0_GAIN:  GAIN of ADC0: 000,1; 001,2; 010,4; 011,8; 10x,16; 11x,0.5
             HVA_EN:     0/1, HVA Channal Disabled/Enabled.
             HVA_GAIN:   HVA GAIN, 00～11 <====> 0.5～14. 
             ADC0_LJST:  ADC0 DATA Format,Left/Right Justified.  
** 出口参数: 无
** 全局变量: 无
** 调用模块: 无
** 说明: 
****************************************************************************/
void ADC0_Init(bit ADC0_EN,unsigned char ADC0_Mode,unsigned char ADC0_ChNum,unsigned char ADC0_GAIN,bit HVA_EN,unsigned char HVA_GAIN,bit ADC0_LJST)
{
   unsigned char ucTMP;
	SFRPAGE = ADC0_PAGE;   // Switch to adc0 page
   AMX0CF = 0x00;        // All Channals are Single-Ended input  
//	AMUX0CF(00000000): AMUX0 Configuration Register
//	Bits7-4: UNUSED. Read = 0000b; Write = don’t care.
//	Bit3: PORT3IC: Port 3 even/odd Pin Input Pair Configuration Bit.
//	      0/1: Port 3 even and odd input channels are Single-Ended / Difference input pair
//	Bit2: HVDA2C: HVDA 2's Compliment Bit.
//	      0/1: HVDA output is single-ended / Result for 2’s compliment value
//	Bit1: AIN23IC: AIN0.2, AIN0.3 Input Pair Configuration Bit
//	      0/1: AIN0.2 and AIN0.3 are single-ended / difference input.
//	Bit0: AIN01IC: AIN0.0, AIN0.1 Input Pair Configuration Bit
//	      0/1: AIN0.0 and AIN0.1 are single-ended / difference input.
	AMX0SL = ADC0_ChNum;
//	AMX0SL(00000000): AMUX0 Channel Select Register
//	Bits7-4: UNUSED. Read = 0000b; Write = don’t care
//	Bits3-0: AMX0AD3-0: AMX0 Address Bits
    AMX0PRT = 0x00;
//  AMX0PRT(00000000): Port 3 Pin Selection Register
//    BitN: PAIN7EN: Pin N Analog Input Enable Bit (N = 7..0)
//          0/1: P3.N is Not Selected / Selected as an analog input to the AMUX.
    if( HVA_EN )
       ucTMP = 0x80;
	ucTMP = ucTMP | HVA_GAIN;
    HVA0CN = ucTMP; // 1000 0100: Av = 0.25
//	HVA0CN(00000000): High Voltage Difference Amplifier Control Register
//	Bit7: HVDAEN: High Voltage Difference Amplifier (HVDA) Enable Bit.
//	      0/1: The HVDA is Disabled Enabled.
//	Bits6-3: Reserved.
//	Bits2-0: HVGAIN3-HVGAIN0: HVDA Gain Control Bits.
//          Gain: 0.05～14.
	ADC0CF = 0x58 | ADC0_GAIN;	// 01011 000, Use the 2.0M SAR CLOCK ( <=100k SPS )
//  ADC0CF(00000000): ADC0 Configuration Register
//	Bits7-3: AD0SC4-0: ADC0 SAR Conversion Clock Period Bits
//           AD0SC[4..0] = (SYSCLK/ADC0_SAR_CLK)-1. SYSCLK: 24.000MHz
//  Bits2-0: AMP0GN2-0: ADC0 Internal Amplifier Gain (PGA)
//		     000  001  010  011  10x  11x
//     GAIN:  1    2    4    8   16   0.5  
    if( ADC0_EN == 1 )
      ADC0CN = 0xC0;              // ADC0 Enabled,Right-justified.
    else
	  ADC0CN = 0x40;              // ADC0 Disabled,Right-justified.
    if( ADC0_LJST == 1 )
      ADC0CN = ADC0CN | 0x01;     // ADC0 Left-justified.

    ucTMP = ADC0_Mode;
    ucTMP = (ucTMP << 2) & 0x0C;  // Only Bit[3..2](Periours Bit[1..0]) is Valid.  
	ADC0CN = ADC0CN | ucTMP;      // 1100 | ucTMP[4..0].
//	ADC0CN: ADC0 Control Register
//	Bit7: AD0EN: ADC0 Enable Bit.
//	      0/1: ADC0 Disabled / Enabled.
//	Bit6: AD0TM: ADC Track Mode Bit
//	      0/1: ADC Tracking is continuous / Tracking Defined by ADSTM1-0 bits.
//	Bit5: AD0INT: ADC0 Conversion Complete Interrupt Flag,and Cleared by software.
//	      0/1: ADC0 has not completed / completed a data conversion.
//	Bit4: AD0BUSY: ADC0 Busy Bit.
//	      Read: 0/1: ADC0 Conversion is complete / ADC0 Conversion is in progress.
//		  Write:0/1: No Effect / Initiates ADC0 Conversion if AD0STM1-0 = 00b.
//	Bit3-2: AD0CM1-0: ADC0 Start of Conversion Mode Select,
//	      If AD0TM = 0:
//		   	   00: ADC0 conversion initiated on every write of ‘1’ to AD0BUSY.
//			   01: ADC0 conversion initiated on overflow of Timer 3.
//			   10: ADC0 conversion initiated on rising edge of external CNVSTR.
//			   11: ADC0 conversion initiated on overflow of Timer 2.
//        If AD0TM = 1:
//		       00: Tracking starts with the write of ‘1’ to AD0BUSY.
//			   01: Tracking started by the overflow of Timer 3.
//			   10: ADC0 tracks only when CNVSTR '0'; Starts on rising CNVSTR edge.
//			   11: Tracking started by the overflow of Timer 2.
//	Bit1: AD0WINT: ADC0 Window Compare Interrupt Flag;and Cleared by software.
//        0/1: ADC0 Window Comparison Data match has Not Occurred / Occurred.
//	Bit0: AD0LJST: ADC0 Left Justify Select.
//	      0/1: Data in ADC0H:ADC0L registers are Right/Left-justified.

//  ADC0H/ADC0L:     ADC0 Data Word MSB/LSB Register.
//  ADC0GTH/ADC0GTL: ADC0 Greater-Than Data High/Low Byte Register.
//  ADC0LTH/ADC0LTL: ADC0 Less-Than Data High/Low Byte Register.
}

/****************************************************************************
** 函数名称: ADC0_CH_Setting()
** 功能描述: ADC0采样通道设置.
** 入口参数: ADC0_ChNum：要采样的通道.
** 出口参数: 无
** 全局变量: 无
** 调用模块: 无
** 说明: 
****************************************************************************/
void ADC0_CH_Setting(unsigned char ADC0_ChNum)
{
	SFRPAGE = ADC0_PAGE;         // Switch to ADC0 page.
	AMX0SL = ADC0_ChNum;         // The ChNum'th Channal to ADC
}

/****************************************************************************
** 函数名称: ADC0_Mode_Setting()
** 功能描述: ADC0采样模式设置.
** 入口参数: ADC0_Mode:  0,AD0BUSY; 1,T3; 2,CNVSTR; 3,T2.
** 出口参数: 无
** 全局变量: 无
** 调用模块: 无
** 说明: 
****************************************************************************/
void ADC0_Mode_Setting(unsigned char ADC0_Mode)
{
    unsigned char ucTMP;
	SFRPAGE = ADC0_PAGE;         // Switch to ADC0 page.
    ucTMP = ADC0_Mode;           // ADC0_Mode:  0,AD0BUSY; 1,T3; 2,CNVSTR; 3,T2
    ucTMP = (ucTMP << 2) & 0x0C; // Only Bit[3..2](Periours Bit[1..0]) is Valid.  
	ADC0CN = 0xC0 | ucTMP;       // 1100 | ucTMP[4..0].
}

/****************************************************************************
** 函数名称: ADC0_GAIN_Setting()
** 功能描述: ADC0输入PGA放大倍数设置.
** 入口参数: ADC0_GAIN：000,1; 001,2; 010,4; 011,8; 10x,16; 11x,0.5
** 出口参数: 无
** 全局变量: 无
** 调用模块: 无
** 说明: 
****************************************************************************/
void ADC0_GAIN_Setting(unsigned char ADC0_GAIN)
{
    unsigned char ucTMP;
	SFRPAGE = ADC0_PAGE;          // Switch to ADC0 page.
	ucTMP = ADC0CF & 0xf8;
	ADC0CF = ucTMP | ADC0_GAIN;   // .
}

/****************************************************************************
** 函数名称: ADC0_Cal()
** 功能描述: ADC0自校准，除去直流偏移.
** 入口参数: 无
** 出口参数: 无
** 全局变量: 无
** 调用模块: 无
** 说明: 
****************************************************************************/
unsigned char ADC0_Cal(void)     // ADC0 Offset Calibration.
{
   unsigned char i;
   unsigned int  uiTMP;
   ADC0_Mode_Setting(0x00);      // ADC0_Mode: 0,AD0BUSY.
   ADC0_CH_Setting(0x05);        // AMUX0 Connect with AGND.