NY8B062D 九齐单片机之ADC（采样值不准的解决办法）

古城微笑少年丶 2023-01-08 04:27 198阅读 0赞

其实ADC的程序 官方已经给出了 如下 （ 写这篇文章的目的是 就是本人在使用的时候 发现采样的数值 每次在接收采样值 必须要清零 要不然到处漂 ） 下面一段时间官方的程序 我就在上面加了个pwm的测试功能  
另外 九齐官方并没有给出具体得出电压的公式 这个问题开始我是找了一会的说明书 真的没有 后面还是根据以前的经验算法得出来的数值 采样值 \* 基准电压/4096 当然2k的单片机肯定不能在程序中计算，直接在外面计算好，得出的一个值在写入程序中进行判断就好了

=========================================================================*/
    #include <ny8.h>
    #include "ny8_constant.h"
    unsigned int  R_AIN2_DATA=0;	
    unsigned char R_AIN2_DATA_LB=0;	
    
    unsigned int  R_AIN3_DATA=0;	
    unsigned char R_AIN3_DATA_LB=0;	
    		
    unsigned int  R_Quarter_VDD_DATA=0 ;	
    unsigned char R_Quarter_VDD_DATA_LB=0;	
    
    unsigned int  D_PWM2_DUTY=0X00;
    
    #define UPDATE_REG(x) __asm__("MOVR _" #x ",F")
    //unsigned int 
    #define C_PWM_LB_DUTY_00H 0x00 //0x00
    #define C_PWM_LB_DUTY_40H 0xA0 
    #define C_PWM_LB_DUTY_01H 0x01
    #define C_PWM_LB_DUTY_FFH 0x01
    
    
    void F_AIN2_Convert(char);
    void F_AIN3_Convert(char);
    
    void F_Quarter_VDD_Convert(char);
    void F_wait_eoc(void);
    void delay(int);
    
    void main(void)
    { 
      //----- Initial GPIO-----
       //1 IOSTA = C_PA0_Input; // Set PortA as input port
       //1 IOSTA = C_PA1_Input; // Set PortA as input port 
        IOSTA = C_PA2_Input ;					// Set PortA as input port
        IOSTA = C_PA3_Input ;					// Set PortA as input port 
        IOSTB = C_PB1_Output;
        
    
        PORTA = 0xFF;							// PortA Data Register = 0xFF
        
        PORTBbits.PB1 = 1;
        INTE  = 0x00;							// INTE = 0x00
    
     //----- Initial ADC----- 
    //1 ADMD = C_ADC_En | C_ADC_CH_Dis | C_ADC_PA0 ; // Enable ADC power, Disable global ADC input channel, Select PA0 pad as ADC input (SFR "ADMD")
     ADMD  = C_ADC_En | C_ADC_CH_Dis | C_ADC_PA2 | C_ADC_PA3 ;	// Enable ADC power, Disable global ADC input channel, Select PA0 pad as ADC input (SFR "ADMD")
     
     //----- ADC high reference voltage source select-----
     	ADVREFH = C_Vrefh_4V;					// ADC reference high voltage is supplied by internal 4V (Note: ADC clock freq. must be equal or less than 1MHz)
     	//ADVREFH = C_Vrefh_3V; // ADC reference high voltage is supplied by internal 3V (Note: ADC clock freq. must be equal or less than 500KHz)
     	//ADVREFH = C_Vrefh_2V; // ADC reference high voltage is supplied by internal 2V (Note: ADC clock freq. must be equal or less than 250KHz)
     
    //----- ADC clock frequency select---------------------------- 
    	//ADR = C_Ckl_Div1; // ADC clock=Fcpu/1, Clear ADIF, disable ADC interrupt 
    	//ADR = C_Ckl_Div2; // ADC clock=Fcpu/2, Clear ADIF, disable ADC interrupt 
    	ADR	  = C_Ckl_Div8;						// ADC clock=Fcpu/8, Clear ADIF, disable ADC interrupt 
    	//ADR = C_Ckl_Div16; // ADC clock=Fcpu/16, Clear ADIF, disable ADC interrupt 
     
    //----- ADC Sampling pulse width select------------- 
       ADCR  = C_Sample_1clk | C_12BIT;		    // Sample pulse width=1 adc clock, ADC select 12-bit conversion ( Note: ADC clock freq. must be equal or less than 500KHz)
      //ADCR = C_Sample_2clk | C_12BIT; // Sample pulse width=2 adc clock, ADC select 12-bit conversion ( Note: ADC clock freq. must be equal or less than 1MHz)
     	//ADCR = C_Sample_4clk | C_12BIT; // Sample pulse width=4 adc clock, ADC select 12-bit conversion ( Note: ADC clock freq. must be equal or less than 1.25MHz)
     	//ADCR = C_Sample_8clk | C_12BIT; // Sample pulse width=8 adc clock, ADC select 12-bit conversion ( Note: ADC clock freq. must be equal or less than 2MHz) 
     // Initial Timer 1/2 & PWM1/2 control register 
        TMRH  = C_TMR2_Data_b9 | C_TMR2_Data_b8 | C_PWM2_Duty_b9 | C_PWM2_Duty_b8;
        TMR2  = 0xFF;							// Move FFH to TMR2 LB register ( TMR2[9:0]=3FFH )
       // PWM2DUTY = C_PWM_LB_DUTY_FFH; // Move FFH to PWM2DUTY LB register ( PWM2DUTY[9:0]=3FFH )
    
        T2CR2	 = C_PS2_Dis | C_TMR2_ClkSrc_Inst;	                            // Prescaler 1:1 , Timer2 clock source is instruction clock
        T2CR1	 = C_PWM2_En | C_PWM2_Active_Hi | C_TMR2_Reload | C_TMR2_En;	// Enable PWM2 , Active_High , Non-Stop mode ,reloaded from TMR2[9:0] , enable Timer2
        TMRH = TMRH & 0XF3;
    //-------------------------------------------------- 
    //1 PACON = C_PA0_AIN0 | C_PA1_AIN1; // Set AIN0(PA0) as pure ADC input for reduce power consumption (SFR "PACON")
        PACON = C_PA2_AIN2 | C_PA3_AIN3;		// Set AIN0(PA0) as pure ADC input for reduce power consumption (SFR "PACON") 
    	ADMDbits.GCHS = 1;						// Enable global ADC channel (SFR "ADMD")
    	delay(50);								// Delay 0.56ms(Instruction clock=4MHz/2T) for waiting ADC stable 
        while(1)
        { 
            CLRWDT();							// Clear WatchDog
    		R_AIN2_DATA=R_AIN2_DATA_LB=R_Quarter_VDD_DATA=R_Quarter_VDD_DATA_LB=R_AIN3_DATA=R_AIN3_DATA_LB =0x00;            
            F_AIN2_Convert(8);					// execute AIN0 ADC converting 8 times
            R_AIN2_DATA <<= 4;					// R_AIN0_DATA shift left 4 bit
            R_AIN2_DATA_LB &= 0xF0;				// Only get Bit7~4
            R_AIN2_DATA += R_AIN2_DATA_LB;		// R_AIN0_DATA + R_AIN0_DATA_LB
            R_AIN2_DATA >>=3;					// R_AIN0_DATA divided 8
            
            F_AIN3_Convert(8);					// execute AIN0 ADC converting 8 times
            R_AIN3_DATA <<= 4;					// R_AIN0_DATA shift left 4 bit
            R_AIN3_DATA_LB &= 0xF0;				// Only get Bit7~4
            R_AIN3_DATA += R_AIN3_DATA_LB;		// R_AIN0_DATA + R_AIN0_DATA_LB
            R_AIN3_DATA >>=3;					// R_AIN0_DATA divided 8
                
            F_Quarter_VDD_Convert(8);			// execute 1/4VDD input channel ADC converting 8 times
            R_Quarter_VDD_DATA <<= 4;			// R_Quarter_VDD_DATA shift left 4 bit
            R_Quarter_VDD_DATA_LB &= 0xF0;		// Only get Bit7~4
            R_Quarter_VDD_DATA += R_Quarter_VDD_DATA_LB; R_Quarter_VDD_DATA + R_Quarter_VDD_DATA_LB
            R_Quarter_VDD_DATA >>=3;			// R_Quarter_VDD_DATA dividing 8
    
           TMRH = 0X04;
           PWM2DUTY = R_AIN2_DATA / 4;;
         
        }
    }
    
    //----- Sub-Routine ----- 
    void F_AIN2_Convert(char count)
    { 
      	char i;
      	//1ADMD = 0x90 | C_ADC_PA0; // Select AIN0(PA0) pad as ADC input
      	ADMD  = 0x90 | C_ADC_PA2;				// Select AIN0(PA0) pad as ADC input
      	for(i=1;i<=count;i++)
      	{      			 
      	 ADMDbits.START = 1;					// Start a ADC conversion session
      	 F_wait_eoc();							// Wait for ADC conversion complete
      	 R_AIN2_DATA_LB += ( 0x0F & ADR); 
      	 R_AIN2_DATA    += ADD; 
      	}
    }
    
    void F_AIN3_Convert(char count)
    { 
      	char i;
      	//ADMD = 0x90 | C_ADC_PA1; // Select AIN0(PA0) pad as ADC input
      	ADMD  = 0x90 | C_ADC_PA3;				// Select AIN0(PA0) pad as ADC input
      	for(i=1;i<=count;i++)
      	{      			 
      	 ADMDbits.START = 1;					// Start a ADC conversion session
      	 F_wait_eoc();							// Wait for ADC conversion complete
      	 R_AIN3_DATA_LB += ( 0x0F & ADR); 
      	 R_AIN3_DATA    += ADD; 
      	}
    }
    
    void F_Quarter_VDD_Convert(char count)
    { 
      	char i;
      	ADMD  = 0x90 | C_Quarter_VDD;			// Select internal 1/4VDD as ADC input
      	for(i=1;i<=count;i++)
      	{      			 
      	 ADMDbits.START = 1;					// Start a ADC conversion session
      	 F_wait_eoc();							// Wait for ADC conversion complete 
      	 R_Quarter_VDD_DATA_LB += ( 0x0F & ADR); 
      	 R_Quarter_VDD_DATA    += ADD; 
      	}
    }
    
    void F_wait_eoc(void)
    { 
       while(ADMDbits.EOC==0)
       ;
    }
    
    void delay(int count)
    { 
    	int i;
    	for(i=1;i<=count;i++)
    	;
    }