PIC16F15323单片机 （ADC+温度传感器）--汇编+C语言

1 基本原理

1.1 AD原理

见前面的文章

1.2 温度储传感器原理

1.3 FVR原理

2 实现代码

/*---------------------------------函数功能：-------------------------------------

 采集MCU的温度，并且用RC0口（LED）来判断是否采集完成，如果温度采集AD完成，则

 * AD对应的标志位ADIF=1，如果使能有效，则会产生一个中断，此时LED灯亮。

 编程思路：参考手册的P131  To do an A/D Conversion, follow these steps

----------------------------------------------------------------------------*/

// PIC16F15323 Configuration Bit Settings

// 'C' source line config statements

// CONFIG1

#pragma config FEXTOSC = ECH    // External Oscillator mode selection bits (EC above 8MHz; PFM set to high power)

#pragma config RSTOSC = EXT1X   // Power-up default value for COSC bits (EXTOSC operating per FEXTOSC bits)

#pragma config CLKOUTEN = OFF   // Clock Out Enable bit (CLKOUT function is disabled; i/o or oscillator function on OSC2)

#pragma config CSWEN = ON       // Clock Switch Enable bit (Writing to NOSC and NDIV is allowed)

#pragma config FCMEN = ON       // Fail-Safe Clock Monitor Enable bit (FSCM timer enabled)

// CONFIG2

#pragma config MCLRE = ON       // Master Clear Enable bit (MCLR pin is Master Clear function)

#pragma config PWRTE = OFF      // Power-up Timer Enable bit (PWRT disabled)

#pragma config LPBOREN = OFF    // Low-Power BOR enable bit (ULPBOR disabled)

#pragma config BOREN = ON       // Brown-out reset enable bits (Brown-out Reset Enabled, SBOREN bit is ignored)

#pragma config BORV = LO        // Brown-out Reset Voltage Selection (Brown-out Reset Voltage (VBOR) set to 1.9V on LF, and 2.45V on F Devices)

#pragma config ZCD = OFF        // Zero-cross detect disable (Zero-cross detect circuit is disabled at POR.)

#pragma config PPS1WAY = ON     // Peripheral Pin Select one-way control (The PPSLOCK bit can be cleared and set only once in software)

#pragma config STVREN = ON      // Stack Overflow/Underflow Reset Enable bit (Stack Overflow or Underflow will cause a reset)

// CONFIG3

#pragma config WDTCPS = WDTCPS_31// WDT Period Select bits (Divider ratio 1:65536; software control of WDTPS)

#pragma config WDTE = ON        // WDT operating mode (WDT enabled regardless of sleep; SWDTEN ignored)

#pragma config WDTCWS = WDTCWS_7// WDT Window Select bits (window always open (100%); software control; keyed access not required)

#pragma config WDTCCS = SC      // WDT input clock selector (Software Control)

// CONFIG4

#pragma config BBSIZE = BB512   // Boot Block Size Selection bits (512 words boot block size)

#pragma config BBEN = OFF       // Boot Block Enable bit (Boot Block disabled)

#pragma config SAFEN = OFF      // SAF Enable bit (SAF disabled)

#pragma config WRTAPP = OFF     // Application Block Write Protection bit (Application Block not write protected)

#pragma config WRTB = OFF       // Boot Block Write Protection bit (Boot Block not write protected)

#pragma config WRTC = OFF       // Configuration Register Write Protection bit (Configuration Register not write protected)

#pragma config WRTSAF = OFF     // Storage Area Flash Write Protection bit (SAF not write protected)

#pragma config LVP = ON         // Low Voltage Programming Enable bit (Low Voltage programming enabled. MCLR/Vpp pin function is MCLR.)

// CONFIG5

#pragma config CP = OFF         // UserNVM Program memory code protection bit (UserNVM code protection disabled)

// #pragma config statements should precede project file includes.

// Use project enums instead of #define for ON and OFF.

#include // 调用PIC16f15323单片机的头文件

//#include"delay.h"//调用延时子函数的头文件

/*-----------宏定义--------------*/

#define  uint  unsigned int

#define  uchar unsigned char

uint  ADbuf=0; // 缓存AD转换结果

/*-----------子函数声明--------------*/

/*-----------主函数--------------*/

void main()

{

    //-------------------1、Configure Port:---------------------//

// The corresponding data direction register is TRISA. 

// Setting  a TRISA bit (= 1) will make the corresponding PORTA pi an input. 

// Clearing a TRISA bit (= 0) will make the corresponding PORTA pin an output.

// 解释为什么需要TRISA0=1？ After the A/D module has been configured as desired, 

// the selected channel must be acquired before the conversion is started. 

// The analog input channels must have their corresponding TRIS bits selected as inputs. 

TRISA0=1; // RA0口为输入口，电压输入口

    TRISC0=0; // AD响应中断对应的LED灯的数据方向为输出

// 1 = Port pin is > VIH，即高电平  ;  0 = Port pin is < VIL，即低电平

RA0=0; // 要不要这行语句没有影响，因为该端口是输入端口

RC0=0; // LED灯的初值为灭

    //The ANSELA register (Register 14-4) is used to configure the Input mode of an I/O pin to analog.

    // Setting the appropriate ANSE     如果ANSEL=1，IO口为模拟输入，如果ANSEL=0，数字IO口。

    ANSA0=1;                    // Set RA0 to analog  ANSELA0,为什么见头文件

while(1) // 死循环，单片机初始化后，就一直运行这个死循环

{

        //-------------------2、Configure the ADC module:---------------------//

        //（1）寄存器ADCON1: ADFM ADCS<2:0> - - ADPREF<1:0>

        // 10-BIT ADC CONVERSION RESULT FORMAT 

        ADFM=1; //  AD Result Format Select bit.  0 = Left justified.  1 = Right justified

        //The source of the conversion clock is software selectable via the ADCS<2:0> bits 

        ADCS2=0;ADCS1=0;ADCS0=0; // Select ADC conversion clock    FOSC/2

         // The ADPREF<1:0> bits of the ADCON1 register provides control of the positive voltage reference

        ADPREF1=0;ADPREF0=0;            // Select voltage reference  00 =VREF+ is connected to VDD

        //（2）寄存器ADCON0:  CHS<5:0> GO/DONE ADON

        //The CHS<5:0> bits of the ADCON0 register determine which channel is connected to the sample and hold circuit.

        //CHS5=0;CHS4=0;CHS3=0;CHS2=0;CHS1=0;CHS0=0;   //   Select ADC input channel   选择RA0(AN0)作为模拟输入

        CHS5=1;CHS4=1;CHS3=1;CHS2=1;CHS1=0;CHS0=0;   //   Select ADC input channel  Temperature sensor  选择温度传感器作为模拟输入

        //ADC Conversion Status bit. 1 = ADC conversion cycle in progress. Setting this bit starts an ADC conversion cycle.

        // This bit is automatically cleared by hardware when the ADC conversion has completed.

        // 0 = ADC conversion completed/not in progress

        GOnDONE=0; // AD Conversion Status bit。为什么叫用GO_DONE看一下xc.h头文件

        //To enable the ADC module, the ADON bit of the ADCON0 register must be set to a ‘1’. 

        ADON=1; //Turn on ADC module    模数转换器使能位。 1 = A/D converter module is powered up  

        //----------新增部分：温度传感器寄存器配置( CHS5=1;CHS4=1;CHS3=1;CHS2=1;CHS1=0;CHS0=0;)---------------//

        //  FVREN: Fixed Voltage Reference Enable bit.  1 = Fixed Voltage Reference is enabled

        FVREN=1;

        // FVRRDY: Fixed Voltage Reference Ready Flag bit(1).   1 = Fixed Voltage Reference output is ready for use

        FVRRDY=1;

        // Temperature Indicator Enable bit.   1 = T emperature Indicator is enabled

        TSEN=1;

        // T emperature Indicator Range Selection bit.   1 = T emperature in High Range VOUT = 3VT ; 0 = T emperature in Low Range VOUT = 2VT

        TSRNG=0;                //Min. VDD, TSRNG = 0  (Low Range)  >= 1.8

        //  ADFVR<1:0>: ADC FVR Buffer Gain Selection bit  00 = ADC FVR Buffer is off

        // ADFVR1=0;ADFVR0=1;   //01 = ADC FVR Buffer Gain is 1x, (1.024V)

        ADFVR1=0;ADFVR0=0;      //00 = ADC FVR Buffer is off

//--------------------3、Configure ADC interrupt (optional):---------------------//

//ADIE=0; //禁止AD中断

//AD中断使能

ADIE=1;

ADIF=0; // Clear ADIF bit 

        INTEDG=1;               // Interrupt Edge Select bit   1 = Interrupt on rising edge of INT pin

PEIE=1; // 允许外设中断       

GIE=1; // 总中断允许

        //----------ADC BLOCK DIAGRAM框图有下面两个寄存器，但是AD采集程序没有用到？--------------//

        // AUTO CONVERSION TRIGGER    

        // TRIGSEL<3:0>;