ＮＴＣサーミスタでPICのチップ表面温度を計測中

 

 

PIC 18F4553のチップ表面温度(室温で変わります)

Fosc 20MHｚで実行中のチップ表面温度：24.82℃

Fosc  5MHｚで実行中のチップ表面温度：22.78℃

 

ソースコード

 

キャラクタLCD表示i2c_aqm0802a.cやi2c.cは省略

 

main.c

 

#include <xc.h>
#include <p18f4553.h>
#include <stdio.h>
#include <math.h>

 

//Fosc = 20MHz

#pragma config CPUDIV = OSC2_PLL3 //[Primary Oscillator Src: /2][96 MHz PLL Src: /3]

//Fosc = 5MHz

//#pragma config CPUDIV = OSC2_PLL3 //[Primary Oscillator Src: /2][96 MHz PLL Src: /3]
#pragma config PLLDIV = 5 //Divide by 5 (20 MHz oscillator input)
#pragma config USBDIV = 2 //USB clock source comes from the 96 MHz PLL divided by 2
#pragma config FCMEN = OFF //Fail-Safe Clock Monitor disabled
#pragma config IESO = OFF //Oscillator Switchover mode disabled
#pragma config FOSC = HS //HS oscillator (HS)
#pragma config PWRT = OFF //PWRT disabled
#pragma config VREGEN = OFF //USB voltage regulator disabled
#pragma config BORV = 3 //Minimum setting
#pragma config BOR = ON //Brown-out Reset enabled in hardware only (SBOREN is disabled)
#pragma config WDTPS = 32768 //1:32768
#pragma config WDT = OFF //WDT disabled (control is placed on the SWDTEN bit)
#pragma config CCP2MX = OFF //CCP2 input/output is multiplexed with RB3
#pragma config PBADEN = OFF //PORTB<4:0> pins are configured as digital I/O on Reset
#pragma config MCLRE = ON //MCLR pin enabled; RE3 input pin disabled
#pragma config LPT1OSC = OFF //Timer1 configured for higher power operation
#pragma config STVREN = ON //Stack full/underflow will cause Reset
#pragma config DEBUG = OFF //Background debugger disabled, RB6 and RB7 configured as general purpose I/O pins
#pragma config ICPRT = OFF //ICPORT disabled
#pragma config LVP = OFF //Single-Supply ICSP disabled
#pragma config XINST = OFF //Instruction set extension and Indexed Addressing mode disabled (Legacy mode)
#pragma config CP0 = OFF //Block 0 (000800-001FFFh) is not code-protected
#pragma config CP1 = OFF //Block 1 (002000-003FFFh) is not code-protected
#pragma config CP2 = OFF //Block 2 (004000-005FFFh) is not code-protected
#pragma config CP3 = OFF //Block 3 (006000-007FFFh) is not code-protected
#pragma config CPB = OFF //Boot block (000000-0007FFh) is not code-protected
#pragma config CPD = OFF //Data EEPROM is not code-protected
#pragma config WRT0 = OFF //Block 0 (000800-001FFFh) is not write-protected
#pragma config WRT1 = OFF //Block 1 (002000-003FFFh) is not write-protected
#pragma config WRT2 = OFF //Block 2 (004000-005FFFh) is not write-protected
#pragma config WRT3 = OFF //Block 3 (006000-007FFFh) is not write-protected
#pragma config WRTB = OFF //Boot block (000000-0007FFh) is not write-protected
#pragma config WRTC = OFF //Configuration registers (300000-3000FFh) are not write-protected
#pragma config WRTD = OFF //Data EEPROM is not write-protected
#pragma config EBTR0 = OFF //Block 0 (000800-001FFFh) is not protected from table reads executed in other blocks
#pragma config EBTR1 = OFF //Block 1 (002000-003FFFh) is not protected from table reads executed in other blocks
#pragma config EBTR2 = OFF //Block 2 (004000-005FFFh) is not protected from table reads executed in other blocks
#pragma config EBTR3 = OFF //Block 3 (006000-007FFFh) is not protected from table reads executed in other blocks
#pragma config EBTRB = OFF //Boot block (000000-0007FFh) is not protected from table reads executed in other blocks

 

#define LED PORTEbits.RE2               //Sens Time

 

void i2c_init(void);
void i2c_enable(void);
void lcd_init(void);
void lcd_clear(void);
void lcd_write(unsigned char, unsigned char, const unsigned char*);

void MCP3425_Set_configuration(unsigned char);
void MCP3425_Get_data_configuration(unsigned char *);

 

//Fosc = 20MHz

#define _XTAL_FREQ 20000000             //__delay_ms

//Fosc = 5MHz

#define _XTAL_FREQ 5000000             //__delay_ms

 

void delay_us(int time){
    int i;
    for(i = 0; i < time; i++) __delay_us(1);
}

 

void delay_ms(int time){
    int i;
    for(i = 0; i < time; i++) __delay_ms(1);
}

 

void init(void){
    OSCCONbits.SCS = 0;                //Primary OSC
    ADCON1  = 0b00001111;             // All Digital
    CMCON   =   0b00000111;           // No Comparator
    TRISA   = 0b00000000;
    TRISB   = 0b00000000;
    TRISC   = 0b00000000;
    TRISD   = 0b00000000;
    TRISE   =   0b00000011;
    LATA    = 0b00000000;
    LATB    = 0b00000000;
    LATC    = 0b00000000;
    LATD    = 0b00000000;
    LATE    = 0b00000000;
}

 

void main(void){
    unsigned char get_value_byte[3];
    unsigned int get_value_int;
    float get_value_float, temp;
    float Tr;
    char string[10];

    init();

    i2c_init();
    i2c_enable();

    lcd_init();
    lcd_clear();

    lcd_write(0, 0, "Temp.   ");
    while(1){
        LED = 1;
        MCP3425_Set_configuration(0b10001011); //Continuous mode, 15SPS(16bit), Gain x8
        delay_ms(1);
        MCP3425_Get_data_configuration(get_value_byte);
        get_value_int = get_value_byte[0] << 8 | get_value_byte[1];
        get_value_float = (((float)get_value_int * 2.048) / 32768) / 8;
        Tr = (get_value_float * 560000.0) / (3.3 - get_value_float);
        temp = 1 / ( log(Tr / 10000.0) / 3380.0 + (1 / (25.0 + 273.15))) - 273.15;
        sprintf(string, "%5.2fc", temp);
        lcd_write(2, 1, string);
        LED = 0;
        delay_ms(100);
    } //while
} //main

 

i2c_mcp3425.c

 

#include <xc.h>
#include <p18f4553.h>

 

#define MCP3425_I2C_ADDR 0xD0
#define WRITE_MODE 0x00
#define READ_MODE 0x01

#define PROVE PORTCbits.RC0             //Prove

 

void delay_us(int);
void delay_ms(int);

 

void MCP3425_Set_configuration(unsigned char data);
void MCP3425_Get_data_configuration(unsigned char *get_value);

 

void MCP3425_Set_configuration(unsigned char byte){
 SSPCON2bits.SEN = 1;
 while(SSPCON2bits.SEN == 1);

 

 SSPBUF = MCP3425_I2C_ADDR | WRITE_MODE;
 while(SSPSTATbits.BF);
 delay_us(1);
 if (SSPCON2bits.ACKSTAT){
  SSPCON2bits.PEN = 1;
  while(SSPCON2bits.PEN);
  return;
 }

 

 SSPBUF = byte;
 while(SSPSTATbits.BF);
 delay_us(1);
 if (SSPCON2bits.ACKSTAT){
  SSPCON2bits.PEN = 1;
  while(SSPCON2bits.PEN);
  return;
 }

 

 delay_us(1);
 SSPCON2bits.PEN = 1;
 while(SSPCON2bits.PEN);
 return;
}

 

void MCP3425_Get_data_configuration(unsigned char *get_value)

 PROVE = 1; //波形観測用トリガ
 SSPCON2bits.SEN = 1;
 while(SSPCON2bits.SEN == 1);

 

 SSPBUF = MCP3425_I2C_ADDR | READ_MODE;
 while(SSPSTATbits.BF);
        delay_us(1);
 if (SSPCON2bits.ACKSTAT){
  SSPCON2bits.PEN = 1;
  while(SSPCON2bits.PEN);
  return;
 }

 

 delay_us(1);
 SSPCON2bits.RCEN = 1;
 while(SSPCON2bits.RCEN);
 while(SSPSTATbits.BF == 0);
 SSPCON2bits.ACKEN = 1;
 get_value[0] = SSPBUF;

 

 delay_us(1);
 SSPCON2bits.RCEN = 1;
 while(SSPCON2bits.RCEN);
 while(SSPSTATbits.BF == 0);
 SSPCON2bits.ACKEN = 1;
 get_value[1] = SSPBUF;

 

 delay_us(1);
 SSPCON2bits.RCEN = 1;
 while(SSPCON2bits.RCEN);
 while(SSPSTATbits.BF == 0);
 SSPCON2bits.ACKEN = 1;
 get_value[2] = SSPBUF;

 

 delay_us(1);
 SSPCON2bits.PEN = 1;
 while(SSPCON2bits.PEN);
 PROVE = 0;
 return;
}

 

 

 

(JF1VRR)