// PIC24F16KA102 Configuration Bit Settings // 'C' source line config statements // FBS #pragma config BWRP = OFF // Table Write Protect Boot (Boot segment may be written) #pragma config BSS = OFF // Boot segment Protect (No boot program Flash segment) // FGS #pragma config GWRP = OFF // General Segment Code Flash Write Protection bit (General segment may be written) #pragma config GCP = OFF // General Segment Code Flash Code Protection bit (No protection) // FOSCSEL #pragma config FNOSC = PRI // Oscillator Select (Primary oscillator (XT, HS, EC)) #pragma config IESO = OFF // Internal External Switch Over bit (Internal External Switchover mode disabled (Two-Speed Start-up disabled)) // FOSC #pragma config POSCMOD = HS // Primary Oscillator Configuration bits (HS oscillator mode selected) #pragma config OSCIOFNC = ON // CLKO Enable Configuration bit (CLKO output disabled; pin functions as port I/O) #pragma config POSCFREQ = HS // Primary Oscillator Frequency Range Configuration bits (Primary oscillator/external clock input frequency greater than 8 MHz) #pragma config SOSCSEL = SOSCHP // SOSC Power Selection Configuration bits (Secondary oscillator configured for high-power operation) #pragma config FCKSM = CSDCMD // Clock Switching and Monitor Selection (Both Clock Switching and Fail-safe Clock Monitor are disabled) // FWDT #pragma config WDTPS = PS32768 // Watchdog Timer Postscale Select bits (1:32,768) #pragma config FWPSA = PR128 // WDT Prescaler (WDT prescaler ratio of 1:128) #pragma config WINDIS = OFF // Windowed Watchdog Timer Disable bit (Standard WDT selected; windowed WDT disabled) #pragma config FWDTEN = OFF // Watchdog Timer Enable bit (WDT disabled (control is placed on the SWDTEN bit)) // FPOR #pragma config BOREN = BOR2 // Brown-out Reset Enable bits (Brown-out Reset enabled only while device is active and disabled in Sleep; SBOREN bit disabled) #pragma config PWRTEN = OFF // Power-up Timer Enable bit (PWRT disabled) #pragma config I2C1SEL = PRI // Alternate I2C1 Pin Mapping bit (Default location for SCL1/SDA1 pins) #pragma config BORV = V18 // Brown-out Reset Voltage bits (Brown-out Reset set to lowest voltage (1.8V)) #pragma config MCLRE = ON // MCLR Pin Enable bit (MCLR pin enabled; RA5 input pin disabled) // FICD #pragma config ICS = PGx1 // ICD Pin Placement Select bits (PGC1/PGD1 are used for programming and debugging the device) // FDS #pragma config DSWDTPS = DSWDTPSF // Deep Sleep Watchdog Timer Postscale Select bits (1:2,147,483,648 (25.7 Days)) #pragma config DSWDTOSC = LPRC // DSWDT Reference Clock Select bit (DSWDT uses LPRC as reference clock) #pragma config RTCOSC = SOSC // RTCC Reference Clock Select bit (RTCC uses SOSC as reference clock) #pragma config DSBOREN = OFF // Deep Sleep Zero-Power BOR Enable bit (Deep Sleep BOR disabled in Deep Sleep) #pragma config DSWDTEN = OFF // Deep Sleep Watchdog Timer Enable bit (DSWDT disabled) // #pragma config statements should precede project file includes. // Use project enums instead of #define for ON and OFF. #include #define CRYSTAL_FRQUENCY 10000000 /* 10MHz crystal */ #define FCY CRYSTAL_FRQUENCY/2UL /* Cycle frequency */ #include #include #define LCD_BUS LATB /* DATA BUS FOR LCD 8bits */ #define ENABLE_LCD LATBbits.LATB9 /* Enable pin of LCD */ #define RS_LCD LATBbits.LATB8 /* RS pin of LCD */ #define LCD_BUS_DIRECTION TRISB /* DATA bus tristate register */ #define ENABLE_DIRECTION TRISBbits.TRISB9 /* Enable pin tristate register*/ #define RS_DIRECTION TRISBbits.TRISB8 /* RS pin tristate register */ #define FirstLine 0x80 #define SecondLine 0xC0 /*--------------------------------------------------------------------------------------------*/ /*^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^*/ void WriteCmd_LCD(unsigned char Cmd); void Initilize_LCD(void) { /* making Pins as output */ ENABLE_DIRECTION = 0; RS_DIRECTION = 0; LCD_BUS_DIRECTION = 0; /* Writing zero to pins and port */ ENABLE_LCD = 0; RS_LCD = 0; LCD_BUS = 0; __delay_ms(10); /* ten miliseconds delay */ /* writing commonds for initialization of LCD */ WriteCmd_LCD(0x38); /* Functions Set as Given in Datasheet */ WriteCmd_LCD(0x0C); /* Display ON; Cursor OFF; Blink OFF */ WriteCmd_LCD(0x06); /* Display Shifting OFF */ WriteCmd_LCD(0x01); /* Clear Display */ } /*^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^*/ void ClearScreen_LCD(void) { WriteCmd_LCD(0x01); /* Clear Screen command */ __delay_ms(3); /* Delay for cursor to return home must be * atleast 3ms menstioned in datasheet */ } /*^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^*/ void Toggle_Enable_Pin_LCD(void) { /* toggling Enable PIN is must for data to be displayed on screen After every Command and data for more details see datasheet */ ENABLE_LCD = 1; __delay_us(200); ENABLE_LCD = 0; __delay_us(200); } /*^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^*/ void WriteCmd_LCD(unsigned char Cmd) { RS_LCD = 0; /* For command RS must be low (0) */ LCD_BUS &= 0xFF00; /* Masking from 16bit register */ LCD_BUS |= Cmd; /* write Command to data bus of LCD */ Toggle_Enable_Pin_LCD(); } /*^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^*/ void WriteData_LCD(unsigned char Data) { RS_LCD = 1; /* For data RS must be high (1) */ LCD_BUS &= 0xFF00; /* Masking from 16bit register */ LCD_BUS |= Data; /* write data to data bus of LCD */ Toggle_Enable_Pin_LCD(); } /*^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^*/ void WriteString_LCD(const char *String) { while(*String != NULL) { WriteData_LCD(*String++); /* Display data untill string ends */ } } /*^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^*/ unsigned char MoveCursorToPosition(unsigned char Address) { /* valid addresses are for line one 0x80 - 0x8F and line two are 0xC0 - 0xCF */ if ((Address >= 0x80 && Address <= 0x8F) || (Address >= 0xC0 && Address <= 0xCF)) { WriteCmd_LCD(Address); return 1; } else return 0; } /*^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^*/ unsigned char WriteLongAsFloatUptoFiveFigures(unsigned long Long32Bit) { unsigned char Character[] = "0123456789"; if (Long32Bit < 10) { WriteData_LCD(Character[Long32Bit]); return 0; } else if (Long32Bit > 9 && Long32Bit < 100) { WriteData_LCD(Character[Long32Bit/10]); WriteData_LCD(Character[Long32Bit%10]); return 0; } else if (Long32Bit > 99 && Long32Bit < 1000) { WriteData_LCD(Character[Long32Bit/100]); WriteData_LCD(Character[Long32Bit%100/10]); WriteData_LCD(Character[Long32Bit%100%10]); return 0; } else if (Long32Bit > 999 && Long32Bit < 10000) { WriteData_LCD(Character[Long32Bit/1000]); WriteData_LCD('.'); WriteData_LCD(Character[Long32Bit%1000/100]); WriteData_LCD(Character[Long32Bit%1000%100/10]); WriteData_LCD(Character[Long32Bit%1000%100%10]); return 1; } else if (Long32Bit > 9999 && Long32Bit < 100000) { WriteData_LCD(Character[Long32Bit/10000]); WriteData_LCD(Character[Long32Bit%10000/1000]); WriteData_LCD('.'); WriteData_LCD(Character[Long32Bit%10000%1000/100]); WriteData_LCD(Character[Long32Bit%10000%1000%100/10]); WriteData_LCD(Character[Long32Bit%10000%1000%100%10]); return 1; } else if (Long32Bit > 99999 && Long32Bit < 1000000) { WriteData_LCD(Character[Long32Bit/100000]); WriteData_LCD(Character[Long32Bit%100000/10000]); WriteData_LCD(Character[Long32Bit%100000%10000/1000]); WriteData_LCD('.'); WriteData_LCD(Character[Long32Bit%100000%10000%1000/100]); WriteData_LCD(Character[Long32Bit%100000%10000%1000%100/10]); WriteData_LCD(Character[Long32Bit%100000%10000%1000%100%10]); return 1; } else if (Long32Bit > 999999 && Long32Bit < 10000000) { WriteData_LCD(Character[Long32Bit/1000000]); WriteData_LCD('.'); WriteData_LCD(Character[Long32Bit%1000000/100000]); WriteData_LCD(Character[Long32Bit%1000000%100000/10000]); WriteData_LCD(Character[Long32Bit%1000000%100000%10000/1000]); return 2; } else { return 3; } } /*^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^*/ void ConfigModuleADC(void) { TRISAbits.TRISA0 = 1; /* ADC input PIN as */ AD1CON1bits.ADON = 0; AD1CON3bits.ADRC = 0; AD1CON3bits.SAMC = 0b1111; AD1CON3bits.ADCS = 0b0000000; AD1CON2bits.CSCNA = 0; AD1CON2bits.BUFS = 0; AD1CON2bits.SMPI = 0b00000; AD1CON2bits.BUFM = 0; AD1CON2bits.ALTS = 0; AD1CON1bits.ADSIDL = 0; AD1CON1bits.FORM = 0b00; AD1CON1bits.SSRC = 0b0000; AD1CON1bits.ASAM = 0; } /*^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^*/ void ChangeChannelADC(unsigned char CHANNEL) { AD1CON1bits.ADON = 0; /* ADC OFF */ __delay_us(100); AD1CHSbits.CH0SA = (CHANNEL & 0b00011111); /* Channel Changed */ __delay_us(100); AD1CON1bits.ADON = 1; /* ADC ON */ } /*^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^*/ unsigned int SamplingAndConversionADC(void) { AD1CON1bits.SAMP = 1; /* Start sampling input */ while(!AD1CON1bits.SAMP); AD1CON1bits.SAMP = 0; /* End sampling */ while(AD1CON1bits.SAMP); while(!AD1CON1bits.DONE); return ADC1BUF0; } void DisplayResistance(void) { const char Voltage[] = "Digital OhmMeter"; unsigned char Unit = 0; const float R3 = 10000, Vcc = 5.0; /* vo = (10k/(90k + 10k)) vcc */ unsigned int ADC_Value = 0; float VoltageOutput = 0.0; unsigned long ResistanceMeasured = 0; /* 32 bit wide data type */ ClearScreen_LCD(); WriteString_LCD(Voltage); MoveCursorToPosition(SecondLine); ADC_Value = SamplingAndConversionADC(); /* Sampling */ VoltageOutput = ((float)(ADC_Value))* 0.0048828; /* 0.0048828 = 5/1024 */ ResistanceMeasured = (unsigned long)((VoltageOutput * R3)/(Vcc - VoltageOutput)); //ResistanceMeasured *= 1000; /* miliOhms conversion */ Unit = WriteLongAsFloatUptoFiveFigures(ResistanceMeasured); /* Printing integer value on LCD */ if (Unit ==2) WriteString_LCD(" MOhm"); else if (Unit == 1) WriteString_LCD(" kOhm"); else if (!Unit) WriteString_LCD(" Ohm"); else WriteString_LCD("Too Large"); } /******************************************************************************/ /* * */ int main(void) { Initilize_LCD(); ConfigModuleADC(); /* Configure ADC module */ ChangeChannelADC(0); /* AN0 channel */ while(1) { DisplayResistance(); __delay_ms(100); /* 200m Second delay */ } return 0; }