PIC18F4520 + ADC

PIC18F4520 + ADC
Çeşme:
https://www.teachmemicro.com/pic-adc/
  1. PIC18F4520
// PIC18F4520 Configuration Bit Settings // 'C' source line config statements // CONFIG1H #pragma config OSC = XT // Oscillator Selection bits (XT oscillator) #pragma config FCMEN = OFF // Fail-Safe Clock Monitor Enable bit (Fail-Safe Clock Monitor disabled) #pragma config IESO = OFF // Internal/External Oscillator Switchover bit (Oscillator Switchover mode disabled) // CONFIG2L #pragma config PWRT = OFF // Power-up Timer Enable bit (PWRT disabled) #pragma config BOREN = SBORDIS // Brown-out Reset Enable bits (Brown-out Reset enabled in hardware only (SBOREN is disabled)) #pragma config BORV = 3 // Brown Out Reset Voltage bits (Minimum setting) // CONFIG2H #pragma config WDT = ON // Watchdog Timer Enable bit (WDT enabled) #pragma config WDTPS = 32768 // Watchdog Timer Postscale Select bits (1:32768) // CONFIG3H #pragma config CCP2MX = PORTC // CCP2 MUX bit (CCP2 input/output is multiplexed with RC1) #pragma config PBADEN = ON // PORTB A/D Enable bit (PORTB<4:0> pins are configured as analog input channels on Reset) #pragma config LPT1OSC = OFF // Low-Power Timer1 Oscillator Enable bit (Timer1 configured for higher power operation) #pragma config MCLRE = ON // MCLR Pin Enable bit (MCLR pin enabled; RE3 input pin disabled) // CONFIG4L #pragma config STVREN = ON // Stack Full/Underflow Reset Enable bit (Stack full/underflow will cause Reset) #pragma config LVP = ON // Single-Supply ICSP Enable bit (Single-Supply ICSP enabled) #pragma config XINST = OFF // Extended Instruction Set Enable bit (Instruction set extension and Indexed Addressing mode disabled (Legacy mode)) // CONFIG5L #pragma config CP0 = OFF // Code Protection bit (Block 0 (000800-001FFFh) not code-protected) #pragma config CP1 = OFF // Code Protection bit (Block 1 (002000-003FFFh) not code-protected) #pragma config CP2 = OFF // Code Protection bit (Block 2 (004000-005FFFh) not code-protected) #pragma config CP3 = OFF // Code Protection bit (Block 3 (006000-007FFFh) not code-protected) // CONFIG5H #pragma config CPB = OFF // Boot Block Code Protection bit (Boot block (000000-0007FFh) not code-protected) #pragma config CPD = OFF // Data EEPROM Code Protection bit (Data EEPROM not code-protected) // CONFIG6L #pragma config WRT0 = OFF // Write Protection bit (Block 0 (000800-001FFFh) not write-protected) #pragma config WRT1 = OFF // Write Protection bit (Block 1 (002000-003FFFh) not write-protected) #pragma config WRT2 = OFF // Write Protection bit (Block 2 (004000-005FFFh) not write-protected) #pragma config WRT3 = OFF // Write Protection bit (Block 3 (006000-007FFFh) not write-protected) // CONFIG6H #pragma config WRTC = OFF // Configuration Register Write Protection bit (Configuration registers (300000-3000FFh) not write-protected) #pragma config WRTB = OFF // Boot Block Write Protection bit (Boot block (000000-0007FFh) not write-protected) #pragma config WRTD = OFF // Data EEPROM Write Protection bit (Data EEPROM not write-protected) // CONFIG7L #pragma config EBTR0 = OFF // Table Read Protection bit (Block 0 (000800-001FFFh) not protected from table reads executed in other blocks) #pragma config EBTR1 = OFF // Table Read Protection bit (Block 1 (002000-003FFFh) not protected from table reads executed in other blocks) #pragma config EBTR2 = OFF // Table Read Protection bit (Block 2 (004000-005FFFh) not protected from table reads executed in other blocks) #pragma config EBTR3 = OFF // Table Read Protection bit (Block 3 (006000-007FFFh) not protected from table reads executed in other blocks) // CONFIG7H #pragma config EBTRB = OFF // Boot Block Table Read Protection bit (Boot block (000000-0007FFh) not protected from table reads executed in other blocks) // #pragma config statements should precede project file includes. // Use project enums instead of #define for ON and OFF. #include <xc.h> #include <inttypes.h> #define _XTAL_FREQ 4000000 void ADC_init(uint8_t channel); unsigned int ADC_read(); long map(long x, long in_min, long in_max, long out_min, long out_max); void main() { TRISB = 0; int adcValue=0; ADC_init(0); while (1) { adcValue = ADC_read(); PORTB = map(adcValue, 0, 1023, 0, 255); __delay_ms(100); } } void ADC_init(uint8_t channel) { ADCON2bits.ADFM = 1; //results right justified ADCON2bits.ADCS0 = 0; //conversion speed = 4*Tosc ADCON2bits.ADCS1 = 0; ADCON2bits.ADCS2 = 1; ADCON0bits.CHS = channel; ADCON0bits.ADON = 1; //turn on ADC __delay_ms(1); //should be enough to cover acquisition time } unsigned int ADC_read(){ ADCON0bits.GO_DONE = 1; while(ADCON0bits.GO_DONE == 1); unsigned int adval = (ADRESH << 8) + ADRESL; return adval; } long map(long x, long in_min, long in_max, long out_min, long out_max) { return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min; }