Chào các bạn trong bài đăng này mình sẽ hướng dẫn các bạn cách giao tiếp với led 7 seg cụ thể là đếm từ 0 - 9 sử dụng PIC18F452.
Sơ đồ như hình bên dưới.
Đây là code chương trinh.
#include <stdio.h>
#include <stdlib.h>
#include <pic18f452.h>
#define _XTAL_FREQ 4000000
#include "xc.h"
// CONFIG1H
#pragma config OSC = XT // Oscillator Selection bits (XT oscillator)
#pragma config OSCS = OFF // Oscillator System Clock Switch Enable bit (Oscillator system clock switch option is disabled (main oscillator is source))
// CONFIG2L
#pragma config PWRT = OFF // Power-up Timer Enable bit (PWRT disabled)
#pragma config BOR = OFF // Brown-out Reset Enable bit (Brown-out Reset disabled)
#pragma config BORV = 20 // Brown-out Reset Voltage bits (VBOR set to 2.0V)
// CONFIG2H
#pragma config WDT = OFF // Watchdog Timer Enable bit (WDT disabled (control is placed on the SWDTEN bit))
#pragma config WDTPS = 128 // Watchdog Timer Postscale Select bits (1:128)
// CONFIG3H
#pragma config CCP2MUX = OFF // CCP2 Mux bit (CCP2 input/output is multiplexed with RB3)
// CONFIG4L
#pragma config STVR = OFF // Stack Full/Underflow Reset Enable bit (Stack Full/Underflow will not cause RESET)
#pragma config LVP = OFF // Low Voltage ICSP Enable bit (Low Voltage ICSP disabled)
// CONFIG5L
#pragma config CP0 = OFF // Code Protection bit (Block 0 (000200-001FFFh) 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 (000000-0001FFh) 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 (000200-001FFFh) 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 (000000-0001FFh) 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 (000200-001FFFh) 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 (000000-0001FFh) not protected from Table Reads executed in other blocks)
void main()
{
unsigned char Pattern, Cnt = 0;
unsigned char SEGMENT[] = {0xC0,0xf9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90};
//{0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F};
TRISC = 0; // PORTC are outputs
while(1) // Endless loop
{
//Pattern = SEGMENT[Cnt]; // Number to send to PORTC
//Pattern = ~Pattern; // Invert bit pattern
//PORTC = Pattern; // Send to PORTC
PORTC = SEGMENT[Cnt];
__delay_ms(100);
Cnt++;
if(Cnt == 10) Cnt = 0; // Cnt is between 0 and 9
__delay_ms(100); // 1 second delay
}
}
Sơ đồ như hình bên dưới.
Đây là code chương trinh.
#include <stdio.h>
#include <stdlib.h>
#include <pic18f452.h>
#define _XTAL_FREQ 4000000
#include "xc.h"
// CONFIG1H
#pragma config OSC = XT // Oscillator Selection bits (XT oscillator)
#pragma config OSCS = OFF // Oscillator System Clock Switch Enable bit (Oscillator system clock switch option is disabled (main oscillator is source))
// CONFIG2L
#pragma config PWRT = OFF // Power-up Timer Enable bit (PWRT disabled)
#pragma config BOR = OFF // Brown-out Reset Enable bit (Brown-out Reset disabled)
#pragma config BORV = 20 // Brown-out Reset Voltage bits (VBOR set to 2.0V)
// CONFIG2H
#pragma config WDT = OFF // Watchdog Timer Enable bit (WDT disabled (control is placed on the SWDTEN bit))
#pragma config WDTPS = 128 // Watchdog Timer Postscale Select bits (1:128)
// CONFIG3H
#pragma config CCP2MUX = OFF // CCP2 Mux bit (CCP2 input/output is multiplexed with RB3)
// CONFIG4L
#pragma config STVR = OFF // Stack Full/Underflow Reset Enable bit (Stack Full/Underflow will not cause RESET)
#pragma config LVP = OFF // Low Voltage ICSP Enable bit (Low Voltage ICSP disabled)
// CONFIG5L
#pragma config CP0 = OFF // Code Protection bit (Block 0 (000200-001FFFh) 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 (000000-0001FFh) 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 (000200-001FFFh) 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 (000000-0001FFh) 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 (000200-001FFFh) 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 (000000-0001FFh) not protected from Table Reads executed in other blocks)
void main()
{
unsigned char Pattern, Cnt = 0;
unsigned char SEGMENT[] = {0xC0,0xf9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90};
//{0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F};
TRISC = 0; // PORTC are outputs
while(1) // Endless loop
{
//Pattern = SEGMENT[Cnt]; // Number to send to PORTC
//Pattern = ~Pattern; // Invert bit pattern
//PORTC = Pattern; // Send to PORTC
PORTC = SEGMENT[Cnt];
__delay_ms(100);
Cnt++;
if(Cnt == 10) Cnt = 0; // Cnt is between 0 and 9
__delay_ms(100); // 1 second delay
}
}
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