ABSF WROTE:Most probably your 16F877A is saying bye-bye.
The message is saying that the programming stops at the first address of your PIC. Which means the first word is having problem going into your PIC.
Do you have any spare PIC to change? The target Vdd seems OK! Which LEDs are lighted?
Allen
I dont have spare PIC ...
Actually when I click read first and then click right program then it downloads successfully and during writing program the red,yellow and the LED1 and LED2 also blinked as I was just testing LED blinking code. Seem no problem in PIC yet.Can you kindly check the code below for blinking led with PIC877A.
// include
//==========================================================================
#include <pic.h>
//configuration
//==========================================================================
__CONFIG ( 0x3F32 ); //configuration for the microcontroller
// define
//==========================================================================
#define rs RB4 //RS pin of the LCD display
#define e RB5 //E pin of the LCD display
#define lcd_data PORTD //LCD 8-bit data PORT
#define SW1 RB0
#define SW2 RB1
#define LED1 RB6
#define LED2 RB7
// function prototype (every function must have a function prototype)
//==========================================================================
void delay(unsigned long data);
void send_config(unsigned char data);
void send_char(unsigned char data);
void lcd_goto(unsigned char data);
void lcd_clr(void);
void send_string(const char *s);
void uart_send(unsigned char data);
// global variable
//==========================================================================
// main function (main fucntion of the program)
//==========================================================================
void main()
{
unsigned long delay_time=5000;
//set I/O input output
TRISB = 0b00000011; //configure PORTB I/O direction
TRISD = 0b00000000; //configure PORTD I/O direction
TRISA = 0b00000111; //configure PORTA I/O direction
//setup ADC
ADCON1 = 0b00000110; //set ADx pin digital I/O
//configure lcd
send_config(0b00000001); //clear display at lcd
send_config(0b00000010); //lcd return to home
send_config(0b00000110); //entry mode-cursor increase 1
send_config(0b00001100); //display on, cursor off and cursor blink off
send_config(0b00111000); //function set
//display startup message
lcd_clr(); //clear lcd
lcd_goto(2); //set the lcd cursor to location 0
send_string("Cytron Tech."); //display "Cytron Tech."
lcd_goto(26); //set the lcd cursor to location 20
send_string("SK40C"); //display "SK40C"
LED1=0; //OFF LED1
LED2=0; //OFF LED2
while(1) //Infinite loop
{
if(!SW1) //check if SW1 is pressed
{
while (!SW1); //wait SW1 pressed
{
delay_time+=1000; //delay
}
}
else if(!SW2) //check if SW2 is pressed
{
while (!SW2); //wait SW2 pressed
{
delay_time-=1000; //delay
}
}
LED1^ = 1; //toggle LED1
delay(delay_time);
LED2^ = 1; //toggle LED2
delay(delay_time);
}
}
// functions
//==========================================================================
void delay(unsigned long data) //delay function, the delay time
{ //depend on the given value
for( ;data>0;data--);
}
void send_config(unsigned char data) //send lcd configuration
{
rs=0; //set lcd to configuration mode
lcd_data=data; //lcd data port = data
e=1; //pulse e to confirm the data
delay(50);
e=0;
delay(50);
}
void send_char(unsigned char data) //send lcd character
{
rs=1; //set lcd to display mode
lcd_data=data; //lcd data port = data
e=1; //pulse e to confirm the data
delay(10);
e=0;
delay(10);
}
void lcd_goto(unsigned char data) //set the location of the lcd cursor
{ //if the given value is (0-15) the
if(data<16) //cursor will be at the upper line
{ //if the given value is (20-35) the
send_config(0x80+data); //cursor will be at the lower line
} //location of the lcd cursor(2X16):
else // -----------------------------------------------------
{ // | |00|01|02|03|04|05|06|07|08|09|10|11|12|13|14|15| |
data=data-20; // | |20|21|22|23|24|25|26|27|28|29|30|31|32|33|34|35| |
send_config(0xc0+data); // -----------------------------------------------------
}
}
void lcd_clr(void) //clear the lcd
{
send_config(0x01);
delay(600);
}
void send_string(const char *s) //send a string to display in the lcd
{
while (s && *s)send_char (*s++);
}
void uart_send(unsigned char data)
{
while(TXIF==0); //only send the new data after
TXREG=data; //the previous data finish sent
}
The above code is from your website with SK40C kit.
Thank you very much.
