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想用8255实现LCD1602的显示，但是显示不了。求助大家！

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发布时间: 2020-6-14 18:36

正文摘要:

对1602的设置如下： #include <REG51.h> #include <ABSACC.h> #define uchar unsigned char #define uint unsigned int #define F8255S XBYTE[0xdfff] #define PA XBYTE[0xdffc] #define PB XBYTE[ ...

ID:155507 发表于 2020-9-29 20:34

我给你来个试试

#include < reg51.h >
char xdata PORTA _at_ 0x4000; //by making PORTA with address 4000H we are selecting Port A of the 8255
// and the CS low (select the 8255)
char xdata PORTB _at_ 0x4001; //by making PORTB with address 4001H we are selecting Port B of the 8255
// and the CS low (select the 8255)
void send_command(unsigned char i);
void send_data(unsigned char i);
void delay();
void main(void)
{
unsigned int i=0;
unsigned char line_1[] = "51HEI Hello ";
unsigned char line_2[] = "MICROCONTROLLER";
send_command(0x38); // Initialize LCD in 16x2 matrix mode
send_command(0x0E); // Display ON and cursor ON
send_command(0x01); // Clear the LCD
send_command(0x83); // Select first line and position of the cursor to 83H + position
// Display the dat on LCD's first line
for (i = 0; i < 11; i++)
{
send_data(line_1[i]);
}
send_command(0xC0); // Select the second line
// Display the dat on LCD's second line
for (i = 0; i < 16; i++)
{
send_data(line_2[i]);
}
while(1); //Loop forever to display the dat until the power is switched OFF
}
//Function to send command
void send_command(unsigned char i)
{
PORTA = i; //put data into 4000H
// Port B is connected to the command pins i.e. RS, R/W, and E
PORTB = 0x04; //4001H = 04H (00000100B) implies E = 1, RW = 0 (Write to LCD), RS = 0 (Command to be wriiten)
delay();
PORTB = 0x00; //4001H = 00H (00000000B) implies E = 0 (High to low pulse), RW = 0 (Write to LCD), RS = 0 (Command to be wriiten)
delay();
return;
}
//Function to send dat
void send_data (unsigned char i)
{
PORTA = i; //put data into 4000H
// Port B is connected to the command pins i.e. RS, R/W, and E
PORTB = 0x05; // 4001H = 05H (00000101B) implies E = 1, RW = 0 (Write to LCD), RS = 1 (Data to be wriiten to LCD)
delay();
PORTB = 0x01; // 4001H = 01H (0000 0001B) implies E = 0 (High to low pulse), RW = 0 (Write to LCD), RS = 1 (Data to be wriiten to LCD)
delay();
return;
}
// Function to generate delay
void delay()
{
unsigned int i =0;
for (i = 0; i < 100; i++);
}