Experiment Name: 1602 Display Infrared Value Experiment
IO Used: Motor on P1 port, keyboard uses P3.0, P3.1, P3.2, P3.3
Main Program
#include
#include “lcd.h”
sbit IRIN = P3^2;
unsigned char code CDIS1[13] = {” Red Control “};
unsigned char code CDIS2[13] = {” IR-CODE:–H “};
unsigned char IrValue[6];
unsigned char Time;
void IrInit();
void DelayMs(unsigned int);
void main()
{
unsigned char i;
IrInit();
LcdInit();
LcdWriteCom(0x80);
for(i = 0; i
{
LcdWriteData(CDIS1);
}
LcdWriteCom(0x80 + 0x40);
for(i = 0; i
{
LcdWriteData(CDIS2);
}
while(1)
{
IrValue[4] = IrValue[2] >> 4; // High byte
IrValue[5] = IrValue[2] & 0x0f; // Low byte
if(IrValue[4] > 9)
{
LcdWriteCom(0xc0 + 0x09); // Set display position
LcdWriteData(0x37 + IrValue[4]); // Convert value to ASCII code for display
}
else
{
LcdWriteCom(0xc0 + 0x09);
LcdWriteData(IrValue[4] + 0x30); // Convert value to ASCII code for display
}
if(IrValue[5] > 9)
{
LcdWriteCom(0xc0 + 0x0a);
LcdWriteData(IrValue[5] + 0x37); // Convert value to ASCII code for display
}
else
{
LcdWriteCom(0xc0 + 0x0a);
LcdWriteData(IrValue[5] + 0x30); // Convert value to ASCII code for display
}
}
}
void DelayMs(unsigned int x) // 0.14ms error 0us
{
unsigned char i;
while(x–)
{
for (i = 0; i
{}
}
}
void IrInit()
{
IT0 = 1; // Trigger on falling edge
EX0 = 1; // Enable interrupt 0
EA = 1; // Enable global interrupt
IRIN = 1; // Initialize port
}
void ReadIr() interrupt 0
{
unsigned char j, k;
unsigned int err;
Time = 0;
DelayMs(70);
if(IRIN == 0) // Confirm if the correct signal is received
{
err = 1000; // 1000 * 10us = 10ms, exceeding indicates an incorrect signal
/* Loop while both conditions are true; if one is false, exit to avoid program errors */
while((IRIN == 0) && (err > 0)) // Wait for the previous 9ms low level to pass
{
DelayMs(1);
err–;
}
if(IRIN == 1) // If the correct 9ms low level is detected
{
err = 500;
while((IRIN == 1) && (err > 0)) // Wait for the 4.5ms start high level to pass
{
DelayMs(1);
err–;
}
for(k = 0; k
{
for(j = 0; j
{
err = 60;
while((IRIN == 0) && (err > 0)) // Wait for the 560us low level to pass before the signal
//while (!IRIN)
{
DelayMs(1);
err–;
}
err = 500;
while((IRIN == 1) && (err > 0)) // Calculate the duration of the high level.
{
DelayMs(1); // 0.14ms
Time++;
err–;
if(Time > 30)
{
EX0 = 1;
return;
}
}
IrValue[k] >>= 1; // k indicates the group of data
if(Time >= 8) // If the high level appears for more than 565us, it is 1
{
IrValue[k] |= 0x80;
}
Time = 0; // Reset time after use
}
}
if(IrValue[2] != ~IrValue[3])
{
return;
}
}
}
#include “lcd.h”
Description: This function provides a delay for the microcontroller with a 12MHz crystal oscillator at a 12 frequency division.
#include “lcd.h”
void Lcd1602_Delay1ms(uint c) // Error 0us
{
uchar a, b;
for (; c > 0; c–)
{
for (b = 199; b > 0; b–)
{
for(a = 1; a > 0; a–);
}
}
}
#ifndef LCD1602_4PINS // When this LCD1602_4PINS is not defined
void LcdWriteCom(uchar com) // Write command
{
LCD1602_E = 0; // Enable
LCD1602_RS = 0; // Select command to send
LCD1602_RW = 0; // Select write
LCD1602_DATAPINS = com; // Put command
Lcd1602_Delay1ms(1); // Wait for data stability
LCD1602_E = 1; // Write timing
Lcd1602_Delay1ms(5); // Hold time
LCD1602_E = 0;
}
#else
void LcdWriteCom(uchar com) // Write command
{
LCD1602_E = 0; // Enable clear
LCD1602_RS = 0; // Select write command
LCD1602_RW = 0; // Select write
LCD1602_DATAPINS = com; // Since the 4-bit connection is connected to the high four bits of P0, there is no need to change for sending high four bits
Lcd1602_Delay1ms(1);
LCD1602_E = 1; // Write timing
Lcd1602_Delay1ms(5);
LCD1602_E = 0;
//Lcd1602_Delay1ms(1);
LCD1602_DATAPINS = com
Lcd1602_Delay1ms(1);
LCD1602_E = 1; // Write timing
Lcd1602_Delay1ms(5);
LCD1602_E = 0;
}
#endif
#ifndef LCD1602_4PINS
void LcdWriteData(uchar dat) // Write data
{
LCD1602_E = 0; // Enable clear
LCD1602_RS = 1; // Select input data
LCD1602_RW = 0; // Select write
LCD1602_DATAPINS = dat; // Write data
Lcd1602_Delay1ms(1);
LCD1602_E = 1; // Write timing
Lcd1602_Delay1ms(5); // Hold time
LCD1602_E = 0;
}
#else
void LcdWriteData(uchar dat) // Write data
{
LCD1602_E = 0; // Enable clear
LCD1602_RS = 1; // Select write data
LCD1602_RW = 0; // Select write
LCD1602_DATAPINS = dat; // Since the 4-bit connection is connected to the high four bits of P0, there is no need to change for sending high four bits
Lcd1602_Delay1ms(1);
LCD1602_E = 1; // Write timing
Lcd1602_Delay1ms(5);
LCD1602_E = 0;
LCD1602_DATAPINS = dat
Lcd1602_Delay1ms(1);
LCD1602_E = 1; // Write timing
Lcd1602_Delay1ms(5);
LCD1602_E = 0;
}
#endif
#ifndef LCD1602_4PINS
void LcdInit() // LCD initialization subroutine
{
LcdWriteCom(0x38); // Turn on display
LcdWriteCom(0x0c); // Turn on display without cursor
LcdWriteCom(0x06); // Increment pointer by 1
LcdWriteCom(0x01); // Clear screen
LcdWriteCom(0x80); // Set data pointer start
}
#else
void LcdInit() // LCD initialization subroutine
{
LcdWriteCom(0x32); // Convert 8-bit bus to 4-bit bus
LcdWriteCom(0x28); // Initialization under 4-bit line
LcdWriteCom(0x0c); // Turn on display without cursor
LcdWriteCom(0x06); // Increment pointer by 1
LcdWriteCom(0x01); // Clear screen
LcdWriteCom(0x80); // Set data pointer start
}
#endif
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