Proteus 在 LCD 上顯示字符 (LM015L)

Question

我一直試圖在LCD ( LM015L )上顯示一些字符，但我無法做到。

我在c中編寫了以下代碼：

// LCD module connections
sbit LCD_RS at LATD0_bit;
sbit LCD_EN at LATD1_bit;
sbit LCD_D4 at LATD2_bit;
sbit LCD_D5 at LATD3_bit;
sbit LCD_D6 at LATD4_bit;
sbit LCD_D7 at LATD5_bit;

sbit LCD_RS_Direction at TRISD0_bit;
sbit LCD_EN_Direction at TRISD1_bit;
sbit LCD_D4_Direction at TRISD2_bit;
sbit LCD_D5_Direction at TRISD3_bit;
sbit LCD_D6_Direction at TRISD4_bit;
sbit LCD_D7_Direction at TRISD5_bit;
// End LCD module connections


void main() {

 Lcd_Init(); // Initialize LCD
 Lcd_Cmd(_LCD_CLEAR); // Clear display
 Lcd_Cmd(_LCD_CURSOR_OFF); // Cursor off

 Lcd_Out(1, 1, "microcontrollers"); // Display "StudentCompanion"
 Lcd_Out(2, 1, "lab.com"); // Display "Thermometer"

}

我在proteus中設計了以下方案

運行模擬后，液晶顯示屏打開，但沒有顯示任何內容

Answer 1

由於 PORTD 引腳與模擬硬件復用，您應該手動禁用模擬輸入。 這是您的代碼中缺少的內容。 請注意，每次 PIC 發生復位時，PORTS 的默認輸入功能是模擬輸入。

/ LCD module connections
sbit LCD_RS at LATD0_bit;
sbit LCD_EN at LATD1_bit;
sbit LCD_D4 at LATD2_bit;
sbit LCD_D5 at LATD3_bit;
sbit LCD_D6 at LATD4_bit;
sbit LCD_D7 at LATD5_bit;

sbit LCD_RS_Direction at TRISD0_bit;
sbit LCD_EN_Direction at TRISD1_bit;
sbit LCD_D4_Direction at TRISD2_bit;
sbit LCD_D5_Direction at TRISD3_bit;
sbit LCD_D6_Direction at TRISD4_bit;
sbit LCD_D7_Direction at TRISD5_bit;
// End LCD module connections


void main() {
 // The library only configures the direction of pins but not the analog functions. So you must do it before initializing the LCD module.
 ANSELD = 0; // Disable analog functions on PORTD

 Lcd_Init(); // Initialize LCD
 Lcd_Cmd(_LCD_CLEAR); // Clear display
 Lcd_Cmd(_LCD_CURSOR_OFF); // Cursor off

 Lcd_Out(1, 1, "microcontrollers"); // Display "StudentCompanion"
 Lcd_Out(2, 1, "lab.com"); // Display "Thermometer"

}