无法在端口B上连接18f4620的LCD

对于输出引脚，您应该处理LATB寄存器，而不是PORTB寄存器。大多数PORTB引脚可以作为模拟输入。将它们转换成数字模式是您的工作。不这样做，使用PULTB而不是LATB，将导致保证失败。



以下为原文

For output pins, you should address the LATB register, not the PORTB register.
Most of the PORTB pins can act as analog inputs. It is YOUR JOB to switch them to digital mode.
Not doing that, and using PORTB rather than LATB, will cause a guaranteed failure.

我使用ADCON1= 0B1111；将所有端口转换为数字，错误信息消失，但无法在LCD上看到任何内容。



以下为原文


I used ADCON1=0b1111; to convert all ports to digitals and the error message disappeared but Can't see anything on lcd

// LCD module connections
***it LCD_RS at RB2_bit;
***it LCD_EN at RB3_bit;
***it LCD_D4 at RB4_bit;
***it LCD_D5 at RB5_bit;
***it LCD_D6 at RB6_bit;
***it LCD_D7 at RB7_bit;

***it LCD_RS_Direction at TRISB2_bit;
***it LCD_EN_Direction at TRISB3_bit;
***it LCD_D4_Direction at TRISB4_bit;
***it LCD_D5_Direction at TRISB5_bit;
***it LCD_D6_Direction at TRISB6_bit;
***it LCD_D7_Direction at TRISB7_bit;
// End LCD module connections

void main( ) {
Lcd_Init( );


ADCON1=0b1111;

lcd_out(1,1," Test ");
}

你没有改变你的别针来使用LAT寄存器。直到你调用LCDGIN IT（）之后，你才改变PIN到数字，你似乎在设法确保它失败。



以下为原文

You didn't change your pins to use the LAT register.
You didn't change the pins to digital until AFTER you called Lcd_Init( );
You seem to be going out of your way to make sure it fails.

你确定你正确地把你的液晶显示屏的EN，RS和R/W插脚连接到PIC的正确插脚吗？EN到PORTB3，RS到PORTB2和R/W到地？



以下为原文

Are you sure you connected correctly your EN, RS and R/W pins of the LCD to the correct pins of the PIC as per your LCD declaration?
EN to PORTB3, RS to PORTB2 and R/W to ground?

当ADADADCON1＝0B0111时工作良好；谢谢



以下为原文

worked fine when add

ADCON1=0b0111;

Thanks