帮助初始化LCD 4位模式

你从不向TrISC写这些引脚输出。不要用“int”变量来计算字节，这对8位控制器来说是非常低效的。改为使用“无符号字符”。



      以下为原文

    You never write to TRISC to make those pins outputs.
Don't use "int" variables for bytes, that's horribly inefficient on an 8 bit controller. Use "unsigned char" instead.

嗨，我认为你的参数列表中的位序列很笨拙，参数列表中的第一个（最左边）的参数进入小写中的最低有效位。这与日立HD44 780数据表中的命令表和示例完全相反，您可以找到代码示例。在最左边的位置写数字中最重要的数字，然后在PIC16F630和类似的微控制器上，不可能读取输出锁存器，即没有LATC寄存器，当在同一端口R中更新位时，程序面临读取修改写入问题的风险。你可能需要使用一个影子寄存器来让它可靠地工作。更高的指令频率会使RMW问题变得更糟。第一个3字节写是一种已知的在8位模式下初始化显示的好方法。第4个半字节写将把显示带到4位模式。由于写之后，将一起2，形成一个8位字节。函数集操作应与低字节MysIL中的N和F参数重复。



      以下为原文

    Hi,
I think the Bit Sequence in your argument list is awkward, the first,(leftmost) argument in argument list,
goes into the Least significant bit in the nibble.
This is exactly opposite of command tables and examples in Hitachi HD44780 datasheet,
and code examples you may find.
In primary school, I was tought to write the most significant digit in a number, in the leftmost position.
 
Then on PIC16F630 and similar microcontrollers without possibility to Read the output Latchches, 
that is without  LATC register, the program is at risk of Read-Modify-Write problems,
when updating bits in the same Port register in close sequence.
You may need to use a Shadow register to get it to work reliably.
Higher instruction frequency will make RMW problems worse.
 
The first 3 nibble writes is a known good way to initialize the display in 8 bit mode.
The  4.th nibble writes will bring the display to 4 bit mode.
Following writes after that will go 2 together to form a 8 bit byte.
The Function set operation should repeated with N and F parameters in the low nibble
...
    write(1,1,0,0);    /* Reset to 8 bit mode */
    write(1,1,0,0);    /* reset to 8 bit mode */
    write(1,1,0,0);    /* --- " ---- */
    write(0,1,0,0);    /* Set 4 bit mode */
 
    write(0,1,0,0);    /* Function Set Command, Confirm 4 bit mode */
    write(0,0,0,1);    /* Low nibble of Function Set command, 2 line 5x8 font */
 
    write(0,0,0,0);    /* Display on/off control, High nibble is transferred first. */
    write(1,1,1,1);    /* Display On, Cursor On, Blink On. */
 
    write(0,0,0,0);    /* Entry mode set */
    write(0,1,1,0);    /* Increment  */
 
    RS = 1;
    write(D4,D5,D6,D7);    /* Character Write, High nibble first  */
    write(D0,D1,D2,D3);    /* Character Low nibble. */ 
 
   Mysil

如何使用MPLAB C30编译程序在4位模式下使用DSPL30F.AM制作16X1 LCD。请帮助我完成这个程序。



      以下为原文

    HOW CAN I MAKE 16X1 LCD IN 4 BIT MODE WITH DSPIC30F.
AM USING MPLAB C30 COMPILER.
PLEASE HELP ME FOR THE PROGRAM.