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(原文件名:11.jpg)
基于C语言编写的源代码与上面的电路。该方案只发送通过RS-232端口(输出)数据,并没有收到任何数据。正在使用的通信格式8,1,9600
/* Name : Sample LCD Program for Serial/RS-232 Port */
/* Written By : Craig Peacock <cpeacock@senet.com.au> 1997 */
#include <dos.h>
#include <stdio.h>
#include <conio.h>
#define PORT1 0x3E8 /* Port Address Goes Here */
/* Defines Serial Ports Base Address */
/* COM1 0x3F8 */
/* COM2 0x2F8 */
/* COM3 0x3E8 */
/* COM4 0x2E8 */
void main(void)
{
int c;
int count;
char init[] = { 0x0F, 0x01, 0x38 };
/* 0x0F - Init Display */
/* 0x01 - Clear Display */
/* 0x38 - Dual Line / 8 Bits */
outportb(PORT1 + 1 , 0x0); /* Turn off interrupts - Port1 */
outportb(PORT1 + 3 , 0x80); /* SET DLAB ON */
outportb(PORT1 + 0 , 0x0C); /* Set Baud rate - Divisor Latch Low Byte */
/* 0x06 = 19,200 BPS */
/* 0x0C = 9,600 BPS */
/* 0x18 = 4,800 BPS */
/* 0x30 = 2,400 BPS */
outportb(PORT1 + 1 , 0x00); /* Set Baud rate - Divisor Latch High Byte */
outportb(PORT1 + 3 , 0x03); /* 8 Bits, No Parity, 1 Stop Bit */
outportb(PORT1 + 2 , 0xC7); /* FIFO Control Register */
outportb(PORT1 + 4 , 0x0B); /* Turn on DTR, RTS, and OUT2 */
outportb(PORT1 + 4 , (inportb(PORT1 + 4) | 0x01)); /* Register Select (DTR) */
/* 0 = Instruction Register */
for (count = 0; count < 3; count++)
{
outportb(PORT1, init[count]); /* Send Init Data Bytes */
delay(20); /* Larger Delay for INIT */
}
outportb(PORT1 + 4 , (inportb(PORT1 + 4) & 0xFE)); /* Register Select (DTR) */
/* 1 = Data Register */
printf("\nSample Serial LCD Program. Press ESC to quit \n");
do {
if (kbhit()){
c = getch();
outportb(PORT1, c);
printf("%c",c);
}
} while (c !=27);
} |
阿莫论坛20周年了!感谢大家的支持与爱护!!
一只鸟敢站在脆弱的枝条上歇脚,它依仗的不是枝条不会断,而是自己有翅膀,会飞。
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