我的电路是这样的，内部RC，内部复位，UART0和UART1分别外接RSM3485，实现两个独立的RS485接口。
UART0－－RSM3485＿0－－P4＾6控制读写
UART1－－RSM3485＿1－－P4＾4控制读写
测试程序：
#include "REG952.h"
#include <INTRINS.H>
#define NOP10 {_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();}
sbit test =P0^0;
void dlylittle()
{
unsigned char i;
for(i=0;i<128;i++);
}
void main()
{
P0M1 =0x00;
P0M2 =0x00;
P4M1 =0x00;
P4M2 =0x00;
S1CON =0x50;
S1STAT =0x60;
BRGCON_1 =0X00;
BRG0_1 =0XF0;
BRG1_1 =0X02;
BRGCON_1 =0X03;
TEST =0;
P4 &=0xEF
dlylittle();
while(1)
{
test =~test;
S1BUF =0X55;
while(S1CON&0x02 == 0);
S1CON &=0xFD;
NOP10;
}
} |
|
楼主
