Posted on May 17, 2011 at 12:10My Uart2 initialize as following:
void Init_ComPort2()
{
EA=0;
T2MOD=0;
T2CON=0x30;
TH2 =0xff;TL2 =0xDC; //T2 9600b/s 11.0592MHz
RCAP2H=0xff;RCAP2L=0xDC; //T2 9600b/s 11.0592MHz
ET2=0; //disable T2 interrupt
TR2=0;
SCON2 =0x50;
PCON |=0x0c; //Used T2
IEA &=0xef; //Disable Uart2 interrupt
TR2=1;
EA=1; //CPU interrupt enabled
}
But,At main program ,when I use
IEA |=0x10; //ES2=1 Enable Uart2 interrupt
to Enable Uart2 interrupt, I find the all program run very slowly!
The interrupt program as:
void Com2Receive() interrupt 9 using 3
{
unsigned char ch;
if (SCON2& 0x01==0x01) //RI2=1
{
ch=SBUF2;
SCON2 &= 0xFE; //RI2 = 0;
IEA &= 0xef; //ES2=0
switch(ch){
case 0xDD:
...
break;
case 0xDE:
...
break;
default:
break;
}
IEA |=0x10; //ES2=1
}
}
And I find the interrupt program always run when I debug the main prigram.
When I use Uart0 ,everything is oK!!!
Why?
