dear friends i have a peculiar situation at hand . i am trying to dump some message to my serial port and see it through my dummy terminal . before that i tried a simple LED toggling , it worked fine . for that the code i had written is : #pragma small #include #include
int main() { TMOD = 0x20; // The timer set to 8 bit auto reload timer TH1 = 0xFD; // Higher byte of timer1 set to FD or reload value set to FD TL1 = 0xFD; // Lower byte of timer1 set to FD SCON = 0x52; // The serial Controller is configured TR1=1; // Timer 1 run flag set
while(1) { printf("Hello World \n"); // data sent to serial port for displaying
}
return 1 ; }
so the problem is that on my hyperterminal i dont get anything . but in debug window ,in the serial watch window , i am able to see the output . but after burning the code into the chip and subsequently in the hyperterminal i am not able to . i am not able to follow where lies the problem . in the c51 primer exact code has been given , but that too does not work . i would like to add that : my oscillator frequency :11.059 mhz ; my baud rate (of hyperterminal also): 9600 bps ; software:evaluation version of KEIL H/W :ATMEL AT89C51 The code size is well below the 4K ram size of 89c51 .
an interesting thing is that , with the same hardware i am able to get on my hyperterminal output when i use assembly code(given below). just try if you can solve my problem . is there any setting on the simulator /complier / Hex file that i am missing out ???
code:
cseg at 0000H org 0000h ajmp start
org 0040H
start: mov sp,#40H mov r0,#07Fh back: mov @r0,#00 djnz r0,back mov th1,#0FDh ;configure serial port as 9600/8bit/No mov tmod,#00100000b setb tr1 mov scon,#52h ;
repeat1: mov a,#'@' call _xmit_byte jmp repeat1
;---------------------------------------------------------------- _XMIT_BYTE: MOV SBUF,A ; JNB TI,$ ;wait till byte is transmitted CLR TI ; RET ;---------------------------------------------------------------- end
plz help .ASAP with regards Som