Sending data serially to pc

[Ghulam Mustafa]

Hello, 
i am new to AVR. Currently working on Atmega16. I want to transmit data with maximum possible rate to PC serially. 
Getting help from avr book by mazidi, i have written the following code for my controller. 

Code:

.INCLUDE “M16DEF.INC” 
LDI R16, HIGH(RAMEND) 
OUT SPH,R16 
LDI R16, LOW(RAMEND) 
OUT SPL,R16 

LDI R16,(1<<TXEN) 
OUT UCSRB, R16 
LDI R16,(1<<UCSZ1)|(1<<UCSZ0)|(1<<URSEL) 
OUT UCSRC, R16 
LDI R16, 0x33 
OUT UBRRL,R16 

AGAIN: 
LDI R17,’Y’ 
CALL TRNSMT 
LDI R17,’E’ 
CALL TRNSMT 
LDI R17,’S’ 
CALL TRNSMT 
LDI R17,’ ‘ 
CALL TRNSMT 
RJMP AGAIN 

TRNSMT: 
SBIS UCSRA,UDRE 
RJMP TRNSMT 
OUT UDR,R17 
RET 

The fuse bits are set to high byte D9 low byte FF 
i am using 8 Mhz crystal with 22 capacitor. 

I have tried a lot but not receiving data on the hyperterminal, pls guide me. 
Also connecting the osciloscope probe on the txd pin pulses are seen there. 
Thanks

[Amrith]

Gulham,

Using osciloscope, check the data at tx pin of MAX232. If you find data at tx pin of MAX232, there might be some thing wrong in baudrate. Try lowering the baudrate.

[Ghulam Mustafa]

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[AJISH ALFRED]

 

have you did the loopback test with your serial port of pc? connect a db9 connector, short pin 2 and 3, type something and the same should be received in hyperterminal

[Author]

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