urgent please checking my code???

[Ni yanfang]

hi I am to write about serial communication using mcu and gsm modem to send sms to mobile. but i face some problem. can anyone give suggestion? did i need to set sbuf ??? I am wirting AT command using c language.
while(1){
if (ir_out==0){
SBUF = "A";
waitTx();
SBUF = "T";
waitTx();


}

 

[jayanth.devarayanadurga]

If you are using

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Code C - [expand]
1
printf()

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then you don't need to set SBUF.

**broken link removed**