Problem detecting data no Serial Port

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originally posted by hoffpistolao@Dec 21 2005, 08:27 AM

hello,

i´ve built the folowing code:

while (1)

{

fprintf(fp, "%c", b_pack);

for (j = 0; j < 10000000; j++)

{

//testadado = (testadado | tembyte()); // tem dado http://forum.niosforum.com/work2/style_emoticons/<#emo_dir#>/smile.gif

if(iord_altera_avalon_uart_status(endserial) & 0x080)

{

printf("i got data");

testadado = 1;

getchar();

break;

}

}

}

where fp is a pointer to my uart1.

well, i´m testing this code with hyperterminal.

i can receive the b_pack byte there with no problems. but when i send one byte thru the hyperterminal, the code keeps running and it do not enter in the

if(iord_altera_avalon_uart_status(endserial) & 0x080)

condition.

if i send a lot of data, then sometimes it enters in the condition. but it do not work to the first data.

can someone help me?

and isn´t there another way to detect if there is data on the serial?

thanks!

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Hello,

maybe the problem here is that you are using high-level HAL functions with low-level macros (driver level) to access your UART. If you only use one of these methods, it should work. May be if you fclose() the UART before using the low-level macros could help.

We had a similar problem because we wanted to use the high-level HAL functions only, but then the getchar() function blocked until there was data received. So we decided to write our own UART driver with a non-blocking read() function.

I hope this helps!