What is CSL function UART_write timeout units?

Robert Smith

The TMS320C55x Chip Support Library API Reference Guide states:

Function CSLBool UART_write(char *pBuf, Uint16 length, Uint32 timeout);

Arguments

pbuf             Pointer to a data buffer
Length        Length of the data buffer
timeout       Time out for data ready.
                                 If it is setup as 0, means there will be no time out count.
                                 The function will block forever if THRE bit is not set.

However it doesn't say in what units is timeout? Is it in sec, milliseconds, microseconds, etc?

Thanks

over 13 years ago

0 Bill Finger over 13 years ago

Genius 3735 points

It is the number of iterations of a busy loop. It is not calibrated to engineering units, and in fact the number of cycles in the loop will depend on your compiler settings. But, there is really no other practical way to implement it without setting up a timer.

0 Steve Tsang over 13 years ago in reply to Bill Finger

TI__Mastermind 23785 points

Bill is correct. It is the loop count waiting for one byte of data. As Bill said, there is no other way to do it. Setting it to 0 will wait for the byte to complete might be a better setting.

Regards.

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What is CSL function UART_write timeout units?