Non-blocking serial read-function?

[compu]

I have a small question about Nspire C:
Is there a non-blocking function to check if data is available for reading at the serial port?

[ExtendeD]

You will have to use direct I/O access. It's not different than doing it from a computer: http://hackspire.unsads.com/wiki/index.php/Memory-mapped_I/O_ports#90020000_-_Serial_UART

Here is a code snippet that was once used in Ndless, equivalent to puts():

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void ut_puts(const char *str) { volatile unsigned *line_status_reg = (unsigned*)0x90020014; volatile unsigned *xmit_holding_reg = (unsigned*)0x90020000; while(*str) { while(!(*line_status_reg & 0b100000)); // wait for empty xmit holding reg *xmit_holding_reg = *str++; } }

[compu]

Thank you!