hm2_uart_read

NAME

hm2_uart_read — read data from a Hostmot2 UART buffer

SYNTAX

int hm2_uart_read ( char *name, unsigned char *data)

DESCRIPTION

hm2_uart_read read data from the UART "name". "name" is a unique string given to each UART during hostmot2 setup.
The names of the available channels are printed to standard output during the driver loading process and take the form:
hm2_<board name>.<board index>.uart.<index>
For example
hm2_5i23.0.uart.0

This function reads a variable number of bytes from the the specified channel.
It should be used inside a realtime HAL component registered with the main hostmot2 driver using the function hm2_uart_set_read_function in the setup code.

Note that the UART Receieve FIFO is only 16 bytes deep,(the transmit FIFO is 64 bytes) and "data" needs to be at least that large or undefined mayhem will ensue.

RETURN VALUE

Returns the number of bytes read on success and -1 on failure.

LICENCE

Issued under the terms of the GPL v2 License or any later version

AUTHOR

Andy Pugh

Machinekit