remove HAL device drivers (preprocessor options)

Hi,

I tried and I think that I didn't all understood because the IDE doesn't seem to take my replacement in account.

Well, a bit more explanation of what I am doing could be good :

- I have a working project using HAL libraries which prints data coming from the UART to the LCD

- I took the source of this project and try now to remove the UART HAL driver (for learning purpose) and replace it by my own HAL driver.

- I've done what monkeyboy said before : I created an altera_avalon_uart.h in my project with the two lines.

# ifndef __ALT_AVALON_UART_H__# define __ALT_AVALON_UART_H__

# define ALTERA_AVALON_UART_INSTANCE(name, device) NULL# define ALTERA_AVALON_UART_INIT(name, device) NULL

# endif //__ALT_AVALON_UART_H__

- I created an empty altera_avalon_uart.c too and included "altera_avalon_uart.h" in my main.c file.

After all of this, I thought that my project won't work anymore. But it stills compile well and runs on my NIOS II development kit Cyclone II.

I don't really understand why.

Can anybody explain me more in details the library substitution ?

Do I have to create an alt_main() procedure ( I thought that it was not necesary) ?

I already read the "Boot sequence an entry point" and "Paths to HAL library files" in the Nios II Software Developers' Handbook.

Thank you for any help,

Jean LEE