remove HAL device drivers (preprocessor options)

[Altera_Forum]

Hello, 

 Is there a list anywhere of the available preprocessor options?  I need it because I want to remove some HAL drivers but need some others... For example, I want to access directly the UART peripheral registers but I need the LCD HAL driver.  On the SW Handbook, there is only the way to remove the HAL driver for the CFI_FLASH controller which is explained : We have to specify the option -DALT_NO_CFI_FLASH in the preprocessor options.  Is there an option like this one which removes the UART HAL driver ? Is there another way to remove the UART HAL driver ?  Thank you for any help,  Jean LEE

[Altera_Forum]

One way to disable the UART driver is to add a file named 'altera_avalon_uart.h' to your system library project. This file should contain the following: 

 #define ALTERA_AVALON_UART_INSTANCE(name, device)   # define ALTERA_AVALON_UART_INIT(name, device)    This will stop the HAL installing it's driver, and allow you to provide your own instead. If you want to initialise your driver before main(), you can use these macros - as described in the Nios II Software Developers' Handbook.

[Altera_Forum]

Thank you, 

 I will try.

[Altera_Forum]

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

[Altera_Forum]

Hi, 

 I found my error :  I put the altera_avalon_uart.h and altera_avalon_uart.c in my project directory but they must be placed in the System Library Project..  Regards,  Jean