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[avr-libc-dev] [bug #27201] _WORDREGISTER in xmega headers does not work

From: Soeren Schneider
Subject: [avr-libc-dev] [bug #27201] _WORDREGISTER in xmega headers does not work in C99 mode
Date: Fri, 07 Aug 2009 10:41:29 +0000
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv: Gecko/20090729 Firefox/3.5.2


                 Summary: _WORDREGISTER in xmega headers does not work in C99
                 Project: AVR C Runtime Library
            Submitted by: schneiso
            Submitted on: Fr 07 Aug 2009 10:41:28 GMT
                Category: Header
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Header files
                  Status: None
        Percent Complete: 0%
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 1.6.5
           Fixed Release: None



When using -std=c99 in conjunction with ATxmega128A1 the following example
code from the website for Xmega (Application node AVR1300: Using the XMEGA
ADC) does not compile for avr-gcc (Win-AVR20090313). 

ADC_CH_t *acd_ch;
int16_t answer;
answer = adc_ch->RES;

This creates the following error message:
"error: 'ADC_CH_t' has no member named 'RES'

When looking at the corresponding header file iox128a1.h the type ADC_CH_t is
defined as such:

typedef struct ADC_CH_struct
    register8_t CTRL;  /* Control Register */
    register8_t MUXCTRL;  /* MUX Control */
    register8_t INTCTRL;  /* Channel Interrupt Control */
    register8_t INTFLAGS;  /* Interrupt Flags */
    _WORDREGISTER(RES);  /* Channel Result */
    register8_t reserved_0x6;
    register8_t reserved_0x7;
} ADC_CH_t;

The issue is caused be the definition of "_WORDREGISTER" in line 94:

#define _WORDREGISTER(regname)   \
    union \
    { \
        register16_t regname; \
        struct \
        { \
            register8_t regname ## L; \
            register8_t regname ## H; \
        }; \

This does not work for C99, which (unfortunately) I need for my project.

The code works with IAR Workbench 5.30.02.


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