Re: [avr-gcc-list] AVR223 for GCC

[Joerg Wunsch]

address@hidden wrote:

> The application I am trying to use with GCC is the Appnote 223 which
> has the major filters written in the IARCC format.

What's so difficult about it?  After looking into one of the files, it
took me only a few minutes to figure out what needs to be changed.
Context diff for one file below.  Of course, if i were you, i'd
probably automate the process.

The biggest problem seems to be that the IAR assembler uses \1 etc.
for positional macro arguments, while the GNU assembler expects
explicitly named positional arguments for its macros.

Note that i have also removed all \r characters from the file, it
might be required (but i'm not sure).

Make sure you generate a file ending in .S (a capital letter S) since
this will make avr-gcc also invoke the C preprocessor.

--- 2nd_order_FIR.s90   Fri Jun  7 11:46:50 2002
+++ 2nd_order_FIR.S     Mon Feb 17 16:42:29 2003
@@ -50,9 +50,8 @@
 ;*       INIT:  Depending on compiler settings (135 cycles)
 ;*       FILTER:  60 instructions; 80 cycles (excl. ret)
 ;*****************************************************
-       NAME    assembly(16)
-       PUBLIC  FIR2
-       RSEG    CODE
+       .global FIR2
+       .text
 
 ;ZERO register (used to add carry flag)
 #define ZERO  R2
@@ -91,22 +90,22 @@
 ;**************************************************
 ;* MACROS
 ;**************************************************
-LOAD_NODE MACRO
-       ldd       DATAL,Z+\1            ; Load low byte of node 
-       ldd       DATAH,Z+\1+1          ; Load high byte of node
-    ENDM
-
-UPDATE_NODE MACRO
-       std       Z+\1, DATAL           ; Update low byte of node to prepare 
next filter run
-       std       Z+\1+1, DATAH         ; Update high byte of node to prepare 
next filter run
-    ENDM
-
-LOAD_COEF MACRO
-       ldd       COEFL,Z+\1            ; Load low byte of node 
-       ldd       COEFH,Z+\1+1          ; Load high byte of node
-    ENDM
+.macro LOAD_NODE a
+       ldd       DATAL,Z+\a            ; Load low byte of node 
+       ldd       DATAH,Z+\a+1          ; Load high byte of node
+    .ENDM
+
+.macro UPDATE_NODE a
+       std       Z+\a, DATAL           ; Update low byte of node to prepare 
next filter run
+       std       Z+\a+1, DATAH         ; Update high byte of node to prepare 
next filter run
+    .ENDM
+
+.macro LOAD_COEF a
+       ldd       COEFL,Z+\a            ; Load low byte of node 
+       ldd       COEFH,Z+\a+1          ; Load high byte of node
+    .ENDM
 
-MUL_MOV_24 MACRO
+.macro MUL_MOV_24
        muls  COEFH, DATAH              ; Signed multiply, coefficient high 
byte and data high byte
        mov       AC2, r0                       ; Copy low byte into 
accumulator byte 2 (sign bit automatically correct)
 
@@ -121,9 +120,9 @@
        mulsu DATAH, COEFL              ; Signed-unsigned multiply, data high 
byte and coefficient low byte
        add       AC1, r0                       ; Add low byte of result to 
accumulator byte 1
        adc       AC2, r1                       ; Add with carry high byte of 
result to accumulator byte 2
-    ENDM
+    .ENDM
 
-SMAC24 MACRO
+.macro SMAC24
        muls  COEFH, DATAH              ; Signed multiply, coefficient high 
byte and data high byte
        add       AC2, r0                       ; Copy low byte into 
accumulator byte 2
 
@@ -139,7 +138,7 @@
        mulsu DATAH, COEFL              ; Signed-unsigned multiply, data high 
byte and coefficient low byte 
        add       AC1, r0                       ; Add low byte of result to 
accumulator byte 1
        adc       AC2, r1                       ; Add with carry high byte of 
result to accumulator byte 2
-    ENDM
+    .ENDM
        
 ;*****************************************************
 ; FIR filter function
@@ -181,4 +180,3 @@
 ;Return the value stored in accumulator AC2 and AC1 (which are the return 
registers)
        ret
     
-    END

-- 
J"org Wunsch                                           Unix support engineer
address@hidden        http://www.interface-systems.de/~j/