I am using RIDE 2.1.1 to program an ST72264 MCU. I have used the Rbuilder to generate most of the C code framework. I am using SPI, I2C, WDG, IO, and MCC peripherals. I have barely started to program and have run into a linker error that indicates I am out of data memory (Error 107 : Address Space Overflow -Segment: ?DT?SPI(SPI)). I have confirmed this by increasing the data memory and seeing that it links successfully (also indicating in the map report that it needs 3 more bytes than was originally specified).

That led me to look at the map report to see how the memory was being used. This showed only 5 bytes of overlaid data memory, spanning only 4 functions and 2 modules. This seems pretty inefficient to me and likely to cause problems. I have included the data memory map below (with invoke info).

INVOKED BY:
RLST7 
C:\TEMP\CODING\IO.OBJ,C:\TEMP\CODING\MCC.OBJ,C:\TEMP\CODING\ITC.OBJ,C:\TEMP\CODING\WDG.OBJ,C:\TEMP\CODING\I2C.OBJ,C:\TEMP\CODING\SPI.OBJ 
,"C:\TEMP\CODING\CHASE LIGHTMAIN.OBJ","C:\TEMP\CODING\CHASE LIGHTINT.OBJ",C:\TEMP\CODING\STSERIALFLASH.OBJ 
TO("C:\TEMP\CODING\CHASE LIGHT.AOF") CODESIZE(02000H) RAMSIZE(0200H) 
DATASTART(080H) STACKSIZE(080H) LIBPATH(C:\RIDE\LIB\ST7) 
PR("C:\TEMP\CODING\CHASE LIGHT.MS7") IX SCINAME(ST72264) 
 WITHOUT ANY FLOATING POINT ARITHMETIC

(snip)

LINK MAP OF MODULE: C:\TEMP\CODING\CHASE LIGHT.AOF (IO)
   TYPE     BASE         LENGTH     RELOCATION      SEGMENT NAME
   ----     ----         ------     ----------      ------------
   * * * * * * * *   D A T A       M E M O R Y   * * * * * * * *
   DATA     0080H        0007H      PAGE0           ?D0?IO_Input?IO
   DATA     0087H        0005H      PAGE0           ?D0?IO_Output?IO
   DATA     008CH        0002H      PAGE0           ?D0?IO_Read?IO
   DATA     008EH        0002H      PAGE0           ?D0?IO_ByteWrite?IO
   DATA     0090H        0002H      PAGE0           ?D0?MCC_SlowMode?MCC
   DATA     0092H        0005H      PAGE0           ?D0?ITC_GetPriority?ITC
   DATA     0097H        0003H      PAGE0           ?D0?ITC_ConfigureInterrupt?ITC
   DATA     009AH        0009H      PAGE0           ?D0?WDG_ComputeTimeout?WDG
   DATA     00A3H        0003H      PAGE0           ?D0?I2C_PutString?I2C
   DATA     00A6H        0006H      PAGE0           ?D0?I2C_PutBuffer?I2C
   DATA     00ACH        0002H      PAGE0           ?D0?I2C_IsTransmitCompleted?I2C
   DATA     00AEH        0005H      PAGE0           ?D0?I2C_GetBuffer?I2C
   DATA     00B3H        0002H      PAGE0           ?D0?I2C_IsReceptionCompleted?I2C
   DATA     00B5H        0002H      PAGE0           ?D0?SPI_Init?SPI
   DATA     00B7H        0001H      PAGE0           ?D0?SPI_Clear_Flags?SPI
   DATA     00B8H        0007H      PAGE0           ?D0?SPI_PutBuffer?SPI
   DATA     00BFH        0006H      PAGE0           ?D0?SPI_PutString?SPI
            00C5H        0004H      OVERLAID GROUP  *** 
   DATA     00C5H        0004H      -------------   ?D0?IO_Write?IO
   DATA     00C5H        0001H      -------------   ?D0?SPI_IsReceptionCompleted?SPI
   DATA     00C5H        0001H      -------------   ?D0?SPI_GetBuffer?SPI
   DATA     00C5H        0001H      -------------   ?D0?SPI_IsTransmitCompleted?SPI
   DATA     00C9H        0005H      PAGE0           ?D0?main?CHASE LIGHTMAIN
   DATA     00CEH        0003H      PAGE0           ?D0?STSerFlash_WriteEnable?STSERIALFLASH
   DATA     00D1H        0003H      PAGE0           ?D0?STSerFlash_WriteDisable?STSERIALFLASH
   DATA     00D4H        0004H      PAGE0           ?D0?STSerFlash_ReadID?STSERIALFLASH
   DATA     00D8H        0008H      PAGE0           ?D0?STSerFlash_CmdRead?STSERIALFLASH
   DATA     00E0H        0006H      PAGE0           ?D0?STSerFlash_ReadStat1x?STSERIALFLASH
   DATA     00E6H        0004H      PAGE0           SEG_REGISTERS
   DATA     00EAH        0002H      INSECTION       ?DT?ITC
   DATA     00ECH        000BH      INSECTION       ?DT?I2C
   DATA     00F7H        000CH      INSECTION       ?DT?SPI
            0103H        007DH                       *** GAP ***
   DATA     0180H        0080H      UNIT            ?C_STACK?SEG

(snip)

EXECUTABLE SUMMARY:
-------------------
    Total EEPROM storage requirement:  0000H (0)
    Total DATA storage requirement:  0103H (259)
    Total CODE storage requirement:  0EB1H (3761)

REFERENCE MAP OF MODULE: C:\TEMP\CODING\CHASE LIGHT.AOF (CHASE LIGHT)

SEGMENT
   +-->CALLED SEGMENT
---------------------
?PR?IO_Input?IO
   +-->?PR?IO

?PR?IO_Output?IO
   +-->?PR?IO

?PR?IO_Read?IO
   +-->?PR?IO

?PR?IO_Write?IO
   +-->?PR?IO

?PR?IO_ByteWrite?IO
   +-->?PR?IO

?PR?ITC_GetPriority?ITC
   +-->CSTDLIB
   +-->CSTDLIB

?PR?WDG_ComputeTimeout?WDG
   +-->CSTDLIB
   +-->CSTDLIB
   +-->CSTDLIB
   +-->CSTDLIB
   +-->CSTDLIB
   +-->CSTDLIB

?PR?SPI_Init?SPI
   +-->?PR?SPI_Clear_Flags?SPI

?PR?STSerFlash_WriteEnable?STSERIALFLASH
   +-->?PR?SPI_IsTransmitCompleted?SPI
   +-->?PR?SPI_PutByte?SPI
   +-->?PR?IO_Write?IO

?PR?STSerFlash_WriteDisable?STSERIALFLASH
   +-->?PR?SPI_IsTransmitCompleted?SPI
   +-->?PR?SPI_PutByte?SPI
   +-->?PR?IO_Write?IO

?PR?STSerFlash_CmdRead?STSERIALFLASH
   +-->?PR?SPI_IsReceptionCompleted?SPI
   +-->?PR?SPI_GetBuffer?SPI
   +-->?PR?SPI_IsTransmitCompleted?SPI
   +-->?PR?SPI_PutByte?SPI
   +-->?PR?IO_Write?IO

?PR?STSerFlash_ReadID?STSERIALFLASH
   +-->?PR?STSerFlash_CmdRead?STSERIALFLASH

?PR?STSerFlash_ReadStat1x?STSERIALFLASH
   +-->?PR?SPI_IsReceptionCompleted?SPI
   +-->?PR?SPI_GetBuffer?SPI
   +-->?PR?SPI_IsTransmitCompleted?SPI
   +-->?PR?SPI_PutByte?SPI
   +-->?PR?IO_Write?IO

IO.c functions contain volatile local variables (reason unknown), whch could interfere with overlay on that data. However, this doesn't explain the rest of the segments. It seems that there are a lot of basic local variables that could share memory space.

Any suggestions on this would be greatly appreciated. If more info is needed, let me know.

Thanks in advance,
Torrey