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XRAM and Memory Model

Raul GG

Hi everybody!

I'm using a uC ADuC842 (based in 8052 core). It has 2 KB of XRAM On-Chip.

I have a test program (C code) which do some operations with float numbers and send results to the serial port.

When I use this compiler configuration:
- Memory Model: small: variables in DATA
- Code ROM Size: Large: 64K program

I haven't any problem and compiled code runs perfectly in ADuC842.

When I change compiler configuration to:
- Memory Model: Large: variables in XDATA
- Code ROM Size: Large: 64K program
- Check Boxes selected:
+ Use On-Chip ROM (0x0-0xF7FF)
+ Use On-Chip XRAM (0x-0x7FF)

I simulate compiled code with uVision and it runs perfecly (like before), but when I run compiled code in ADuC842 it doesn't work.

It seems that I have problems using XRAM, but I don't know where.

Sombody can help me?

Comment: I have researched along the Disscusion Forum and I have read that it's necessary use startup.a51 to initialize uC. I don't know how call that segment in my C code program. Can this solve my problem?

Thaks!!

Parents
  • 0

    Hi everybody!

    I'm using a uC ADuC842 (based in 8052 core). It has 2 KB of XRAM On-Chip.

    I have a test program (C code) which do some operations with float numbers and send results to the serial port.

    When I use this compiler configuration:
    - Memory Model: small: variables in DATA
    - Code ROM Size: Large: 64K program

    I haven't any problem and compiled code runs perfectly in ADuC842.

    When I change compiler configuration to:
    - Memory Model: Large: variables in XDATA
    - Code ROM Size: Large: 64K program
    - Check Boxes selected:
    + Use On-Chip ROM (0x0-0xF7FF)
    + Use On-Chip XRAM (0x-0x7FF)

    I simulate compiled code with uVision and it runs perfecly (like before), but when I run compiled code in ADuC842 it doesn't work.

    It seems that I have problems using XRAM, but I don't know where.

    Sombody can help me?

    Comment: I have researched along the Disscusion Forum and I have read that it's necessary use startup.a51 to initialize uC. I don't know how call that segment in my C code program. Can this solve my problem?

    Thaks!!

Reply
  • 0

    Hi everybody!

    I'm using a uC ADuC842 (based in 8052 core). It has 2 KB of XRAM On-Chip.

    I have a test program (C code) which do some operations with float numbers and send results to the serial port.

    When I use this compiler configuration:
    - Memory Model: small: variables in DATA
    - Code ROM Size: Large: 64K program

    I haven't any problem and compiled code runs perfectly in ADuC842.

    When I change compiler configuration to:
    - Memory Model: Large: variables in XDATA
    - Code ROM Size: Large: 64K program
    - Check Boxes selected:
    + Use On-Chip ROM (0x0-0xF7FF)
    + Use On-Chip XRAM (0x-0x7FF)

    I simulate compiled code with uVision and it runs perfecly (like before), but when I run compiled code in ADuC842 it doesn't work.

    It seems that I have problems using XRAM, but I don't know where.

    Sombody can help me?

    Comment: I have researched along the Disscusion Forum and I have read that it's necessary use startup.a51 to initialize uC. I don't know how call that segment in my C code program. Can this solve my problem?

    Thaks!!

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