Compiler/EK-TM4C1294XL: Request for the Alternative Function Migration.

Sai Aditya Reddy Santha Kulluru

Intellectual 360 points

Part Number: EK-TM4C1294XL

Tool/software: TI C/C++ Compiler

Dear All,

I'm migrating from LM3S9B92 MCU to TM4C1294NCPNDT MCU devices. I have come across some difficulties.

1) Could someone suggest the alternative function for FlashUsecGet() in TivaWare for TM4C1294NCPNDT.

2) What does mean by undefined symbol " g_psCmdTable " first referenced in the file " ./cmdline.obj ".

Looking forward to hearing from you all.

Thanks,

Sai

over 5 years ago

0 Bob Crosby over 5 years ago

TI__Guru 72500 points

On the TM4C1294 device you don't typically need FlashUsecGet() because you do not need to set the flash clock with FlashUsecSet(). If you need to determine the speed of the system clock, it is recommended that you store the return value of the function SysCtlClockFreqSet() in a global variable like shown below:

    //
    // Run from the PLL at 120 MHz.
    //
    g_ui32SysClock = SysCtlClockFreqSet((SYSCTL_XTAL_25MHZ |
                                       SYSCTL_OSC_MAIN |
                                       SYSCTL_USE_PLL |
                                       SYSCTL_CFG_VCO_480), 120000000);

The variable g_ui32SysClock will contain the number of system clock cycles per second. To get system clocks per uS, divide by 1000000.

The "undefined symbol" error means that somewhere in the file "cmdline.c" (assuming it is C code) it references what should be (by naming convention) a global symbol "g_psCmdTable". But that symbol is not defined, or at least not defined at a global scope.

0 Sai Aditya Reddy Santha Kulluru over 5 years ago in reply to Bob Crosby

Intellectual 360 points

Dear Bob,

I have a question. How to mention the g_ui32SysClock as a Global variable so that it can be shared with other source file? Please let me know.

I have declared in one source file as

uint32_t g_ui32SysClock;

int main(){

// Run from the PLL at 120 MHz.

//

g_ui32SysClock = SysCtlClockFreqSet((SYSCTL_XTAL_25MHZ |

SYSCTL_OSC_MAIN |

SYSCTL_USE_PLL |

SYSCTL_CFG_VCO_480), 120000000);

return 0;

}

Could you please let me know, How to share the g_ui32SysClock variable in other source files as well? Since I'm using same variable in other source file and compile error generates as well "" Identifier g_ui32SysClock is undefined in this file ""

Thanks,

Sai

0 Bob Crosby over 5 years ago in reply to Sai Aditya Reddy Santha Kulluru

TI__Guru 72500 points

In all the files that reference g_ui32SysClock, you should declare it as extern:

extern uint32_t g_ui32SysClock;

This is often done in a .h file that is then included in each of the C files.

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Compiler/EK-TM4C1294XL: Request for the Alternative Function Migration.