error: initializer element is not constant (void (*)(void))​((uint32_t​)&__STACK_​TOP)

Hello;

I'm using the CCS C code for serial transmit from my Tiva C launchpad.

The C code works fine, but when I pass it to a function block in Simulink by code.ceval, during the debug I receive this error:

:\Users\Alberto\Desktop\startup_ccs.c:71:22: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast] 
     (void (*)(void))((uint32_t)&__STACK_TOP), 
                      ^ 
C:\Users\Alberto\Desktop\startup_ccs.c:71:5: error: initializer element is not constant 
     (void (*)(void))((uint32_t)&__STACK_TOP), 
     ^ 
C:\Users\Alberto\Desktop\startup_ccs.c:71:5: error: (near initialization for 'g_pfnVectors[0]') 

gmake: *** [startup_ccs.obj] Error -1

I can't understand the error, this is my C code of the main:

#include <stdint.h>
#include <stdio.h>
#include <stdbool.h>
#include <math.h>
#include "hw_ints.h"
#include "hw_memmap.h"
#include "debug.h"
#include "fpu.h"
#include "gpio.h"
#include "interrupt.h"
#include "pin_map.h"
#include "rom.h"
#include "sysctl.h"
#include "uart.h"

#define GPIO_PA0_U0RX           0x00000001
#define GPIO_PA1_U0TX           0x00000401

char car[2000];
double u;
void UARTSend2(const uint8_t *pui8Buffer, uint32_t ui32Count);

//*****************************************************************************
// Send a string to the UART.
void UARTSend2(const uint8_t *pui8Buffer, uint32_t ui32Count)
{

      

      while(ui32Count--) // Loop while there are more characters to send.
      {
          ROM_UARTCharPutNonBlocking(UART0_BASE, *pui8Buffer++);  // Write the next character to the UART.
      }
    }
  //*****************************************************************************
  // This example demonstrates how to send a string of data to the UART.
  int
  main(double u)
  {

      ROM_FPUEnable(); // Enable lazy stacking for interrupt handlers.  This allows floating-point
      ROM_FPULazyStackingEnable(); // instructions to be used within interrupt handlers, but at the expense of extra stack usage.
      ROM_SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN | SYSCTL_XTAL_16MHZ); // Set the clocking to run directly from the crystal.
      ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);    // Enable the GPIO port that is used for the on-board LED.
      ROM_GPIOPinTypeGPIOOutput(GPIO_PORTF_BASE, GPIO_PIN_2); // Enable the GPIO pins for the LED (PF2).
      ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0); // Enable the peripherals used by this example.
      ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
      ROM_IntMasterEnable(); // Enable processor interrupts.
      GPIOPinConfigure(GPIO_PA0_U0RX); // Set GPIO A0 and A1 as UART pins.
      GPIOPinConfigure(GPIO_PA1_U0TX);
      ROM_GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1);
      ROM_UARTConfigSetExpClk(UART0_BASE, ROM_SysCtlClockGet(), 115200,  // Configure the UART for 115,200, 8-N-1 operation.
                              (UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE |
                               UART_CONFIG_PAR_NONE));

        u=1234;
        int cont=(log10(u))+6;
        sprintf (car,"%.2f\r\n",u);
        UARTSend2((uint8_t *) car,cont); // Prompt for text to be entered.

}

And this is the code from the file that receive the error:

...
#pragma DATA_SECTION(g_pfnVectors, ".intvecs")
void (* const g_pfnVectors[])(void) =
{
    (void (*)(void))((uint32_t)&__STACK_TOP),
                                            // The initial stack pointer
    ResetISR,                               // The reset handler
    NmiSR,                                  // The NMI handler
    FaultISR,                               // The hard fault handler
....

Can you help me to find the solution?

Thanks

[Walter Roberson]

duplicates http://www.mathworks.com/matlabcentral/answers/280135-how-to-solve-these-errors-error-initializer-element-is-not-constant-void-void-uint32_t-_

Answer 1

[Venkatachala Sarma]

Hi Alberto,

Could you paste your MALTAB coder in the MATLAB Function block here?