C error "subscripted value is neither array nor pointer"

Question

I have been having some problems with the segment of code below.

#include "stm32f0xx_tim.h"
#include "stm32f0xx_adc.h"
#include "stm32f0xx_rcc.h"
#include "stm32f0xx_conf.h"
#include "adc.h"

void calcSensor(float voltage1, float voltage2, int X, int Y)
{
    float Iload = 0;
    float Vsensor = 0;
    float Rsensor = 0;
    float Vdrop = voltage1 - voltage2;
    uint32_t resistance = 0;
    Iload = Vdrop/Rload;
    Vsensor = Vin - Iload*Rmux - Iload*Rdemux-Vdrop;
    resistance = Vsensor/Iload;
    Rsensor[1][5] = resistance;
    Y++;
    if (Y == 22)
    {
        Y = 0;
        X++;
        if (X == 44)
        {
            X = 0;
        }

    }
}
void initRArray(void)
{
    int x;
    int y;
    for(x = 0; x < 44; x++) 
    { 
        for(y = 0; y < 22; y++)
        {
            Rsensor[x][y] = 0;
        }   
    }
}

The error comes the line:

Rsensor[1][5] = resistance;

The error is the same as the title:

subscripted value is neither array nor pointer

I originally had X and Y for indicies but have switched to 0 and 5 thinking it may have been an issue. That did not fix it. Additionally, I have the intRarray function which sets all values to 0. This array compiles fine, and it is using the same array that is having issues.

Below is the declaration of the array in the header file.

unsigned long int Rsensor[44][22];

Kerrek SB · Accepted Answer · 2014-04-05 22:25:30Z

3

You have a local variable float Rsensor = 0; which shadows the global array. Rename one of the two.

answered Apr 5, 2014 at 22:25

Kerrek SB

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2 Comments

M.M Over a year ago

Hungarian notation would have avoided this problem ;)

Kerrek SB Over a year ago

@MattMcNabb: We had a problem with our variable names, so we introduced Hungarian notation. Now we have two.

Keith Thompson · Accepted Answer · 2014-04-05 22:54:18Z

0

You have the following declaration in the program

float Rsensor = 0;

This makes Rsensor a float variable, not an array.

edited Apr 5, 2014 at 22:54

Keith Thompson

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answered Apr 5, 2014 at 22:26

GoldRoger

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