Save variable in struct by pointer

I have a problem with my code that I can not solve, I think it's a simple detail, but I have not found it yet.

I need to pass by reference a vector, which has a struct, but it is not allocating the data in the struct and the program closes.

This is one of the functions:

    void cadastProd(Produto *cP) {
    system("cls");

    arquivo = fopen(PRO,"a+");
    printf("\n|************************************************|");
    printf("\n|*              CADASTRAR PRODUTO               *|");
    printf("\n|************************************************|");

    printf("\n\n  Informe o numero de produtos: ");
    scanf("%d",&q);
    for(i=0; i<q; i++) {
        (*cP).codigo[i] = i+1; // Codigo do Produto
        fflush(stdin);
        printf("\n  Nome do Produto: ");
        scanf(" %[^\n]s", &cP->nome[i]);
        printf("\n  Valor do Produto: ");
        scanf("%f", &cP->valor[i]);
        printf("\n  ");
        printf("%d - %s - R$%.2f\n", cP->codigo[i], cP->nome[i], cP->valor[i]);
        fprintf(arquivo,"%d - %s - R$%.2f\n", cP->codigo[i], cP->nome[i], cP->valor[i]);
    }
    fclose(arquivo);{
}

The struct of this function is this here:

    typedef struct produto {
    char codigo[30];
    char nome[30];
    float valor[30];
} Produto;

I'd like some help on what I might be missing. Thanks