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// 温度センサ値取得/表示 バックグラウンドサービス
void f_1(void)
{
    static int stage = 0, temper, wait;
 
    switch (stage) {
    case 0:                    // 温度センサの値取得
        temper = get_temper();
        stage++;
        return;
    case 1:                    // 値表示
        print_temper(temper);
        wait = 0;
        stage++;
        return;
    case 2:                    // wait
        wait++;
        if (wait >= 1000) {
            stage++;
        }
        return;
    default:                   // 最初に戻る
        stage = 0;
        return;
    }
}
 
// メイン
void main(void)
{
    while (1) {
        f_1();  // 温度センサ値取得/表示
        f_2();  // 圧力センサ　〃
        f_3();  // 加速度　　　〃
        //…
    }
}
 

prog.c: In function ‘f_1’:
prog.c:8:9: warning: implicit declaration of function ‘get_temper’ [-Wimplicit-function-declaration]
         temper = get_temper();
         ^
prog.c:12:9: warning: implicit declaration of function ‘print_temper’ [-Wimplicit-function-declaration]
         print_temper(temper);
         ^
prog.c: At top level:
prog.c:29:6: warning: return type of ‘main’ is not ‘int’ [-Wmain]
 void main(void)
      ^
prog.c: In function ‘main’:
prog.c:33:9: warning: implicit declaration of function ‘f_2’ [-Wimplicit-function-declaration]
         f_2();  // 圧力センサ　〃
         ^
prog.c:34:9: warning: implicit declaration of function ‘f_3’ [-Wimplicit-function-declaration]
         f_3();  // 加速度　　　〃
         ^
/home/nyyEtL/ccsDDHdK.o: In function `f_1':
prog.c:(.text+0x29): undefined reference to `get_temper'
prog.c:(.text+0x71): undefined reference to `print_temper'
/home/nyyEtL/ccsDDHdK.o: In function `main':
prog.c:(.text.startup+0xe): undefined reference to `f_2'
prog.c:(.text.startup+0x13): undefined reference to `f_3'
collect2: error: ld returned 1 exit status

Standard output is empty