急！急！ CCS中添加按键程序

void key_control(void)
{
    key_s1  = HAL_readGpio(halHandle, (GPIO_Number_e)HAL_keyGpio_1);
    key_s2  = HAL_readGpio(halHandle, (GPIO_Number_e)HAL_keyGpio_2);
    key_s3  = HAL_readGpio(halHandle, (GPIO_Number_e)HAL_keyGpio_3);

    if(HAL_readGpio(halHandle, (GPIO_Number_e)HAL_keyGpio_x) ==LOW)
    {
        usDelay(50);
        if(HAL_readGpio(halHandle, (GPIO_Number_e)HAL_keyGpio_x)==LOW)
        {
            while(HAL_readGpio(halHandle, (GPIO_Number_e)HAL_keyGpio_x)==LOW);
            return LOW;
        }
        else
        return HIGH;
    }
    else
        return HIGH;

    while(1)
    {
        if(key_s1==LOW)
            {
             gMotorVars.SpeedRef_krpm = 0.8;
            }
        if(key_s2==LOW)
            {
                gMotorVars.SpeedRef_krpm = -0.8;
            }
        while(1)
        {
            if(key_s3==LOW)
               {
                  gMotorVars.SpeedRef_krpm = 0.8;
                  usDelay(500);
                  gMotorVars.SpeedRef_krpm = -0.8;
                  usDelay(500);
               }
        }

    }

}

遇到的问题，如下：

1、无法用按键进行正反的切换

2、在CCS的监视窗口中，基准速度为1800ramp，这部分的程序在哪里？在main.h中，已经设为0，但在监视窗口中还是1800ramp，为什么？