STM32 LCD显示正弦波并且设置可以调节振幅的触摸按键代码

下面是一份简单的代码，用于在STM32上使用触摸按键控制LCD显示正弦波，并且可以调节振幅。

首先，我们需要在STM32上配置触摸按键。这里我们使用的是STM32F407开发板和TSC2046触摸芯片。我们需要在初始化函数中配置GPIO和TSC2046，并且设置中断。以下是一个示例：

void Touch_Init(void)
{
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1 | RCC_APB2Periph_ADC2 | RCC_APB2Periph_ADC3, ENABLE);

    GPIO_InitTypeDef GPIO_InitStructure;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    ADC_CommonInitTypeDef ADC_CommonInitStructure;
    ADC_InitTypeDef ADC_InitStructure;

    ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
    ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;
    ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
    ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
    ADC_CommonInit(&ADC_CommonInitStructure);

    ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
    ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1;
    ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
    ADC_InitStructure.ADC_NbrOfConversion = 1;
    ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
    ADC_InitStructure.ADC_ScanConvMode = DISABLE;
    ADC_Init(ADC1, &ADC_InitStructure);

    ADC_Cmd(ADC1, ENABLE);
    ADC_TempSensorVrefintCmd(ENABLE);

    ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_144Cycles);

    ADC_InjectedChannelConfig(ADC1, ADC_Channel_16, 1, ADC_SampleTime_144Cycles);
    ADC_InjectedChannelConfig(ADC1, ADC_Channel_17, 2, ADC_SampleTime_144Cycles);
    ADC_InjectedChannelConfig(ADC1, ADC_Channel_18, 3, ADC_SampleTime_144Cycles);

    ADC_ExternalTrigInjectedConvConfig(ADC1, ADC_ExternalTrigInjecConv_T1_TRGO);

    ADC_ITConfig(ADC1, ADC_IT_JEOC, ENABLE);

    NVIC_InitTypeDef NVIC_InitStructure;
    NVIC_InitStructure.NVIC_IRQChannel = ADC_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    ADC_SoftwareStartInjectedConvCmd(ADC1, ENABLE);
}

接下来，我们需要定义一个函数来计算正弦波，并在LCD上显示它。以下是一个示例：

void Display_SineWave(uint16_t amplitude)
{
    uint16_t x, y;
    uint16_t prev_x = 0, prev_y = 0;
    for (x = 0; x < LCD_WIDTH; x++)
    {
        y = amplitude * sin(x * 2 * M_PI / LCD_WIDTH) + LCD_HEIGHT / 2;

        if (prev_x != 0 && prev_y != 0)
        {
            LCD_DrawLine(prev_x, prev_y, x, y);
        }

        prev_x = x;
        prev_y = y;
    }
}

最后，我们需要在中断处理函数中调用Display_SineWave以显示正弦波。以下是一个示例：

void ADC_IRQHandler(void)
{
    if (ADC_GetITStatus(ADC1, ADC_IT_JEOC) != RESET)
    {
        uint16_t amplitude = ADC_GetInjectedConversionValue(ADC1, ADC_InjectedChannel_1) / 4;
        Display_SineWave(amplitude);
        ADC_ClearITPendingBit(ADC1, ADC_IT_JEOC);
    }
}

现在我们可以通过触摸按键调节振幅，从而在LCD上显示正弦波。完整代码如下：