Mini-F5375-OB开发板测评（AD测量+串口输出）

本文介绍了灵动 Mini-F5375-OB 开发板实现AD转换并通过串口通信输出测量结果。

硬件连接：利用PA0、PA1读取电位器分压后的电压，并通过开发板的PC10、PC11作为UART3输出，串口输出通过USB转TTL接口板连接电脑。

AD初始化代码：

void ADC_Configure(void)
{
    ADC_InitTypeDef  ADC_InitStruct;
    DMA_InitTypeDef  DMA_InitStruct;
    GPIO_InitTypeDef GPIO_InitStruct;
    NVIC_InitTypeDef NVIC_InitStruct;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

    ADC_CalibrationConfig(ADC1, 0x1FE);

    ADC_StructInit(&ADC_InitStruct);
    ADC_InitStruct.ADC_Resolution = ADC_Resolution_12b;
    ADC_InitStruct.ADC_Prescaler  = ADC_Prescaler_16;
    ADC_InitStruct.ADC_Mode       = ADC_Mode_Continue;
    ADC_InitStruct.ADC_DataAlign  = ADC_DataAlign_Right;
    ADC_Init(ADC1, &ADC_InitStruct);

    ADC_DMACmd(ADC1, ENABLE);

    ADC_SampleTimeConfig(ADC1, ADC_Channel_0, ADC_SampleTime_240_5);
    ADC_SampleTimeConfig(ADC1, ADC_Channel_1, ADC_SampleTime_240_5);

    ADC_AnyChannelNumCfg(ADC1, 1);
    ADC_AnyChannelSelect(ADC1, ADC_AnyChannel_0, ADC_Channel_0);
    ADC_AnyChannelSelect(ADC1, ADC_AnyChannel_1, ADC_Channel_1);
    ADC_AnyChannelCmd(ADC1, ENABLE);

    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);

    /* PA4(ROT1) PA5(POT2) */
    GPIO_StructInit(&GPIO_InitStruct);
    GPIO_InitStruct.GPIO_Pin   = GPIO_Pin_0 | GPIO_Pin_1;
    GPIO_InitStruct.GPIO_Speed = GPIO_Speed_High;
    GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_AIN;
    GPIO_Init(GPIOA, &GPIO_InitStruct);

    ADC_Cmd(ADC1, ENABLE);

    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

    DMA_DeInit(DMA1_Channel1);

    DMA_StructInit(&DMA_InitStruct);
    DMA_InitStruct.DMA_PeripheralBaseAddr = (uint32_t)&(ADC1->ADDATA);
    DMA_InitStruct.DMA_MemoryBaseAddr     = (uint32_t)&ADC_Buffer;
    DMA_InitStruct.DMA_DIR                = DMA_DIR_PeripheralSRC;
    DMA_InitStruct.DMA_BufferSize         = 20;
    DMA_InitStruct.DMA_PeripheralInc      = DMA_PeripheralInc_Disable;
    DMA_InitStruct.DMA_MemoryInc          = DMA_MemoryInc_Enable;
    DMA_InitStruct.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
    DMA_InitStruct.DMA_MemoryDataSize     = DMA_MemoryDataSize_HalfWord;
    DMA_InitStruct.DMA_Mode               = DMA_Mode_Circular;
    DMA_InitStruct.DMA_Priority           = DMA_Priority_High;
    DMA_InitStruct.DMA_M2M                = DMA_M2M_Disable;
    DMA_InitStruct.DMA_Auto_Reload        = DMA_Auto_Reload_Disable;
    DMA_Init(DMA1_Channel1, &DMA_InitStruct);

    DMA_ClearFlag(DMA1_FLAG_TC1);
    DMA_ITConfig(DMA1_Channel1, DMA_IT_TC, ENABLE);

    NVIC_InitStruct.NVIC_IRQChannel = DMA1_CH1_IRQn;
    NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStruct.NVIC_IRQChannelSubPriority = 1;
    NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStruct);

    DMA_Cmd(DMA1_Channel1, ENABLE);
}
   串口初始化代码：
   void PLATFORM_InitConsole(uint32_t Baudrate)
{
    GPIO_InitTypeDef GPIO_InitStruct;
    USART_InitTypeDef USART_InitStruct;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);

    USART_StructInit(&USART_InitStruct);
    USART_InitStruct.USART_BaudRate   = Baudrate;
    USART_InitStruct.USART_StopBits   = USART_StopBits_1;
    USART_InitStruct.USART_Parity     = USART_Parity_No;
    USART_InitStruct.USART_Mode       = USART_Mode_Rx | USART_Mode_Tx;
    USART_Init(USART3, &USART_InitStruct);

    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOC, ENABLE);

    GPIO_PinAFConfig(GPIOC, GPIO_PinSource10, GPIO_AF_7);   //PC11/UART3_RX  PC10/UART3_TX  
    GPIO_PinAFConfig(GPIOC, GPIO_PinSource11, GPIO_AF_7);   //PC11/UART3_RX  PC10/UART3_TX  

    GPIO_StructInit(&GPIO_InitStruct);
    GPIO_InitStruct.GPIO_Pin   = GPIO_Pin_10|GPIO_Pin_11;
    GPIO_InitStruct.GPIO_Speed = GPIO_Speed_High;
    GPIO_InitStruct.GPIO_Mode  = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOC, &GPIO_InitStruct);

    USART_Cmd(USART3, ENABLE);
}
   功能函数代码：
   void ADC_AnyChannel_ContinuousScan_DMA_Interrupt_Sample(void)
{
    uint8_t  i = 0, j = 0;
    uint32_t RVxSum = 0;
    float    RVxAverage[2], RVxVoltage[2];

    printf("\r\nTest %s", __FUNCTION__);

    ADC_Configure();

    ADC_SoftwareStartConvCmd(ADC1, ENABLE);

    while (1)
    {
        if (0 != ADC_DMA_InterruptFlag)
        {
            ADC_DMA_InterruptFlag = 0;

            for (i = 0; i < 2; i++)
            {
                RVxSum = 0;

                for (j = 0; j < 10; j++)
                {
                    RVxSum += ADC_Buffer[i + j * 2];
                }

                RVxAverage[i] = (float)RVxSum / (float)10.0;
            }

            printf("\r\n");

            for (i = 0; i < 2; i++)
            {
                RVxVoltage[i] = RVxAverage[i] * (float)3.3 / (float)4096.0;

                printf("POT%d Voltage = %0.2f\t", i + 1, RVxVoltage[i]);
            }
        }
    }
}

输出显示：采用SSCOM V5.13.1进行显示，串口设置为波特率115200,8位数据位，1位停止位。无校验和流控制。
总结：
本文介绍了灵动 Mini-F5375-OB 开发板AD转换功能、DMA功能以及串口通讯的初始化和使用，熟悉了LIB库的使用方法。