armfly/User/Bsp/adc/adc.c

/*
*********************************************************************************************************
*
*	模块名称 : ADC驱动模块
*	文件名称 : adc.c
*	版    本 : V1.0
*	说    明 : ADC3的DMA工作方式
*	修改记录 :
*
*********************************************************************************************************
*/

#include "adc.h"
/* define ---------------------------------------------------------------------*/
#define ADC3_DR_ADDRESS ((uint32_t)0x4001224C)

/* 变量 ----------------------------------------------------------------------*/
__IO uint16_t ADC3ConvertedValue[2];
__IO uint32_t ADC3ConvertedVoltage = 0;

void dma_config()
{
    DMA_InitTypeDef DMA_InitStructure;
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE); // DMA2时钟使能

    DMA_DeInit(DMA2_Stream0);
    /* DMA2 Stream0 channel2 配置 **************************************/
    DMA_InitStructure.DMA_Channel            = DMA_Channel_2;
    DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC3_DR_ADDRESS;
    DMA_InitStructure.DMA_Memory0BaseAddr    = (uint32_t)ADC3ConvertedValue;
    DMA_InitStructure.DMA_DIR                = DMA_DIR_PeripheralToMemory;
    DMA_InitStructure.DMA_BufferSize         = 2;
    DMA_InitStructure.DMA_PeripheralInc      = DMA_PeripheralInc_Disable;
    DMA_InitStructure.DMA_MemoryInc          = DMA_MemoryInc_Enable;
    DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
    DMA_InitStructure.DMA_MemoryDataSize     = DMA_MemoryDataSize_HalfWord;
    DMA_InitStructure.DMA_Mode               = DMA_Mode_Circular;
    DMA_InitStructure.DMA_Priority           = DMA_Priority_High;
    DMA_InitStructure.DMA_FIFOMode           = DMA_FIFOMode_Disable;
    DMA_InitStructure.DMA_FIFOThreshold      = DMA_FIFOThreshold_HalfFull;
    DMA_InitStructure.DMA_MemoryBurst        = DMA_MemoryBurst_Single;
    DMA_InitStructure.DMA_PeripheralBurst    = DMA_PeripheralBurst_Single;
    DMA_Init(DMA2_Stream0, &DMA_InitStructure);
    DMA_Cmd(DMA2_Stream0, ENABLE);
}
/*
*********************************************************************************************************
*	函 数 名: adc3_init
*	功能说明: ADC初始化
*	形    参: 无
*	返 回 值: 无
*********************************************************************************************************
*/
void adc3_init(void)
{
    ADC_InitTypeDef       ADC_InitStructure;
    ADC_CommonInitTypeDef ADC_CommonInitStructure;
    DMA_InitTypeDef       DMA_InitStructure;
    GPIO_InitTypeDef      GPIO_InitStructure;

    /* 使能 ADC3, DMA2 和 GPIO 时钟 ****************************************/
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2 | RCC_AHB1Periph_GPIOF | RCC_AHB1Periph_DMA1, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC3, ENABLE);

    /* DMA2 Stream0 channel2 配置 **************************************/
    DMA_InitStructure.DMA_Channel            = DMA_Channel_2;
    DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC3_DR_ADDRESS;
    DMA_InitStructure.DMA_Memory0BaseAddr    = (uint32_t)ADC3ConvertedValue;
    DMA_InitStructure.DMA_DIR                = DMA_DIR_PeripheralToMemory;
    DMA_InitStructure.DMA_BufferSize         = 2;
    DMA_InitStructure.DMA_PeripheralInc      = DMA_PeripheralInc_Disable;
    DMA_InitStructure.DMA_MemoryInc          = DMA_MemoryInc_Enable;
    DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
    DMA_InitStructure.DMA_MemoryDataSize     = DMA_MemoryDataSize_HalfWord;
    DMA_InitStructure.DMA_Mode               = DMA_Mode_Circular;
    DMA_InitStructure.DMA_Priority           = DMA_Priority_High;
    DMA_InitStructure.DMA_FIFOMode           = DMA_FIFOMode_Disable;
    DMA_InitStructure.DMA_FIFOThreshold      = DMA_FIFOThreshold_HalfFull;
    DMA_InitStructure.DMA_MemoryBurst        = DMA_MemoryBurst_Single;
    DMA_InitStructure.DMA_PeripheralBurst    = DMA_PeripheralBurst_Single;
    DMA_Init(DMA2_Stream0, &DMA_InitStructure);
    DMA_Cmd(DMA2_Stream0, ENABLE);

    /* 配置ADC3通道7引脚为模拟输入模式******************************/
    GPIO_InitStructure.GPIO_Pin  = GPIO_Pin_9;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(GPIOF, &GPIO_InitStructure);

    /****************************************************************************
      PCLK2 = HCLK / 2
      下面选择的是2分频
      ADCCLK = PCLK2 /2 = HCLK / 4 = 168 / 4 = 42M
      ADC采样频率： Sampling Time + Conversion Time = 3 + 12 cycles = 15cyc
                    Conversion Time = 42MHz / 15cyc = 2.8Mbps.
    *****************************************************************************/
    /* ADC公共部分初始化**********************************************************/
    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);

    /* ADC3 初始化 ****************************************************************/
    ADC_InitStructure.ADC_Resolution           = ADC_Resolution_12b;
    ADC_InitStructure.ADC_ScanConvMode         = DISABLE;
    ADC_InitStructure.ADC_ContinuousConvMode   = ENABLE;
    ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
    ADC_InitStructure.ADC_ExternalTrigConv     = ADC_ExternalTrigConv_T1_CC1;
    ADC_InitStructure.ADC_DataAlign            = ADC_DataAlign_Right;
    ADC_InitStructure.ADC_NbrOfConversion      = 1;
    ADC_Init(ADC3, &ADC_InitStructure);

    /* ADC3 规则 channel7 配置 *************************************/
    ADC_RegularChannelConfig(ADC3, ADC_Channel_7, 1, ADC_SampleTime_3Cycles);

    /* 使能DMA请求(单ADC模式) */
    ADC_DMARequestAfterLastTransferCmd(ADC3, ENABLE);

    /* 使能 ADC3 DMA */
    ADC_DMACmd(ADC3, ENABLE);

    /* 使能 ADC3 */
    ADC_Cmd(ADC3, ENABLE);

    /* 软件启动ADC转换 */
    ADC_SoftwareStartConv(ADC3);
}

/***************************** 安富莱电子 www.armfly.com (END OF FILE) *********************************/