ADC初始化
void MX_ADC_Init(void)
{
ADC_ChannelConfTypeDef sConfig;
GPIO_InitTypeDef GPIO_InitStruct;
/* Peripheral clock enable */
__HAL_RCC_GPIOA_CLK_ENABLE();
__HAL_RCC_ADC1_CLK_ENABLE();
GPIO_InitStruct.Pin = GPIO_PIN_6|GPIO_PIN_7;
GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
hadc.Instance = ADC1;
if (HAL_ADC_DeInit(&hadc) != HAL_OK)
{
Error_Handler();
}
hadc.Instance = ADC1;
hadc.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4;
hadc.Init.Resolution = ADC_RESOLUTION_12B;
hadc.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc.Init.ScanConvMode = ADC_SCAN_ENABLE;
hadc.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
hadc.Init.LowPowerAutoWait = DISABLE;
hadc.Init.LowPowerAutoPowerOff = DISABLE;
hadc.Init.ContinuousConvMode = ENABLE;
hadc.Init.DiscontinuousConvMode = DISABLE;
hadc.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
hadc.Init.DMAContinuousRequests = ENABLE;
hadc.Init.Overrun = ADC_OVR_DATA_PRESERVED;
if (HAL_ADC_Init(&hadc) != HAL_OK)
{
Error_Handler();
}
/* ### - 2 - Start calibration ############################################ */
if (HAL_ADCEx_Calibration_Start(&hadc) != HAL_OK)
{
Error_Handler();
}
/**Configure for the selected ADC regular channel to be converted.
*/
sConfig.Channel = ADC_CHANNEL_6;
sConfig.Rank = ADC_RANK_CHANNEL_NUMBER;
sConfig.SamplingTime = ADC_SAMPLETIME_239CYCLES_5;
if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK)
{
Error_Handler();
}
sConfig.Channel = ADC_CHANNEL_7;
sConfig.Rank = ADC_RANK_CHANNEL_NUMBER;
sConfig.SamplingTime = ADC_SAMPLETIME_239CYCLES_5;
if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK)
{
Error_Handler();
}
/* ### - 4 - Start conversion in DMA mode ################################# */
if (HAL_ADC_Start(&hadc) != HAL_OK)
{
Error_Handler();
}
}
DMA初始化
static void MX_DMA_Init(void)
{
/* DMA controller clock enable */
__HAL_RCC_DMA1_CLK_ENABLE();
/* DMA interrupt init */
/* DMA1_Channel1_IRQn interrupt configuration */
HAL_NVIC_SetPriority(DMA1_Channel1_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(DMA1_Channel1_IRQn);
}
__IO uint32_t ADC_Value[2];
uint32_t ad0,ad1;
int main(void)
{
.....//此处省略一些
MX_ADC6_Init();
HAL_ADC_Start_DMA(&hadc, (uint32_t*)&ADC_Value, 2);
while(1)
{
HAL_Delay(500);
ad0 = ADC_Value[0];
ad1 = ADC_Value[1];
printf("\r\n******** ADC DMA Example ********\r\n\r\n");
printf(" AD0 value = %1.3fV \r\n", ad0*3.3f/4096);
printf(" AD1 value = %1.3fV \r\n", ad1*3.3f/4096);
}
}
输出结果：
******** ADC DMA Example ********
AD0 value = 0.000V
AD1 value = 0.000V
然而这两个引脚是都有电压的。求救呀？ |
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