STM32L071RB ADC 多通道模式

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hellolinux-2302 发布时间：2018-10-20 20:56

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项目上要用到STM32L071 ,很简单的采集4个通道的ADC值。网上找了一下什么IT模式，DMA模式.....太多了，太麻烦。我们的应用很简单，就是每隔1秒采集一下ADC IN0，ADC IN1，内部参考电压，内部温度传感器4个通道。
首先是ADC初始化，用到了Vrefint，和内部温度传感器。

/* ADC init function */
void MX_ADC_Init(void)
{
ADC_ChannelConfTypeDef sConfig;
/**Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion)
*/
hadc.Instance = ADC1;
hadc.Init.OversamplingMode = DISABLE;
hadc.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV2;
hadc.Init.Resolution = ADC_RESOLUTION_12B;
hadc.Init.SamplingTime = ADC_SAMPLETIME_160CYCLES_5;
hadc.Init.ScanConvMode = ADC_SCAN_DIRECTION_FORWARD;
hadc.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc.Init.ContinuousConvMode = DISABLE;
hadc.Init.DiscontinuousConvMode = ENABLE;
hadc.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
hadc.Init.ExternalTrigConv = ADC_SOFTWARE_START;
hadc.Init.DMAContinuousRequests = DISABLE;
hadc.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
hadc.Init.Overrun = ADC_OVR_DATA_PRESERVED;
hadc.Init.LowPowerAutoWait = DISABLE;
hadc.Init.LowPowerFrequencyMode = DISABLE;
hadc.Init.LowPowerAutoPowerOff = DISABLE;
if (HAL_ADC_Init(&hadc) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}
/* 校正ADC */
if(HAL_ADCEx_Calibration_Start(&hadc, ADC_SINGLE_ENDED) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}
/**Configure for the selected ADC regular channel 0 to be converted.*/
sConfig.Channel = ADC_CHANNEL_0;
sConfig.Rank = ADC_RANK_CHANNEL_NUMBER;
if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}
/**Configure for the selected ADC regular channel 1 to be converted.*/
sConfig.Channel = ADC_CHANNEL_1;
if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}
/**Configure for the selected ADC regular channel 17 to be converted.*/
sConfig.Channel = ADC_CHANNEL_VREFINT;
if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}
/**Configure for the selected ADC regular channel 18 to be converted.*/
sConfig.Channel = ADC_CHANNEL_TEMPSENSOR;
if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}
HAL_ADCEx_EnableVREFINT();
HAL_ADCEx_EnableVREFINTTempSensor();
}

复制代码

ADC采样函数

/* Private functions ---------------------------------------------------------*/
#define RES1 10000 //分压电阻R1，10K
#define RES2 10000 //分压电阻R2，10K
#define PRATIO (RES1+RES2)/(RES2)
#define ADC_12BIT 4095.0
#define ADC_REF 3.3
#define VOL_RADIO ADC_REF/ADC_12BIT //无电阻分压模式系数
#define BAT_RADIO (ADC_REF*PRATIO)/ADC_12BIT //电阻分压模式系数
//温度校正
#define TEMP130_CAL_ADDR ((uint16_t*) ((uint32_t) 0x1FF8007E))
#define TEMP30_CAL_ADDR ((uint16_t*) ((uint32_t) 0x1FF8007A))
#define VDD_CALIB ((uint16_t) (300))
#define VDD_APPLI ((uint16_t) (330))
/*******************************************************************************
* Function Name : ComputeTemperature
* Description : Compute STM32 Temperature
* Input : None
* Output : None
* Return : None
*******************************************************************************/
int32_t ComputeTemperature(uint32_t measure)
{
int32_t temperature;
temperature = ((measure * VDD_APPLI / VDD_CALIB)- (int32_t) *TEMP30_CAL_ADDR );
temperature = temperature * (int32_t)(130 - 30);
temperature = temperature / (int32_t)(*TEMP130_CAL_ADDR - *TEMP30_CAL_ADDR);
temperature = temperature + 30;
return(temperature);
}
/*******************************************************************************
* Function Name : Get_Adc
* Description : get voltage
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void Get_Adc(void)
{
u32 adc_value;
adc_value = 0;
/*Start the conversion process*/
if (HAL_ADC_Start(&hadc) != HAL_OK)
{
/* Start Conversation Error */
Error_Handler();
}
HAL_ADC_PollForConversion(&hadc, 50);
/* Check if the continous conversion of regular channel is finished */
if ((HAL_ADC_GetState(&hadc) & HAL_ADC_STATE_REG_EOC) == HAL_ADC_STATE_REG_EOC)
{
/*Get the converted value of regular channel */
adc_value = HAL_ADC_GetValue(&hadc);
}
printf("DEBUG: ADC CHANNEL 0 = %fV\r\n", BAT_RADIO*adc_value); //ADC 通道0 用10K,10K电阻分压
/*Start the conversion process*/
if (HAL_ADC_Start(&hadc) != HAL_OK)
{
/* Start Conversation Error */
Error_Handler();
}
HAL_ADC_PollForConversion(&hadc, 50);
/* Check if the continous conversion of regular channel is finished */
if ((HAL_ADC_GetState(&hadc) & HAL_ADC_STATE_REG_EOC) == HAL_ADC_STATE_REG_EOC)
{
/*Get the converted value of regular channel */
adc_value = HAL_ADC_GetValue(&hadc);
}
printf("DEBUG: ADC CHANNEL 1 = %fV\r\n", VOL_RADIO*adc_value); //ADC 通道1 没用电阻分压
/*Start the conversion process*/
if (HAL_ADC_Start(&hadc) != HAL_OK)
{
/* Start Conversation Error */
Error_Handler();
}
HAL_ADC_PollForConversion(&hadc, 50);
/* Check if the continous conversion of regular channel is finished */
if ((HAL_ADC_GetState(&hadc) & HAL_ADC_STATE_REG_EOC) == HAL_ADC_STATE_REG_EOC)
{
/*Get the converted value of regular channel */
adc_value = HAL_ADC_GetValue(&hadc);
}
printf("DEBUG: ADC CHANNEL 17 = %fV\r\n", VOL_RADIO*adc_value); //内部Vref = 1.2V
/*Start the conversion process*/
if (HAL_ADC_Start(&hadc) != HAL_OK)
{
/* Start Conversation Error */
Error_Handler();
}
HAL_ADC_PollForConversion(&hadc, 50);
/* Check if the continous conversion of regular channel is finished */
if ((HAL_ADC_GetState(&hadc) & HAL_ADC_STATE_REG_EOC) == HAL_ADC_STATE_REG_EOC)
{
/*Get the converted value of regular channel */
adc_value = HAL_ADC_GetValue(&hadc);
}
printf("DEBUG: ADC CHANNEL 18 = %d℃\r\n", ComputeTemperature(adc_value)); //内部温度传感器
HAL_ADC_Stop(&hadc);
}