本帖最后由 YangTwo 于 2024-11-9 17:33 编辑
ADC简介
STM32WB09系列的ADC有16中工作模式组合：
• External signals through ADC_VINPx and ADC_VINMx, where x=0,1,2 or 3
– Up to 4 differential inputs
– Up to 8 single-ended inputs one single ended input to interface with a temperature sensor in a range up to 1.2 V
• one single ended input connected to VBAT for battery level detector in a range up to 3.6 V
• two single ended inputs connected to GND for calibration
• two single ended inputs connected to 1.2 V for calibration
• one single ended input connected to Temperature Sensor
本次体验自带的温度传感器与一路外部模拟输入模式。其中外部输入采集到是DFROBOT的模拟声音传感器。
模拟声音传感器简介MIC声音传感器是一款基于麦克风为声音检测的传感器，可用来对周围环境中的声音强度进行检测，具有300倍的放大器，输出模拟信号能使用3.3V和5V为基准AD采集，可以用来实现根据声音大小进行互动的效果、制作声控机器人、声控开关、声控报警等。 产品参数引脚说明
传感器电路图：
与STM32WB09连接实物图：
在CubeMX里面配置ADC参数与DMA传输。
本次不少STM32的芯片都自带了可以测量芯片内部结温的温度传感器，精度不是很高，通常±5V的误差都是标配。
自动生成代码，查看ADC初始化：
static void MX_ADC1_Init(void)
{
/* USER CODE BEGIN ADC1_Init 0 */
/* USER CODE END ADC1_Init 0 */
ADC_ChannelConfTypeDef ConfigChannel = {0};
/* USER CODE BEGIN ADC1_Init 1 */
/* USER CODE END ADC1_Init 1 */
/** Common config
*/
hadc1.Instance = ADC1;
hadc1.Init.ConversionType = ADC_CONVERSION_WITH_DS;
hadc1.Init.SequenceLength = 2;
hadc1.Init.SamplingMode = ADC_SAMPLING_AT_START;
hadc1.Init.SampleRate = ADC_SAMPLE_RATE_16;
hadc1.Init.InvertOutputMode = ADC_DATA_INVERT_NONE;
hadc1.Init.Overrun = ADC_NEW_DATA_IS_LOST;
hadc1.Init.ContinuousConvMode = DISABLE;
hadc1.Init.DownSamplerConfig.DataWidth = ADC_DS_DATA_WIDTH_12_BIT;
hadc1.Init.DownSamplerConfig.DataRatio = ADC_DS_RATIO_1;
if (HAL_ADC_Init(&hadc1) != HAL_OK)
{
Error_Handler();
}
/** Configure Regular Channel
*/
ConfigChannel.Channel = ADC_CHANNEL_TEMPSENSOR;
ConfigChannel.Rank = ADC_RANK_1;
ConfigChannel.VoltRange = ADC_VIN_RANGE_1V2;
ConfigChannel.CalibrationPoint.Number = ADC_CALIB_POINT_1;
ConfigChannel.CalibrationPoint.Gain = 0x0;
ConfigChannel.CalibrationPoint.Offset = 0x0;
if (HAL_ADC_ConfigChannel(&hadc1, &ConfigChannel) != HAL_OK)
{
Error_Handler();
}
/** Configure Regular Channel
*/
ConfigChannel.Channel = ADC_CHANNEL_VINP0;
ConfigChannel.Rank = ADC_RANK_2;
ConfigChannel.CalibrationPoint.Number = ADC_CALIB_NONE;
ConfigChannel.CalibrationPoint.Gain = 0x00;
ConfigChannel.CalibrationPoint.Offset = 0x00;
if (HAL_ADC_ConfigChannel(&hadc1, &ConfigChannel) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN ADC1_Init 2 */
/* USER CODE END ADC1_Init 2 */
}
主函数：
int main(void)
{
/* USER CODE BEGIN 1 */
uint32_t tmp_index;
/* Initialize ADC group regular data buffer values */
for (tmp_index = 0; tmp_index < ADC_CONVERTED_DATA_BUFFER_SIZE; tmp_index++)
{
uhADCxConvertedData[tmp_index] = VAR_CONVERTED_DATA_INIT_VALUE;
}
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* Configure the peripherals common clocks */
PeriphCommonClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_DMA_Init();
MX_ADC1_Init();
MX_USART1_UART_Init();
/* USER CODE BEGIN 2 */
/* Initialize LED on board */
BSP_LED_Init(LD1);
/* Start ADC group regular conversion */
/* Note: First start with DMA transfer initialization, following ones
with basic ADC start. */
if (HAL_ADC_Start_DMA(&hadc1,
(uint32_t *)uhADCxConvertedData,
ADC_CONVERTED_DATA_BUFFER_SIZE
) != HAL_OK)
{
/* Error: ADC conversion start could not be performed */
Error_Handler();
}
/* Toggle LED at each ADC conversion */
BSP_LED_On(LD1);
HAL_Delay(LED_BLINK_SLOW);
BSP_LED_Off(LD1);
HAL_Delay(LED_BLINK_SLOW);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* Start ADC group regular conversion */
if (HAL_ADC_Start(&hadc1) != HAL_OK)
{
/* Error: ADC conversion start could not be performed */
Error_Handler();
}
/* Toggle LED at each ADC conversion */
BSP_LED_On(LD1);
HAL_Delay(LED_BLINK_SLOW);
BSP_LED_Off(LD1);
HAL_Delay(LED_BLINK_SLOW);
/* Note: ADC group regular conversions data are stored into array */
/* "uhADCxConvertedData" */
/* (for debug: see variable content into watch window). */
/* - uhADCxConvertedData[0]: ADC channel set on sequence rank 1 */
/* (ADC1 internal channel temper. sensor) */
/* - uhADCxConvertedData[1]: ADC channel set on sequence rank 2 */
/* (ADC1 channel 4)) */
/* If ADC conversions and DMA transfer are completed, then process data */
if(ubDmaTransferStatus == 1)
{
/* Computation of ADC conversions raw data to physical values */
/* using LL ADC driver helper macro. */
uhADCxConvertedData_VoltageGPIO_mVolt = __LL_ADC_CALC_DATA_TO_VOLTAGE(LL_ADC_VIN_RANGE_3V6, uhADCxConvertedData[1], LL_ADC_DS_DATA_WIDTH_12_BIT);
hADCxConvertedData_Temperature_DegreeCelsius = __LL_ADC_CALC_TEMPERATURE( uhADCxConvertedData[0], LL_ADC_DS_DATA_WIDTH_12_BIT);
printf("\r\n Internal Temp Sensor: %d Celsius", hADCxConvertedData_Temperature_DegreeCelsius);
printf("\r\n External Voice Sensor: %d mVolt", uhADCxConvertedData_VoltageGPIO_mVolt);
/* Update status variable of DMA transfer */
ubDmaTransferStatus = 0;
/* Toggle LED 4 times */
tmp_index = 4*2;
while(tmp_index != 0)
{
BSP_LED_Toggle(LD1);
HAL_Delay(LED_BLINK_FAST);
tmp_index--;
}
HAL_Delay(500); /* Delay to highlight toggle sequence */
}
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
串口输出：
在有音乐播放的时候，采集到的电压值会变化：
不过总感觉内部温度传感器采集到温度才2℃，有点不太符合通常25°左右的测量值，目前正常排查潜在的配置问题。
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