H7 ADC3的温度传感器采集值转换后温度总是120多度
本帖最后由 fendoushuai 于 2024-3-28 18:10 编辑从H7的ADC3 19通道读取的温度值转换后总是120多度
是需要对它进行校准吗？还是有别的配置
printf打印的结果如下
TS_CAL1=12220, TS_CAL2=16301
ADC3_INP19 TEMP Value=17179, Voltage= 127.211 C,
static void AppTaskADC(void *p_arg)
{
float AdcValues;
uint16_t TS_CAL1;
uint16_t TS_CAL2;
(void)p_arg;
while(1) {
BSP_vToggleLED(LED_YELLOW);
TS_CAL1 = *(__IO uint16_t *)(0x1FF1E820);
TS_CAL2 = *(__IO uint16_t *)(0x1FF1E840);
AdcValues = (110.0 - 30.0) * ( aADC3ConvertedData - TS_CAL1) / (TS_CAL2 - TS_CAL1) + 30;
printf("TS_CAL1=%d, TS_CAL2=%d\r\n", TS_CAL1, TS_CAL2);
printf("ADC3_INP19 TEMP Value=%d, Voltage= %5.3f C,\r\n", aADC3ConvertedData, AdcValues);
OSTimeDlyHMSM(0, 0, 2, 0);
}
}
/* ### - 1 - Initialize ADC peripheral #################################### */
hadc3.Instance = ADC3;
if (HAL_ADC_DeInit(&hadc3) != HAL_OK) {
/* ADC de-initialization Error */
Error_Handler(__FILE__, __LINE__);
}
hadc3.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV1; /* Asynchronous clock mode, input ADC clock divided by 1*/
hadc3.Init.Resolution = ADC_RESOLUTION_16B; /* 16-bit resolution for converted data */
hadc3.Init.ScanConvMode = DISABLE; /* Sequencer disabled (ADC conversion on only 1 channel: channel set on rank 1) */
hadc3.Init.EOCSelection = ADC_EOC_SINGLE_CONV; /* EOC flag picked-up to indicate conversion end */
hadc3.Init.LowPowerAutoWait = DISABLE; /* Auto-delayed conversion feature disabled */
hadc3.Init.ContinuousConvMode = ENABLE; /* Continuous mode enabled (automatic conversion restart after each conversion) */
hadc3.Init.NbrOfConversion = 1; /* Parameter discarded because sequencer is disabled */
hadc3.Init.DiscontinuousConvMode = DISABLE; /* Parameter discarded because sequencer is disabled */
hadc3.Init.NbrOfDiscConversion = 1; /* Parameter discarded because sequencer is disabled */
hadc3.Init.ExternalTrigConv = ADC_SOFTWARE_START; /* Software start to trig the 1st conversion manually, without external event */
hadc3.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE; /* Parameter discarded because software trigger chosen */
hadc3.Init.ConversionDataManagement = ADC_CONVERSIONDATA_DMA_CIRCULAR; /* ADC DMA circular requested */
hadc3.Init.Overrun = ADC_OVR_DATA_OVERWRITTEN; /* DR register is overwritten with the last conversion result in case of overrun */
hadc3.Init.OversamplingMode = DISABLE; /* No oversampling */
/* Initialize ADC peripheral according to the passed parameters */
if (HAL_ADC_Init(&hadc3) != HAL_OK) {
Error_Handler(__FILE__, __LINE__);
}
/* ### - 2 - Start calibration ############################################ */
if (HAL_ADCEx_Calibration_Start(&hadc3, ADC_CALIB_OFFSET_LINEARITY, ADC_SINGLE_ENDED) != HAL_OK) {
Error_Handler(__FILE__, __LINE__);
}
/* ### - 3 - Channel configuration ######################################## */
sConfig.Channel = ADC_CHANNEL_TEMPSENSOR; /* Sampled channel number */
sConfig.Rank = ADC_REGULAR_RANK_1; /* Rank of sampled channel number ADCx_CHANNEL */
sConfig.SamplingTime = ADC_SAMPLETIME_810CYCLES_5; /* Sampling time (number of clock cycles unit) */
sConfig.SingleDiff = ADC_SINGLE_ENDED; /* Single-ended input channel */
sConfig.OffsetNumber = ADC_OFFSET_NONE; /* No offset subtraction */
sConfig.Offset = 0; /* Parameter discarded because offset correction is disabled */
if (HAL_ADC_ConfigChannel(&hadc3, &sConfig) != HAL_OK) {
Error_Handler(__FILE__, __LINE__);
}
注意基准电压的范围，官方给的公式的基准电压和你的基准电压是否一致？如果不一致要改变公式的！我之前测试温度一直是120度，怎么也查不到问题，后面是发现是基准电压问题 1、注意你的稳压基准，我们之前做的那个例子是3.3V稳压下测量的。
2、使用ADC功能，板子最好是外置电源供电。 板子电压参考电压是2.5V，调整了计算公式，使用HAL库中的函数__HAL_ADC_CALC_TEMPERATURE_TYP_PARAMS可以得到温度了 fendoushuai 发表于 2024-3-29 10:09
板子电压参考电压是2.5V，调整了计算公式，使用HAL库中的函数__HAL_ADC_CALC_TEMPERATURE_TYP_PARAMS可以得 ...
那确实方便了。
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