各位有没有使用过F407内部的温度传感器,今天测试了下,室温在15度左右,采集内码值为1220,换算为温度为: T = (Vsense – V25)/AVG_Slope +25 = 114.16, V25 = 0.76V; AVG_Slope = 2.5mv/℃ 这太离谱了吧,不知道是哪里出了问题; 按照官方给的公式,要是温度在15~30摄氏度之间,转换内码值就需要在910~960之间才可以 求高手指点…代码如下: static void AdcPinComInit(void) { GPIO_InitTypeDef GPIO_InitStructure; ADC_CommonInitTypeDef ADC_InitStructure; RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1 | RCC_APB2Periph_ADC2, ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3 | GPIO_Pin_4; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_Init(GPIOA, &GPIO_InitStructure); ADC_InitStructure.ADC_Mode = ADC_DualMode_RegSimult; ADC_InitStructure.ADC_Prescaler = ADC_Prescaler_Div2; ADC_InitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_1; ADC_InitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_10Cycles; ADC_CommonInit(&ADC_InitStructure); } static void AdcDmaInit(void) { DMA_InitTypeDef DMA_InitStructure; RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE); DMA_InitStructure.DMA_Channel = DMA_Channel_0; DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)AdcSampDmaBuf; DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC_CCR_ADDRESS; DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory; DMA_InitStructure.DMA_BufferSize = ADC_DMA_BUF_LEN; 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_Enable; //// 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); } static void Adc1ChxConfig(void) { ADC_InitTypeDef ADC_InitStructure; ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b; ADC_InitStructure.ADC_ScanConvMode = ENABLE; 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 = 3; ADC_Init(ADC1, &ADC_InitStructure); //// ADC1 regular channels configuration ADC_RegularChannelConfig(ADC1, ADC_Channel_TempSensor, 1, ADC_SampleTime_15Cycles); ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 2, ADC_SampleTime_15Cycles); ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 3, ADC_SampleTime_15Cycles); } static void Adc2ChxConfig(void) { ADC_InitTypeDef ADC_InitStructure; ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b; ADC_InitStructure.ADC_ScanConvMode = ENABLE; 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 = 3; ADC_Init(ADC2, &ADC_InitStructure); //// ADC2 regular channels configuration ADC_RegularChannelConfig(ADC2, ADC_Channel_2, 1, ADC_SampleTime_15Cycles); ADC_RegularChannelConfig(ADC2, ADC_Channel_4, 2, ADC_SampleTime_15Cycles); ADC_RegularChannelConfig(ADC2, ADC_Channel_2, 3, ADC_SampleTime_15Cycles); } |
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参考了网上测教程,转换结果一样,另:硬件Vdda = 3.3V , Vref = 2V...
STM32F407内部温度传感器测量范围 –40 to 125 °C 精度: ±1.5 °C
你的参考电压如果选择2V,那你只能使用ADC的慢速模式,
如果全速模式,VREF要2.4V以上。
你说的慢速模式和快速模式在那个手册中有?
芯片温度很低的,不会有影响...
内部温度传感器用的人比较少应该,应该会用外部的。
在额定电压下的一个温度参考值,如果电压不额定,内部温度是不准的。
要求不高,只要个大致范围即可...
有可能,电压基准是用稳压二极管取得...
哦哦 。
18B20精度比较高...