[问答]

STM32F405 ADC内部上拉的问题求解

问答对人有帮助，内容完整，我也想知道答案 0 我正在使用带有 DMA（循环）的三重同时转换 ADC（每个 2 次转换）： static void MX_ADC1_Init(void) { ADC_MultiModeTypeDef multimode = {0}; ADC_ChannelConfTypeDef sConfig = {0}; /** Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion) / hadc1.Instance = ADC1; hadc1.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4; hadc1.Init.Resolution = ADC_RESOLUTION_12B; hadc1.Init.ScanConvMode = ENABLE; hadc1.Init.ContinuousConvMode = DISABLE; hadc1.Init.DiscontinuousConvMode = DISABLE; hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_RISING; hadc1.Init.ExternalTrigConv = ADC_EXTERNALTRIGCONV_T8_TRGO; hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT; hadc1.Init.NbrOfConversion = 2; hadc1.Init.DMAContinuousRequests = ENABLE; hadc1.Init.EOCSelection = ADC_EOC_SEQ_CONV; if (HAL_ADC_Init(&hadc1) != HAL_OK) { Error_Handler(); } /* Configure the ADC multi-mode / multimode.Mode = ADC_TRIPLEMODE_REGSIMULT; multimode.DMAAccessMode = ADC_DMAACCESSMODE_1; multimode.TwoSamplingDelay = ADC_TWOSAMPLINGDELAY_5CYCLES; if (HAL_ADCEx_MultiModeConfigChannel(&hadc1, &multimode) != HAL_OK) { Error_Handler(); } /* Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time. / sConfig.Channel = ADC_CHANNEL_12; sConfig.Rank = 1; sConfig.SamplingTime = ADC_SAMPLETIME_28CYCLES; if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) { Error_Handler(); } /* Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time. / sConfig.Channel = ADC_CHANNEL_7; sConfig.Rank = 2; if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) { Error_Handler(); } } /* * @brief ADC2 Initialization Function * @param None * @retval None / static void MX_ADC2_Init(void) { ADC_ChannelConfTypeDef sConfig = {0}; /* Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion) / hadc2.Instance = ADC2; hadc2.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4; hadc2.Init.Resolution = ADC_RESOLUTION_12B; hadc2.Init.ScanConvMode = ENABLE; hadc2.Init.ContinuousConvMode = DISABLE; hadc2.Init.DiscontinuousConvMode = DISABLE; hadc2.Init.DataAlign = ADC_DATAALIGN_RIGHT; hadc2.Init.NbrOfConversion = 2; hadc2.Init.DMAContinuousRequests = DISABLE; hadc2.Init.EOCSelection = ADC_EOC_SEQ_CONV; if (HAL_ADC_Init(&hadc2) != HAL_OK) { Error_Handler(); } /* Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time. / sConfig.Channel = ADC_CHANNEL_11; sConfig.Rank = 1; sConfig.SamplingTime = ADC_SAMPLETIME_28CYCLES; if (HAL_ADC_ConfigChannel(&hadc2, &sConfig) != HAL_OK) { Error_Handler(); } /* Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time. / sConfig.Channel = ADC_CHANNEL_14; sConfig.Rank = 2; if (HAL_ADC_ConfigChannel(&hadc2, &sConfig) != HAL_OK) { Error_Handler(); } } /* * @brief ADC3 Initialization Function * @param None * @retval None / static void MX_ADC3_Init(void) { ADC_ChannelConfTypeDef sConfig = {0}; /* Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion) / hadc3.Instance = ADC3; hadc3.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4; hadc3.Init.Resolution = ADC_RESOLUTION_12B; hadc3.Init.ScanConvMode = ENABLE; hadc3.Init.ContinuousConvMode = DISABLE; hadc3.Init.DiscontinuousConvMode = DISABLE; hadc3.Init.DataAlign = ADC_DATAALIGN_RIGHT; hadc3.Init.NbrOfConversion = 2; hadc3.Init.DMAContinuousRequests = DISABLE; hadc3.Init.EOCSelection = ADC_EOC_SEQ_CONV; if (HAL_ADC_Init(&hadc3) != HAL_OK) { Error_Handler(); } /* Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time. / sConfig.Channel = ADC_CHANNEL_10; sConfig.Rank = 1; sConfig.SamplingTime = ADC_SAMPLETIME_28CYCLES; if (HAL_ADC_ConfigChannel(&hadc3, &sConfig) != HAL_OK) { Error_Handler(); } /* Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time. */ sConfig.Channel = ADC_CHANNEL_13; sConfig.Rank = 2; if (HAL_ADC_ConfigChannel(&hadc3, &sConfig) != HAL_OK) { Error_Handler(); } } 我的问题是 ADC3 (PC3) 的通道 13 - 它正在测量一个简单的分压器：即使在移除 R2 和 C2 之后，万用表和 ADC 都显示在 3.2V 左右（似乎内部上拉）。例如，当我将引脚模式更改为 AF_OD 或 OUTPUT_OD 时，电压为 0.6-0.8V。但是，如果我切换回模拟，无论如何电压都会升至 3.2。我在 C2 的位置焊接了 6k8 电阻以产生更强的下拉，但这并没有改变任何事情...... 关于可能是什么问题的任何想法？ 0
2022-12-6 06:39:58　　评论淘帖0 邀请回答您可以邀请以下用户，快速回答问题 × wang21cj 该类别下有 44 个回答。邀请回答新星之火12138 该类别下有 41 个回答。邀请回答 chm5 该类别下有 39 个回答。邀请回答 hgimtk 该类别下有 33 个回答。邀请回答 HengDu 该类别下有 30 个回答。邀请回答 hwp0415229 该类别下有 28 个回答。邀请回答 jghgfdssas 该类别下有 28 个回答。邀请回答 kingnet6688 该类别下有 26 个回答。邀请回答颜刚YanG 该类别下有 26 个回答。邀请回答可口可甜该类别下有 26 个回答。邀请回答柱子图宁该类别下有 25 个回答。邀请回答 jenny042 该类别下有 25 个回答。邀请回答 kingnet9999 该类别下有 25 个回答。邀请回答 andyfly7 该类别下有 25 个回答。邀请回答麻酱该类别下有 25 个回答。邀请回答 zyh34997 该类别下有 25 个回答。邀请回答哼小曲该类别下有 24 个回答。邀请回答云汉007 该类别下有 24 个回答。邀请回答 ggfvxv 该类别下有 24 个回答。邀请回答 heks 该类别下有 24 个回答。邀请回答举报石利军相关推荐 • STM32F405与STM32F401两个IC的SPI模块有什么区别吗？ 493 • 怎样使用gsm模块更新stm32f405的固件呢 249 • STM32F405测电阻分压不准确 3068 • 项目从STM32F413切换到STM32F405发生硬故障求解？ 329 • 请教坛内高手STM32F405的程序烧到F411上没用，该怎么改一下？ 4608 • 有没有厂家能做基于STM32F405的电压信号采集模块 2805 • STM32F405如何设置可以让低功耗电流在1.1ma 724 • 求助，请问使用STM32单片机需要用USB VCP上拉D+/D-吗？ 257 • 有关STM32F405板串口调试的一点经验分享 1745 • 为什么STM32F405的引脚中断只能同时使用一个呢 922 1个回答

答案对人有帮助，有参考价值 0 也许芯片有问题，由于这个引脚上的静电放电......？（短路保护二极管）你能试试另一个芯片吗？或使用其他尚未损坏的输入通道/引脚进行测试？

2022-12-6 10:58:08 评论举报刘颖