171 lines
6.1 KiB
C
171 lines
6.1 KiB
C
//ADC 库
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#include "sys.h"
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#include "tim.h"
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#include "adc.h"
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//32 字节对齐
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ALIGN_32BYTES(uint16_t __attribute__((section(".RAM_D3"))) ADCxValues[2]);
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/**
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* @brief ADC 初始化函数
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*/
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void ADC_Init(void)
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{
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ADC_HandleTypeDef AdcHandle = {0};
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DMA_HandleTypeDef DMA_Handle = {0};
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ADC_ChannelConfTypeDef sConfig = {0};
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GPIO_InitTypeDef GPIO_InitStruct;
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//配置时钟
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RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0};
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PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_ADC;
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PeriphClkInitStruct.PLL2.PLL2M = 25;
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PeriphClkInitStruct.PLL2.PLL2N = 504;
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PeriphClkInitStruct.PLL2.PLL2P = 7;
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PeriphClkInitStruct.PLL2.PLL2Q = 7;
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PeriphClkInitStruct.PLL2.PLL2R = 7;
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PeriphClkInitStruct.PLL2.PLL2RGE = RCC_PLL2VCIRANGE_0;
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PeriphClkInitStruct.PLL2.PLL2VCOSEL = RCC_PLL2VCOWIDE;
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PeriphClkInitStruct.PLL2.PLL2FRACN = 0;
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PeriphClkInitStruct.AdcClockSelection = RCC_ADCCLKSOURCE_PLL2;
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if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK)
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{
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Error_Handler(__FILE__, __LINE__);
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}
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//GPIO
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__HAL_RCC_GPIOC_CLK_ENABLE();
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GPIO_InitStruct.Pin = GPIO_PIN_0 | GPIO_PIN_1;
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GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
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GPIO_InitStruct.Pull = GPIO_NOPULL;
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HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
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//DMA
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__HAL_RCC_DMA1_CLK_ENABLE();
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DMA_Handle.Instance = DMA1_Stream1; //使用的DMA1 Stream1
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DMA_Handle.Init.Request = DMA_REQUEST_ADC3; //请求类型采用 DMA_REQUEST_ADC3
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DMA_Handle.Init.Direction = DMA_PERIPH_TO_MEMORY; //传输方向是从存储器到外设
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DMA_Handle.Init.PeriphInc = DMA_PINC_DISABLE; //外设地址自增禁止
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DMA_Handle.Init.MemInc = DMA_MINC_ENABLE; //存储器地址自增使能
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DMA_Handle.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD; //外设数据传输位宽选择半字，即 16bit
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DMA_Handle.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD; //存储器数据传输位宽选择半字，即 16bit
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DMA_Handle.Init.Mode = DMA_CIRCULAR; //循环模式
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DMA_Handle.Init.Priority = DMA_PRIORITY_LOW; //优先级低
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DMA_Handle.Init.FIFOMode = DMA_FIFOMODE_DISABLE; //禁止 FIFO
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DMA_Handle.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_FULL;
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DMA_Handle.Init.MemBurst = DMA_MBURST_SINGLE;
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DMA_Handle.Init.PeriphBurst = DMA_PBURST_SINGLE;
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if (HAL_DMA_Init(&DMA_Handle) != HAL_OK)
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{
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Error_Handler(__FILE__, __LINE__);
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}
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//关联 ADC 句柄和 DMA 句柄
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__HAL_LINKDMA(&AdcHandle, DMA_Handle, DMA_Handle);
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//配置 ADC
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__HAL_RCC_ADC3_CLK_ENABLE();
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AdcHandle.Instance = ADC3;
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AdcHandle.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV8; //采用PLL异步时钟，8分频，即 72MHz / 8 = 36MHz
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AdcHandle.Init.Resolution = ADC_RESOLUTION_16B; //16 位分辨率
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AdcHandle.Init.ScanConvMode = ADC_SCAN_ENABLE; //开启扫描
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AdcHandle.Init.EOCSelection = ADC_EOC_SINGLE_CONV; //EOC 转换结束标志
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AdcHandle.Init.LowPowerAutoWait = DISABLE; //禁止低功耗自动延迟特性
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AdcHandle.Init.ContinuousConvMode = ENABLE; //启用自动转换
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AdcHandle.Init.NbrOfConversion = 2; //使用了 2 个转换通道
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AdcHandle.Init.DiscontinuousConvMode = DISABLE; //禁止不连续模式
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AdcHandle.Init.NbrOfDiscConversion = 1; //禁止不连续模式后，此参数忽略，此位是用来配置不连续子组中通道数
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AdcHandle.Init.ExternalTrigConv = ADC_SOFTWARE_START; //采用软件触发
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AdcHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_RISING; //采用软件触发的话，此位忽略
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AdcHandle.Init.ConversionDataManagement = ADC_CONVERSIONDATA_DMA_CIRCULAR; //DMA 循环模式接收 ADC 转换的数据
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AdcHandle.Init.Overrun = ADC_OVR_DATA_OVERWRITTEN; //ADC 转换溢出的话，覆盖 ADC 的数据寄存器
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AdcHandle.Init.OversamplingMode = DISABLE; //禁止过采样
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//初始化 ADC
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if (HAL_ADC_Init(&AdcHandle) != HAL_OK)
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{
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Error_Handler(__FILE__, __LINE__);
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}
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//校准 ADC，采用偏移校准
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if (HAL_ADCEx_Calibration_Start(&AdcHandle, ADC_CALIB_OFFSET, ADC_SINGLE_ENDED) != HAL_OK)
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{
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Error_Handler(__FILE__, __LINE__);
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}
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//序列 1，采样 PC0 引脚
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sConfig.Channel = ADC_CHANNEL_10;
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sConfig.Rank = ADC_REGULAR_RANK_1;
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sConfig.SamplingTime = ADC_SAMPLETIME_810CYCLES_5; //采样周期
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sConfig.SingleDiff = ADC_SINGLE_ENDED; //单端输入
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sConfig.OffsetNumber = ADC_OFFSET_NONE; //无偏移
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sConfig.Offset = 0;
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sConfig.OffsetRightShift = DISABLE; //禁止右移
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sConfig.OffsetSignedSaturation = DISABLE; //禁止有符号饱和
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if (HAL_ADC_ConfigChannel(&AdcHandle, &sConfig) != HAL_OK)
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{
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Error_Handler(__FILE__, __LINE__);
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}
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//序列 2，采样 PC1 引脚
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sConfig.Channel = ADC_CHANNEL_11;
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sConfig.Rank = ADC_REGULAR_RANK_2;
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sConfig.SamplingTime = ADC_SAMPLETIME_810CYCLES_5;
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sConfig.SingleDiff = ADC_SINGLE_ENDED;
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sConfig.OffsetNumber = ADC_OFFSET_NONE;
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sConfig.Offset = 0;
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sConfig.OffsetRightShift = DISABLE;
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sConfig.OffsetSignedSaturation = DISABLE;
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if (HAL_ADC_ConfigChannel(&AdcHandle, &sConfig) != HAL_OK)
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{
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Error_Handler(__FILE__, __LINE__);
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}
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//启动 ADC 的 DMA 方式传输
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if (HAL_ADC_Start_DMA(&AdcHandle, (uint32_t *)ADCxValues, 2) != HAL_OK)
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{
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Error_Handler(__FILE__, __LINE__);
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}
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//设置定时器
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TIM_Set(TIM3, 1000, 0, 0);
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}
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/**
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* @brief 获取 PC0 电压
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* @retval 电压，单位 V
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*/
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float ADC_Get_PC0(void)
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{
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return ADCxValues[0] * 3.3 / 65536;
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}
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/**
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* @brief 获取 PC1 电压
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* @retval 电压，单位 V
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*/
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float ADC_Get_PC1(void)
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{
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return ADCxValues[1] * 3.3 / 65536;
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}
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/**
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* @brief TIM3 中断处理
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*/
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void TIM3_IRQHandler(void)
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{
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if ((TIM3->SR & TIM_FLAG_UPDATE) != RESET)
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{
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//清除更新标志
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TIM3->SR = ~TIM_FLAG_UPDATE;
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SCB_InvalidateDCache_by_Addr((uint32_t *)ADCxValues, sizeof(uint32_t));
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}
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}
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