【STM32】DAC相关函数和类型

00. 目录

文章目录

00. 目录
01. DAC简介
02. 相关类型
03. 相关函数
04. 结构体封装
05. 预留
06. 附录
07. 声明

01. DAC简介

STM32F4的DAC模块(数字/模拟转换模块)是12位数字输入，电压输出型的DAC。DAC可以配置为 8 位或 12 位模式，也可以与 DMA 控制器配合使用。DAC 工作在 12 位模式时，数据可以设置成左对齐或右对齐。DAC 模块有 2 个输出通道，每个通道都有单独的转换器。在双 DAC 模式下，2 个通道可以独立地进行转换，也可以同时进行转换并同步地更新 2 个通道的输出。DAC 可以通过引脚输入参考电压 Vref+（通 ADC 共用）以获得更精确的转换结果。
STM32F4 的 DAC 模块主要特点有：
① 2 个 DAC 转换器：每个转换器对应 1 个输出通道
② 8 位或者 12 位单调输出
③ 12 位模式下数据左对齐或者右对齐
④ 同步更新功能
⑤ 噪声波形生成
⑥ 三角波形生成
⑦ 双 DAC 通道同时或者分别转换
⑧ 每个通道都有 DMA 功能

02. 相关类型

DAC Init structure

/** * @brief  DAC Init structure definition*/typedef struct
{uint32_t DAC_Trigger;                      /*!< Specifies the external trigger for the selected DAC channel.This parameter can be a value of @ref DAC_trigger_selection */uint32_t DAC_WaveGeneration;               /*!< Specifies whether DAC channel noise waves or triangle wavesare generated, or whether no wave is generated.This parameter can be a value of @ref DAC_wave_generation */uint32_t DAC_LFSRUnmask_TriangleAmplitude; /*!< Specifies the LFSR mask for noise wave generation orthe maximum amplitude triangle generation for the DAC channel. This parameter can be a value of @ref DAC_lfsrunmask_triangleamplitude */uint32_t DAC_OutputBuffer;                 /*!< Specifies whether the DAC channel output buffer is enabled or disabled.This parameter can be a value of @ref DAC_output_buffer */
}DAC_InitTypeDef;

DAC_trigger_selection

/** @defgroup DAC_trigger_selection * @{*/#define DAC_Trigger_None                   ((uint32_t)0x00000000) /*!< Conversion is automatic once the DAC1_DHRxxxx register has been loaded, and not by external trigger */
#define DAC_Trigger_T2_TRGO                ((uint32_t)0x00000024) /*!< TIM2 TRGO selected as external conversion trigger for DAC channel */
#define DAC_Trigger_T4_TRGO                ((uint32_t)0x0000002C) /*!< TIM4 TRGO selected as external conversion trigger for DAC channel */
#define DAC_Trigger_T5_TRGO                ((uint32_t)0x0000001C) /*!< TIM5 TRGO selected as external conversion trigger for DAC channel */
#define DAC_Trigger_T6_TRGO                ((uint32_t)0x00000004) /*!< TIM6 TRGO selected as external conversion trigger for DAC channel */
#define DAC_Trigger_T7_TRGO                ((uint32_t)0x00000014) /*!< TIM7 TRGO selected as external conversion trigger for DAC channel */
#define DAC_Trigger_T8_TRGO                ((uint32_t)0x0000000C) /*!< TIM8 TRGO selected as external conversion trigger for DAC channel */                                                                       #define DAC_Trigger_Ext_IT9                ((uint32_t)0x00000034) /*!< EXTI Line9 event selected as external conversion trigger for DAC channel */
#define DAC_Trigger_Software               ((uint32_t)0x0000003C) /*!< Conversion started by software trigger for DAC channel */#define IS_DAC_TRIGGER(TRIGGER) (((TRIGGER) == DAC_Trigger_None) || \((TRIGGER) == DAC_Trigger_T6_TRGO) || \((TRIGGER) == DAC_Trigger_T8_TRGO) || \((TRIGGER) == DAC_Trigger_T7_TRGO) || \((TRIGGER) == DAC_Trigger_T5_TRGO) || \((TRIGGER) == DAC_Trigger_T2_TRGO) || \((TRIGGER) == DAC_Trigger_T4_TRGO) || \((TRIGGER) == DAC_Trigger_Ext_IT9) || \((TRIGGER) == DAC_Trigger_Software))

DAC_wave_generation

/** @defgroup DAC_wave_generation * @{*/#define DAC_WaveGeneration_None            ((uint32_t)0x00000000)
#define DAC_WaveGeneration_Noise           ((uint32_t)0x00000040)
#define DAC_WaveGeneration_Triangle        ((uint32_t)0x00000080)
#define IS_DAC_GENERATE_WAVE(WAVE) (((WAVE) == DAC_WaveGeneration_None) || \((WAVE) == DAC_WaveGeneration_Noise) || \((WAVE) == DAC_WaveGeneration_Triangle))

DAC_lfsrunmask_triangleamplitude


/** @defgroup DAC_lfsrunmask_triangleamplitude* @{*/#define DAC_LFSRUnmask_Bit0                ((uint32_t)0x00000000) /*!< Unmask DAC channel LFSR bit0 for noise wave generation */
#define DAC_LFSRUnmask_Bits1_0             ((uint32_t)0x00000100) /*!< Unmask DAC channel LFSR bit[1:0] for noise wave generation */
#define DAC_LFSRUnmask_Bits2_0             ((uint32_t)0x00000200) /*!< Unmask DAC channel LFSR bit[2:0] for noise wave generation */
#define DAC_LFSRUnmask_Bits3_0             ((uint32_t)0x00000300) /*!< Unmask DAC channel LFSR bit[3:0] for noise wave generation */
#define DAC_LFSRUnmask_Bits4_0             ((uint32_t)0x00000400) /*!< Unmask DAC channel LFSR bit[4:0] for noise wave generation */
#define DAC_LFSRUnmask_Bits5_0             ((uint32_t)0x00000500) /*!< Unmask DAC channel LFSR bit[5:0] for noise wave generation */
#define DAC_LFSRUnmask_Bits6_0             ((uint32_t)0x00000600) /*!< Unmask DAC channel LFSR bit[6:0] for noise wave generation */
#define DAC_LFSRUnmask_Bits7_0             ((uint32_t)0x00000700) /*!< Unmask DAC channel LFSR bit[7:0] for noise wave generation */
#define DAC_LFSRUnmask_Bits8_0             ((uint32_t)0x00000800) /*!< Unmask DAC channel LFSR bit[8:0] for noise wave generation */
#define DAC_LFSRUnmask_Bits9_0             ((uint32_t)0x00000900) /*!< Unmask DAC channel LFSR bit[9:0] for noise wave generation */
#define DAC_LFSRUnmask_Bits10_0            ((uint32_t)0x00000A00) /*!< Unmask DAC channel LFSR bit[10:0] for noise wave generation */
#define DAC_LFSRUnmask_Bits11_0            ((uint32_t)0x00000B00) /*!< Unmask DAC channel LFSR bit[11:0] for noise wave generation */
#define DAC_TriangleAmplitude_1            ((uint32_t)0x00000000) /*!< Select max triangle amplitude of 1 */
#define DAC_TriangleAmplitude_3            ((uint32_t)0x00000100) /*!< Select max triangle amplitude of 3 */
#define DAC_TriangleAmplitude_7            ((uint32_t)0x00000200) /*!< Select max triangle amplitude of 7 */
#define DAC_TriangleAmplitude_15           ((uint32_t)0x00000300) /*!< Select max triangle amplitude of 15 */
#define DAC_TriangleAmplitude_31           ((uint32_t)0x00000400) /*!< Select max triangle amplitude of 31 */
#define DAC_TriangleAmplitude_63           ((uint32_t)0x00000500) /*!< Select max triangle amplitude of 63 */
#define DAC_TriangleAmplitude_127          ((uint32_t)0x00000600) /*!< Select max triangle amplitude of 127 */
#define DAC_TriangleAmplitude_255          ((uint32_t)0x00000700) /*!< Select max triangle amplitude of 255 */
#define DAC_TriangleAmplitude_511          ((uint32_t)0x00000800) /*!< Select max triangle amplitude of 511 */
#define DAC_TriangleAmplitude_1023         ((uint32_t)0x00000900) /*!< Select max triangle amplitude of 1023 */
#define DAC_TriangleAmplitude_2047         ((uint32_t)0x00000A00) /*!< Select max triangle amplitude of 2047 */
#define DAC_TriangleAmplitude_4095         ((uint32_t)0x00000B00) /*!< Select max triangle amplitude of 4095 */#define IS_DAC_LFSR_UNMASK_TRIANGLE_AMPLITUDE(VALUE) (((VALUE) == DAC_LFSRUnmask_Bit0) || \((VALUE) == DAC_LFSRUnmask_Bits1_0) || \((VALUE) == DAC_LFSRUnmask_Bits2_0) || \((VALUE) == DAC_LFSRUnmask_Bits3_0) || \((VALUE) == DAC_LFSRUnmask_Bits4_0) || \((VALUE) == DAC_LFSRUnmask_Bits5_0) || \((VALUE) == DAC_LFSRUnmask_Bits6_0) || \((VALUE) == DAC_LFSRUnmask_Bits7_0) || \((VALUE) == DAC_LFSRUnmask_Bits8_0) || \((VALUE) == DAC_LFSRUnmask_Bits9_0) || \((VALUE) == DAC_LFSRUnmask_Bits10_0) || \((VALUE) == DAC_LFSRUnmask_Bits11_0) || \((VALUE) == DAC_TriangleAmplitude_1) || \((VALUE) == DAC_TriangleAmplitude_3) || \((VALUE) == DAC_TriangleAmplitude_7) || \((VALUE) == DAC_TriangleAmplitude_15) || \((VALUE) == DAC_TriangleAmplitude_31) || \((VALUE) == DAC_TriangleAmplitude_63) || \((VALUE) == DAC_TriangleAmplitude_127) || \((VALUE) == DAC_TriangleAmplitude_255) || \((VALUE) == DAC_TriangleAmplitude_511) || \((VALUE) == DAC_TriangleAmplitude_1023) || \((VALUE) == DAC_TriangleAmplitude_2047) || \((VALUE) == DAC_TriangleAmplitude_4095))

DAC_output_buffer

/** @defgroup DAC_output_buffer * @{*/#define DAC_OutputBuffer_Enable            ((uint32_t)0x00000000)
#define DAC_OutputBuffer_Disable           ((uint32_t)0x00000002)
#define IS_DAC_OUTPUT_BUFFER_STATE(STATE) (((STATE) == DAC_OutputBuffer_Enable) || \((STATE) == DAC_OutputBuffer_Disable))

DAC_Channel_selection

/** @defgroup DAC_Channel_selection * @{*/#define DAC_Channel_1                      ((uint32_t)0x00000000)
#define DAC_Channel_2                      ((uint32_t)0x00000010)
#define IS_DAC_CHANNEL(CHANNEL) (((CHANNEL) == DAC_Channel_1) || \((CHANNEL) == DAC_Channel_2))

DAC_data_alignement

/** @defgroup DAC_data_alignement * @{*/#define DAC_Align_12b_R                    ((uint32_t)0x00000000)
#define DAC_Align_12b_L                    ((uint32_t)0x00000004)
#define DAC_Align_8b_R                     ((uint32_t)0x00000008)
#define IS_DAC_ALIGN(ALIGN) (((ALIGN) == DAC_Align_12b_R) || \((ALIGN) == DAC_Align_12b_L) || \((ALIGN) == DAC_Align_8b_R))

DAC_wave_generation

/** @defgroup DAC_wave_generation * @{*/#define DAC_Wave_Noise                     ((uint32_t)0x00000040)
#define DAC_Wave_Triangle                  ((uint32_t)0x00000080)
#define IS_DAC_WAVE(WAVE) (((WAVE) == DAC_Wave_Noise) || \((WAVE) == DAC_Wave_Triangle))

其它

/** @defgroup DAC_data * @{*/#define IS_DAC_DATA(DATA) ((DATA) <= 0xFFF0)
/*** @}*//** @defgroup DAC_interrupts_definition * @{*/
#define DAC_IT_DMAUDR                      ((uint32_t)0x00002000)
#define IS_DAC_IT(IT) (((IT) == DAC_IT_DMAUDR)) /*** @}*/ /** @defgroup DAC_flags_definition * @{*/ #define DAC_FLAG_DMAUDR                    ((uint32_t)0x00002000)
#define IS_DAC_FLAG(FLAG) (((FLAG) == DAC_FLAG_DMAUDR))

03. 相关函数

/*  Function used to set the DAC configuration to the default reset state *****/
void DAC_DeInit(void);/*  DAC channels configuration: trigger, output buffer, data format functions */
void DAC_Init(uint32_t DAC_Channel, DAC_InitTypeDef* DAC_InitStruct);
void DAC_StructInit(DAC_InitTypeDef* DAC_InitStruct);
void DAC_Cmd(uint32_t DAC_Channel, FunctionalState NewState);
void DAC_SoftwareTriggerCmd(uint32_t DAC_Channel, FunctionalState NewState);
void DAC_DualSoftwareTriggerCmd(FunctionalState NewState);
void DAC_WaveGenerationCmd(uint32_t DAC_Channel, uint32_t DAC_Wave, FunctionalState NewState);
void DAC_SetChannel1Data(uint32_t DAC_Align, uint16_t Data);
void DAC_SetChannel2Data(uint32_t DAC_Align, uint16_t Data);
void DAC_SetDualChannelData(uint32_t DAC_Align, uint16_t Data2, uint16_t Data1);
uint16_t DAC_GetDataOutputValue(uint32_t DAC_Channel);/* DMA management functions ***************************************************/
void DAC_DMACmd(uint32_t DAC_Channel, FunctionalState NewState);/* Interrupts and flags management functions **********************************/
void DAC_ITConfig(uint32_t DAC_Channel, uint32_t DAC_IT, FunctionalState NewState);
FlagStatus DAC_GetFlagStatus(uint32_t DAC_Channel, uint32_t DAC_FLAG);
void DAC_ClearFlag(uint32_t DAC_Channel, uint32_t DAC_FLAG);
ITStatus DAC_GetITStatus(uint32_t DAC_Channel, uint32_t DAC_IT);
void DAC_ClearITPendingBit(uint32_t DAC_Channel, uint32_t DAC_IT);

04. 结构体封装

/** * @brief Digital to Analog Converter*/typedef struct
{__IO uint32_t CR;       /*!< DAC control register,                                    Address offset: 0x00 */__IO uint32_t SWTRIGR;  /*!< DAC software trigger register,                           Address offset: 0x04 */__IO uint32_t DHR12R1;  /*!< DAC channel1 12-bit right-aligned data holding register, Address offset: 0x08 */__IO uint32_t DHR12L1;  /*!< DAC channel1 12-bit left aligned data holding register,  Address offset: 0x0C */__IO uint32_t DHR8R1;   /*!< DAC channel1 8-bit right aligned data holding register,  Address offset: 0x10 */__IO uint32_t DHR12R2;  /*!< DAC channel2 12-bit right aligned data holding register, Address offset: 0x14 */__IO uint32_t DHR12L2;  /*!< DAC channel2 12-bit left aligned data holding register,  Address offset: 0x18 */__IO uint32_t DHR8R2;   /*!< DAC channel2 8-bit right-aligned data holding register,  Address offset: 0x1C */__IO uint32_t DHR12RD;  /*!< Dual DAC 12-bit right-aligned data holding register,     Address offset: 0x20 */__IO uint32_t DHR12LD;  /*!< DUAL DAC 12-bit left aligned data holding register,      Address offset: 0x24 */__IO uint32_t DHR8RD;   /*!< DUAL DAC 8-bit right aligned data holding register,      Address offset: 0x28 */__IO uint32_t DOR1;     /*!< DAC channel1 data output register,                       Address offset: 0x2C */__IO uint32_t DOR2;     /*!< DAC channel2 data output register,                       Address offset: 0x30 */__IO uint32_t SR;       /*!< DAC status register,                                     Address offset: 0x34 */
} DAC_TypeDef;

05. 预留

06. 附录

6.1 【STM32】STM32系列教程汇总

网址：【STM32】STM32系列教程汇总

07. 声明

STM32F4xx英文参考手册