STM32F0 Standard Peripheral bibliotheek
1.0
ST Microelectronics standard peripheral bibliotheek documentatie voor de STM32F0 familie
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This file provides firmware functions to manage the following functionalities of the Digital-to-Analog Converter (DAC) peripheral: More...
#include "stm32f0xx_dac.h"
Macros | |
#define | CR_CLEAR_MASK ((uint32_t)0x0000003E) |
#define | DHR12R1_OFFSET ((uint32_t)0x00000008) |
#define | DOR_OFFSET ((uint32_t)0x0000002C) |
Functions | |
void | DAC_DeInit (void) |
Deinitializes the DAC peripheral registers to their default reset values. More... | |
void | DAC_Init (uint32_t DAC_Channel, DAC_InitTypeDef *DAC_InitStruct) |
Initializes the DAC peripheral according to the specified parameters in the DAC_InitStruct. More... | |
void | DAC_StructInit (DAC_InitTypeDef *DAC_InitStruct) |
Fills each DAC_InitStruct member with its default value. More... | |
void | DAC_Cmd (uint32_t DAC_Channel, FunctionalState NewState) |
Enables or disables the specified DAC channel. More... | |
void | DAC_SoftwareTriggerCmd (uint32_t DAC_Channel, FunctionalState NewState) |
Enables or disables the selected DAC channel software trigger. More... | |
void | DAC_SetChannel1Data (uint32_t DAC_Align, uint16_t Data) |
Set the specified data holding register value for DAC channel1. More... | |
uint16_t | DAC_GetDataOutputValue (uint32_t DAC_Channel) |
Returns the last data output value of the selected DAC channel. More... | |
void | DAC_DMACmd (uint32_t DAC_Channel, FunctionalState NewState) |
Enables or disables the specified DAC channel DMA request. When enabled DMA1 is generated when an external trigger (EXTI Line9, TIM2, TIM3, TIM6 or TIM15 but not a software trigger) occurs. More... | |
void | DAC_ITConfig (uint32_t DAC_Channel, uint32_t DAC_IT, FunctionalState NewState) |
Enables or disables the specified DAC interrupts. More... | |
FlagStatus | DAC_GetFlagStatus (uint32_t DAC_Channel, uint32_t DAC_FLAG) |
Checks whether the specified DAC flag is set or not. More... | |
void | DAC_ClearFlag (uint32_t DAC_Channel, uint32_t DAC_FLAG) |
Clears the DAC channel's pending flags. More... | |
ITStatus | DAC_GetITStatus (uint32_t DAC_Channel, uint32_t DAC_IT) |
Checks whether the specified DAC interrupt has occurred or not. More... | |
void | DAC_ClearITPendingBit (uint32_t DAC_Channel, uint32_t DAC_IT) |
Clears the DAC channel's interrupt pending bits. More... | |
This file provides firmware functions to manage the following functionalities of the Digital-to-Analog Converter (DAC) peripheral:
* =============================================================================== ##### DAC Peripheral features ##### =============================================================================== [..] The device integrates one 12-bit Digital Analog Converters refered as DAC channel1 with DAC_OUT1 (PA4) as output [..] Digital to Analog conversion can be non-triggered using DAC_Trigger_None and DAC_OUT1 is available once writing to DHRx register using DAC_SetChannel1Data(). [..] Digital to Analog conversion can be triggered by: (#) External event: EXTI Line 9 (any GPIOx_Pin9) using DAC_Trigger_Ext_IT9. The used pin (GPIOx_Pin9) must be configured in input mode. (#) Timers TRGO: TIM2, TIM3, TIM6 and TIM15 (DAC_Trigger_T2_TRGO, DAC_Trigger_T3_TRGO...) The timer TRGO event should be selected using TIM_SelectOutputTrigger() (#) Software using DAC_Trigger_Software [..] The DAC channel 1 integrates an output buffer that can be used to reduce the output impedance, and to drive external loads directly without having to add an external operational amplifier. To enable the output buffer use DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Enable; [..] Refer to the device datasheet for more details about output impedance value with and without output buffer. [..] The DAC data format can be: (#) 8-bit right alignment using DAC_Align_8b_R (#) 12-bit left alignment using DAC_Align_12b_L (#) 12-bit right alignment using DAC_Align_12b_R [..] The analog output voltage on each DAC channel pin is determined by the following equation: DAC_OUTx = VREF+ * DOR / 4095 with DOR is the Data Output Register VEF+ is the input voltage reference (refer to the device datasheet) e.g. To set DAC_OUT1 to 0.7V, use DAC_SetChannel1Data(DAC_Align_12b_R, 868); Assuming that VREF+ = 3.3, DAC_OUT1 = (3.3 * 868) / 4095 = 0.7V [..] A DMA1 request can be generated when an external trigger (but not a software trigger) occurs if DMA1 requests are enabled using DAC_DMACmd() DMA1 requests are mapped as following: (+) DAC channel1 is mapped on DMA1 channel3 which must be already configured ##### How to use this driver ##### =============================================================================== [..] (+) Enable DAC APB1 clock to get write access to DAC registers using RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE) (+) Configure DAC_OUT1 (DAC_OUT1: PA4) in analog mode using GPIO_Init() function (+) Configure the DAC channel using DAC_Init() (+) Enable the DAC channel using DAC_Cmd()
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