STM32 —— 多路DAC（输出电压和正弦波）

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//========================================DAC=========================================  

#define DA_OUT1_CHANNEL    DAC_Channel_1  

#define DA_OUT1_GRP        GPIOA  

#define DA_OUT1_INDEX      GPIO_Pin_4  

#define DA_OUT1_HIGH()     GPIO_SetBits(DA_OUT1_GRP, DA_OUT1_INDEX)  

#define DA_OUT1_CONFIG()   GPIOConfig(DA_OUT1_GRP, DA_OUT1_INDEX, GPIO_Mode_AIN)  

  

#define DA_OUT2_CHANNEL    DAC_Channel_2  

#define DA_OUT2_GRP        GPIOA  

#define DA_OUT2_INDEX      GPIO_Pin_5  

#define DA_OUT2_HIGH()     GPIO_SetBits(DA_OUT2_GRP, DA_OUT2_INDEX)  

#define DA_OUT2_CONFIG()   GPIOConfig(DA_OUT2_GRP, DA_OUT2_INDEX, GPIO_Mode_AIN)  

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#ifndef _DAC_H_  

#define _DAC_H_  

  

void DAC1Init(void);  

void DAC1OutVoltage(float data);  

void DAC2Init(void);  

  

#endif /* _DAC_H_ */  

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#include "dac.h"  

//#include "target.h"  

#include "type.h"  

  

#define DAC_DHR12RD_ADDRESS      0x40007420  

  

static const uint16_t sin[32] =  

{  

  2047, 2447, 2831, 3185, 3498, 3750, 3939, 4056, 4095, 4056,  

  3939, 3750, 3495, 3185, 2831, 2447, 2047, 1647, 1263, 909,  

  599, 344, 155, 38, 0, 38, 155, 344, 599, 909, 1263, 1647  

  

};  

static uint32_t dual_sin[32];  

static uint8_t index = 0;  

// PA4  

static void dac1_clk_init(void)  

{  

  RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);  

}  

  

static void dac1_gpio_init(void)  

{  

  DA_OUT1_CONFIG();  

  DA_OUT1_HIGH();  

}  

  

static void dac1_mode_init(void)  

{  

  DAC_InitTypeDef DAC_InitStructure;  

  

  DAC_InitStructure.DAC_Trigger = DAC_Trigger_Software;  

  DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;  

  DAC_InitStructure.DAC_LFSRUnmask_TriangleAmplitude = DAC_LFSRUnmask_Bits11_0;  

  DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Enable;  

  DAC_Init(DA_OUT1_CHANNEL, &DAC_InitStructure);  

  

  DAC_Cmd(DA_OUT1_CHANNEL, ENABLE);  

}  

  

void DAC1Init(void)  

{  

  dac1_clk_init();  

  dac1_gpio_init();  

  dac1_mode_init();  

}  

  

// DAC1OutVoltage(1.5);// 1.5V out  

void DAC1OutVoltage(float data)  

{  

  uint16_t value;  

  

  value = (uint16_t)((data / 3.3) * 4096);  

  

  DAC_SetChannel1Data(DAC_Align_12b_R, value);  

  DAC_SoftwareTriggerCmd(DA_OUT1_CHANNEL, ENABLE);  

}  

  

static void dac2_clk_init(void)  

{  

  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA2, ENABLE);  

  RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);  

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM8, ENABLE);  

}  

  

static void dac2_gpio_init(void)  

{  

  DA_OUT2_CONFIG();  

  DA_OUT2_HIGH();  

}  

  

static void dac2_timer_init(void)  

{  

  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;  

  

  TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);  

  TIM_TimeBaseStructure.TIM_Period = 0x19;  

  TIM_TimeBaseStructure.TIM_Prescaler = 0x0;  

  TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;  

  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  

  TIM_TimeBaseInit(TIM8, &TIM_TimeBaseStructure);  

  

  /* TIM8 TRGO selection */  

  TIM_SelectOutputTrigger(TIM8, TIM_TRGOSource_Update);  

}  

  

static void dac2_mode_init(void)  

{  

  DAC_InitTypeDef DAC_InitStructure;  

  

  /* DAC channel2 Configuration */  

  DAC_InitStructure.DAC_Trigger = DAC_Trigger_T8_TRGO;  

  DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None;  

  DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Disable;  

  DAC_Init(DA_OUT2_CHANNEL, &DAC_InitStructure);  

  

  for(index = 0; index < 32; ++index)  

  {  

    dual_sin[index] = (sin[index] << 16) + sin[index];  

  }  

}  

  

static void dac2_dma_init(void)  

{  

  DMA_InitTypeDef DMA_InitStructure;  

  

  /* DMA2 channel4 configuration */  

  DMA_DeInit(DMA2_Channel4);  

  DMA_InitStructure.DMA_PeripheralBaseAddr = DAC_DHR12RD_ADDRESS;  

  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&dual_sin;  

  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;  

  DMA_InitStructure.DMA_BufferSize = 32;  

  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;  

  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;  

  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;  

  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;  

  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;  

  DMA_InitStructure.DMA_Priority = DMA_Priority_High;  

  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;  

  DMA_Init(DMA2_Channel4, &DMA_InitStructure);  

}  

  

static void dac2_enable(void)  

{  

  DMA_Cmd(DMA2_Channel4, ENABLE);  

  DAC_Cmd(DA_OUT2_CHANNEL, ENABLE);  

  DAC_DMACmd(DA_OUT2_CHANNEL, ENABLE);  

  TIM_Cmd(TIM8, ENABLE);  

}  

  

void DAC2Init(void)  

{  

  dac2_clk_init();  

  dac2_gpio_init();  

  dac2_timer_init();  

  dac2_mode_init();  

  dac2_dma_init();  

  dac2_enable();  

}  

from：http://blog.csdn.net/wqx521/article/details/69468673