STM32 —— 多路DAC（输出电压和正弦波）

//========================================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)

#ifndef _DAC_H_
#define _DAC_H_

void DAC1Init(void);
void DAC1OutVoltage(float data);
void DAC2Init(void);

#endif /* _DAC_H_ */

#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();
}