AD5663是ADI公司的一款DAC模块，用以实现两路模拟量信号输出。该芯片通过SPI通信来驱动。下面讲解使用STM32F7主控芯片来控制AD5663模拟量输出的流程。

配置STM32F7 SPI通信管脚

STM32CubeMX生成SPI驱动代码

/* SPI3 init function */
void MX_SPI3_Init(void)
{

  /* USER CODE BEGIN SPI3_Init 0 */

  /* USER CODE END SPI3_Init 0 */

  /* USER CODE BEGIN SPI3_Init 1 */

  /* USER CODE END SPI3_Init 1 */
  hspi3.Instance = SPI3;
  hspi3.Init.Mode = SPI_MODE_MASTER;
  hspi3.Init.Direction = SPI_DIRECTION_2LINES;
  hspi3.Init.DataSize = SPI_DATASIZE_8BIT;
  hspi3.Init.CLKPolarity = SPI_POLARITY_LOW;
  hspi3.Init.CLKPhase = SPI_PHASE_2EDGE;
  hspi3.Init.NSS = SPI_NSS_SOFT;
  hspi3.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_32;
  hspi3.Init.FirstBit = SPI_FIRSTBIT_MSB;
  hspi3.Init.TIMode = SPI_TIMODE_DISABLE;
  hspi3.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
  hspi3.Init.CRCPolynomial = 7;
  hspi3.Init.CRCLength = SPI_CRC_LENGTH_DATASIZE;
  hspi3.Init.NSSPMode = SPI_NSS_PULSE_DISABLE;
  if (HAL_SPI_Init(&hspi3) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN SPI3_Init 2 */

  /* USER CODE END SPI3_Init 2 */

}

AD5663驱动代码开发

头文件io.h

#ifndef __IO_H__
#define __IO_H__

#ifdef __cplusplus
extern "C" {
#endif

/* Includes ------------------------------------------------------------------*/
#include "gpio.h"

/* USER CODE BEGIN Includes */

/* USER CODE END Includes */

/* USER CODE BEGIN Private defines */

/* USER CODE END Private defines */
/* USER CODE BEGIN Prototypes */

/*ÃüÁÒå*/
#define Write_to_Input_Register         0x000000
#define Update_DAC_Register             0x080000
#define Software_LDAC                   0x100000
#define WriteTo_Update_DAC_Channel      0x180000
#define Power_Down                      0x200000
#define RESET                           0x280000
#define LDAC_Register_Setup             0x300000
#define Reference_Set                   0x380000

/*µØַģʽ,Ñ¡ÔñDACͨµÀ*/
#define DAC_Channel_A                   0x000000
#define DAC_Channel_B                   0x010000
#define DAC_Channel_All                 0X070000

//FOR POWER DOWN
#define NORMAL                     0X00
#define K1Ohm                      0X10
#define K100Ohm                    0X20
#define ThreeState                 0X30

#define PDACA                      0X01
#define PDACB                      0X02


typedef enum
{
    AOUT1 = 0,
    AOUT2  = 1,
} AOUT_NAME;

extern void IO_Initialize(void);
extern void Set_AOUT_Level(AOUT_NAME aout, uint16_t level);
extern void IO_Function_Test(void);

源文件io.c

#include <string.h>
#include "io.h"
#include "spi.h"
#include "usart.h"

/*Global variables*/
uint16_t Aout1, Aout2;

static void AD5663_PowerDown(void)
{
    uint32_t inputShiftData = 0;
    uint8_t SendSPIByte[3];

    inputShiftData = Power_Down| NORMAL | PDACA | PDACB;

    SendSPIByte[0] = inputShiftData>>16;
    SendSPIByte[1] = inputShiftData>>8;
    SendSPIByte[2] = inputShiftData;

    HAL_GPIO_WritePin(DA_SYNC_GPIO_Port, DA_SYNC_Pin, GPIO_PIN_RESET);
    HAL_SPI_Transmit(&hspi3, SendSPIByte, sizeof(SendSPIByte), 100);
    HAL_GPIO_WritePin(DA_SYNC_GPIO_Port, DA_SYNC_Pin, GPIO_PIN_SET);
}


void IO_Initialize(void)
{
    AD5663_PowerDown();
}

void Set_AOUT_Level(AOUT_NAME aout, uint16_t level)
{
    uint32_t inputShiftData = 0;
    uint8_t SendSPIByte[3];

    if(aout == AOUT1)
    {
        Aout1 = level;
        inputShiftData = WriteTo_Update_DAC_Channel | DAC_Channel_A | level;
    }
    else if(aout == AOUT2)
    {
        Aout2 = level;
        inputShiftData = WriteTo_Update_DAC_Channel | DAC_Channel_B | level;
    }

    SendSPIByte[0] = inputShiftData>>16;
    SendSPIByte[1] = inputShiftData>>8;
    SendSPIByte[2] = inputShiftData;

    HAL_GPIO_WritePin(DA_SYNC_GPIO_Port, DA_SYNC_Pin, GPIO_PIN_RESET);
    HAL_SPI_Transmit(&hspi3, SendSPIByte, sizeof(SendSPIByte), 100);
    HAL_GPIO_WritePin(DA_SYNC_GPIO_Port, DA_SYNC_Pin, GPIO_PIN_SET);
}

void IO_Function_Test(void)
{
    Set_AOUT_Level(AOUT1, 0x8000);
    Set_AOUT_Level(AOUT2, 0xEFFF);
}