【NUCLEO-U545RE评测】驱动dds模块AD9833

Stm32McuLover 提问时间：2023-11-15 21:54 / 未解决

问答
是否解决:	未解决

手上有个DDS模块，本帖就用NUCLEO-U545RE来驱动它。
AD9833是ADI公司生产的一款低功耗，可编程波形发生器，能够产生正弦波、三角波、方波输出。波形发生器广泛应用于各种测量、激励和时域响应领域，AD9833无需外接元件，输出频率和相位都可通过软件编程，易于调节，频率寄存器是28位的，主频时钟为25MHz时，精度为0.1Hz，主频时钟为1MHz时，精度可以达到0.004Hz。

可以通过3个串行接口将数据写入AD983，这3个串口的最高工作频率可以达到40MHz，易于与DSP和各种主流微控制器兼容。AD9833的工作电压范围为2.3V-5.5V。

AD9833还具有休眠功能，可使没被使用的部分休眠，减少该部分的电流损耗，例如，若利用AD9833输岀作为时钟源，就可以让DAC休眠，以减小功耗，该电路采用10引脚MSOP型表面贴片封装，体积很小。

AD9833特点
频率和相位可数字编程
工作电压为3V时，功耗仅为20mW
输出频率范围为OHz-12.5MHz
频率寄存器为28位(在25Mz的参考时钟下，精度为0.1Hz)
可选择正弦波、三角波、方波输出
无需外界元件
3线SPI接口
温度范围为-40℃-+105℃
总结：模块与单片机之间是通过SPI通信的方式，通过对芯片内部寄存器的操作可以调节模块的数据频率和相位。可输出的频率范围是0—13.5MHZ。可以输出正弦波、三角波和方波。
根据原理图确定管脚：
屏幕截图 2023-11-15 214654.png

配置如下

驱动头文件ad9833.h

/*************************************************************************************
Title : Analog Devices AD9833 DDS Wave Generator Library for STM32 Using HAL Libraries
Author: Bardia Alikhan Afshar <bardia.a.afshar@gmail.com>
Software: IAR Embedded Workbench for ARM
Hardware: Any STM32 device
*************************************************************************************/
#ifndef _AD_9833_H
#define _AD_9833_H
#include <math.h>
#include "stm32u5xx_hal.h"
#include "main.h"
// ------------------------- Defines -------------------------
#define FMCLK 25000000 // Master Clock On AD9833
#define AD9833SSPORT ad9833_cs_GPIO_Port // PORT OF AD9833
#define AD9833DATAPORT ad9833_dat_GPIO_Port // PORT OF AD9833
#define AD9833SCKPORT ad9833_sck_GPIO_Port // PORT OF AD9833
#define AD9833DATA ad9833_dat_Pin // SPI DATA PIN
#define AD9833SCK ad9833_sck_Pin // SPI Clock PIN
#define AD9833SS ad9833_cs_Pin // SPI Chip Select
#define ASM_NOP() asm("NOP") // Assembly NOPE (Little Delay)
enum WaveType{SIN, SQR, TRI}; // Wave Selection Enum
// ------------------ Functions ---------------------
void AD9833_SetWave(uint16_t Wave); // Sets Output Wave Type
void AD9833_SetWaveData(float Frequency,float Phase); // Sets Wave Frequency & Phase
void AD9833_Init(uint16_t Wave,float FRQ,float Phase); // Initializing AD9833
#endif

复制代码

驱动源文件ad9833.c

/*************************************************************************************
Title : Analog Devices AD9833 DDS Wave Generator Library for STM32 Using HAL Libraries
Author: Bardia Alikhan Afshar <bardia.a.afshar@gmail.com>
Software: IAR Embedded Workbench for ARM
Hardware: Any STM32 device
*************************************************************************************/
#include "AD9833.h"
// ------------------- Variables ----------------
uint16_t FRQLW = 0; // MSB of Frequency Tuning Word
uint16_t FRQHW = 0; // LSB of Frequency Tuning Word
uint32_t phaseVal=0; // Phase Tuning Value
uint8_t WKNOWN=0; // Flag Variable
// -------------------------------- Functions --------------------------------
// ------------------------------------------------ Software SPI Function
void writeSPI(uint16_t word) {
for (uint8_t i = 0; i < 16 ; i++) {
if(word & 0x8000) HAL_GPIO_WritePin(AD9833DATAPORT,AD9833DATA,GPIO_PIN_SET); //bit=1, Set High
else HAL_GPIO_WritePin(AD9833DATAPORT,AD9833DATA,GPIO_PIN_RESET); //bit=0, Set Low
__NOP();
HAL_GPIO_WritePin(ad9833_sck_GPIO_Port,AD9833SCK,GPIO_PIN_RESET); //Data is valid on falling edge
__NOP();
HAL_GPIO_WritePin(ad9833_sck_GPIO_Port,AD9833SCK,GPIO_PIN_SET);
word = word<<1; //Shift left by 1 bit
}
HAL_GPIO_WritePin(AD9833DATAPORT,AD9833DATA,GPIO_PIN_RESET); //Idle low
__NOP();
}
// ------------------------------------------------ Sets Output Wave Type
void AD9833_SetWave(uint16_t Wave){
switch(Wave){
case 0:
HAL_GPIO_WritePin(AD9833SSPORT,AD9833SS,GPIO_PIN_RESET);
writeSPI(0x2000); // Value for Sinusoidal Wave
HAL_GPIO_WritePin(AD9833SSPORT,AD9833SS,GPIO_PIN_SET);
WKNOWN=0;
break;
case 1:
HAL_GPIO_WritePin(AD9833SSPORT,AD9833SS,GPIO_PIN_RESET);
writeSPI(0x2028); // Value for Square Wave
HAL_GPIO_WritePin(AD9833SSPORT,AD9833SS,GPIO_PIN_SET);
WKNOWN=1;
break;
case 2:
HAL_GPIO_WritePin(AD9833SSPORT,AD9833SS,GPIO_PIN_RESET);
writeSPI(0x2002); // Value for Triangle Wave
HAL_GPIO_WritePin(AD9833SSPORT,AD9833SS,GPIO_PIN_SET);
WKNOWN=2;
break;
default:
break;
}
}
// ------------------------------------------------ Sets Wave Frequency & Phase (In Degree) In PHASE0 & FREQ0 Registers
void AD9833_SetWaveData(float Frequency,float Phase){
__NOP();
// ---------- Tuning Word for Phase ( 0 - 360 Degree )
if(Phase<0)Phase=0; // Changing Phase Value to Positive
if(Phase>360)Phase=360; // Maximum value For Phase (In Degree)
phaseVal = ((int)(Phase*(4096/360)))|0XC000; // 4096/360 = 11.37 change per Degree for Register And using 0xC000 which is Phase 0 Register Address
// ---------- Tuning word for Frequency
long freq=0;
freq=(int)(((Frequency*pow(2,28))/FMCLK)+1); // Tuning Word
FRQHW=(int)((freq & 0xFFFC000) >> 14); // FREQ MSB
FRQLW=(int)(freq & 0x3FFF); // FREQ LSB
FRQLW |= 0x4000;
FRQHW |= 0x4000;
// ------------------------------------------------ Writing DATA
HAL_GPIO_WritePin(AD9833DATAPORT,AD9833DATA,GPIO_PIN_SET);
HAL_GPIO_WritePin(ad9833_sck_GPIO_Port,AD9833SCK,GPIO_PIN_SET);
HAL_GPIO_WritePin(AD9833SSPORT,AD9833SS,GPIO_PIN_SET);
HAL_GPIO_WritePin(AD9833SSPORT,AD9833SS,GPIO_PIN_RESET); //low = selected
__NOP();
writeSPI(0x2100); // enable 16bit words and set reset bit
writeSPI(FRQLW);
writeSPI(FRQHW);
writeSPI(phaseVal);
writeSPI(0x2000); // clear reset bit
__NOP();
HAL_GPIO_WritePin(AD9833SSPORT,AD9833SS,GPIO_PIN_SET); //high = deselected
AD9833_SetWave(WKNOWN);
__NOP();
return;
}
// ------------------------------------------------ Initializing AD9833
void AD9833_Init(uint16_t WaveType,float FRQ,float Phase){
HAL_GPIO_WritePin(AD9833DATAPORT,AD9833DATA,GPIO_PIN_SET); // Set All SPI pings to High
HAL_GPIO_WritePin(ad9833_sck_GPIO_Port,AD9833SCK,GPIO_PIN_SET); // Set All SPI pings to High
HAL_GPIO_WritePin(AD9833SSPORT,AD9833SS,GPIO_PIN_SET); // Set All SPI pings to High
AD9833_SetWave(WaveType); // Type Of Wave
AD9833_SetWaveData(FRQ,Phase); // Frequency & Phase Set
return;
}