1 /************************************************************************************* 2 Title : Analog Devices AD9833 DDS Wave Generator Library for STM32 Using HAL Libraries 3 Author: Bardia Alikhan Afshar <bardia.a.afshar@gmail.com> 4 Software: IAR Embedded Workbench for ARM 5 Hardware: Any STM32 device 6 *************************************************************************************/ 7 #include "AD9833.h" 8 9 /* 10 VCC --- 3.3V 11 SDATA --- PC12 12 SCLK --- PC10 13 FSYNC --- PC11 14 15 */ 16 // ------------------- Variables ---------------- 17 uint16_t FRQLW = 0; // MSB of Frequency Tuning Word 18 uint16_t FRQHW = 0; // LSB of Frequency Tuning Word 19 uint32_t phaseVal=0; // Phase Tuning Value 20 uint8_t WKNOWN=0; // Flag Variable 21 // -------------------------------- Functions -------------------------------- 22 23 // ----------------- Software SPI Function 24 void writeSPI(uint16_t word) { 25 for (uint8_t i = 0; i < 16 ; i++) { 26 if(word & 0x8000) HAL_GPIO_WritePin(AD9833PORT,AD9833DATA,GPIO_PIN_SET); //bit=1, Set High 27 else HAL_GPIO_WritePin(AD9833PORT,AD9833DATA,GPIO_PIN_RESET); //bit=0, Set Low 28 ASM_NOP(); 29 HAL_GPIO_WritePin(AD9833PORT,AD9833SCK,GPIO_PIN_RESET); //Data is valid on falling edge 30 ASM_NOP(); 31 HAL_GPIO_WritePin(AD9833PORT,AD9833SCK,GPIO_PIN_SET); 32 word = word<<1; //Shift left by 1 bit 33 } 34 HAL_GPIO_WritePin(AD9833PORT,AD9833DATA,GPIO_PIN_RESET); //Idle low 35 ASM_NOP(); 36 } 37 38 // ------------------------------------------------ Sets Output Wave Type 39 void AD9833_SetWave(uint16_t Wave){ 40 switch(Wave){ 41 case 0: 42 HAL_GPIO_WritePin(AD9833PORT,AD9833SS,GPIO_PIN_RESET); 43 writeSPI(0x2000); // Value for Sinusoidal Wave 44 HAL_GPIO_WritePin(AD9833PORT,AD9833SS,GPIO_PIN_SET); 45 WKNOWN=0; 46 break; 47 case 1: 48 HAL_GPIO_WritePin(AD9833PORT,AD9833SS,GPIO_PIN_RESET); 49 writeSPI(0x2028); // Value for Square Wave 50 HAL_GPIO_WritePin(AD9833PORT,AD9833SS,GPIO_PIN_SET); 51 WKNOWN=1; 52 break; 53 case 2: 54 HAL_GPIO_WritePin(AD9833PORT,AD9833SS,GPIO_PIN_RESET); 55 writeSPI(0x2002); // Value for Triangle Wave 56 HAL_GPIO_WritePin(AD9833PORT,AD9833SS,GPIO_PIN_SET); 57 WKNOWN=2; 58 break; 59 default: 60 break; 61 } 62 } 63 64 // ------------------------------------------------ Sets Wave Frequency & Phase (In Degree) In PHASE0 & FREQ0 Registers 65 void AD9833_SetWaveData(float Frequency,float Phase){ 66 ASM_NOP(); 67 // ---------- Tuning Word for Phase ( 0 - 360 Degree ) 68 if(Phase<0)Phase=0; // Changing Phase Value to Positive 69 if(Phase>360)Phase=360; // Maximum value For Phase (In Degree) 70 phaseVal = ((int)(Phase*(4096/360)))|0XC000; // 4096/360 = 11.37 change per Degree for Register And using 0xC000 which is Phase 0 Register Address 71 72 // ---------- Tuning word for Frequency 73 long freq=0; 74 freq=(int)(((Frequency*pow(2,28))/FMCLK)+1); // Tuning Word 75 FRQHW=(int)((freq & 0xFFFC000) >> 14); // FREQ MSB 76 FRQLW=(int)(freq & 0x3FFF); // FREQ LSB 77 FRQLW |= 0x4000; 78 FRQHW |= 0x4000; 79 // ------------------------------------------------ Writing DATA 80 HAL_GPIO_WritePin(AD9833PORT,AD9833DATA,GPIO_PIN_SET); 81 HAL_GPIO_WritePin(AD9833PORT,AD9833SCK,GPIO_PIN_SET); 82 HAL_GPIO_WritePin(AD9833PORT,AD9833SS,GPIO_PIN_SET); 83 HAL_GPIO_WritePin(AD9833PORT,AD9833SS,GPIO_PIN_RESET); //low = selected 84 ASM_NOP(); 85 writeSPI(0x2100); // enable 16bit words and set reset bit 86 writeSPI(FRQLW); 87 writeSPI(FRQHW); 88 writeSPI(phaseVal); 89 writeSPI(0x2000); // clear reset bit 90 ASM_NOP(); 91 HAL_GPIO_WritePin(AD9833PORT,AD9833SS,GPIO_PIN_SET); //high = deselected 92 AD9833_SetWave(WKNOWN); 93 ASM_NOP(); 94 return; 95 } 96 97 // ------------------------------------------------ Initializing AD9833 98 void AD9833_Init(uint16_t WaveType,float FRQ,float Phase){ 99 HAL_GPIO_WritePin(AD9833PORT,AD9833DATA,GPIO_PIN_SET); // Set All SPI pings to High 100 HAL_GPIO_WritePin(AD9833PORT,AD9833SCK,GPIO_PIN_SET); // Set All SPI pings to High 101 HAL_GPIO_WritePin(AD9833PORT,AD9833SS,GPIO_PIN_SET); // Set All SPI pings to High 102 AD9833_SetWave(WaveType); // Type Of Wave 103 AD9833_SetWaveData(FRQ,Phase); // Frequency & Phase Set 104 return; 105 }
1 #ifndef _AD_9833_H 2 #define _AD_9833_H 3 #include <math.h> 4 #include "stm32f4xx_hal.h" 5 6 // ------------------------- Defines ------------------------- 7 #define FMCLK 25000000 // Master Clock On AD9833 8 #define AD9833PORT GPIOG // PORT OF AD9833 9 #define AD9833DATA GPIO_PIN_6 // SPI DATA PIN 10 #define AD9833SCK GPIO_PIN_7 // SPI Clock PIN 11 #define AD9833SS GPIO_PIN_8 // SPI Chip Select 12 #define ASM_NOP() 13 // Assembly NOPE (Little Delay) 14 enum WaveType{SIN, SQR, TRI}; // Wave Selection Enum 15 16 // ------------------ Functions --------------------- 17 void AD9833_SetWave(uint16_t Wave); // Sets Output Wave Type 18 void AD9833_SetWaveData(float Frequency,float Phase); // Sets Wave Frequency & Phase 19 void AD9833_Init(uint16_t Wave,float FRQ,float Phase); // Initializing AD9833 20 #endif
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備注：代碼有兩部分，第一部分是AD9833.c文件，第二部分是AD9833.h文件，可根據行號區分兩部分內容（第一次寫博客，不太會排版）。
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