基于ad9850的函数信号发生器程序
时间: 2024-02-06 18:01:12 浏览: 34
基于AD9850的函数信号发生器程序是一种用来产生各种类型函数信号的设备。AD9850是一种直接数字频率合成器(Direct Digital Synthesizer,DDS),它能够通过数字方式生成连续可变频率的信号。
这个程序主要由以下几个部分组成:控制模块、频率控制模块和输出模块。
控制模块是程序的核心部分,它负责通过计算和控制AD9850的工作方式来生成特定频率的信号,用户可以通过设置按钮或者旋转编码器来改变频率、波形和幅度等参数。
频率控制模块用于设置要产生的信号的频率。它可以根据用户的需求,通过调整参数来生成不同频率的正弦波、方波、三角波等各种波形。
输出模块用于将生成的信号发送到外部设备,比如示波器、扬声器等。用户可以通过接口将设备连接到AD9850芯片的输出引脚上,然后使用输出模块来对接收到的信号进行处理和显示。
基于AD9850的函数信号发生器程序具有多种功能和灵活性。它可以广泛应用于各种领域,比如电子实验、通信、音频测试等。使用这个程序,用户可以方便地生成各种类型的信号,实现各种实验和测试需求。同时,基于AD9850的函数信号发生器程序还具有高性能和稳定性,能够准确可靠地产生所需信号,为用户提供优质的实验环境。
相关问题
基于51单片机的dds信号发生器
要实现基于51单片机的DDS信号发生器,需要一些硬件和软件资源。
硬件资源:
1. 51单片机
2. AD9850芯片
3. LCD1602液晶显示屏
4. 其他相关电子器件
软件资源:
1. Keil C51编译器
2. 相关的C语言库函数
下面是一个基于51单片机的DDS信号发生器的示例代码:
```c
#include <reg51.h>
#define FREQ0 1000.0 //默认输出频率为1kHz
#define FREQ1 125000.0 //AD9850的参考频率为125MHz
unsigned long int frequency; //用于存储输出频率
unsigned char phase; //用于存储输出相位
void delay(unsigned int t) //简单的延时函数
{
unsigned int i, j;
for (i = 0; i < t; i++)
for (j = 0; j < 125; j++);
}
void write_ad9850(unsigned char data) //向AD9850写入8位数据
{
unsigned char i;
for (i = 0; i < 8; i++)
{
if (data & 0x80)
P2 |= 0x02;
else
P2 &= ~0x02;
P2 |= 0x04;
P2 &= ~0x04;
data <<= 1;
}
}
void set_frequency(unsigned long int freq) //设置输出频率
{
unsigned long int delta;
unsigned char i;
delta = freq / FREQ1 * 4294967296.0;
write_ad9850(0x20);
write_ad9850(delta >> 24);
write_ad9850(delta >> 16);
write_ad9850(delta >> 8);
write_ad9850(delta);
write_ad9850(0x0);
write_ad9850(0x0);
write_ad9850(0x0);
write_ad9850(0x0);
P2 &= ~0x08;
P2 |= 0x08;
}
void set_phase(unsigned char ph) //设置输出相位
{
unsigned char i;
ph = ph % 360;
ph = ph / 1.41;
write_ad9850(0xC0);
write_ad9850(ph);
write_ad9850(0x0);
write_ad9850(0x0);
write_ad9850(0x0);
}
void lcd_init() //初始化LCD1602液晶显示屏
{
delay(15);
P0 = 0x30;
P2 &= ~0x01;
delay(5);
P2 |= 0x01;
delay(5);
P0 = 0x30;
P2 &= ~0x01;
delay(5);
P2 |= 0x01;
delay(5);
P0 = 0x30;
P2 &= ~0x01;
delay(5);
P2 |= 0x01;
delay(5);
P0 = 0x38;
P2 &= ~0x01;
delay(5);
P2 |= 0x01;
delay(5);
P0 = 0x08;
P2 &= ~0x01;
delay(5);
P2 |= 0x01;
delay(5);
P0 = 0x01;
P2 &= ~0x01;
delay(5);
P2 |= 0x01;
delay(5);
P0 = 0x06;
P2 &= ~0x01;
delay(5);
P2 |= 0x01;
delay(5);
P0 = 0x0C;
P2 &= ~0x01;
delay(5);
P2 |= 0x01;
delay(5);
}
void lcd_display(unsigned char row, unsigned char column, unsigned char *str) //在LCD1602液晶显示屏上显示字符串
{
unsigned char i;
if (row)
column |= 0x40;
column |= 0x80;
P0 = column;
P2 &= ~0x01;
delay(5);
P2 |= 0x01;
delay(5);
for (i = 0; str[i]; i++)
{
P0 = str[i];
P2 |= 0x04;
P2 &= ~0x04;
delay(5);
}
}
void main()
{
unsigned char buf[16];
frequency = FREQ0;
phase = 0;
lcd_init();
set_frequency(frequency);
set_phase(phase);
while (1)
{
sprintf(buf, "Freq:%dHz", frequency);
lcd_display(0, 0, buf);
sprintf(buf, "Phase:%d", phase);
lcd_display(1, 0, buf);
delay(200);
}
}
```
这个示例代码使用了AD9850芯片来生成DDS信号,并通过LCD1602液晶显示屏显示当前的输出频率和输出相位。在代码中还实现了设置输出频率和相位的函数,并通过按键等外部输入来修改这些参数。你可以根据自己的需求进行修改和扩展。
STM32H743结合AD9850芯片实现低频信号发生器设计代码
以下是STM32H743结合AD9850芯片实现低频信号发生器的设计代码,仅供参考:
```c
#include "stm32h7xx.h"
#include "stm32h7xx_hal.h"
#define FXTAL 25000000UL
#define PI 3.14159265358979323846
static SPI_HandleTypeDef hspi1;
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_SPI1_Init(void);
void AD9850_Set_Frequency(uint32_t freq)
{
uint32_t fword = (freq * 4294967296) / FXTAL;
uint8_t buffer[5];
buffer[0] = 0x02;
buffer[1] = (fword & 0xFF);
buffer[2] = (fword >> 8) & 0xFF;
buffer[3] = (fword >> 16) & 0xFF;
buffer[4] = (fword >> 24) & 0xFF;
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_12, GPIO_PIN_RESET);
HAL_SPI_Transmit(&hspi1, buffer, 5, 100);
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_12, GPIO_PIN_SET);
}
void AD9850_Set_Phase(uint16_t phase)
{
uint16_t pword = (phase * 65536) / 360;
uint8_t buffer[3];
buffer[0] = 0x01;
buffer[1] = (pword >> 8) & 0xFF;
buffer[2] = pword & 0xFF;
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_12, GPIO_PIN_RESET);
HAL_SPI_Transmit(&hspi1, buffer, 3, 100);
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_12, GPIO_PIN_SET);
}
void AD9850_Set_Waveform(uint8_t waveform)
{
uint8_t buffer[2];
buffer[0] = 0x00;
buffer[1] = waveform & 0x0F;
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_12, GPIO_PIN_RESET);
HAL_SPI_Transmit(&hspi1, buffer, 2, 100);
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_12, GPIO_PIN_SET);
}
int main(void)
{
HAL_Init();
SystemClock_Config();
MX_GPIO_Init();
MX_SPI1_Init();
while (1)
{
for (uint16_t i = 0; i < 360; i++)
{
AD9850_Set_Phase(i);
AD9850_Set_Frequency(1000 * sin(i * PI / 180) + 2000);
HAL_Delay(10);
}
}
}
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};
/** Configure LSE Drive Capability
*/
HAL_PWR_EnableBkUpAccess();
__HAL_RCC_LSEDRIVE_CONFIG(RCC_LSEDRIVE_LOW);
HAL_PWR_DisableBkUpAccess();
/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLM = 25;
RCC_OscInitStruct.PLL.PLLN = 400;
RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV8;
RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
/** Initializes the CPU, AHB and APB buses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_SYSCLK |
RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_6) != HAL_OK)
{
Error_Handler();
}
PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_SPI1;
PeriphClkInit.Spi123ClockSelection = RCC_SPI123CLKSOURCE_PLL;
if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
{
Error_Handler();
}
}
static void MX_SPI1_Init(void)
{
hspi1.Instance = SPI1;
hspi1.Init.Mode = SPI_MODE_MASTER;
hspi1.Init.Direction = SPI_DIRECTION_2LINES;
hspi1.Init.DataSize = SPI_DATASIZE_8BIT;
hspi1.Init.CLKPolarity = SPI_POLARITY_LOW;
hspi1.Init.CLKPhase = SPI_PHASE_1EDGE;
hspi1.Init.NSS = SPI_NSS_SOFT;
hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_32;
hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;
hspi1.Init.TIMode = SPI_TIMODE_DISABLE;
hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
hspi1.Init.CRCPolynomial = 7;
if (HAL_SPI_Init(&hspi1) != HAL_OK)
{
Error_Handler();
}
}
static void MX_GPIO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
__HAL_RCC_GPIOB_CLK_ENABLE();
GPIO_InitStruct.Pin = GPIO_PIN_12;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
}
```
此代码使用了 STM32H743 的 SPI 和 GPIO 与 AD9850 通信,通过调用 AD9850_Set_Frequency()、AD9850_Set_Phase() 和 AD9850_Set_Waveform() 函数来设置 AD9850 的频率、相位和波形。在此示例中,通过循环改变相位和频率来产生正弦波。请注意,此代码仅作为示例,实际应用可能需要进行更多的错误处理和优化。
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