用stm32f1的标准库实现AD9834扫频

下面是一个使用STM32F1标准库实现AD9834扫频的简单示例代码：

#include "stm32f10x.h"
#include "delay.h"

#define AD9834_FSYNC_PIN    GPIO_Pin_0
#define AD9834_FSYNC_PORT   GPIOA
#define AD9834_SCLK_PIN     GPIO_Pin_1
#define AD9834_SCLK_PORT    GPIOA
#define AD9834_SDIN_PIN     GPIO_Pin_2
#define AD9834_SDIN_PORT    GPIOA
#define AD9834_RST_PIN      GPIO_Pin_3
#define AD9834_RST_PORT     GPIOA

void AD9834_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

    // 配置FSYNC引脚
    GPIO_InitStructure.GPIO_Pin = AD9834_FSYNC_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(AD9834_FSYNC_PORT, &GPIO_InitStructure);

    // 配置SCLK引脚
    GPIO_InitStructure.GPIO_Pin = AD9834_SCLK_PIN;
    GPIO_Init(AD9834_SCLK_PORT, &GPIO_InitStructure);

    // 配置SDIN引脚
    GPIO_InitStructure.GPIO_Pin = AD9834_SDIN_PIN;
    GPIO_Init(AD9834_SDIN_PORT, &GPIO_InitStructure);

    // 配置RST引脚
    GPIO_InitStructure.GPIO_Pin = AD9834_RST_PIN;
    GPIO_Init(AD9834_RST_PORT, &GPIO_InitStructure);
}

void AD9834_WriteByte(uint8_t data)
{
    uint8_t i;

    for (i = 0; i < 8; i++)
    {
        if (data & 0x80)
        {
            GPIO_SetBits(AD9834_SDIN_PORT, AD9834_SDIN_PIN);
        }
        else
        {
            GPIO_ResetBits(AD9834_SDIN_PORT, AD9834_SDIN_PIN);
        }
        GPIO_SetBits(AD9834_SCLK_PORT, AD9834_SCLK_PIN);
        data <<= 1;
        GPIO_ResetBits(AD9834_SCLK_PORT, AD9834_SCLK_PIN);
    }
}

void AD9834_SetFrequency(uint32_t frequency)
{
    uint32_t frequency_word = (frequency * 4294967296) / 25000000;

    GPIO_ResetBits(AD9834_FSYNC_PORT, AD9834_FSYNC_PIN);

    // 写入频率控制字0
    AD9834_WriteByte(0x40);
    AD9834_WriteByte((frequency_word >> 8) & 0xFF);
    AD9834_WriteByte(frequency_word & 0xFF);

    // 写入频率控制字1
    AD9834_WriteByte(0x60);
    AD9834_WriteByte((frequency_word >> 24) & 0xFF);
    AD9834_WriteByte((frequency_word >> 16) & 0xFF);

    GPIO_SetBits(AD9834_FSYNC_PORT, AD9834_FSYNC_PIN);
}

int main(void)
{
    AD9834_Init();
  
    // 设置初始频率为1kHz
    AD9834_SetFrequency(1000);

    while (1)
    {
        // 扫频
        for (int i = 100; i <= 10000; i += 100)
        {
            AD9834_SetFrequency(i);
            delay_ms(10);
        }
    }
}

这个示例代码使用了标准库的延时函数来控制扫频频率，您可以根据需要进行调整。请注意，这个示例代码假设您已经配置好了延时函数（例如使用SysTick定时器）。希望对您有所帮助！