stm32f103zet6 写ad9959的代码

为了驱动AD9959芯片，我们需要使用STM32的SPI接口。

以下是一个简单的示例代码，用于将频率设置为10MHz：

#include "stm32f10x.h"

#define AD9959_CS_PIN GPIO_Pin_4
#define AD9959_CS_PORT GPIOA

void AD9959_Init(void);
void AD9959_SetFreq(uint32_t freq);

int main(void)
{
    AD9959_Init();
    AD9959_SetFreq(10000000); // 10MHz
    while (1);
}

void AD9959_Init(void)
{
    // 初始化SPI接口
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
    GPIO_InitTypeDef GPIO_InitStructure;
    SPI_InitTypeDef SPI_InitStructure;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_7; // SCK, MOSI
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOA, &GPIO_InitStructure);
    GPIO_InitStructure.GPIO_Pin = AD9959_CS_PIN; // CS
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_Init(AD9959_CS_PORT, &GPIO_InitStructure);
    SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Tx;
    SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
    SPI_InitStructure.SPI_DataSize = SPI_DataSize_16b;
    SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
    SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
    SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;
    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
    SPI_InitStructure.SPI_CRCPolynomial = 7;
    SPI_Init(SPI1, &SPI_InitStructure);
    SPI_Cmd(SPI1, ENABLE);
    GPIO_SetBits(AD9959_CS_PORT, AD9959_CS_PIN);
}

void AD9959_SetFreq(uint32_t freq)
{
    uint32_t fsys = 50000000; // STM32时钟频率为50MHz
    uint32_t delta = (uint32_t)(((double)freq / (double)fsys) * 4294967296.0);
    uint16_t data0 = (delta & 0xFFFF);
    uint16_t data1 = ((delta >> 16) & 0xFFFF);
    GPIO_ResetBits(AD9959_CS_PORT, AD9959_CS_PIN);
    SPI_I2S_SendData(SPI1, 0x2100); // 写频率控制寄存器
    while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) != RESET);
    SPI_I2S_SendData(SPI1, data0);
    while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) != RESET);
    SPI_I2S_SendData(SPI1, data1);
    while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_BSY) != RESET);
    GPIO_SetBits(AD9959_CS_PORT, AD9959_CS_PIN);
}

需要注意的是，这只是一个简单的示例代码，仅演示了如何设置频率。如果需要驱动AD9959芯片的其他功能（如幅度控制、相位控制等），还需要编写相应的代码。