AD9833如何通过代码生成数字波形
时间: 2024-05-04 15:17:45 浏览: 25
AD9833是一款直接数字合成器(DDS),可以通过代码生成数字波形。下面是一个基本的代码示例,用于生成一个简单的正弦波:
1. 初始化AD9833芯片
```
void AD9833_Init(void)
{
SPI_Write(0x2100); // Enable the internal clock and set the control register to the default values
AD9833_Sleep(false); // Wake up the AD9833
AD9833_Reset(); // Reset the AD9833
}
```
2. 设置频率和相位
```
void AD9833_SetFrequency(uint32_t freq)
{
uint32_t freq_reg = freq * 10.73741824;
uint16_t freq_lsb = freq_reg & 0x3FFF;
uint16_t freq_msb = (freq_reg >> 14) & 0x3FFF;
uint16_t freq_ctrl = (0x2000 | freq_msb); // Set the frequency control bits to 0b10
SPI_Write(freq_ctrl); // Write the frequency control bits to the AD9833
SPI_Write(freq_lsb); // Write the lower 14 bits of the frequency to the AD9833
}
void AD9833_SetPhase(uint16_t phase)
{
uint16_t phase_ctrl = (0xC000 | phase); // Set the phase control bits to 0b1100
SPI_Write(phase_ctrl); // Write the phase control bits to the AD9833
}
```
3. 生成正弦波
```
void AD9833_SetWaveform(uint16_t waveform)
{
uint16_t waveform_ctrl = (0x2000 | waveform); // Set the waveform control bits to 0b10
SPI_Write(waveform_ctrl); // Write the waveform control bits to the AD9833
}
void AD9833_GenerateWaveform(void)
{
AD9833_SetFrequency(10000); // Set the frequency to 10kHz
AD9833_SetPhase(0); // Set the phase to 0 degrees
AD9833_SetWaveform(0x0002); // Set the waveform to a sine wave
}
```
这个代码示例设置了AD9833芯片的频率、相位和波形,然后通过SPI接口将设置写入芯片。最后,可以使用这些设置生成数字波形。
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