arm_fir_init_f32.c代码
时间: 2023-08-02 07:10:50 浏览: 310
以下是arm_fir_init_f32.c的代码:
```c
arm_status arm_fir_init_f32(
arm_fir_instance_f32 * S,
uint16_t numTaps,
float32_t * pCoeffs,
float32_t * pState,
uint32_t blockSize)
{
/* Assign filter taps */
S->numTaps = numTaps;
/* Assign coefficient pointer */
S->pCoeffs = pCoeffs;
/* Clear state buffer and size is always blockSize + numTaps - 1 */
memset(pState, 0, (numTaps + (blockSize - 1U)) * sizeof(float32_t));
/* Assign state pointer */
S->pState = pState;
return (ARM_MATH_SUCCESS);
}
```
该函数首先将滤波器的阶数和系数指针赋给滤波器实例结构体S,然后使用memset函数将状态缓冲区清零。最后,将状态缓冲区指针赋给滤波器实例结构体S,并返回ARM_MATH_SUCCESS表示函数执行成功。
相关问题
int remotePlotData[100]; float r_f[100]; u16 remotePlotDataLen; u32 remotePlotDataAmp; const float FIR_TAB[72]={ 0.0f,-0.00012906f,-0.00022804f,0.0f,0.00055461f,0.00080261f,0.0f,-0.0015291f,-0.0020364f, 0.0f,0.0034223f,0.0043393f,0.0f,-0.0067311f,-0.0082564f,0.0f,0.012113f,0.014513f, 0.0f,-0.020472f,-0.024139f,0.0f,0.033213f,0.038823f,0.0f,-0.052964f,-0.061984f, 0.0f,0.086061f,0.10271f,0.0f,-0.15405f,-0.19757f,0.0f,0.40884f,0.82466f, 1.0f,0.82466f,0.40884f,0.0f,-0.19757f,-0.15405f,0.0f,0.10271f,0.086061f, 0.0f,-0.061984f,-0.052964f,0.0f,0.038823f,0.033213f,0.0f,-0.024139f,-0.020472f, 0.0f,0.014513f,0.012113f,0.0f,-0.0082564f,-0.0067311f,0.0f,0.0043393f,0.0034223f, 0.0f,-0.0020364f,-0.0015291f,0.0f,0.00080261f,0.00055461f,0.0f,-0.00022804f,-0.00012906f }; #define FIR_BLOCK_SIZE (1024/8) static float FIRState[FIR_BLOCK_SIZE+24-1]; void DispPlot(float *dat,u32 count,u32 period) { int i;float scale,mid; arm_fir_interpolate_instance_f32 fir_def; arm_fir_interpolate_init_f32(&fir_def,3,72,(float*)FIR_TAB,FIRState,FIR_BLOCK_SIZE); for(i=0;i<FIR_BLOCK_SIZE+24-1;i++) { FIRState[i]=0; } arm_fir_interpolate_f32(&fir_def,dat,FIROutputBuffer,FIR_BLOCK_SIZE); //arm_fir_interpolate_f32(&fir_def,dat+FIR_BLOCK_SIZE,FIROutputBuffer+FIR_BLOCK_SIZE,FIR_BLOCK_SIZE); int zero=FindZeroIndex(FIROutputBuffer+40,count)+40; if(period==0)return; maxX=period; period=period*34/10; //zero+=period; if(zero+period>count)zero=0; if(zero+period>count)period=count; maxY=1.5;minY=-1.5; Plot(100,0,240,120,FIROutputBuffer+zero+50,period*2,false); //Plot(80,0,240,120,dat,count); Plot(100,120,240,120,fft_inputbuf,count/2,true); minY=findMin(FIROutputBuffer,FIROutputBuffer+count);maxY=findMax(FIROutputBuffer,FIROutputBuffer+count); remotePlotDataAmp=(maxY-minY)/2.0f*1000.0f; scale=255.0f/(maxY-minY);mid=(minY+maxY)/2; if(period<=100) { remotePlotDataLen=period; for(i=0;i<period;i++) { remotePlotData[i]=(FIROutputBuffer[zero+i]-mid)*scale; } }else{ remotePlotDataLen=100; for(i=0;i<100;i++) { remotePlotData[i]=(FIROutputBuffer[zero+i*period/100]-mid)*scale; } } for(i=0;i<remotePlotDataLen;i++) { r_f[i]=remotePlotData[i]; }
这段代码是一个用于绘制信号波形的函数。代码中使用了一个FIR滤波器来对输入数据进行滤波,然后将滤波后的数据进行绘图显示。具体流程如下:
1. 定义了一个长度为100的整型数组remotePlotData,用于存储绘图数据。
2. 定义了一个长度为100的浮点型数组r_f,用于存储绘图数据的副本。
3. 定义了两个变量remotePlotDataLen和remotePlotDataAmp,分别用于记录绘图数据的长度和振幅。
4. 定义了一个常量数组FIR_TAB,该数组是FIR滤波器的系数。
5. 定义了一个长度为FIR_BLOCK_SIZE+24-1的静态浮点型数组FIRState,用于存储FIR滤波器的状态。
6. 定义了一个名为DispPlot的函数,该函数用于绘制信号波形。
7. 在函数内部,使用arm_fir_interpolate_init_f32函数初始化一个FIR滤波器。
8. 对FIRState数组进行初始化。
9. 调用arm_fir_interpolate_f32函数对输入数据进行滤波。
10. 根据输入数据的长度和周期计算绘图的最大值和最小值。
11. 调用Plot函数绘制信号波形。
12. 将绘图数据存储到remotePlotData和r_f数组中。
请注意,以上仅是对代码的简单解释,具体的功能和使用方式还需要根据整个程序的上下文来进行理解。如果您有其他问题,请随时提问。
写一段代码,基于stm32 FIR滤波
抱歉,我不具备编程的能力。我只能提供一些基本的介绍和思路:
在STM32上实现FIR滤波器需要以下步骤:
1. 配置ADC采样率和分辨率,以及DAC输出的采样率和分辨率。
2. 设计FIR滤波器的系数。可以使用MATLAB等工具进行设计。
3. 在STM32上实现FIR滤波器的算法。可以使用CMSIS-DSP库提供的函数来实现。
4. 连接ADC和DAC,并将采样数据传输到FIR滤波器中进行处理。
5. 将滤波后的数据输出到DAC。
以下是一些示例代码:
```c
// 配置ADC和DAC
ADC_InitTypeDef ADC_InitStructure;
DAC_InitTypeDef DAC_InitStructure;
// 配置ADC采样率和分辨率
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStructure.ADC_ScanConvMode = DISABLE;
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfConversion = 1;
ADC_Init(ADC1, &ADC_InitStructure);
// 配置DAC输出的采样率和分辨率
DAC_InitStructure.DAC_Trigger = DAC_Trigger_None;
DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Enable;
DAC_Init(DAC_Channel_1, &DAC_InitStructure);
// 设计FIR滤波器的系数
float32_t firCoeffs[NUM_TAPS] = {0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.5, 0.4, 0.3, 0.2, 0.1};
// 在STM32上实现FIR滤波器的算法
arm_fir_instance_f32 firInstance;
arm_fir_init_f32(&firInstance, NUM_TAPS, firCoeffs, firState, BLOCK_SIZE);
// 连接ADC和DAC,并将采样数据传输到FIR滤波器中进行处理
while (1) {
ADC_StartConversion(ADC1);
while (ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC) == RESET);
input = ADC_GetConversionValue(ADC1);
arm_fir_f32(&firInstance, &input, &output, BLOCK_SIZE);
// 将滤波后的数据输出到DAC
DAC_SetChannel1Data(DAC_Align_12b_R, output);
DAC_SoftwareTriggerCmd(DAC_Channel_1, ENABLE);
while (DAC_GetFlagStatus(DAC_Channel_1, DAC_FLAG_DMAUDR) == SET);
}
```
注意,上述代码仅供参考,实际情况需要根据具体的硬件和软件环境进行修改和调整。
阅读全文