TI中文支持网大家好，最近遇到了HwaFFT无法实现1024点FFT算法的功能，这到底是为什么？各种方式几乎都尝试过了还是这样，是不是这个片子本身就是个错误。
希望有关TI的FAE能够帮忙解决一下问题，如果各位做过C55xxHwaFFT的朋友们能不吝赐教？
Tony Tang：
详细说下你是怎么做的？
是否有参考sprabb6b这篇文档.
join join：
回复 Tony Tang:
参考过
join join：
回复 Tony Tang:
1、CMD文件的配置，如下：
-stack 0x1000 /* PRIMARY STACK SIZE */-sysstack 0x1000 /* SECONDARY STACK SIZE */-heap 0x3F80 /* HEAP AREA SIZE */MEMORY{PAGE 0: MMR: o = 0x000000 l = 0x0000c0 /* 192B Memory Mapped Registers */ DARAM0: o = 0x0000C0 l = 0x001F40 /* 8kB Dual Access RAM 0 */ DARAM1: o = 0x002000 l = 0x006000 /* 8kB Dual Access RAM 1 */ DARAM2: o = 0x008000 l = 0x008000 /* 8kB Dual Access RAM 2 */ // DARAM3: o = 0x00C000 l = 0x002000 /* 8kB Dual Access RAM 5 */ // DARAM4: o = 0x00E000 l = 0x002000 /* 8kB Dual Access RAM 5 */PAGE 1: SARAM0: o = 0x010000 l = 0x002000 /* 8kB Single Access RAM 0 */ SARAM1: o = 0x012000 l = 0x002000 /* 8kB Single Access RAM 1 */ SARAM2: o = 0x014000 l = 0x002000 /* 8kB Single Access RAM 2 */ SARAM3: o = 0x016000 l = 0x002000 /* 8kB Single Access RAM 3 */ SARAM4: o = 0x018000 l = 0x004000 /* 8kB Single Access RAM 4 */ //SARAM5: o = 0x01A000 l = 0x002000 /* 8kB Single Access RAM 5 */ SARAM6: o = 0x01C000 l = 0x002000 /* 8kB Single Access RAM 6 */ SARAM7: o = 0x01E000 l = 0x002000 /* 8kB Single Access RAM 7 */ SARAM8: o = 0x020000 l = 0x002000 /* 8kB Single Access RAM 8 */ SARAM9: o = 0x022000 l = 0x002000 /* 8kB Single Access RAM 9 */ SARAM10: o = 0x024000 l = 0x002000 /* 8kB Single Access RAM 10 */ SARAM11: o = 0x026000 l = 0x002000 /* 8kB Single Access RAM 11 */ SARAM12: o = 0x028000 l = 0x002000 /* 8kB Single Access RAM 12 */ SARAM13: o = 0x02A000 l = 0x002000 /* 8kB Single Access RAM 13 */ SARAM14: o = 0x02C000 l = 0x002000 /* 8kB Single Access RAM 14 */ SARAM15: o = 0x02E000 l = 0x002000 /* 8kB Single Access RAM 15 */ SARAM16: o = 0x030000 l = 0x002000 /* 8kB Single Access RAM 16 */ SARAM17: o = 0x032000 l = 0x002000 /* 8kB Single Access RAM 17 */ SARAM18: o = 0x034000 l = 0x002000 /* 8kB Single Access RAM 18 */ SARAM19: o = 0x036000 l = 0x002000 /* 8kB Single Access RAM 19 */ SARAM20: o = 0x038000 l = 0x002000 /* 8kB Single Access RAM 20 */ SARAM21: o = 0x03A000 l = 0x002000 /* 8kB Single Access RAM 21 */ SARAM22: o = 0x03C000 l = 0x002000 /* 8kB Single Access RAM 22 */ SARAM23: o = 0x03E000 l = 0x002000 /* 8kB Single Access RAM 23 */ SARAM24: o = 0x040000 l = 0x002000 /* 8kB Single Access RAM 24 */ SARAM25: o = 0x042000 l = 0x002000 /* 8kB Single Access RAM 25 */ SARAM26: o = 0x044000 l = 0x002000 /* 8kB Single Access RAM 26 */ SARAM27: o = 0x046000 l = 0x002000 /* 8kB Single Access RAM 27 */ SARAM28: o = 0x048000 l = 0x002000 /* 8kB Single Access RAM 28 */ SARAM29: o = 0x04A000 l = 0x002000 /* 8kB Single Access RAM 29 */ SARAM30: o = 0x04C000 l = 0x002000 /* 8kB Single Access RAM 30 */ SARAM31: o = 0x04E000 l = 0x002000 /* 8kB Single Access RAM 31 */
CS0: o = 0x050000 l = 0x7B0000 /* 8MB CS0 external memory space */ CS2: o = 0x800000 l = 0x400000 /* 4MB CS2 external memory space */ CS3: o = 0xC00000 l = 0x200000 /* 2MB CS3 external memory space */ CS4: o = 0xE00000 l = 0x100000 /* 1MB CS4 external memory space */ CS5: o = 0xF00000 l = 0x0E0000 /* 1MB CS5 external memory space */ ROM: o = 0xFE0000 l = 0x01FE00 /* 128kB ROM (MPNMC=0) or CS5 (MPNMC=1) */ VECS: o = 0xFFFE00 l = 0x000200 /* reset vector */}
SECTIONS{ .vectors > VECS PAGE 1 /* If MPNMC = 1, remove the NOLOAD directive */ .cinit > DARAM0 PAGE 0 .text > DARAM1 PAGE 0 // .stack > SARAM0 PAGE 1 // .sysstack > SARAM3 PAGE 1 .sysmem > SARAM4 PAGE 1 .data > SARAM6 PAGE 1 .cio > DARAM0 PAGE 0 .bss > SARAM1 PAGE 1 .const > DARAM0 PAGE 0 .switch > DARAM0 PAGE 0 data_br_buf : > DARAM2 PAGE 0/* hwafft Output–bit-reversed data memory allocation */ data_buf : > DARAM2 PAGE 0/* hwafft Input/output static memory allocation */ scratch_buf : > DARAM2 PAGE 0 /* hwafft Intermediate/output static memory allocation */
//data_buf : >DARAM2 PAGE 0 //scratch_buf : >DARAM2 PAGE 0 //data_br_buf : >DARAM2 PAGE 0}/* HWAFFT Routines ROM Addresses *//* (PG 2.0) */_hwafft_br = 0x00ff6cd6;_hwafft_8pts = 0x00ff6cea;_hwafft_16pts = 0x00ff6dd9;_hwafft_32pts = 0x00ff6f2f;_hwafft_64pts = 0x00ff7238;_hwafft_128pts = 0x00ff73cd;_hwafft_256pts = 0x00ff75de;_hwafft_512pts = 0x00ff77dc;_hwafft_1024pts = 0x00ff7a56;
2、HWAFFT相关变量及函数的的定义，如下：
Int32 *data;Int32 *data_br;Uint16 fft_flag;Uint16 scale_flag;Int32 *scratch;Uint16 out_sel;Int32 *result;
#define ALIGNMENT 2*1024#pragma DATA_SECTION(data_buf, "data_buf");#pragma DATA_ALIGN (data_buf, ALIGNMENT);Int32 data_buf[1024];Int32 *data = data_buf;
#pragma DATA_SECTION(scratch_buf, "scratch_buf");#pragma DATA_ALIGN (scratch_buf, ALIGNMENT);Int32 scratch_buf[1024];Int32 *scratch =scratch_buf;
#pragma DATA_SECTION(data_br_buf, "data_br_buf");#pragma DATA_ALIGN (data_br_buf, ALIGNMENT);Int32 data_br_buf[1024];Int32 *data_br =data_br_buf;
void fft();
void fft(){ fft_flag = FFT_FLAG; scale_flag = SCALE_FLAG; data =data_buf; /* Bit-Reverse 1024-point data, Store into data_br, data_br aligned to 12-least significant binary zeros*/ hwafft_br(data, data_br, DATA_LEN_1024); /* bit-reverse input data, Destination buffer aligned */ //data = data_br; //memcpy(data_buf,data_br,sizeof(data_br_buf)); //data = data_buf; /* Compute 1024-point FFT, scaling enabled. */// out_sel = hwafft_1024pts(data_br, scratch, fft_flag, scale_flag); out_sel = hwafft_1024pts(data_br, scratch, fft_flag, scale_flag); if (out_sel == OUT_SEL_DATA) { result = data_br; }else { result = scratch; }}
3、主要代码如上，数据的接收及处理在SAR接收中断里处理：
interrupt void sarISR(void){
SAR_readData(SarHandle, &readBuffer[i]); // printf("SAR ADC read data 0x%x\n",readBuffer); data_buf[i]=readBuffer[i]; i++; if(i==1024){ fft(); i=0; }
4、外部给出正谐波信号，由SAR直接采集。通过观察输入数据，readBuffer[1024]接收正常。时钟配置PLL，sysclock=100MHZ.
join join：
回复 Tony Tang:
您看一下我做得过程，相关的代码都贴出来了
123 bai：
回复 join join:
你好，FFT你调通了吗？遇到同样的问题
