fft.asm

在CCS环境中开发的应用于tms320vc5402的频谱分析程序,仿真过,结果正确.

             .data
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             .word   7989h
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             .word   7ce2h
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  	     .bss temp_flag,1
 	     .bss test_val,1
 	     .bss temp_ar5,1
             .bss temp_ar3,1                                
             .bss input_cnt,1                           ;input counter   
             .bss output_cnt,1                           ;output counter   
             .bss d_grps_cnt,1                          ;group counter
             .bss d_twid_idx,1                          ;index of twiddle table
             .bss d_data_idx,1                          ;index of input data

              
      .mmregs
      

      .asg AR1,FFT_TWID_P
      .asg AR2,REORDERED_DATA                  ;pointer to processed data in bit_reversed order
      .asg AR3,ORIGINAL_INPUT                  ;pointer to original input data in natural order
      .asg ar4,d_input_backup
      .asg ar5,OUTPUT_BUF
      .asg AR7,DATA_PROC_BUF                   ;starting addressing of data processing buffer


      .global _main,process
      .text

_main: 

      ld #temp_flag,dp 
      st #0,input_cnt
      st #d_input_addr,temp_ar3	  		 	; store