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Discussion Groups | TMS320C54x | Using circular buffers on c54x dskplus
Technical discussions about the TI C54x DSPs (including the c5401, c5402, c5402a, c5404, c5407, c5409, c5409a, c5410, c5410a, c5416, c5420, c5421, c5441, c549, c5470 and c5471).
Using circular buffers on c54x dskplus - ching hor - Dec 5 22:33:00 2000
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Hi, I'm trying to implement a simple FIR filter using circular buffers on c54x dskplus. Below is my code modified from original c54x EVM code. The main problem of my code is there isn't any data stored in the fir_coff_table & d_data_buffer after execution. Can someone tell me what's wrong with my code. Appreciate if someone can correct my code. Thanks in advance. --------------------- program ------------------------------ .width 86 .length 55 .mmregs .setsect ".data", 0x400, 1 .setsect ".text", 0x1800, 0 .setsect "vectors", 0x180, 0 .setsect "coff_fir", 0x2700, 0 .sect "vectors" .copy "firvecs.asm" COFF_FIR_START .sect "coff_fir" .word 6Fh .word 0F3h .word 269h .word 50Dh .word 8A9h .word 0C99h .word 0FF8h .word 11EBh .word 11EBh .word 0FF8h .word 0C99h .word 8A9h .word 50Dh .word 269h .word 0F3h .word 6Fh COFF_FIR_END FIR_DP .usect "fir_vars", 0 fir_coff_table .usect "fir_coff", 20 .data d_data_buffer .word 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 .asg AR0, FIR_INDEX_P .asg AR4, FIR_DATA_P .asg AR5, FIR_COFF_P ;---------------- Main program ------------ .text start: SSBX INTM CALLD AC01INIT STM 1A0h, PMST STM 0FFAh, SP LD #0, DP STM 240h, IMR RSBX INTM NOP ;----- initialization --------- STM #fir_coff_table, FIR_COFF_P RPT #16-1 ;move FIR coeffs from program to data MVPD #COFF_FIR_START, *FIR_COFF_P+ STM #1, FIR_INDEX_P STM #(d_data_buffer+16-1), FIR_DATA_P STM #fir_coff_table, FIR_COFF_P WAIT B WAIT receive: LD #FIR_DP, DP STM #256-1, BRC RPTBD fir_filter_loop-1 LDM trcv, A STM #15, BK STL A, *FIR_DATA_P+% RPTZ A, 15 MAC *FIR_DATA_P+0%,*FIR_COFF_P+0%,A ; AND #0FFFCh,A STLM A, tdxr fir_filter_loop RETE transmit: RETE ;**************************************************** .copy "firinit.asm" .end |
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