"TMS320C55x DSP Library DSPLIB Programmer's Reference"

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atan2_16Algorithm for (i 0; i nx; i ) z(i) x(i) y(i)Overflow Handling MethodologyScaling implemented for overflow prevention (User selectable)Special Requirements noneImplementation Notes noneExampleBenchmarksSee examples/add subdirectory(preliminary)Cycles † Core: 3 * nxOverhead: 23Code size(in bytes)60† Assumes all data is in on-chip dual-access RAM and that there is no bus conflict due to twiddletable reads and instruction fetches (provided linker command file reflects those conditions).atan2_16FunctionArctangent 2 Implementationushort oflag = atan2_16 (DATA *i, DATA *q, DATA *r, ushort nx)(defined in arct2.asm)Argumentsq[nx]i[nx]r[nx]nxoflagPointer to quadrature input vector of size nx.Pointer to in-phase input vector of size nxPointer to output data vector (in Q15 format) numberrepresentation of size nx containing. In-place processingallowed (r can be equal to x ) on output, r contains thearctangent of (q/I) /PINumber of elements of input and output vectors.Overflow flag. If oflag = 1, a 32-bit overflow has occurred If oflag = 0, a 32-bit overflow has not occurred4-10
atan16Description This function calculates the arctangent of the ratio q/I, where –1
Page 1 and 2: TMS320C55x DSP LibraryProgrammer’
Page 3 and 4: PrefaceRead This FirstAbout This Ma
Page 5: Contentsatan16 . . . . . . . . . .
Page 9 and 10: DSP Routines1.1 DSP RoutinesThe TI
Page 11 and 12: DSPLIB Content / How to Install DSP
Page 13 and 14: Chapter 3Using DSPLIBThis chapter d
Page 15 and 16: Calling a DSPLIB Function from C3.2
Page 17 and 18: Calling a DSPLIB Function from Asse
Page 19 and 20: How DSPLIB Deals with Overflow and
Page 21 and 22: Chapter 4Function DescriptionsThis
Page 23 and 24: DSPLIB Functions4.2 DSPLIB Function
Page 25 and 26: DSPLIB FunctionsTable 4-2. Summary
Page 27 and 28: acorracorrFunctionArgumentsAutocorr
Page 29: addCycles †Code size(in bytes)Aub
Page 33 and 34: expbexpFunctionBlock Exponent Imple
Page 35 and 36: cfftBenchmarks(preliminary)Cycles
Page 37 and 38: cfirCFFT - NOSCALEFFT Size Cycles
Page 39 and 40: cfirImplementation Notes The first
Page 41 and 42: cifftcifftFunctionInverse Complex F
Page 43 and 44: convolCIFFT - NOSCALEFFT Size Cycle
Page 45 and 46: convol1Figure 4-6. h Array in Memor
Page 47 and 48: convol2Figure 4-8. r Array in Memor
Page 49 and 50: convol2Figure 4-10. x Array in Memo
Page 51 and 52: dlmsImplementation NotesSpecial deb
Page 53 and 54: expnImplementation NotesDelayed ver
Page 55 and 56: firr[nx]Pointer to output vector of
Page 57 and 58: fir2Figure 4-14. x Array in Memoryo
Page 59 and 60: fir2Special Requirementsnh must be
Page 61 and 62: firdecr[nx/D]dbuffer[nh+1]nxnhDofla
Page 63 and 64: firinterpIoflagInterpolation factor
Page 65 and 66: firlatpbuffer [nh]nxnhoflagDelay bu
Page 67 and 68: firsnh2oflagHalf the number of coef
Page 69 and 70: fltoq15Figure 4-21. r Array in Memo
Page 71 and 72: hilb16dbuffer[nh + 2] Pointer to de
Page 73 and 74: iir32Figure 4-23. x Array in Memory
Page 75 and 76: iir32In the case of multiple-buffer
Page 77 and 78: iircas4nxoflagNumber of elements of
Page 79 and 80: iircas51This function retains the a
Page 81 and 82:
iirlatBenchmarks(preliminary)Cycles
Page 83 and 84:
ldiv16ldiv16Function32-bit by 16-bi
Page 85 and 86:
log_10Special Requirements noneImpl
Page 87 and 88:
lognThe coefficients Bi used in the
Page 89 and 90:
maxidxmaxidxFunctionIndex of the Ma
Page 91 and 92:
maxvecDescription Returns the maxim
Page 93 and 94:
minvecminvalFunctionMinimum Value o
Page 95 and 96:
mmulDescriptionAlgorithmThis functi
Page 97 and 98:
negr[nx]Pointer to output data vect
Page 99 and 100:
powernxoflagNumber of elements of i
Page 101 and 102:
and16AlgorithmNot applicableOverflo
Page 103 and 104:
and16initBenchmarksCycles Core: 13
Page 105 and 106:
fftThe initial estimate can be obta
Page 107 and 108:
ifftrifftFunctionInverse Real FFT (
Page 109 and 110:
sqrt_16DescriptionComputes the sine
Page 111 and 112:
subr[nx]nxscaleoflagPointer to outp
Page 113 and 114:
What DSPLIB Benchmarks are Provided
Page 115 and 116:
DSPLIB Software Updates6.1 DSPLIB S
Page 117 and 118:
Q3.12 Format / Q.15 Format / Q.31 F
Page 119 and 120:
Calculating the Reciprocal of a Q15
Page 121 and 122:
IndexIndex16-bit reciprocal functio
Page 123:
Indexmmul 4-74mtrans 4-76mul32 4-76
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