TMS320C64x+ DSP Little-Endian Library Reference: Programmer's Guide

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本指南是针对TI TMS320C64x+ DSP（数字信号处理器）的Little-Endian DSP Library（DSPLIB）的专业程序员参考手册，发布日期为2006年3月，后经修订于2008年3月。该文档主要介绍了DSPLIB的设计、使用方法以及与TMS320C64x/C64x+系列DSP CPU架构、指令集和中断处理相关的背景知识。首先，DSPLIB是为TMS320C64x+ DSP平台定制的一套库，它针对的是Little-Endian数据存储格式，这是与Big-Endian模式相对的一种endianness，其中低位字节在内存中的地址较低。对于程序员而言，理解这种endianness对于高效编写针对该平台的代码至关重要，因为它影响到内存访问和数据处理的效率。文档中提到的"Hexadecimal numbers"部分强调了十六进制数的表示方式，例如40h表示十进制的64。此外，手册还采用图形化的方式展示寄存器，并在表格中提供详细描述，这有助于开发人员快速定位和理解硬件资源。与该指南相关的其他文档，如SPRU732—TMS320C64x/C64x+ DSP CPU and Instruction Set Reference Guide，深入探讨了TMS320C64x/C64x+ DSP系列的CPU架构、指令集特性以及中断管理。这部分内容对理解DSPLIB如何与CPU协作执行任务以及如何优化性能至关重要。这些文档的电子版可以在TI的官方网站上获取，只需在搜索框中输入文献编号即可。 TMS320C64x+ DSP Little-Endian DSP Library Programmer’s Reference是一份实用的资源，提供了DSPLIB的核心功能、编程指导和底层硬件的兼容性信息，对于开发人员设计、调试和优化针对TMS320C64x+ DSP平台的应用程序具有重要参考价值。

Using DSPLIB

2-4

2.2.2 Calling a DSPLIB Function From C

In addition to installing the DSPLIB software, follow these steps to include a DSPLIB function to the

code:

- Include the dsplib64plus.h header file

- Link the code with the dsplib64plus.lib

- Use a correct linker command file for the platform used

The source code and CCS project in the “c64plus\dsplib\example\” directory shows how to use the

DSPLIB in a Code Composer Studio C environment.

2.2.3 Calling a DSP Function From Assembly

The C64x+ DSPLIB functions were written to be used from C. Calling the functions from assembly

language source code is possible as long as the calling function conforms to the Texas

Instruments C64x+ C compiler calling conventions. For more information, see Section 8 (Runtime

Environment) of TMS320C6000 Optimizing C Compiler User’s Guide (SPRU187).

2.2.4 DSPLIB Testing − Allowable Error

DSPLIB is tested under the Code Composer Studio environment against a reference C

implementation. You can expect identical results between Reference C implementation and its

Optimized C implementation when using test routines that focus on fixed point type results.

2.2.5 DSPLIB Overflow and Scaling Issues

The DSPLIB functions implement the same functionality of the reference C code. You must

conform to the range requirements specified in the API function, and in addition, restrict the input

range so that the outputs do not overflow.

In FFT functions, twiddle factors are generated with a fixed scale factor; i.e., 32767(=2

15−1

) for all

16-bit FFT functions, 1073741823(=2

30−1

) for DSP_fft32x32s, 2147483647(=2

31−1

) for all other

32-bit FFT functions. Because DSP_fft16x16r and DSP_fft32x32s perform scaling by 2 at each

radix-4 stage, the input data must be scaled by 2

(log2(nx)−cei[log4(nx)−1])

to completely prevent

overflow. In all other FFT functions, the input data must be scaled by 2

(log2(nx))

because no scaling

is done by the functions.

Using DSPLIB

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