“arith.inc”哪里可以找到

你好，
最近我尝试做一个程序以0°90°之间的角度控制伺服电机，我做的程序的主要代码在C，单片机读取通过引脚中断矩阵键盘给定字符（汇编代码，给出了等效性电子键盘，休息'0 '一）转换为数字的ASCII字符（0”现在是0为例）和一个新的10几万乘法和加单位（即“九0”液晶转换为9×10 0 = -90）。
程序工作得很好，但我需要rewritte程序汇编。没问题，PWM可中断是ASM，GPIO可中断，但主要是在我乘C C因为乘法。
我知道MAC的可行的PSoC 1但调查我发现柏称为“算术库用户指南”，描述了一个8位数字乘2的子程序文件（这正是我需要的因为我不使用符号int型对象和结果是8位也）但说我要写E线以下包括“算术。公司”，当我建立这个项目说，公司文件是不成立的。
我在哪里可以找到那个文件？我能做什么？
顺便说一句，在我看到像“mulx编译器的建议”，“muly”，我怎么能用乘法假设这样做。
问候语



     以下为原文
  Hi,
Recently i try to make a program to control a servomotor by giving an angle between 0° and 90°, i made the program with the main code in C where the microcontroller reads the caracter given by a matrix keyboard using pins interruptions (An assembler code which gives the equivalent character of the keyboard to A), rests '0' to convert the ASCII caracter into numbers ('0' now is 0 for example) and make a new number by multiplying by 10 the tens and adds the unit (i.e. '9''0' in LCD converts to 9*10+0 = 90).
The program works well, but i need to rewritte the program in assembler. No problem, the PWM interrups are in ASM, the GPIO interrups also, but the main.c where i multiply is in C because of the multiplications.
I know about the MAC aviable for the PSoC 1 but investigating i found a document from Cypress called "Arithmetic Libraries User Guide" where describes a subroutine that multiplies 2 8-bit numbers (just what i need because i don't use signed ints and the result is 8-bit also) but says i need to write the following line include "arith.inc", when i build the project says that inc file is not founded.

Where i can find that file? What i can do?
BTW, in the compiler i see suggestions like "MULX", "MULY", how i can use that to Multiply assuming that do this.

Greetings