46-MDU32–乘法和除法单元，STC32G12K128实验箱演示程序，STC32G8K64,STC32CL8K64
46-MDU32–乘法和除法单元，STC32G12K128实验箱演示程序，STC32G8K64,STC32CL8K64主程序main.C代码如下（汇编版本在附件中）：
/*---------------------------------------------------------------------*/
/* --- Web: www.STCAI.com ---------------------------------------------*/
/* --- BBS: www.STCAIMCU.com-----------------------------------------*/
/* 如果要在程序中使用此代码,请在程序中注明使用了STC的资料及程序 */
/*---------------------------------------------------------------------*/
/*************功能说明 **************
本例程基于STC32G为主控芯片的实验箱进行编写测试。
使用Keil C251编译器，Memory Model推荐设置XSmall模式，默认定义变量在edata，单时钟存取访问速度快。
edata建议保留1K给堆栈使用，空间不够时可将大数组、不常用变量加xdata关键字定义到xdata空间。
通过汇编代码实现STC32硬件乘除法，替换标准算法库算法
串口2(115200,N,8,1)打印计算结果
可通过屏蔽"STC32_MDU32_V1.x.LIB"文件，用示波器测量IO口低电平时间，来对比STC32硬件乘除法单元与标准算法库的计算效率
测量计算时间时可将串口打印指令屏蔽，方便查看每条公式的计算时间
下载时, 默认时钟 24MHz (用户可自行修改频率).
******************************************/
#include "..\comm\STC32G.h"
#include "intrins.h"
#include "stdio.h"
#define MAIN_Fosc 24000000UL
volatileunsigned long int near uint1, uint2;
volatile unsigned long int near xuint;
volatile long int sint1, sint2;
volatile long int xsint;
unsigned long ultest;
long ltest;
/*****************************************************************************/
sbit TPIN=P5^0;
/*****************************************************************************/
#define Baudrate 115200L
#define TM (65536 -(MAIN_Fosc/Baudrate/4))
#define PrintUart 2 //1:printf 使用 UART1; 2:printf 使用 UART2
/******************** 串口打印函数 ********************/
void UartInit(void)
{
#if(PrintUart == 1)
SCON = (SCON & 0x3f) | 0x40;
T1x12 = 1; //定时器时钟1T模式
S1BRT = 0; //串口1选择定时器1为波特率发生器
TL1= TM;
TH1= TM>>8;
TR1 = 1; //定时器1开始计时
// SCON = (SCON & 0x3f) | 0x40;
// T2L= TM;
// T2H= TM>>8;
// AUXR |= 0x15; //串口1选择定时器2为波特率发生器
#else
S2_S = 1; //UART2 switch to: 0: P1.0 P1.1,1: P4.6 P4.7
S2CFG |= 0x01;//使用串口2时，W1位必需设置为1，否则可能会产生不可预期的错误
S2CON = (S2CON & 0x3f) | 0x40;
T2L= TM;
T2H= TM>>8;
AUXR |= 0x14; //定时器2时钟1T模式,开始计时
#endif
}
void UartPutc(unsigned char dat)
{
#if(PrintUart == 1)
SBUF = dat;
while(TI==0);
TI = 0;
#else
S2BUF= dat;
while(S2TI == 0);
S2TI = 0; //Clear Tx flag
#endif
}
char putchar(char c)
{
UartPutc(c);
return c;
}
void delay(unsigned char ms)
{
while(--ms);
}
/*****************************************************************************/
void main(void)
{
WTST = 0;//设置程序指令延时参数，赋值为0可将CPU执行指令的速度设置为最快
EAXFR = 1; //扩展寄存器(XFR)访问使能
CKCON = 0; //提高访问XRAM速度
P0M1 = 0x30; P0M0 = 0x30; //设置P0.4、P0.5为漏极开路(实验箱加了上拉电阻到3.3V)
P1M1 = 0x32; P1M0 = 0x32; //设置P1.1、P1.4、P1.5为漏极开路(实验箱加了上拉电阻到3.3V), P1.1在PWM当DAC电路通过电阻串联到P2.3
P2M1 = 0x3c; P2M0 = 0x3c; //设置P2.2~P2.5为漏极开路(实验箱加了上拉电阻到3.3V)
P3M1 = 0x50; P3M0 = 0x50; //设置P3.4、P3.6为漏极开路(实验箱加了上拉电阻到3.3V)
P4M1 = 0x3c; P4M0 = 0x3c; //设置P4.2~P4.5为漏极开路(实验箱加了上拉电阻到3.3V)
P5M1 = 0x0c; P5M0 = 0x0c; //设置P5.2、P5.3为漏极开路(实验箱加了上拉电阻到3.3V)
P6M1 = 0xff; P6M0 = 0xff; //设置为漏极开路(实验箱加了上拉电阻到3.3V)
P7M1 = 0x00; P7M0 = 0x00; //设置为准双向口
UartInit();
printf("STC32G MDU32 Test.\r\n");
TPIN = 0;//计算开始同步信号
delay(2);
TPIN = 1;
delay(2);
TPIN = 0;
delay(2);
TPIN = 1;
delay(2);
ultest = 12345678UL;
ltest = 12345678;
ultest = ultest / 12;
ltest = ltest / 12;
sint1 = 0x31030F05;
sint2 = 0x00401350;
TPIN = 0;
xsint = sint1 * sint2;
TPIN = 1;
printf("Result1=0x%x",xsint>>16);
printf("%x\r\n",xsint);
uint1 =5;
uint2 =50;
TPIN = 0;
xuint = uint1 * uint2;
TPIN = 1;
printf("Result2=%d\r\n",xuint);
uint1 = 654689;
uint2 = 528;
TPIN = 0;
xuint = uint1 / uint2;
TPIN = 1;
printf("Result3=%u\r\n",xuint);
sint1 = 2134135177;
sint2 = 20000;
TPIN = 0;
xsint = sint1 / sint2;
TPIN = 1;
printf("Result4=0x%x",xsint>>16);
printf("%x\r\n",xsint);
sint1 = -2134135177;
sint2 = -20000;
TPIN = 0;
xsint = sint1 / sint2;
TPIN = 1;
printf("Result5=0x%x",xsint>>16);
printf("%x\r\n",xsint);
sint1 = 2134135177;
sint2 = -20000;
TPIN = 0;
xsint = sint1 / sint2;
TPIN = 1;
printf("Result6=0x%x",xsint>>16);
printf("%x\r\n",xsint);
while(1);
}
/*****************************************************************************/
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