求一个STC15W4K单片机程序的分析 -

#include "STC15W4K.H"
#include "intrins.h"
#include "LCD12864.h"
#define MAIN_Fosc 24000000L //定义主时钟
#define SDO 0x02
#define ADS7950_SCLK_HIGH P10=1
#define ADS7950_SCLK_LOW P10=0
#define ADS7950_SDI_HIGH P12=1
#define ADS7950_SDI_LOW P12=0
#define ADS7950_CS_HIGH P13=1
#define ADS7950_CS_LOW P13=0
#define ADS7950_IN P1
#define MODE_MANUAL_CH0 0x1800
#define MODE_MANUAL_CH1 0x1880
#define MODE_MANUAL_CH2 0x1900
#define MODE_MANUAL_CH3 0x1980
//extern u32 s;
u16 s=0;
u8 k;
//void ADS7950_PORT_Init();
void delay_us(u16 us);
unsigned char i;
unsigned char key_Pressed;
unsigned char key_val=0;
unsigned char key_flag;
unsigned char LCD_First_Line0[] ={"日期: 2015:10:30"};
unsigned char LCD_Second_Line0[] ={"时间: 10:30:00"};
unsigned char LCD_third_Line0[] ={"电压: V "};
unsigned char LCD_fourth_Line[] ={"矩阵按键: "};
void LCD_Display_Fresh(void);
void LCDInit(void);
sbit press_flag1= P4^4;
sbit press_flag2= P4^5;
sbit press_flag3= P4^6;
sbit press_flag4= P4^7;
unsigned int ADS7950_ReadResultAndSetNextSample(unsigned int uiSendData);
void main(void)
{
u8 num;
volatile unsigned int spi_result;
volatile unsigned int sample_result;
//volatile unsigned int sample_channel[11];
volatile unsigned long int voltage;
//unsigned char times;
// volatile unsigned int ok_times,error_times;
P0M1 = 0; P0M0 = 0; //设置为准双向口
P1M1 = 0; P1M0 = 0; //设置为准双向口
P2M1 = 0; P2M0 = 0; //设置为准双向口
P3M1 = 0; P3M0 = 0; //设置为准双向口
P4M1 = 0; P4M0 = 0; //设置为准双向口
P5M1 = 0; P5M0 = 0; //设置为准双向口
P6M1 = 0; P6M0 = 0; //设置为准双向口
P7M1 = 0; P7M0 = 0; //设置为准双向口
P6 |= 0xf0;
spi_result = ADS7950_ReadResultAndSetNextSample(MODE_MANUAL_CH2);
LCDInit();
while(1)
{
Key_Event();
spi_result = ADS7950_ReadResultAndSetNextSample(MODE_MANUAL_CH2);
sample_result = spi_result & 0xFFF;
delay_us(10);
//voltage[times] = sample_result[times]*2500/4096 //--->2500/4096=0.610
voltage = sample_result*(unsigned long int)610/1000; //mV
delay_us(500);
//num++;
//if(num==100)
//{
// num=0;
//s=voltage; //模式1
s=voltage*2; //模式2
//}
LCD_Display_Fresh();
}
}
/* Simulate SPI Read and Write ADS7950;
*
* SDO--The first bit clocks out at the falling edge of CS;
* --next 15 bits clocks out at the falling edge of SCLK;
* SDI--latch data on the rising edge of SCLK;
*
* */
unsigned int ADS7950_ReadResultAndSetNextSample(unsigned int uiSendData)
{
unsigned int uiSendTimes,result;
result=0;
ADS7950_CS_HIGH;
ADS7950_SCLK_LOW;
delay_us(50); //__delay_cycles(30);//delay 20ns at least
ADS7950_CS_LOW;
delay_us(50); //__delay_cycles(30);//delay 40ns at least for the first SDO
for(uiSendTimes=16;uiSendTimes>0;uiSendTimes--) //读16次数据
{
//prepare one bit to send
if((uiSendData & 0x8000)== 0x8000) ADS7950_SDI_HIGH; //输入第一位
else ADS7950_SDI_LOW;
uiSendData <<=1;
//read one bit
result<<=1;
if(( ADS7950_IN & SDO)== SDO) result |= 0x0001;
//delay 20ns at least to set sclk high
delay_us(50); //__delay_cycles(50);
ADS7950_SCLK_HIGH; //rising edge of SCLK, latch one bit
delay_us(50);
ADS7950_SCLK_LOW; //falling edge of SCLK, SDO clocks on one bit
delay_us(50);
}
ADS7950_CS_HIGH;
return result;
}
void LCD_Display_Fresh(void)
{
LCD_Position(1,0); // "日期:"
for(i=0;i<16;i++)
{
WriteDataLCD(LCD_First_Line0[i]);
}
LCD_Position(2,0); // Set second line display
for(i=0;i<16;i++) // "时间:"
{
WriteDataLCD(LCD_Second_Line0[i]);
}
LCD_Position(3,0);
for(i=0;i<6;i++)
{
WriteDataLCD(LCD_third_Line0[i]);
}
WriteDataLCD(0x30+s/1000%10);
WriteDataLCD(0x20+0x0E);
WriteDataLCD(0x30+s/100%10);
WriteDataLCD(0x30+s/10%10);
WriteDataLCD(0x30+s%10);
for(i=12;i<16;i++)
{
WriteDataLCD(LCD_third_Line0[i]);
}
LCD_Position(4,0);
for(i=0;i<10;i++)
{
WriteDataLCD(LCD_fourth_Line[i]);
}
WriteDataLCD(0x30+key_val/10);
WriteDataLCD(0x30+key_val%10);
//WriteDataLCD(0x30+ KeyCode/10);
//WriteDataLCD(0x30+ KeyCode%10);
for(i=13;i<16;i++)
{
WriteDataLCD(LCD_fourth_Line[i]);
}
delay_us(2000);
}
//========================================================================
// 函数:void delay_us(u16 us)
// 描述: 延时函数。
// 参数: 自动适应主时钟.
// 返回: none.
// 版本: VER1.0
// 日期:
// 备注:
//========================================================================
void delay_us(u16 us)
{
u16 i;
do{
i = MAIN_Fosc / 13000000;
while(--i) ; //14T per loop
}while(--us);
}

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