这是我弄的一个数据采集上传到电脑的程序,传到电脑的是乱码,不知是怎么回事,还有我不太清楚波特率的具体应用和要求,不知是不是波特率的问题,不知谁能指点一下.
#include <iom16v.h>
#define uchar unsigned char
#define uint unsigned int
#define BAUD 9600 //波特率采用9600bps
#define CRYSTAL 4000000 //系统时钟4MHz
//计算和定义波特率设置参数
#define BAUD_SETTING (unsigned int)((unsigned long)CRYSTAL/(16*(unsigned long)BAUD)-1)
#define BAUD_H (unsigned char)(BAUD_SETTING>>8)
#define BAUD_L (unsigned char)(BAUD_SETTING)
#define FRAMING_ERROR (1<<FE)
#define PARITY_ERROR (1<<PE)
#define DATA_OVERRUN (1<<DOR)
#define DATA_REGISTER_EMPTY (1<<UDRE)
uchar Table[10]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
uchar Data[4]={0,0,0,0};
void DelayMs(uint i) //0.25ms
{uchar j;
for(;i!=0;i--)
{for(j=250;j!=0;j--) {;}}
}
void Display(unsigned char *p) //间隔5ms显示
{uchar i,sel=0x10;
for(i=0;i<4;i++)
{PORTD=sel;
if(i==0)
{
PORTB=0xff-Table[p]+0x80;
}
else
PORTB=0xff-Table[p];
DelayMs(10);
sel=sel<<1;
}
}
uint ADC_Convert(void)
{uint temp1,temp2;
temp1=(uint)ADCL;
temp2=(uint)ADCH;
temp2=(temp2<<8)+temp1;
return(temp2);
}
void Process(uint i,uchar *p)
{unsigned char h;
p[0]=(uint)(((unsigned long)((unsigned long)i*5000))/1024)/1000;
h=(uint)(((unsigned long)((unsigned long)i*5000))/1024);
i=(uint)(((unsigned long)((unsigned long)i*5000))/1024)%1000;
p[1]=i/100;
i=i%100;
p[2]=i/10;
i=i%10;
p[3]=i;
}
void USART_Transmit(unsigned char data)
{
while (!(UCSRA & DATA_REGISTER_EMPTY)); // 等待发送寄存器空
UDR = data; // 发送数据
}
void main(void)
{uint i,h;
PORTD = 0x03; // TXD(PD1)输出
DDRD = 0x02; // RXD(PD0)输入,上拉有效
UCSRA = 0x00; // USART初始化
UCSRB=(1<<RXEN)|(1<<TXEN);//允许发送和接收
//UCSRB = 0x98；
UCSRC = (1<<URSEL)|(1<<UCSZ1)|(1<<UCSZ0); // 8 Data, 1 Stop, No Parity
UBRRH = BAUD_H; // 设置波特率
UBRRL = BAUD_L;
DDRA=0x00; //设置A口为不带上拉输入；
PORTA=0x00;
DDRB=0xff; //设置B口为推挽1输出；
PORTB=0xff;
DDRD=0xff; //设置C口为推挽1输出；
PORTD=0xff;
PORTB=0x00; //B口初始化输出1；C口初始化输出0；点亮全部数码管；
PORTD=0xff;
ADMUX=0x01; //选择第二通道ADC1；
ADCSR=0xe6; //125K转换速率，自由转换模式；启动AD转换器；
DelayMs(3000); //延时待系统稳定；
while(1)
{i=ADC_Convert();
Process(i,Data);
USART_Transmit(h);
Display(Data);
DelayMs(30000);
}
}
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