并口示波器
虚拟示波器
这应该算是我第一次吧，刚出校门不久，老板赏识，给了一次难得的机会。。。。
从schàpcbà硬件调试à单片机程序，收获颇多。。。。
《第一版并口示波器》
第一版的板子，改动挺多的，运放都弄错了，7805功率也不够，换了一个金属壳的。。。。
反正不少问题。
《PCB图》
呵呵，看看当时的布线，走线中规中举横平竖直，这图是用trax画的，当时已经很少用这个画图的了，现在的小伙们可能都没听说过。
《原理图一》
《原理图二》
到现在看这款示波器的原理还是挺经典的，后面的逻辑部门全部用数字电路搭起来的，没用CPLD之类的芯片，AD
FIFO
都是挺经典的电路。图可能不是很清楚，感兴趣的可以联系我索要原理图。而且，这款示波器还是隔离的，市面上很少有隔离的虚拟示波器。。。。。
部分代码程序：
/* --10mV
|--20mV
|---50mV
|---100mV
幅度调整----|---200mV
|---500mV
|---1V
|---2V
---5V
---AC
AC/DC/GND---|---DC
---GND
*/
//YA幅度调整及AC/DC/GND控制
void Prefix_con_YA (unsigned char AC/DC/GND,unsigned char Voltage)
{
unsigned char control_reg_YA = 0x00;
switch(AC/DC/GND){
case 0 : control_reg_YA = control_reg_YA&0xDF; break;//AC
case 1 : control_reg_YA = control_reg_YA|0x20; break;//DC
case 2 : control_reg_YA = control_reg_YA&0x10|0x10;break;//GND
}
switch(Voltage){
case 0 : control_reg_YA = control_reg_YA&0xE0|0X04;break;//10mV
case 1 : control_reg_YA = control_reg_YA&0xE0|0X06;break;//20mV
case 2 : control_reg_YA = control_reg_YA&0xE0|0X05;break;//50mV
case 3 : control_reg_YA = control_reg_YA&0xE0|0X04;break;//100mV
case 4 : control_reg_YA = control_reg_YA&0xE0|0X0A;break;//200mV
case 5 : control_reg_YA = control_reg_YA&0xE0|0X09;break;//500mV
case 6 : control_reg_YA = control_reg_YA&0xE0|0X08;break;//1V???????
case 7 : control_reg_YA = control_reg_YA&0xE0|0X1A;break;//2V
case 8 : control_reg_YA = control_reg_YA&0xE0|0X19;break;//5V
}
write_74HCT574_U04(control_reg_YA);
}
//YB幅度调整及AC/DC/GND控制
void Prefix_con_YB (unsigned char AC/DC/GND,unsigned char Voltage)
{
unsigned char control_reg_YB = 0x00;
switch(AC/DC/GND){
case 0 : control_reg_YB = control_reg_YB&0xDF; break;//AC
case 1 : control_reg_YB = control_reg_YB|0x20; break;//DC
case 2 : control_reg_YB = control_reg_YB&0x10|0x10;break;//GND
}
switch(Voltage){
case 0 : control_reg_YB = control_reg_YB&0xE0|0X04;break;//10mV
case 1 : control_reg_YB = control_reg_YB&0xE0|0X06;break;//20mV
case 2 : control_reg_YB = control_reg_YB&0xE0|0X05;break;//50mV
case 3 : control_reg_YB = control_reg_YB&0xE0|0X04;break;//100mV
case 4 : control_reg_YB = control_reg_YB&0xE0|0X0A;break;//200mV
case 5 : control_reg_YB = control_reg_YB&0xE0|0X09;break;//500mV
case 6 : control_reg_YB = control_reg_YB&0xE0|0X08;break;//1V
case 7 : control_reg_YB = control_reg_YB&0xE0|0X1A;break;//2V
case 8 : control_reg_YB = control_reg_YB&0xE0|0X19;break;//5V
}
write_74HCT574_U05(control_reg_YB);
}
//YA偏移量控制,YB偏移量控制
void offset (unsigned int quantity)
{
//quantity = setbuf[2] + (setbuf[3]<<0x08) + (setbuf[4]<<0x10);
write_LT1446(quantity);
}
//时基控制
/* ---0.5us/0.2us--20M
|---1us/2us --10M
|---5us --2M
|---10us/20us --1M
|---50us --200K
|---0.1ms/0.2ms--100K
时基控制-|---0.5ms --20K
|---1ms/2ms --10K
|---5ms --2K
|---10ms/20ms --1K
|---50ms --200Hz
|---0.1s/0.2s --100Hz
|---0.5s --20Hz
|--- --10Hz
|--- --2Hz
--- --1Hz
*/
void time_base (unsigned char time)
{
switch(time){
case 0 : write_74HCT574_U31(0XF8);break;//20M
case 1 : write_74HCT574_U31(0XF9);break;//10M
case 2 : write_74HCT574_U31(0XFA);break;//2M
case 3 : write_74HCT574_U31(0XFB);break;//1M
case 4 : write_74HCT574_U31(0XFC);break;//200K
case 5 : write_74HCT574_U31(0XFD);break;//100K
case 6 : write_74HCT574_U31(0XFE);break;//20K
case 7 : write_74HCT574_U31(0XFF);break;//10K
case 8 : write_74HCT574_U31(0XF0);break;//2K
case 9 : write_74HCT574_U31(0XF1);break;//1K
case 10 : write_74HCT574_U31(0XF2);break;//200Hz
case 11 : write_74HCT574_U31(0XF3);break;//100Hz
case 12 : write_74HCT574_U31(0XF4);break;//20Hz
case 13 : write_74HCT574_U31(0XF5);break;//10Hz
case 14 : write_74HCT574_U31(0XF6);break;//2Hz
case 15 : write_74HCT574_U31(0XF7);break;//1Hz
}
}
//同步电平控制
void trig_level (unsigned char level)
{
//level = setbuf[6] + (setbuf[7]<<0x08);
write_LT1451(level);
}
//触发沿控制
void trig_pol (unsigned char pol)
{
switch(pol){
case 0 : write_74HCT574_U09(0XF7); break;//上升沿
case 1 : write_74HCT574_U09(0XF7); break;//下降沿
}
}
//同步源控制
void trig_fountain (unsigned char fountain)
{
switch(fountain){
case 0 : write_74HCT574_U09(0XF7); break;//YA同步
case 1 : write_74HCT574_U09(0XF7); break;//YB同步
case 2 : write_74HCT574_U09(0XF7); break;//外同步
}
}
//YA/YB选择
//停止/开始
void start_stop(unsigned char st)
{
switch(st){
case 0 : write_74HCT574_U09(0XF7); break;//停止
case 1 : write_74HCT574_U09(0XF7); break;//开始
}
}
//发送设置
void signal_setup()
{
//前置设置
switch(setbuf[0]){
case 0 : Prefix_con_YA (); break;//AC/10mV
case 1 : Prefix_con_YA (); break;//AC/20mV
case 3 : Prefix_con_YA (); break;//AC/50mV
case 4 : Prefix_con_YA (); break;//AC/100mV
case 5 : Prefix_con_YA (); break;//AC/200mV
case 6 : Prefix_con_YA (); break;//AC/500mV
case 7 : Prefix_con_YA (); break;//AC/1V
case 8 : Prefix_con_YA (); break;//AC/2V
case 9 : Prefix_con_YA (); break;//AC/5V
case 2 : Prefix_con_YA (); break;//AC/50mV
}
}
下面是当时市面存在的比较经典的虚拟示波器：
《普源并口示波器》
《迪阳并口示波器》
《汉泰USB示波器》
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