第8章示波器设计—测量功能

二代示波器测量功能实现比较简单，使用2D函数绘制即可。不过也专门开辟一个章节，为大家做一个简单的说明，方便理解。

8.1 水平测量功能

8.2 垂直测量功能

8.3 总结

8.1 水平测量功能

水平测量方式的效果如下：

水平测量功能的数据显示不要以窗口的形式呈现，因为将窗口显示在波形显示区上会造成波形刷新慢。当前的方案是在绘制完毕波形后，直接2D函数绘制测量窗口，这种方式的实际效果好很多。对应的代码如下：

/***********************************************************************************************************    函 数 名: DSO_DrawCursorH*    功能说明: 绘制示波器的水平测量游标，用于测量幅值。*    形    参: 无          *    返 回 值: 无**********************************************************************************************************/void DSO_DrawCursorH(void){char buf[60];/* 第1步：绘制用于测量的两个游标线********************************************************/GUI_SetColor(0x0040f0);/* 绘制横线A */GUI_DrawHLine(g_Cursors->sCursorHA, DSOSCREEN_STARTX, DSOSCREEN_ENDX);GUI_DrawHLine(g_Cursors->sCursorHA+1, DSOSCREEN_STARTX, DSOSCREEN_ENDX); GUI_FillRoundedRect(50, g_Cursors->sCursorHA+3, 61, g_Cursors->sCursorHA+18, 3);/* 绘制横线B */GUI_DrawHLine(g_Cursors->sCursorHB, DSOSCREEN_STARTX, DSOSCREEN_ENDX);GUI_DrawHLine(g_Cursors->sCursorHB-1, DSOSCREEN_STARTX, DSOSCREEN_ENDX); GUI_FillRoundedRect(50, g_Cursors->sCursorHB-18, 61, g_Cursors->sCursorHB-3, 3);/* 在横线A和横线B旁边的小圆圈中显示字母a和字母b */GUI_SetColor(GUI_BLACK);GUI_SetFont(&GUI_Font20_ASCII);GUI_SetTextMode(GUI_TEXTMODE_TRANS);                   GUI_DispCharAt('a', 51, g_Cursors->sCursorHA);GUI_DispCharAt('b', 51, g_Cursors->sCursorHB-19);/* 第2步：绘制游标数据显示窗口********************************************************/GUI_SetColor(GUI_BLACK);GUI_FillRoundedRect(500, 55, 635, 135, 4);GUI_SetColor(GUI_WHITE);GUI_DrawRoundedRect( 499, 54, 636, 136, 4);GUI_SetColor(0x0040f0);GUI_FillRoundedRect(75 + 433 , 47 + 15, 86 + 433, 62 + 15, 3);                GUI_FillRoundedRect(75 + 433 , 45 + 45, 86 + 433, 60 + 45, 3);GUI_SetColor(GUI_BLACK);GUI_SetFont(&GUI_Font20_1);GUI_SetTextMode(GUI_TEXTMODE_TRANS);                   GUI_DispCharAt('a', 509, 59);GUI_DispCharAt('b', 509, 88);GUI_SetColor(GUI_YELLOW);GUI_SetFont(&GUI_Font16_1);GUI_DispCharAt('#', 511, 115);/* 第3步：计算竖线线A的数值***********************************************************/g_Cursors->WaveCursorA = (float)((g_Cursors->sCursorVA - 340) * g_CursorUintTable[TimeBaseId][0])/1000;if(g_CursorUintTable[TimeBaseId][1] == 1){sprintf(buf, "%5.1fus", g_Cursors->WaveCursorA);}else if(g_CursorUintTable[TimeBaseId][1] == 2){sprintf(buf, "%5.3fms", g_Cursors->WaveCursorA);}else if(g_CursorUintTable[TimeBaseId][1] == 3){sprintf(buf, "%5.2fms", g_Cursors->WaveCursorA);}else if(g_CursorUintTable[TimeBaseId][1] == 4){sprintf(buf, "%5.1fms", g_Cursors->WaveCursorA);}else if(g_CursorUintTable[TimeBaseId][1] == 5){sprintf(buf, "%5.3fs", g_Cursors->WaveCursorA);}else if(g_CursorUintTable[TimeBaseId][1] == 6){sprintf(buf, "%5.2fs", g_Cursors->WaveCursorA);}else if(g_CursorUintTable[TimeBaseId][1] == 7){sprintf(buf, "%5.1fs", g_Cursors->WaveCursorA);}GUI_DispStringAt(buf, 523, 63);/* 第3步：计算竖线线B的数值***********************************************************/g_Cursors->WaveCursorB = (float)((g_Cursors->sCursorVB - 340) * g_CursorUintTable[TimeBaseId][0])/1000;if(g_CursorUintTable[TimeBaseId][1] == 1){sprintf(buf, "%5.1fus", g_Cursors->WaveCursorB);}else if(g_CursorUintTable[TimeBaseId][1] == 2){sprintf(buf, "%5.3fms", g_Cursors->WaveCursorB);}else if(g_CursorUintTable[TimeBaseId][1] == 3){sprintf(buf, "%5.2fms", g_Cursors->WaveCursorB);}else if(g_CursorUintTable[TimeBaseId][1] == 4){sprintf(buf, "%5.1fms", g_Cursors->WaveCursorB);}else if(g_CursorUintTable[TimeBaseId][1] == 5){sprintf(buf, "%5.3fs", g_Cursors->WaveCursorB);}else if(g_CursorUintTable[TimeBaseId][1] == 6){sprintf(buf, "%5.2fs", g_Cursors->WaveCursorB);}else if(g_CursorUintTable[TimeBaseId][1] == 7){sprintf(buf, "%5.1fs", g_Cursors->WaveCursorB);}GUI_DispStringAt(buf, 523, 91);/* 第5步：计算竖线A竖线B的差值***********************************************************/if(g_CursorUintTable[TimeBaseId][1] == 1){sprintf(buf, "%5.1fus", (g_Cursors->WaveCursorB - g_Cursors->WaveCursorA));}else if(g_CursorUintTable[TimeBaseId][1] == 2){sprintf(buf, "%5.3fms", (g_Cursors->WaveCursorB - g_Cursors->WaveCursorA));}else if(g_CursorUintTable[TimeBaseId][1] == 3){sprintf(buf, "%5.2fms", (g_Cursors->WaveCursorB - g_Cursors->WaveCursorA));}else if(g_CursorUintTable[TimeBaseId][1] == 4){sprintf(buf, "%5.1fms", (g_Cursors->WaveCursorB - g_Cursors->WaveCursorA));}else if(g_CursorUintTable[TimeBaseId][1] == 5){sprintf(buf, "%5.3fs", (g_Cursors->WaveCursorB - g_Cursors->WaveCursorA));}else if(g_CursorUintTable[TimeBaseId][1] == 6){sprintf(buf, "%5.2fs", (g_Cursors->WaveCursorB - g_Cursors->WaveCursorA));}else if(g_CursorUintTable[TimeBaseId][1] == 7){sprintf(buf, "%5.1fs",(g_Cursors->WaveCursorB - g_Cursors->WaveCursorA));}GUI_DispStringAt(buf, 523, 115);/* 第6步：显示水平线的计算数值***********************************************************/GUI_DispCharAt('#', 509+72, 115);g_Cursors->WaveCursorA = (float)((240 - g_Cursors->sCursorHA) * g_AttTable[Ch1AmpId][1]) / 50000;sprintf(buf, "%5.3fV", g_Cursors->WaveCursorA);GUI_DispStringAt(buf, 518+72, 63);g_Cursors->WaveCursorB = (float)((240 - g_Cursors->sCursorHB) * g_AttTable[Ch1AmpId][1]) / 50000;sprintf(buf, "%5.3fV", g_Cursors->WaveCursorB);   GUI_DispStringAt(buf, 518+70, 91);sprintf(buf, "%5.3fV", g_Cursors->WaveCursorA - g_Cursors->WaveCursorB);GUI_DispStringAt(buf, 520+70, 115);}

水平测量的实现比较简单，就是2D函数调用和字符显示。如果大家要自己实现，按照代码中注释的步骤制作即可。测量功能的调节是通过开发板上面的摇杆实现的。

8.2 垂直测量功能

垂直测量方式的效果如下：

垂直测量功能的数据显示不要以窗口的形式呈现，因为将窗口显示在波形显示区上会造成波形刷新慢。当前的方案是在绘制完毕波形后，直接2D函数绘制测量窗口，这种方式的实际效果好很多。对应的代码如下：

/***********************************************************************************************************    函 数 名: DSO_DrawCursorV*    功能说明: 绘制示波器的垂直测量游标，用于测量的时间。*    形    参: 无          *    返 回 值: 无**********************************************************************************************************/void DSO_DrawCursorV(void){char buf[60];/* 第1步：绘制用于测量的两个游标线********************************************************/GUI_SetColor(0x0040f0);/* 绘制竖线A */GUI_DrawVLine(g_Cursors->sCursorVA, DSOSCREEN_STARTY, DSOSCREEN_ENDY);GUI_DrawVLine(g_Cursors->sCursorVA+1, DSOSCREEN_STARTY, DSOSCREEN_ENDY); GUI_FillRoundedRect(g_Cursors->sCursorVA+5, 47, g_Cursors->sCursorVA+16, 62, 3);/* 绘制竖线B */GUI_DrawVLine(g_Cursors->sCursorVB, DSOSCREEN_STARTY, DSOSCREEN_ENDY);GUI_DrawVLine(g_Cursors->sCursorVB-1, DSOSCREEN_STARTY, DSOSCREEN_ENDY);GUI_FillRoundedRect(g_Cursors->sCursorVB-16, 47, g_Cursors->sCursorVB-5, 62, 3);/* 在竖线A和竖线B旁边的小圆圈中显示字母a和字母b */GUI_SetColor(GUI_BLACK);GUI_SetFont(&GUI_Font20_ASCII);GUI_SetTextMode(GUI_TEXTMODE_TRANS);                   GUI_DispCharAt('a', g_Cursors->sCursorVA+6, 44);GUI_DispCharAt('b', g_Cursors->sCursorVB-15, 45);/* 第2步：绘制游标数据显示窗口********************************************************/GUI_SetColor(GUI_BLACK);GUI_FillRoundedRect(500, 55, 635, 135, 4);GUI_SetColor(GUI_WHITE);GUI_DrawRoundedRect( 499, 54, 636, 136, 4);GUI_SetColor(0x0040f0);GUI_FillRoundedRect(75 + 433 , 47 + 15, 86 + 433, 62 + 15, 3);                GUI_FillRoundedRect(75 + 433 , 45 + 45, 86 + 433, 60 + 45, 3);GUI_SetColor(GUI_BLACK);GUI_SetFont(&GUI_Font20_1);GUI_SetTextMode(GUI_TEXTMODE_TRANS);                   GUI_DispCharAt('a', 509, 59);GUI_DispCharAt('b', 509, 88);GUI_SetColor(GUI_YELLOW);GUI_SetFont(&GUI_Font16_1);GUI_DispCharAt('#', 513, 115);/* 第3步：计算竖线A的数值***********************************************************/g_Cursors->WaveCursorA = (float)((g_Cursors->sCursorVA - 340) * g_CursorUintTable[TimeBaseId][0])/1000;if(g_CursorUintTable[TimeBaseId][1] == 1){sprintf(buf, "%5.1fus", g_Cursors->WaveCursorA);}else if(g_CursorUintTable[TimeBaseId][1] == 2){sprintf(buf, "%5.3fms", g_Cursors->WaveCursorA);}else if(g_CursorUintTable[TimeBaseId][1] == 3){sprintf(buf, "%5.2fms", g_Cursors->WaveCursorA);}else if(g_CursorUintTable[TimeBaseId][1] == 4){sprintf(buf, "%5.1fms", g_Cursors->WaveCursorA);}else if(g_CursorUintTable[TimeBaseId][1] == 5){sprintf(buf, "%5.3fs", g_Cursors->WaveCursorA);}else if(g_CursorUintTable[TimeBaseId][1] == 6){sprintf(buf, "%5.2fs",g_Cursors->WaveCursorA);}else if(g_CursorUintTable[TimeBaseId][1] == 7){sprintf(buf, "%5.1fs", g_Cursors->WaveCursorA);}/* 显示竖线A数值 */GUI_DispStringAt(buf, 523, 63);/* 第4步：计算竖线B的数值***********************************************************/g_Cursors->WaveCursorB = (float)((g_Cursors->sCursorVB - 340) * g_CursorUintTable[TimeBaseId][0])/1000;if(g_CursorUintTable[TimeBaseId][1] == 1){sprintf(buf, "%5.1fus", g_Cursors->WaveCursorB);}else if(g_CursorUintTable[TimeBaseId][1] == 2){sprintf(buf, "%5.3fms", g_Cursors->WaveCursorB);}else if(g_CursorUintTable[TimeBaseId][1] == 3){sprintf(buf, "%5.2fms", g_Cursors->WaveCursorB);}else if(g_CursorUintTable[TimeBaseId][1] == 4){sprintf(buf, "%5.1fms", g_Cursors->WaveCursorB);}else if(g_CursorUintTable[TimeBaseId][1] == 5){sprintf(buf, "%5.3fs", g_Cursors->WaveCursorB);}else if(g_CursorUintTable[TimeBaseId][1] == 6){sprintf(buf, "%5.2fs", g_Cursors->WaveCursorB);}else if(g_CursorUintTable[TimeBaseId][1] == 7){sprintf(buf, "%5.1fs", g_Cursors->WaveCursorB);}/* 显示竖线B数值 */GUI_DispStringAt(buf, 523, 91);/* 第5步：计算竖线A竖线B的差值***********************************************************/if(g_CursorUintTable[TimeBaseId][1] == 1){sprintf(buf, "%5.1fus", (g_Cursors->WaveCursorB - g_Cursors->WaveCursorA));}else if(g_CursorUintTable[TimeBaseId][1] == 2){sprintf(buf, "%5.3fms", (g_Cursors->WaveCursorB - g_Cursors->WaveCursorA));}else if(g_CursorUintTable[TimeBaseId][1] == 3){sprintf(buf, "%5.2fms", (g_Cursors->WaveCursorB - g_Cursors->WaveCursorA));}else if(g_CursorUintTable[TimeBaseId][1] == 4){sprintf(buf, "%5.1fms", (g_Cursors->WaveCursorB - g_Cursors->WaveCursorA));}else if(g_CursorUintTable[TimeBaseId][1] == 5){sprintf(buf, "%5.3fs", (g_Cursors->WaveCursorB - g_Cursors->WaveCursorA));}else if(g_CursorUintTable[TimeBaseId][1] == 6){sprintf(buf, "%5.2fs", (g_Cursors->WaveCursorB - g_Cursors->WaveCursorA));}else if(g_CursorUintTable[TimeBaseId][1] == 7){sprintf(buf, "%5.1fs",(g_Cursors->WaveCursorB - g_Cursors->WaveCursorA));}/* 显示竖线A和竖线B的差值 */GUI_DispStringAt(buf, 523, 115);/* 第6步：显示水平线的计算数值***********************************************************/GUI_DispCharAt('#', 509+72, 115);g_Cursors->WaveCursorA = (float)((240 - g_Cursors->sCursorHA) * g_AttTable[Ch1AmpId][1]) / 50000;sprintf(buf, "%5.3fV", g_Cursors->WaveCursorA);GUI_DispStringAt(buf, 518+72, 63);g_Cursors->WaveCursorB = (float)((240 - g_Cursors->sCursorHB) * g_AttTable[Ch1AmpId][1]) / 50000;sprintf(buf, "%5.3fV", g_Cursors->WaveCursorB);   GUI_DispStringAt(buf, 518+70, 91);sprintf(buf, "%5.3fV", g_Cursors->WaveCursorA - g_Cursors->WaveCursorB);GUI_DispStringAt(buf, 520+70, 115);}