——来自迪文开发者论坛
本期为大家推送迪文开发者论坛获奖开源案例——基于T5L的汽车抬头显示器方案。该方案采用COF智能屏，通过T5L CAN接口，实时获取汽车OBDII诊断接口的数据，并将接收到的车速和转速数据同步显示在屏幕上，为驾驶员在行车过程中提供直观、便捷的视觉辅助。
【演示视频】
视频由论坛工程师实拍提供
完整开发资料含迪文屏DGUS工程资料与C51代码，获取方式：
1. 前往迪文开发者论坛获取：http://inforum.dwin.com.cn:20080/forum.php?mod=viewthread&tid=10904&extra=&_dsign=d701329d
2. 微信公众号中回复“汽车抬头显示器”获取。
【UI素材展示】
【GUI工程设计】
【程序代码设计】
通过T5L CAN接口，获取车速和转速数据，部分参考代码如下：
void main(void)
{
T5LInit();
T0_Init(); // 定时器0初始化
EA = 1;
//等待上电稳定
TimerExtDelayMs(2000);
GaugeViewInit();
while (1)
{
//obdii系统进入识别
if (ObdiiSysEnter())
{
break;
}
}
//HUD功能主入口
GaugeViewFunc();
}
void GaugeViewFunc(void)
{
uint8_t rawDataBuff[256];
uint8_t resultBuff[5];
float vehicleSpeed = 0;
float rotateSpeed = 0;
uint32_t tempData = 0;
while (1)
{
memset(rawDataBuff, 0, 256);
// 读取转速
if (ObdiiReadPid(rawDataBuff, 2, 0x01, 0x0C))
{
ObdiiLdsCalResult(0x0C, rawDataBuff, resultBuff);
tempData = resultBuff[3];
tempData = resultBuff[2] + (tempData << 8);
tempData = resultBuff[1] + (tempData << 8);
tempData = resultBuff[0] + (tempData << 8);
rotateSpeed = (float)tempData;
GaugeViewRotateSpeedSet(rotateSpeed);
}
memset(rawDataBuff, 0, 256);
// 读取车速
if (ObdiiReadPid(rawDataBuff, 2, 0x01, 0x0D))
{
ObdiiLdsCalResult(0x0D, rawDataBuff, resultBuff);
tempData = resultBuff[3];
tempData = resultBuff[2] + (tempData << 8);
tempData = resultBuff[1] + (tempData << 8);
tempData = resultBuff[0] + (tempData << 8);
vehicleSpeed = (float)tempData;
GaugeViewPointerSet((uint8_t)vehicleSpeed);
GaugeViewVehicleSpeedSet(vehicleSpeed);
}
}
}
void GaugeViewFunc(void)
{
uint8_t rawDataBuff[256];
uint8_t resultBuff[5];
float vehicleSpeed = 0;
float rotateSpeed = 0;
uint32_t tempData = 0;
while (1)
{
memset(rawDataBuff, 0, 256);
// 读取转速
if (ObdiiReadPid(rawDataBuff, 2, 0x01, 0x0C))
{
ObdiiLdsCalResult(0x0C, rawDataBuff, resultBuff);
tempData = resultBuff[3];
tempData = resultBuff[2] + (tempData << 8);
tempData = resultBuff[1] + (tempData << 8);
tempData = resultBuff[0] + (tempData << 8);
rotateSpeed = (float)tempData;
GaugeViewRotateSpeedSet(rotateSpeed);
}
memset(rawDataBuff, 0, 256);
// 读取车速
if (ObdiiReadPid(rawDataBuff, 2, 0x01, 0x0D))
{
ObdiiLdsCalResult(0x0D, rawDataBuff, resultBuff);
tempData = resultBuff[3];
tempData = resultBuff[2] + (tempData << 8);
tempData = resultBuff[1] + (tempData << 8);
tempData = resultBuff[0] + (tempData << 8);
vehicleSpeed = (float)tempData;
GaugeViewPointerSet((uint8_t)vehicleSpeed);
GaugeViewVehicleSpeedSet(vehicleSpeed);
}
}
}
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