RTL9010 RTCT功能配置

RTCT即线缆诊断，在车载以太网使用上是一个必备的功能

一 手册解读

解释如下

涉及的相关寄存器

二 相关代码

s8 RTL9010AA_VA_CableFaultLocationAndDiagnosis(u16* cable_length){
	
	u32 mdio_data = 0;
	u16 cable_st;
	mdio_write(31, 0x0A42);    //PAGSR:change page to 0xA42
	mdio_write(17, 0x0001); //RTCTCR: bit0 = 1,rtct_en, enable RTCT and start to test

	while (mdio_data != 0x8000){   //RTCTCR: bit15 = 1, check RTCT is finished
		mdio_data = mdio_read(17);
		mdio_data = mdio_data & 0x8000;
	}
	//read channel status and cable length
	mdio_write(31, 0x0A43);    //write reg31,page select register
	mdio_write(27, 0x8022);    //PHYSRAD
	mdio_data = mdio_read(28);  //PHYSRD: this value means cable status
	cable_st = mdio_data & 0xFF00;

	//normal mode
	if (cable_st == 0x6000) {
		*cable_length = 0xFFFF; // Cable is normal.
		return CABLE_NORMAL;
	}
	//open mode
	if (cable_st == 0x4800){ 
			
		mdio_write(27, 0x8023);
		mdio_data = mdio_read(28);
		mdio_data = mdio_data * 2 / 15;
		*cable_length = (mdio_data & 0xFFFF);
		return CABLE_OPEN;
	}
	if (cable_st == 0x5000){
		return CABLE_SHORT;
	}
	
	return ERROR;
}