topic Re: imx6ull 怎么通过引脚输出1588 ptp 1s pps秒脉冲 in i.MX Processors

imx6ull 怎么通过引脚输出1588 ptp 1s pps秒脉冲

liuxin1111 — Wed, 24 Jan 2024 03:06:40 GMT

imx6ull 怎么通过引脚输出1588 ptp 1s pps秒脉冲？

通过查看imx6q那个贴子，尝试dts添加 MX6UL_PAD_GPIO1_IO01__ENET1_1588_EVENT0_OUT

修改了 drivers/net/ethernet/freescale/fec_ptp.c

-185,7 +185,8 @@ static int fec_ptp_enable_pps(struct fec_enet_private *fep, uint enable)
val |= (1 << FEC_T_TF_OFFSET | 1 << FEC_T_TIE_OFFSET);
val &= ~(1 << FEC_T_TDRE_OFFSET);
val &= ~(FEC_T_TMODE_MASK);
- val |= (FEC_HIGH_PULSE << FEC_T_TMODE_OFFSET);
+ //val |= (FEC_HIGH_PULSE << FEC_T_TMODE_OFFSET);
+ val |= (FEC_TMODE_TOGGLE << FEC_T_TMODE_OFFSET);

ptp4l -A -4 -H -m -i eth0 &

echo 1 > /sys/class/ptp/ptp0/pps_enable

并没有在gpio1_io1引脚上抓到任何输出，请给出回答，谢谢

Re: imx6ull 怎么通过引脚输出1588 ptp 1s pps秒脉冲

Bio_TICFSL — Thu, 25 Jan 2024 14:18:44 GMT

Hello,

As we talked offline, usually the following steps are required for pps test:

Add event0 out pin in dts: MX6UL_PAD_GPIO_19__ENET_1588_EVENT0_OUT
After kernel up, run commands:

ptp4l -A -4 -H -m -i eth0 &

echo 1 > /sys/class/ptp/ptp0/pps_enable

Use oscilloscope to capture the pps pin signal. Because the default BSP uses HIGH_PULSE setting, the pulse width is 8ns. You can try to change as TOGGLE mode for the test. It’s easy to capture signal with normal oscilloscope.

File: drivers/net/ethernet/freescale/fec_ptp.c

@@ -206,7 +208,7 @@ static int fec_ptp_enable_pps(struct fec_enet_private *fep, uint enable)
                val |= (1 << FEC_T_TF_OFFSET | 1 << FEC_T_TIE_OFFSET);
                val &= ~(1 << FEC_T_TDRE_OFFSET);
                val &= ~(FEC_T_TMODE_MASK);
-               val |= (FEC_HIGH_PULSE << FEC_T_TMODE_OFFSET);
+               val |= (FEC_TMODE_TOGGLE << FEC_T_TMODE_OFFSET);
                writel(val, fep->hwp + FEC_TCSR(fep->pps_channel));

Regards

Re: imx6ull 怎么通过引脚输出1588 ptp 1s pps秒脉冲

liuxin1111 — Fri, 26 Jan 2024 06:26:40 GMT

按照方法做的，不行，芯片是不是不支持呢我的芯片型号 i.MX6 Ultralite，是不是i.mx6ull可以，我这个不可以呢，芯片是否有这方面的差异，或者linux版本问题？