emac_reset / EMAC_SW_RST not working
Posted: Wed Oct 28, 2020 6:27 am
esp-idf v3.3
My custom ESP32 board uses a LAN8720.
Over the past year I had many of them fail, so I'm trying to determine the root cause (I already have 50Mhz clock start delay and TVS ESD protection).
In esp_err_t emac_reset(void)
It calls
REG_SET_BIT(EMAC_DMABUSMODE_REG, EMAC_SW_RST)
However one of my boards always fails to reset this value back to zero0 (can't EMAC_SW_RST.
This of course means that any ethernet LAN8720 init will terminate prematurely leading to no MAC/no PHY.
Any particular hardware/software thing I can look into?
My custom ESP32 board uses a LAN8720.
Over the past year I had many of them fail, so I'm trying to determine the root cause (I already have 50Mhz clock start delay and TVS ESD protection).
In esp_err_t emac_reset(void)
It calls
REG_SET_BIT(EMAC_DMABUSMODE_REG, EMAC_SW_RST)
However one of my boards always fails to reset this value back to zero0 (can't EMAC_SW_RST.
This of course means that any ethernet LAN8720 init will terminate prematurely leading to no MAC/no PHY.
Any particular hardware/software thing I can look into?