TMS570LS3137-EP: EMAC Data receive DMA

Subash Sundaresan1

Part Number: TMS570LS3137-EP
Other Parts Discussed in Thread: TMS570LS3137

We are developing EMAC driver in our project for TMS570ls3137 controller, for testing purpose we are using TMS570ls3137 Eval board. We have configured EMAC in MII mode, 100 Mbps ,full duplex and broadcast mode. If the Ethernet packet size is 2000 bytes and fragmented in 2 packets as 1500 bytes and 500 bytes. we didn't enable the Rx interrupt and how to poll from application software whether all the 2000 bytes have been received? we wanted to process the received data only after receiving all 2000 bytes.

Thanks,

Subash

over 3 years ago

0 QJ Wang over 3 years ago

TI__Guru**** 196496 points

Hi Sabash,

1. You can use the flag in RXINTSTATRAW register. The bit of EMAC receive interrupt status (unmasked) register (RXINTSTATRAW) is set whether or not the interrupt is enabled.

2. You can enable the EMAC interrupt (TX or RX), but disable the VIM to accept the interrupts from EMAC. So you can poll the flag in MACINVECTOR register

0 Subash Sundaresan1 over 3 years ago in reply to QJ Wang

Intellectual 560 points

Thank you so much QJ. Is there any way to monitor the DMA pointer (current DMA pointer position) in EMAC?

0 Subash Sundaresan1 over 3 years ago in reply to Subash Sundaresan1

Intellectual 560 points

Could you please reply to my above query?

0 Subash Sundaresan1 over 3 years ago in reply to Subash Sundaresan1

Intellectual 560 points

Hi QJ Wang,

We have one more query in regards to clearing the interrupt flag in MACINVECTOR - RXPEND. we getting interrupt but unable to clear the flag.

Thanks,

Subash

+1 QJ Wang over 3 years ago in reply to Subash Sundaresan1

TI__Guru**** 196496 points

Hi Subash,

In an EMAC Transmit ISR, the interrupt must be acknowledged to the EMAC hardware b writing MACEOIVECTOR register. However, the interrupt will be cleared only if the completion pointer (TXnCP, RXnCP) is written with the last processed TX buffer descriptor.

Reading the status registers will not clear the flags.

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TMS570LS3137-EP: EMAC Data receive DMA