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emac_esp_dma_alloc_recv_buf() function
Allocate buffer with size equal to actually received Ethernet frame size.
Syntax
Implemented in ![]()
esp_eth_mac_esp_dma.c:333
Return value
Pointer to allocated buffer NULL when allocation fails (returned @p size is non-zero) NULL when there is no waiting Ethernet frame (returned @p size is zero)
Notes
If maximum allowed size of buffer to be allocated is less than actual size of received Ethernet frame, the buffer is allocated with that limit and the frame will be truncated by emac_hal_receive_frame.
Related Functions
Found 11 other functions taking a ![]()
emac_esp_dma_t
argument:
Function
Description
Flush frame stored in Rx DMA
Copy received Ethernet frame from EMAC DMA memory space to application.
Get number of frames remaining in Rx DMA
Deletes the ESP EMAC DMA instance
Reset DMA
Transmit data from buffer over EMAC
Transmit data from multiple buffers over EMAC in single Ethernet frame. Data will be joint into single frame in order in which the buffers are stored in input array. @pre @p lengths array must have the same size as @p buffs array and their elements need to be stored in the same order, i.e. lengths[1] is a length associated with data buffer referenced at buffs[1] position.
Set the Transmit Descriptor Word 0 (TDES0) control bits
Clear the Transmit Descriptor Word 0 (TDES0) control bits
Creates a new instance of the ESP EMAC DMA