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emac_esp_dma_receive_frame() function
Copy received Ethernet frame from EMAC DMA memory space to application.
Syntax
uint32_t emac_esp_dma_receive_frame(emac_esp_dma_handle_t emac_esp_dma,
uint8_t *buf,
uint32_t size);
Implemented in ![]()
esp_eth_mac_esp_dma.c:363
Return value
- number of copied bytes when success - number of bytes of received Ethernet frame when maximum allowed buffer @p size is less than actual size of received Ethernet frame and @p size is NOT set to @c EMAC_DMA_BUF_SIZE_AUTO - 0 when there is no waiting Ethernet frame or on frame error when @p size is NOT set to @c EMAC_DMA_BUF_SIZE_AUTO
Notes
When this function is called with @c EMAC_DMA_BUF_SIZE_AUTO size option (preferred), buffer needs to be successfully allocated by ::emac_esp_dma_alloc_recv_buf function at first. When this function is NOT called with @c EMAC_DMA_BUF_SIZE_AUTO size option and maximum allowed buffer @p size is less than actual size of received Ethernet frame, the frame will be truncated. FCS field is never copied
Related Functions
Found 11 other functions taking a ![]()
emac_esp_dma_t
argument:
Function
Description
Flush frame stored in Rx DMA
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.
Allocate buffer with size equal to actually received Ethernet frame size.
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