spicommon_dma_desc_alloc() function

Alloc DMA descriptors for SPI

Syntax

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Summary

Declaration

Definition

from spi_common_internal.h:101

esp_err_t spicommon_dma_desc_alloc(spi_dma_ctx_t *dma_ctx, int cfg_max_sz, int *actual_max_sz);

Implemented in spi_common.c:285

Arguments

Argument

Description

dma_ctx

DMA context returned by `spicommon_dma_chan_alloc`

cfg_max_sz

Expected maximum transfer size, in bytes.

actual_max_sz

Actual max transfer size one transaction can be, in bytes.

Return value

- ESP_OK: On success - ESP_ERR_NO_MEM: No enough memory

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spicommon_dma_desc_alloc() function

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spicommon_dma_desc_alloc() function

Syntax

Arguments

Return value

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