gdma_start() function

Set DMA descriptor address and start engine

Syntax

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Summary

Declaration

from gdma.h:311

esp_err_t gdma_start(gdma_channel_handle_t dma_chan, intptr_t desc_base_addr);

Arguments

Argument

Description

dma_chan

GDMA channel handle, allocated by `gdma_new_channel`

desc_base_addr

Base address of descriptors (usually the descriptors are chained into a link or ring)

Return value

- ESP_OK: Start DMA engine successfully - ESP_ERR_INVALID_ARG: Start DMA engine failed because of invalid argument - ESP_ERR_INVALID_STATE: Start DMA engine failed because of invalid state, e.g. the channel is controlled by ETM, so can't start it manually - ESP_FAIL: Start DMA engine failed because of other error

Notes

This function is allowed to run within ISR context This function is also allowed to run when Cache is disabled, if `CONFIG_GDMA_CTRL_FUNC_IN_IRAM` is enabled

Examples

gdma_start() is referenced by 1 libraries and example projects:

References

from examples

gdma_start() function

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Arguments

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gdma_start() function

Syntax

Arguments

Return value

Notes

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Examples

References

Call Tree

Data Use

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