spi_slave_hd_append_trans() function

Load transactions (append mode)

Syntax

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Summary

Declaration

from spi_slave_hd.h:189

esp_err_t spi_slave_hd_append_trans(spi_host_device_t host_id, spi_slave_chan_t chan, spi_slave_hd_data_t *trans, TickType_t timeout);

Arguments

Argument

Description

host_id

Host to load transactions

chan

SPI_SLAVE_CHAN_TX or SPI_SLAVE_CHAN_RX

trans

Transaction descriptor

timeout

Timeout before the transaction is loaded

Return value

- ESP_OK: on success - ESP_ERR_INVALID_ARG: The input argument is invalid. Can be the following reason: - The buffer given is not DMA capable - The length of data is invalid (not larger than 0, or exceed the max transfer length) - The transaction direction is invalid - ESP_ERR_TIMEOUT: Master is still processing previous transaction. There is no available transaction for slave to load - ESP_ERR_INVALID_STATE: Function called in invalid state. This API should be called under append mode.

Notes

In this mode, user transaction descriptors will be appended to the DMA and the DMA will keep processing the data without stopping

Examples

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

References

from examples

spi_slave_hd_append_trans() function

Syntax

Arguments

Return value

Notes

Examples

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