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SourceVuESP-IDF Framework and ExamplesESP-IDFi2c_slave_transmit()

i2c_slave_transmit() function

Write bytes to internal ringbuffer of the I2C slave data. When the TX fifo empty, the ISR will fill the hardware FIFO with the internal ringbuffer's data.

Syntax

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Summary

Declaration

Definition

from i2c_slave.h:98

esp_err_t i2c_slave_transmit(i2c_slave_dev_handle_t i2c_slave, const uint8_t *data, int size, int xfer_timeout_ms);

Implemented in i2c_slave.c:329

Arguments

Argument

Description

i2c_slave

I2C slave device handle that created by `i2c_new_slave_device`.

data

Buffer to write to slave fifo, can pickup by master. Can be freed after this function returns. Equal or larger than `size`.

size

In bytes, of `data` buffer.

xfer_timeout_ms

Wait timeout, in ms. Note: -1 means wait forever.

Return value

- ESP_OK: I2C slave transmit success. - ESP_ERR_INVALID_ARG: I2C slave transmit parameter invalid. - ESP_ERR_TIMEOUT: Operation timeout(larger than xfer_timeout_ms) because the device is busy or hardware crash. - ESP_ERR_NOT_SUPPORTED: This function should be work in fifo mode, but I2C_SLAVE_NONFIFO mode is configured

Notes

If you connect this slave device to some master device, the data transaction direction is from slave device to master device.

Examples

References

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i2c_slave_transmit() function

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Arguments

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i2c_slave_transmit() function

Syntax

Arguments

Return value

Notes

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Examples

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