i2c_master_write() function

Queue a "write (multiple) bytes" command to the commands list. This function shall only be called in I2C master mode. Call `i2c_master_cmd_begin()` to send all queued commands

Syntax

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Summary

Declaration

Definition

from i2c.h:342

esp_err_t i2c_master_write(i2c_cmd_handle_t cmd_handle, const uint8_t *data, size_t data_len, bool ack_en);

Implemented in i2c.c:1296

Arguments

Argument

Description

cmd_handle

I2C commands list

data

Bytes to send. This buffer shall remain **valid** until the transaction is finished. If the PSRAM is enabled and `intr_flag` is set to `ESP_INTR_FLAG_IRAM`, `data` should be allocated from internal RAM.

data_len

Length, in bytes, of the data buffer

ack_en

Enable ACK signal

Return value

- ESP_OK Success - ESP_ERR_INVALID_ARG Parameter error - ESP_ERR_NO_MEM The static buffer used to create `cmd_handler` is too small - ESP_FAIL No more memory left on the heap

Examples

i2c_master_write() is referenced by 6 libraries and example projects:

References

from examples

i2c_master_write() function

Syntax

Arguments

Return value

Examples

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