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SourceVuESP-IDF Framework and ExamplesESP-IDFi2c_master_write()

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

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:

aligenie_demo sample

df_client sample

df_server sample

rpr_client sample

rpr_server sample

unprov_dev sample

References

from 0/6 examples

Code

Location

Referrer

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

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

ESP_GOTO_ON_ERROR(i2c_master_write(cmd_link, cmds + (sizeof(cmds) - cmds_size), cmds_size, true), err, TAG, "write LCD cmd failed");

esp_lcd_panel_io_i2c_v1.c:129

panel_io_i2c_rx_buffer()

ESP_GOTO_ON_ERROR(i2c_master_write(cmd_link, cmds + (sizeof(cmds) - cmds_size), cmds_size, true), err, TAG, "write LCD cmd failed");

esp_lcd_panel_io_i2c_v1.c:172

panel_io_i2c_tx_buffer()

ESP_GOTO_ON_ERROR(i2c_master_write(cmd_link, buffer, buffer_size, true), err, TAG, "write data failed");

esp_lcd_panel_io_i2c_v1.c:177

panel_io_i2c_tx_buffer()

err = i2c_master_write(handle, write_buffer, write_size, true);

i2c_master_write_to_device()

err = i2c_master_write(handle, write_buffer, write_size, true);

i2c_master_write_read_device()

Call Tree

from 0/6 examples

i2c_master_write() is called by 4 functions and calls 4 functions:

i2c_master_write_to_device()

i2c_master_write_read_device()

panel_io_i2c_rx_buffer()

panel_io_i2c_tx_buffer()

i2c_master_write()

esp_log_timestamp()

esp_log_write()

i2c_cmd_link_append()

i2c_master_write_byte()

Data Use

from 0/6 examples

i2c_master_write() reads 6 variables:

esp_log_level_t::ESP_LOG_ERROR

esp_log_level_t::ESP_LOG_WARN

esp_log_level_t::ESP_LOG_INFO

esp_log_level_t::ESP_LOG_DEBUG

esp_log_level_t::ESP_LOG_VERBOSE

i2c_master_write()

Class Tree

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Override Tree

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Implementations

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Instances

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Lifecycle

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