ESP-IDF + 0/7 examples

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SourceVuESP-IDF Framework and ExamplesESP-IDFi2c_master_write_byte()

i2c_master_write_byte() function

Queue a "write byte" command to the commands list. A single byte will be sent on the I2C port. 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_byte(i2c_cmd_handle_t cmd_handle, uint8_t data, bool ack_en);

Implemented in i2c.c:1319

Arguments

Argument

Description

cmd_handle

I2C commands list

data

Byte to send on the port

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_byte() is referenced by 7 libraries and example projects:

aligenie_demo sample

df_client sample

df_server sample

rpr_client sample

rpr_server sample

unprov_dev sample

i2s_es7210_tdm sample

References

from 0/7 examples

Code

Location

Referrer

esp_err_t i2c_master_write_byte(i2c_cmd_handle_t cmd_handle, uint8_t data, bool ack_en)

esp_err_t i2c_master_write_byte(i2c_cmd_handle_t cmd_handle, uint8_t data, bool ack_en);

ESP_GOTO_ON_ERROR(i2c_master_write_byte(cmd_link, (i2c_panel_io->dev_addr << 1) | I2C_MASTER_WRITE, true), err, TAG, "write address failed"); // address phase

esp_lcd_panel_io_i2c_v1.c:120

panel_io_i2c_rx_buffer()

ESP_GOTO_ON_ERROR(i2c_master_write_byte(cmd_link, i2c_panel_io->control_phase_cmd, true),

esp_lcd_panel_io_i2c_v1.c:123

panel_io_i2c_rx_buffer()

ESP_GOTO_ON_ERROR(i2c_master_write_byte(cmd_link, (i2c_panel_io->dev_addr << 1) | I2C_MASTER_READ, true), err, TAG, "write address failed"); // address phase

esp_lcd_panel_io_i2c_v1.c:135

panel_io_i2c_rx_buffer()

ESP_GOTO_ON_ERROR(i2c_master_write_byte(cmd_link, (i2c_panel_io->dev_addr << 1) | I2C_MASTER_WRITE, true), err, TAG, "write address failed"); // address phase

esp_lcd_panel_io_i2c_v1.c:161

panel_io_i2c_tx_buffer()

ESP_GOTO_ON_ERROR(i2c_master_write_byte(cmd_link, is_param ? i2c_panel_io->control_phase_cmd : i2c_panel_io->control_phase_data, true),

esp_lcd_panel_io_i2c_v1.c:163

panel_io_i2c_tx_buffer()

err = i2c_master_write_byte(handle, device_address << 1 | I2C_MASTER_WRITE, true);

i2c_master_write_to_device()

err = i2c_master_write_byte(handle, device_address << 1 | I2C_MASTER_READ, true);

i2c_master_read_from_device()

err = i2c_master_write_byte(handle, device_address << 1 | I2C_MASTER_WRITE, true);

i2c_master_write_read_device()

err = i2c_master_write_byte(handle, device_address << 1 | I2C_MASTER_READ, true);

i2c_master_write_read_device()

return i2c_master_write_byte(cmd_handle, *data, ack_en);

i2c_master_write()

Call Tree

from 0/7 examples

i2c_master_write_byte() is called by 6 functions and calls 3 functions:

i2c_master_write_to_device()

i2c_master_read_from_device()

i2c_master_write_read_device()

i2c_master_write()

panel_io_i2c_rx_buffer()

panel_io_i2c_tx_buffer()

i2c_master_write_byte()

esp_log_timestamp()

esp_log_write()

i2c_cmd_link_append()

Data Use

from 0/7 examples

i2c_master_write_byte() 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_byte()

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Lifecycle

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