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SourceVuESP-IDF Framework and ExamplesESP-IDFesp_hf_client_send_dtmf()

esp_hf_client_send_dtmf() function

Transmit DTMF codes during an ongoing call(use AT+VTS commands) As a precondition to use this API, Service Level Connection shall exist with AG.

Syntax

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Summary

Declaration

from esp_hf_client_api.h:599

esp_err_t esp_hf_client_send_dtmf(char code);

Arguments

Argument

Description

code

dtmf code, single ascii character in the set 0-9, #, *, A-D

Return value

- ESP_OK: the DTMF codes are sent to lower layer - ESP_ERR_INVALID_STATE: if bluetooth stack is not yet enabled - ESP_FAIL: others

Examples

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

hfp_hf sample

References

from 0/1 examples

Code

Location

esp_err_t esp_hf_client_send_dtmf(char code)

esp_hf_client_api.c:389

esp_err_t esp_hf_client_send_dtmf(char code);

esp_hf_client_api.h:599

Call Tree

from 0/1 examples

esp_hf_client_send_dtmf() calls 2 functions:

esp_hf_client_send_dtmf()

btc_transfer_context()

esp_bluedroid_get_status()

Data Use

from 0/1 examples

esp_hf_client_send_dtmf() reads 6 variables and writes 4 variables:

btc_sig_t::BTC_SIG_API_CALL

btc_pid_t::BTC_PID_HF_CLIENT

esp_bluedroid_status_t::ESP_BLUEDROID_STATUS_ENABLED

bt_status_t::BT_STATUS_SUCCESS

btc_hf_client_act_t::BTC_HF_CLIENT_SEND_DTMF_EVT

btc_hf_client_args_t::send_dtmf

esp_hf_client_send_dtmf()

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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