bt_speaker does not compile - error: implicit declaration of function 'esp_a2d_register_data_callback'

[N0rbert]

What I did:

1. installed ESP-IDF into ~/esp as recommended in the official documentation and then successfully compiled hello_world project;
2. cloned this repository with git clone https://github.com/LilyGO/TTGO-T9-RGB_LED-WM8978.git (latest commit ac508f0191031794072ed5a39dfc69080d6fbd03);
3. tried to compile bt_speaker with the following actions:

cd TTGO-T9-RGB_LED-WM8978/bt_speaker
make # used defaults anywhere

Got error message:

TTGO-T9-RGB_LED-WM8978/bt_speaker/components/bt_speaker/./bt_speaker.c:90:9: error: implicit declaration of function 'esp_a2d_register_data_callback' [-Werror=implicit-function-declaration] esp_a2d_register_data_callback(bt_app_a2d_data_cb); ^ cc1: some warnings being treated as errors /home/user/esp/esp-idf/make/component_wrapper.mk:273: recipe for target 'bt_speaker.o' failed make[1]: *** [bt_speaker.o] Error 1 /home/user/esp/esp-idf/make/project.mk:457: recipe for target 'component-bt_speaker-build' failed

Note: I'm using ESP-IDF on fully updated 64-bit Ubuntu 16.04 LTS.

Which version of toolchain should I use to get it compiled successfully?

However other project (https://github.com/HsaSheep/esp-wroom-32_a2dp_sink) compiles normally with this toolchain.

[cjdell]

Changing the function reference from: esp_a2d_register_data_callback to: esp_a2d_sink_register_data_callback seemed to fix it for me.

[xuhongv]

good jod