esp32-at-ble-stack

This is a library for using Mbed OS BLE stack with ESP32. Please update the ESP32 firmware to AT version: 1.1.3.0 or later to use the BLE function.
Please see the Mbed OS Example BLE GitHub Repo for all code examples, and the Mbed OS BLE API page for all code documentation and general help.

It works properly only in the peripheral role. The center role does not work properly with the ESP32 firmware problem.
The following samples have been verified to work.

• BLE_LED
• BLE_Button
• BLE_BatteryLevel
• BLE_HeartRate
• BLE_Thermometer

This library is used by combining mbed-os and esp32-driver. You need to add the following to mbed_app.json:

    "target.features_add"    : ["BLE"],
    "target.extra_labels_add": ["ESP32AT_BLE"]

Please refer to RZ_A2M_BLE_sample for details.

Getting Started

• Mbed OS examples for all Mbed OS and BLE examples.
• Mbed OS example BLE GitHub repo for all Mbed OS BLE examples.
• Mbed OS BLE introduction for an introduction to Mbed BLE.
• Mbed OS BLE API page for the Mbed BLE API documentation.

How to update ESP32 firmware

In the case of GR-LYCHEE or GR-PEACH

Please refer to the following.
https://github.com/d-kato/GR-Boards_ESP32_Serial_Bridge

In the case of RZ/A2M Evaluation Board Kit

Download the ESP32 firmware:
https://www.espressif.com/en/support/download/at

Espressif’s official Flash Download Tools:
http://espressif.com/en/support/download/other-tools?keys=&field_type_tid%5B%5D=13

Connection:

Turn on SW1-2 of Pmod ESP32.

Write the following firmware in the docs/serial_bridge to your board using custom boot loader:

• RZ_A2M_EVB_EPS32_Serial_Bridge_application.bin

The firmware settings are described in ESP32_AT_Vxxx/download.config.
In the case of ESP32_AT_V1.2, the settings are as follows.

• SPI SPEED : 40MHz
• SPI MODE : DIO
• FLASH SIZE : 32Mbit
• COM : Set your board COM.
• BAUD : 576000 (If a write error occurs, try again with the smaller value.)

Path	offset
ota_data_initial.bin	0x10000
bootloader/bootloader.bin	0x1000
at_customize.bin	0x20000
customized_partitions/ble_data.bin	0x21000
customized_partitions/server_cert.bin	0x24000
customized_partitions/server_key.bin	0x26000
customized_partitions/server_ca.bin	0x28000
customized_partitions/client_cert.bin	0x2a000
customized_partitions/client_key.bin	0x2c000
customized_partitions/client_ca.bin	0x2e000
customized_partitions/factory_param.bin	0x30000
phy_init_data.bin	0xf000
esp-at.bin	0x100000
partitions_at.bin	0x8000

Procedure:

1. Connect the USB-F connector to your PC using a USB cable.
   Attention! It is not a UART connector used for printf output. It is a connector used by custom boot loader.
2. Press BTN1 on Pmod ESP32.
3. Press the Erase button on the tool to erase the unwanted data on the flash. The green area labeled IDLE in the tool changes to FINISH when finished.
4. Press BTN1 on Pmod ESP32.
5. Press the START button on the tool to start writing. The green area labeled IDLE in the tool changes to FINISH when finished.