This document summarizes an mbed WiFi target board called the UNO 91H that uses the RDA5981x WiFi chip and RDA5856QE32 Bluetooth chip. The UNO 91H board features the RDA5981x chip which integrates WiFi, Bluetooth, an ARM Cortex M4 processor, and various peripherals. It also contains the RDA5856QE32 Bluetooth chip. An example application combines these chips with mbed OS 5 and a voice assistant cloud service to enable a WiFi audio AI device.

1. RDA
June 2017
mbed WiFi Target: UNO 91H
Zhongyao Song
Senior Engineer

2. 1
Introduction

3. Introduction
2
n Design
n Innovation
n Products
n Marketing
+ à

4. Introduction
3
Technologies:
n RF, PA, PMU
n 2G/3G/4G Modem
n Wi-Fi, BLE
n Audio, ISP
n GPS
n Security
LAN
（Connectivity）
Signal
Audio/Video
WAN
（M2M）
GPRS/WCDMA
NB-IoT/LTE

5. 4
UNO 91H Board

6. UNO 91H Board
5
Details:
n DC 5V/USB
n 3.3V IO
n Wi-Fi/Bluetooth
n Codec/MIC/HP
n SD Card
n Key Pad
n DAP

7. UNO 91H Board
6

8. RDA5981x
7
Wi-Fi Features:
n CMOS single chip fully-integrated
radio/PHY/MAC
n Internal PA, LNA
n 2.4GHz IEEE 802.11b/g/n
n 20/40MHz bandwidth
n Support WEP/WPA/WPA2
n Support WPS/WMM/A-MPDU
n Dynamic TX power saving

9. RDA5981x
8
MCU Features:
n ARM cotex-M4F, @160MHz
n Up to 288K-Byte internal SRAM for user
n Up to 32M-bit internal Flash
n 160K-Byte SRAM for Wi-Fi stack, Flash cache
n UART/USB/SDMMC/SPI/I2C/I2S/ADC/PWM
n Watchdog and low power timer
n Support Timer/GPIO wakeup
n Hardware crypto accelerator AES RSA
n CRC accelerator and TRNG

10. RDA5981x
9
Advantages:
n Small size: compact 5x5mm2 QFN-40
n Highly-integrated: internal PMU/LDO/PA/LNA
n Multi-choice: RDA5981A/B/C
n Strong performance
n Large memory
n Rich peripherals
n Hardware accelerators
n Security

11. RDA5856QE32
10
Features:
n Bluetooth v4.2, support BR/EDR and BLE
n Integrated broadcast FM tuner
n VoC DSP core @104MHz
n 16 bits voice ADC
n 16 bits stereo DAC
n Support mp3/sbc/wma/aac/m4a/wav/ts/amr
n AT commands

12. 11
Application

13. Application
12
Structure:
n Cloud service
n mbed OS 5
n MCU Wi-Fi, BT, codec

14. mbed OS 5
13
n Securityn Connectivity
n Cloud n Client

15. mbed OS 5
14
Code repositories:
n Support git, hg
n Open Source (Apache-2.0)
n Code structure: RTOS/cmsis/hal/target/feature
Development tools:
n Compiler: armcc, arm-gcc, iccarm
n IDE: Online IDE, Keil, IAR EW, GNU ARM Eclipse
n Python tool: mbed-cli, greentea, htrun
n Configure file: json
n DAP: SWD/VFS/serial

16. Example
15
Wi-Fi Audio AI:
n DuerOS
cloud server, client API with TLS
n mbed OS 5:
TCP/IP socket, mbed-tls
n RDA5981/5856:
Wi-Fi, BT, codec, MIC, HP, storage, key pad

17. Example
16
Video:
RDA5981/5856 + mbed + DuerOS

18. 17
Thanks
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