[Internet of Things] Hongmeng HI3861 Controller Development Board

Development board design ideas:

1. As small as possible, a small size development board of 3cm*6cm
2. It is easy to program, using the Type-C interface, integrated ch340n serial port circuit, directly connected to the hi3861 main chip. Has sending and receiving indicator lights.
3. Easy to expand, provides 5V power supply, 3.3V power supply expansion; provides i2c chip, expansion 16 channels.

SOC introduction:

The Hi3861 chip integrates a high-performance 32-bit microprocessor and has rich peripheral interfaces. The chip has built-in SRAM (Static Random Access Memory) and Flash, and supports running programs on Flash.
Hi3861 module has 2MB FLASH and 352KB RAM. But when we write code, we must pay attention to the reasonable use of limited resources.
Hi3861 can be said that although it is small, it has all the internal organs. The peripheral interfaces of Hi3861 include (external main crystal oscillator is 40M or 24M):

• 2 SPI (Synchronous Peripheral Interface)
• 3 UARTs (Universal Asynchronous Receiver & Transmitter)
• 2 I2C (The Inter-Integrated Circuit)
• 6-channel PWM (Pulse Width Modulation)
• 15 GPIOs (General Purpose Input/Output)
• 7-channel ADC (Analog to Digital Converter)
• 1 I2S interface
• 1 high-speed SDIO2.0 (Secure Digital Input/Output) interface, with a maximum clock of 50MHz;

software support:

The firmware can use the Hongmeng IoT system and provides rich API calls. Convenient Wifi network distribution and OTA updates.

You can use Linux for development and programming, which is much more convenient, but serial port programming is slower. It is recommended to burn the ota firmware, and then update the firmware via wifi, which is more convenient and faster.

Physical map:

It's a bit compact, the ch340n chip and 3.3v chip haven't arrived yet, so soldering is difficult!