bl_iot_sdk/README.rst

BL602 SDK (Pine64 version)
==========================

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This repository contains the Pine64 fork of Bouffalo Lab's SDK for their BL602
Wi-Fi/BLE Combo RISC-V SoC. Documentation, including upstream documentation,
translations, mirrored technical documentation, and original reverse engineered
documentation is at `bl602-docs <https://github.com/pine64/bl602-docs>`_, which
is cloned as a submodule of this repository at ``docs``. Use `git submodule update --init` to initialize the submodule. 

This repository is the central focus of Pine64's
`Nutcracker Challenge <https://www.pine64.org/2020/10/28/nutcracker-challenge-blob-free-wifi-ble/>`_.

Documentation
------------
You can find a lot of documentation on `PINE64 Documentation Website <https://pine64.github.io/bl602-docs/>`_ and `PINE64 Documentation Repository <https://github.com/pine64/bl602-docs>`_, where you can find Datasheets, Reference Manuals and various other documentation materials.

Quick Start
-----------
In order to build sample apps, you need to set a few environment variables::

    export BL60X_SDK_PATH=/path/to/this/repo
    export CONFIG_CHIP_NAME=BL602

In order to build all sample apps simply call `make`, for example ::
    make

To only build the sample app of interest, go to the directory of the app,
then call `make`, for example::

    cd customer_app/bl602_boot2
    make

Call ::
=======

    make CONFIG_TOOLPREFIX=riscv64-linux-gnu-

for bypassing the bundled cross-compiler and using your distribution's own
cross-compiler.

There is a linker script (written in python) at `image_conf/flash_build.py`.
To run this, you need to specify the application and the target, for example::

    python3 flash_build.py bl602_boot2 bl602

Hardware
--------
BL602 is a 32-bit RISC-V based combo chipset supporting Wi-Fi and BLE (Bluetooth
Low Energy). The chip is made by `Nanjing-based Bouffalo Lab <https://www.bouffalolab.com/bl602>`_
for ultra-low-power applications. In terms of price range and feature set, the
chip is competing against `Espressif ESP8266 <https://www.espressif.com/en/products/socs/esp8266>`_.
The RISC-V core is based on `SiFive E24 <https://www.sifive.com/cores/e24>`_.

At the moment there are mainly three development boards:

  - `PineCone <https://www.pine64.org/2020/10/28/nutcracker-challenge-blob-free-wifi-ble/>`_: USB-C evaluation board by Pine64 (datasheet `here <https://www.cnx-software.com/pdf/schematics/Pine64%20BL602%20EVB%20Schematic%20ver%201.1.pdf>`_), RGB LED, CH340N USB-to-UART chip
  - `Doi.am DT-BL10 <https://www.cnx-software.com/2020/10/25/bl602-iot-sdk-and-5-dt-bl10-wifi-ble-risc-v-development-board/>`_: micro USB
  - `Official BL EVB <https://twitter.com/nnn112358/status/1321289916249235457>`_ (Sipeed early adopter program): mini USB, FTDI chip?

Comparison with ESP8266
-----------------------
+-------------------+-----------------------------+----------------------------------+
|                   | Bouffalo Lab BL602          | Espressif ESP8266                |
+===================+=============================+==================================+
| Architecture      | 32-bit RISC-V (SiFive E24)  | 32-bit Xtensa                    |
|                   |                             |                                  |
|                   | @192MHz (dynamic @1-192MHz) | @80MHz (and 160MHz)              |
|                   |                             |                                  |
|                   | L1 cache                    |                                  |
|                   |                             |                                  |
|                   | FPU                         |                                  |
+-------------------+-----------------------------+----------------------------------+
| Memory            | 276KB SRAM                  | 32 KiB instruction RAM           |
|                   |                             |                                  |
|                   | 128KB ROM                   | 32 KiB instruction cache RAM     |
|                   |                             |                                  |
|                   | 1 Kb eFuse                  | 80 KiB user-data RAM             |
|                   |                             |                                  |
|                   | optional embdedded flash    | 16 KiB ETS system-data RAM       |
|                   |                             |                                  |
|                   |                             |                                  |
|                   | XIP QSPI flash support      | No programmable ROM              |
|                   |                             |                                  |
|                   |                             | QSPI flash support               |
|                   |                             | (up to 16 MB)                    |
+-------------------+-----------------------------+----------------------------------+
| Wi-Fi             | 802.11 b/g/n @2.4GHz        | 802.11 b/g/n @2.4GHz             |
|                   |                             |                                  |
|                   | WPS/WEP/WPA/WPA2/WPA3       | WEP/WPA/WPA2                     |
+-------------------+-----------------------------+----------------------------------+
| Bluetooth         | LE 5.0                      | NONE                             |
+-------------------+-----------------------------+----------------------------------+
| GPIO              | x16                         | x16                              |
+-------------------+-----------------------------+----------------------------------+
| SDIO              | x1 2.0 slave                | x1 v2.0 slave                    |
+-------------------+-----------------------------+----------------------------------+
| SPI               | x1                          | x2                               |
+-------------------+-----------------------------+----------------------------------+
| UART              | x2                          | x1.5                             |
|                   |                             | (One Tx only)                    |
+-------------------+-----------------------------+----------------------------------+
| I2C               | x1                          | x1 (software implemented)        |
+-------------------+-----------------------------+----------------------------------+
| I2S               | NONE                        | x1 (with DMA)                    |
+-------------------+-----------------------------+----------------------------------+
| PWM channels      | x5                          | x4                               |
+-------------------+-----------------------------+----------------------------------+
| ADC               | 12-bit                      | 10-bit (SAR)                     |
+-------------------+-----------------------------+----------------------------------+
| DAC               | 10-bit                      | NONE                             |
+-------------------+-----------------------------+----------------------------------+
| Analog Comparator | x2                          | NONE                             |
+-------------------+-----------------------------+----------------------------------+
| DMA               | x4                          | with I2S                         |
+-------------------+-----------------------------+----------------------------------+
| Timer             | RTC (up to 1 year)          | x1 hardware                      |
|                   |                             |                                  |
|                   | x2 32-bit general-purpose   | x1 software                      |
|                   |                             |                                  |
|                   |                             | (no interrupt gen. on sw. timer) |
+-------------------+-----------------------------+----------------------------------+
| IR Remote Control | x1                          | x1                               |
+-------------------+-----------------------------+----------------------------------+
| Debug             | JTAG support                | ?                                |
+-------------------+-----------------------------+----------------------------------+