micropython/espflash/README: Add build instructions.

This is for both the NINAW10 firmware and the esp_hosted firmware.

Signed-off-by: robert-hh <robert@hammelrath.com>

Author: robert-hh

micropython/espflash/README.md

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+# Instructions to build the NINAW10 and esp_hosted firmware
+
+# NINAW10 firmware
+
+The NINAW10 firmware only works with classic ESP32 devices. No support
+for newer models like ESP32C3.
+
+## Get the NINAW10 Arduino source code
+
+The link is https://github.com/arduino/nina-fw.git. Follow the
+instructions in the README.md document of the NINA firmware to
+download the NINA firmware and the esp-idf.
+
+## Get the ESP32 development environment.
+
+The NINA firmware needs esp-idf v3.3.1 up to v3.3.4. After installing
+the esp-idf version, run:
+
+    ./install.sh  
+    git submodule sync  
+    git submodule update --init  
+    . export.sh
+
+in the esp-idf directory.
+
+## Check the SPI and UART pins.
+
+Change SPI pins at the end of this file:  
+
+nina-fw-1.5.0-Arduino/arduino/libraries/SPIS/src/SPIS.cpp  
+
+Suitable settings:
+
+    // for NINA W102:
+    SPISClass SPIS(VSPI_HOST, 1, 12, 23, 18, 5, 33); // SPI-device, DMA-channel, MOSI, MISO, SCK, CS, ACK
+
+    // for Airlift:
+    SPISClass SPIS(VSPI_HOST, 1, 14, 23, 18, 5, 33); // SPI-device, DMA-channel, MOSI, MISO, SCK, CS, ACK
+
+
+Change UART pins at about line 123 in this file: 
+
+nina-fw-1.5.0-Arduino/main/sketch.ino.cpp
+
+Suitable settings:
+
+    // Airlift
+    uart_set_pin(UART_NUM_1, 1, 3, 33, 14); // TX, RX, RTS, CTS
+
+    // W102
+    uart_set_pin(UART_NUM_1, 1, 3, 33, 12); // TX, RX, RTS, CTS
+
+The respective pin assignments can be found below in the pin table.
+The only difference between the Arduino Airlift and NINAW102 module
+is for the RTS/MOSI pin. If you use a custom ESP32 device and want to
+use different pins, you can change the pin numbers as needed.
+
+## Build the firmware
+
+Call `make RELEASE=1 NANO_RP2040_CONNECT=1` to build the firmware.
+Run combine.py with `python combine.py` to get a combined firmware
+file, which can be loaded to the target module using e.g. espflash.py.
+The file name will be `NINA_W102.bin`.
+
+Sample script to create the combined firmware:
+
+    #!/usr/bin/env python
+
+    import sys;
+
+    booloaderData = open("build/bootloader/bootloader.bin", "rb").read()
+    partitionData = open("build/partitions.bin", "rb").read()
+    phyData = open("data/phy.bin", "rb").read()
+    certsData = open("data/roots.pem", "rb").read()
+    appData = open("build/nina-fw.bin", "rb").read()
+
+    # calculate the output binary size, app offset 
+    outputSize = 0x30000 + len(appData)
+    if (outputSize % 1024):
+        outputSize += 1024 - (outputSize % 1024)
+
+    # allocate and init to 0xff
+    outputData = bytearray(b'\xff') * outputSize
+
+    # copy data: bootloader, partitions, app
+    for i in range(0, len(booloaderData)):
+        outputData[0x1000 + i] = booloaderData[i]
+
+    for i in range(0, len(partitionData)):
+        outputData[0x8000 + i] = partitionData[i]
+
+    for i in range(0, len(phyData)):
+            outputData[0xf000 + i] = phyData[i]
+
+    for i in range(0, len(certsData)):
+            outputData[0x10000 + i] = certsData[i]
+
+    # zero terminate the pem file
+    outputData[0x10000 + len(certsData)] = 0
+
+    for i in range(0, len(appData)):
+        outputData[0x30000 + i] = appData[i]
+
+
+    outputFilename = "NINA_W102.bin"
+    if (len(sys.argv) > 1):
+        outputFilename = sys.argv[1]
+
+    # write out
+    with open(outputFilename,"w+b") as f:
+        f.seek(0)
+        f.write(outputData)
+
+The combined firmware file will be `NINA_W102.bin`. This
+file can be loaded to the target module using e.g. espflash.py.
+
+# Esp-hosted firmware
+
+The esp-hosted firmware should work with all ESP32 modules. Tested with
+a ESP32 classic and a ESP32C3.
+
+## Get the esp-hosted source code
+
+The source code repository is at:  
+
+https://github.com/espressif/esp-hosted.git
+
+The code for the esp-hosted network adapter is at:  
+
+esp_hosted_fg/esp/esp_driver
+
+The commit used for these instructions is `244b864`. Newer version are
+not tested.
+
+## Get the ESP32 development environment.
+
+Follow the instructions in the README.md of micropython/ports/esp32.
+Check out v5.5.1. Run in the esp-idf directory:
+
+    ./install.sh  
+    git submodule sync  
+    git submodule update --init  
+    . export.sh  
+
+## Check the UART pins.
+
+The UART pins for bluetooth are defined in the file:  
+
+esp_hosted_fg/esp/esp_driver/network_adapter/main/slave_bt.h
+
+The UART settings used for the airlift module with ESP32 are:
+
+    #define BT_TX_PIN           1
+    #define BT_RX_PIN           3
+    #define BT_RTS_PIN         14
+    #define BT_CTS_PIN         33
+
+The UART settings used for the NINAW102 module with ESP32 are:
+
+    #define BT_TX_PIN           1
+    #define BT_RX_PIN           3
+    #define BT_RTS_PIN         12
+    #define BT_CTS_PIN         33
+
+The respective pin assignments can be found in the table below.
+The only difference between the Arduino Airlift and NINAW102 module
+is for the RTS/MOSI pin. If you use a custom ESP32 device and want to
+use different pins, you can change the pin numbers as needed.
+
+## Set the configuration in sdkconfig
+
+The SPI and Bluetooth configuration is stored in teh file sdkconfig. Call
+`idf.py menuconfig` in a terminal window to create or modify the
+sdkconfig configuration file.
+
+Change/verify the settings as follows:
+
+### SPI configuration
+
+- At `Example Configuration → Transport layer` select `SPI`.
+- At `Example Configuration → SPI Full-duplex Configuration → SPI controller to use` select VSPI.
+- At `Example Configuration → SPI Full-duplex Configuration → Hosted SPI GPIOs`set the GPIO pins to MOSI=14 (Airlift) or 12 (NINAW102), MISO=23, CLK=18, CS=5, handshake=33, data ready interupt=0, Reset=-1.  
+- Clear `Example Configuration → SPI Full-duplex Configuration → Deassert Handshake when SPI CS is deasserted`
+- Set `Example Configuration → SPI Full-duplex Configuration → SPI checksum ENABLE/DISABLE`.
+- Set `Example Configuration → Enable Mempool`
+- Set `Example Configuration → Start CLI at slave`
+- Set `Example Configuration → Wi-Fi control` to `Host manages Wi-Fi`
+
+
+### Bluetooth configuration.
+
+- Set `Component config → Bluetooth → Bluetooth → Host` to Disabled.
+- Set `Component config → Bluetooth → Bluetooth → Controller` to Enabled
+- Set `Component config → Bluetooth → Controller Options → Bluetooth controller mode (BR/EDR/BLE/DUALMODE)` to `BLE Only`.
+- Set `Component config → Bluetooth → Controller Options → HCI mode` to `UART(H4)`.
+- In  `Component config → Bluetooth → Controller Options → HCI UART(H4)` select UART 1, 460800 Baud and **disable flow control**.
+
+### PHY config
+
+- At `Component config → PHY` set `Max WiFi TX power` to 20 (default).
+- AT `Component config → PHY` enable `Reduce PHY TX power when brownout reset`
+
+After that, save the configuration by pressing the letter 'S'. That
+creates the file skdconfig or rewrites it after changes. 
+
+## Build the firmware
+
+Build the firmware using:
+
+idf.py build
+
+Create the combined firmware with the command:
+
+python -m esptool --chip esp32  merge_bin --flash_mode dio --flash_size keep --flash_freq 40m -o esp_hosted.bin 0x1000 build/bootloader/bootloader.bin 0x8000 build/partition_table/partition-table.bin 0xd000 build/ota_data_initial.bin 0x10000 build/network_adapter.bin
+
+The combined firmware file will be `esp_hosted.bin`. This
+file can be installed in the target module using e.g. espflash.py.
+
+
+# NINAW102 and esp-hosted pins assignments
+
+Mapping between firmware signal names and ESP32 pins for the NINA
+firmware and esp_hosted firmware
+
+    ========  ========== ========  =======  =======
+    NINAW102  esp_hosted NINAW102  Airlift  Airlift
+    Name      Name         pin     Name       pin
+    ========  ========== ========  =======  =======
+    MOSI      MOSI         12      MOSI       14
+    MISO      MISO         23      MISO       23
+    SCK       SCK          18      SCK        18
+    GPIO1/CS  CS            5      CS          5
+    ACK       HANDSHAKE    33      Busy       33
+    RESET     RESET        EN      Reset      EN
+    GPIO0     DATAREADY     0      GP0         0
+    TX        TX            1      TX          1
+    RX        TX            3      RX          3
+    RTS       MOSI/RTS     12      -          14
+    CTS       CTS          33      -          33
+    ========  ========== ========  =======  =======
+