Wio-Rp2040---Circuitpython-port-notes

Taking some notes in order to port Circuitpython to Wio RP2040

Trying to figure out which interface is connected to ESP8285 - appears to be SPI1

On ESP8285 Datasheet

ESP8285 features 17 GPIOs, all of which can be assigned to support various functions of LED lights and buttons. Definitions of some GPIOs that are assigned with certain functions in demo application design are shown as below.

Pin Name Pin Num IO Function Name

MTCK 12 IO13 Button (Reset)

GPIO0 15 IO0 Wi-Fi Light

MTDI 10 IO12 Link Light

Altogether three interfaces have been defined, one is for the button (INPUT), while the other two are for LED light (OUTPUTS). Generally, MTCK is used to control the reset button, GPIO0 is used as a signal to indicate the Wi-Fi working state, MTDI is used as a signal light to indicate communication status between the device and the server.

Other Special Pins on ESP8285

EXT_RSTB INPUT External reset signal (ACTIVE LOW) XPD_DCDC I/O Deep-sleep wakeup (need to be connected to EXT_RSTB); GPIO16. CHIP_PU I Chip Enable High: On, chip works properly Low: Off, small current consumed

User in forum informs that Micropython port for this board is same as this version: https://github.com/IsQianGe/rp2040-spi

So, i want to check if there is any indication of connections in code...

// Probably ESP8285 is connected to SPI1...

#define DEFAULT_SPI1_SCK (10) // SPI1 SCK

#define DEFAULT_SPI1_MOSI (11) // SPI1 TX MOSI

#define DEFAULT_SPI1_MISO (8) // SPI1 RX MISO

#define SPI_CS 9 // SPI1 CSn - Active LOW

#define SPI_HANDSHARK 21 // Handshake? ESP32_Ready?

RP2040 Gpio0 is reset for the main board called NINA

I´ve found a repo with the Arduino Library to use Wifi with this board: https://github.com/0hotpotman0/Seeed_Wio_RP2040_WIFI

In Arduino Hardware and Libraries for this board i've found this:

#define PIN_SPI1_SCK (10u) // Same as Micropython

#define PIN_SPI1_MOSI (11u) // Same as Micropython ] #define PIN_SPI1_MISO (8u) // Same as Micropython

#define PIN_SPI1_SS (9u) // Same as Micropython

#define SPIWIFI_ACK (21u) // Handshake or Acknowledge

#define NINA_GPIO0 (21u)

#define SPIWIFI_SS (24u) // Appears not to be used? Why?

#define SPIWIFI_RESET (22u) // Is connected to 8285 EXT_RSTB ? There's no indication of that.

There is another pin that is used to power ON ESP = (25u)

SLAVEPOWER = 25; Active LOW

This capabilite is not mentioned in any other solution.

Probably, in order to get Wifi working, you need to put this pin LOW in your code.

From Adafruit_CircuitPython_ESP32SPI library, I need this three pins...

esp32_cs = DigitalInOut(board.ESP_CS) // >> Probably SPI1_SS - GP9 ou GP24

esp32_ready = DigitalInOut(board.ESP_BUSY) // >> SPIWIFI_ACK - GP21

esp32_reset = DigitalInOut(board.ESP_RESET) // >> SPIWIFI_RESET - GP22

Sequence of attribution and initialization on Micropython Port code:

//esp8285 power on mp_hal_pin_output(21); mp_hal_pin_output(22); mp_hal_pin_output(24); mp_hal_pin_output(25); mp_hal_pin_output(SPI_CS); gpio_put(21,1); gpio_put(24,1); gpio_put(22,1); gpio_put(SPI_CS,0); gpio_put(25,0); mp_hal_pin_input(SPI_HANDSHARK); gpio_put(SPI_CS,1);