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MCH2022 Badge Hardware

Block diagram

The badge contains a huge amount of awesome chips, so many that a block diagram is necessary to explain how everything is interconnected.

Block diagram

The ESP32 is at the center of the operation. It has access to almost all the peripherals on the badge and using its WiFi connectivity it can load new firmware and applications from the internet.

The RP2040 microcontroller provides USB connectivity consisting of two serial ports (for the ESP32 and the FPGA), WebUSB for managing the badge using your browser and HID for acting like a keyboard, mouse or joystick. It also drives the SK6812-EC15 addressable LEDs, giving the badge a lot of bling and eyecandy. To top it off a lot of the I/O pins of the RP2040 have been broken out, both as the IO pins of the SAO connector and as testpads next to the prototyping areas on the back of the badge.

The ICE40UP5K FPGA is programmed over an SPI connection by the ESP32. Using this connection the FPGA can also communicate with the application running on the ESP32. Our goal is to enable people to learn about HDL programming so new bitstreams can easily be loaded into the FPGA by user applications, to provide any function you want ranging from a simple LED blinker to a RISC-V SoC. To accomodate more advanced designs the FPGA is connected to the LCD display via a parallel bus, enabling it to update the display at high refresh rates, as well as 8MB of PSRAM via a Quad-SPI bus. 8 of the I/O pins of the FPGA have been broken out as an industry standard PMOD header, allowing users to connect standard expansion modules or their own creations.

Resources

Datasheets and Resources

  • ESP32 datasheet the datasheet for the main processor
  • ESP32 technical reference technical reference for the main processor. This contains information about the features of the chip, so technically, it belongs in the firmware section, but … whatever.
  • WROVER datasheet datasheet of the module. The processor is packed together with peripherals necessary for operations in a module (WROVER) nuder a metallic can.
  • RP2040 documentation site and datasheet
  • Lattice ICE40UP5K - iCE40UltraPlus documentation site and datasheet
  • BME680 4 in 1 gas sensor. (temperature, humidity, air pressure and volatile organic compounds (VOC)
  • BNO055 accelerometer, gyroscope, magnetometer sensor
  • Display also have a look here
  • SK6812-EC15 addressable RGB - LEDs (aka Neopixel)
  • MS4344 Audio DAC

1 - MCH2022 badge pinouts

Connectors

SAO (Shitty AddOn)

Addon connector following the SHITTY ADD-ON V1.69BIS standard.

Pin Description Direction Connection
1 VCC Power output 3.3v supply voltage output
2 GND Power output Ground reference
3 SDA Data IO I2C bus data
4 SCL Data output I2C bus clock
5 GPIO1 Data IO User configurable IO, connected to RP2040 GPIO18
6 GPIO2 Data IO User configurable IO, connected to RP2040 GPIO19

PMOD (peripheral module interface)

PMOD

The PMOD connector is wired up to the iCE40 FPGA. Note that while the connector is physically located on the backside of the badge, it has been wired up such that the PMOD’s top side must be pointed in the same direction as the badge’s top.

PMOD pin ICE40 pin Note
1 47 IOB_2a (paired with PMOD pin 7 IOB_3b_G6)
2 48 IOB_4a (paired with PMOD pin 8 IOB_5b)
3 4 IOB_8a (paired with PMOD pin 9 IOB_9b)
4 2 IOB_6a
7 44 IOB_3b_G6 (paired with PMOD pin 1 IOB_2a)
8 45 IOB_5b (paired with PMOD pin 2 IOB_4a)
9 3 IOB_9b (paired with PMOD pin 3 IOB_8a)
10 46 IOB_0a

Chips

ESP32

ESP32 GPIO Direction Function Note
0 Both I2S master clock output / UART download select input Drives I2S DAC / driven by RP2040 through resistor
1 Output UART TX Connected to RP2040
2 Both SD card data 0 SD card slot
3 Input UART RX Connected to RP2040
4 Output I2S bit clock
5 Output LED data Connected to the SK6805 LEDs in the kite
12 Output I2S LR channel select
13 Output I2S data
14 Output SD clock SD card slot
15 Output SD command SD card slot
18 Output SPI clock Connected to LCD and FPGA
19 Output SD card and kite LED power control Set high to enable power to LEDs and SD card
21 Output I2C clock Connected to RP2040, BNO055, BME680, Qwiic connector and SAO addon connector
22 Both I2C data Connected to RP2040, BNO055, BME680, Qwiic connector and SAO addon connector
23 Output SPI MOSI Data from ESP32 to LCD / FPGA
25 Both LCD reset Set to output low to reset LCD, leave floating normally
26 Output LCD mode Low: LCD in SPI mode, high: LCD in parallel mode
27 Output SPI chip select for ICE40 Low: select ICE40, high: deselect ICE40
32 Both SPI chip select for LCD Low: select LCD, high: deselect LCD. Note: output in LCD SPI mode, input in LCD parallel mode
33 Both LCD DC (data or command) selection Note: output in LCD SPI mode, input in LCD parallel mode
34 Input Interrupt from RP2040
35 Input SPI MISO Connected to ICE40
36 (SENSOR_VP) Input Interrupt from position sensor (BNO055)
39 (SENSOR_VN) Input Interrupt from ICE40 FPGA

RP2040

RP2040 GPIO Direction Pull Function Description
0 Output UART0 TX ESP32 UART
1 Input UART0 RX ESP32 UART
2 Both I2C1 SDA I2C bus data (RP2040 is in slave mode)
3 Input I2C1 SCL I2C bus clock
4 Input Up GPIO Button: MENU
5 Input Up GPIO Button: HOME
6 Input Up GPIO Button: ACCEPT
7 Input Up GPIO Button: Joystick A
8 Input Up GPIO Button: Joystick B
9 Input Up GPIO Button: Joystick C
10 Input Up GPIO Button: Joystick D
11 Input Up GPIO Button: Joystick E
12 Both GPIO ESP32 bootloader mode¹
13 Output GPIO ESP32 enable
14 Both GPIO ESP32 interrupt¹
15 Output PWM LCD backlight brightness
16 Both GPIO Available next to prototyping area
17 Both GPIO Available next to prototyping area
18 Both GPIO SAO GPIO1
19 Both GPIO SAO GPIO2
20 Input GPIO FPGA done
21 Output GPIO FPGA reset
22 Input Up GPIO Button: START
23 Input GPIO LiPo charger state
24 Output UART1 TX FPGA UART
25 Input UART1 RX FPGA UART
26 Input Up GPIO Button: BACK
27 Output GPIO Infrared LED
28 Input ADC Voltage measurement: USB input
29 Input ADC Voltage measurement: Battery

¹: Set to input normally and force low to activate

ICE40 FPGA

ICE40 pin ICE40 GPIO Direction Description Notes
2 IOB_6a Both PMOD pin 4
3 IOB_8a Both PMOD pin 3
4 IOB_9b Both PMOD pin 9
6 IOB_13b Input UART RX
9 IOB_16a Output UART TX
10 IOB_18a Output Interrupt Active-low
11 IOB_20a Output LCD register select
12 IOB_22b Both RAM SPI D2
13 IOB_24a Both RAM SPI D1
14 IOB_32a_SPI_SO Output SPI MISO
15 IOB_34b_SPI_SCK Input SPI SCK
16 IOB_35b_SPI_SS Input SPI SS
17 IOB_33b_SPI_SI Input SPI MOSI
18 IOB_31b Output RAM SPI CS
19 IOB_29b Output RAM SPI SCK
20 IOB_25b_G3 Both RAM SPI D3
21 IOB_23b Both RAM SPI D0
23 IOT_37a Output LCD write
25 IOT_36b Input LCD frame sync
26 IOT_39a Output LCD data 0
27 IOT_38a Output LCD data 1
28 IOT_41a Output LCD CS
31 IOT_42b Output LCD data 2
32 IOT_43a Output LCD data 3
34 IOT_44b Output LCD data 4
35 IOT_46b_G0 Input 12MHz clock
36 IOT_48b Output LCD reset Active-low, drive open-drain
37 IOT_45a_G1 Output LCD data 5
38 IOT_50b Output LCD data 6
39 RGB0 Output LED
40 RGB1 Output LED
41 RGB2 Output LED
42 IOT_51a Output LCD data 7
43 IOT_49a Input LCD mode Should be driven by ESP and monitored by FPGA
44 IOB_3b_G6 Both PMOD pin 7
45 IOB_5b Both PMOD pin 8
46 IOB_0a Both PMOD pin 10
47 IOB_2a Both PMOD pin 1
48 IOB_4a Both PMOD pin 2

2 - MCH2022 Badge Hardware Hacking

The badge is made for hacking, and the hardware is no exception. There are several intended ways to extend the badge, next to unlimited unintented ones.

If you have access to a 3D printer, an easy and worthwile hardware mod is to print a knob for the joystick, such as this one or a case.

Shitty Add-on

The badge has a SAO header, which can provide power, I2C, and 2 GPIOs to small accessories that can be plugged in.

Qwiic

At the back of the badge there is a Qwiic connector hooked up to the ESP32 that is compatible with a large family of modules from Sparkfun, Adafruit and others.

PMOD

On the side of the badge there is a PMOD connector hooked up to the FPGA that is compatible with a large family of modules from Digilent and others.

May Contain Hardware Area

On the back of the badge there is a prototyping area with a grid of pads, as well as pads the expose I2C, power, and GPIOs.

Across the rest of the PCB are labeled pads that expose things like the LED serial data, audio signal, IR signal, various debug pads, and more.