ESP32-VGA

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Tindie-mediums.png

P968-cropped-720pxV.jpg

Contents

Features

  • ESP32 Module
  • 6-bit VGA color
    • 2:2:2 R:G:B
  • 2 x PS-2 DIN connectors
    • 5V mouse/keyboard
    • 3.3V to 5V level shifters
      • Better than 5V keyboard with series resistors
    • 10K pull-ups on both sides
  • 2 x FTDI connectors
  • 5V DC Jack
  • 3.3V regulator (optional)
  • GVS pins for extra ESP32 pins
  • 95x95mm form factor
  • 6-32 mounting holes

ESP-32 Module

ESP32 MODULE-720PX.jpg

ESP-32 Module Pinout

ESP32-Pinout.jpg

"Chip" on the module

Esp32-pinout-chip-ESP-WROOM-32.png

ESP32 Pin Usage - Rev 1

ESP-32 VGA Pinout.PNG

ESP32 Pin Usage - Revs 2, 3

ESP-32 VGA Pinout Rev2.PNG

Module Features

  • Architecture: Xtensa Dual-Core 32-bit LX6
  • CPU frequency: up to 240MHz
  • Total RAM available: 528KB (part of it reserved for system)
  • BootROM: 448KB
  • Internal FlashROM: none
  • External FlashROM: code and data, via SPI Flash; usual size 4MB
  • GPIO: 34 (GPIOs are multiplexed with other functions, including external FlashROM, UART, etc.)
  • UART: 3 RX/TX UART (no hardware handshaking), one TX-only UART
  • SPI: 4 SPI interfaces (one used for FlashROM)
  • I2C: 2 I2C (bitbang implementation available on any pins)
  • I2S: 2
  • ADC: 12-bit SAR ADC up to 18 channels
  • DAC: 2 8-bit DACs
  • RMT: 8 channels allowing accurate pulse transmit/receive
  • Programming: using BootROM bootloader from UART - due to external FlashROM and always-available BootROM bootloader, the ESP32 is not brickable

Video DAC LTSpice Simulation

Summing Resistor DAC

  • 5% resistors are "good enough"
  • 1V into 75 Ohm VGA load
  • 3.3V drive
  • ESP32 has 40 mA drive
    • Uses 10 mA (max)
    • R4 = 1.2 mA to -10 mA
    • R3 = 1.1 mA to -5.3 mA
  • Output in 4 steps
    • 0V
    • 0.3V
    • 0.65V
    • 0.96V

VGA Sim 2R.PNG

Headers (Rev 1 board)

H1 - 3.3V SRC select

H1 3p3V Select.png

  • 1-2 = Get 3.3V from ESP32 on-board regulator
  • 2-3 = Get 3.3V from on-board regulator (Default)

H2 - 5V SRC Select Jumper (Rev 1 Board)

  • 5V power options for the 5V to 3.3V regulator

H2 5V Select.png

  • 2x4 header
  • Care must be taken to install the correct jumpers
  • USB jumper sends out 5V when a USB cable is connected to the ESP32 module

Power from DC Jack

  • Do not connect USB cable when the DC jack is used
  • 1-2 = VUSB - Install - Power to ESP32
  • 3-4 = DCIN - Install - Power comes from DC jack
  • 5-6 = FTDI5V_1 - Do not install
  • 7-8 = FTDI5V_2 - Do not install

Power from USB on ESP32 module

  • 1-2 = VUSB - Install - 5V comes from USB on ESP32 module
  • 3-4 = DCIN - Do not install
  • 5-6 = FTDI5V_1 - Do not install
  • 7-8 = FTDI5V_2 - Do not install

Power from FTDI #1 (Rev 1)

  • Do not use this position with "most" FTDI cards since they will drive 5V on the Rx/Tx pins when the FTDI jumper is set to 5V

Power from FTDI #2

  • Do not use this position with "most" FTDI cards since they will drive 5V on the Rx/Tx pins when the FTDI jumper is set to 5V

Connectors (Rev 1 board)

P2/P4 = GVS - Rev 1

  • Ground/Voltage/Signal lines
  1. GPIO13
  2. GPIO14
  3. GPIO16
  4. GPIO17
  5. GPIO35
  6. GPIO34
  7. VN
  8. VP

P3 - VGA - Rev 1

  • ESP32 pins
  • This table is incorrect - it has the Lower/Higher bits swapped
  HSync => GPIO23
  VSync => GPIO15
  R0    => GPIO22
  R1    => GPIO21
  G0    => GPIO19
  G1    => GPIO18
  B0    => GPIO5
  B1    => GPIO4

J2 - FTDI #1 - Rev 1

  1. GND
  2. RTS (Not used)
  3. 5V (Power in if H2 is configured)
  4. RX (from card to External FTDI)
  5. TX (from External FTDI to card)
  6. CTS (Not used)

Connect to FTDI card - Rev 1

  • Set FTDI jumper to 3.3V (unlike picture below)
  • Cross-over pins 4 and 5 when connecting to FTDI card (Rev 1 only)

FTDI rot.jpg

J6 - FTDI #2 - Rev 1

  • Rev 1 board won't program or boot with FDTI #2 card attached
  • This interface is in common with the USB-to-Serial interface on the ESP32 module
  1. GND
  2. RTS (Not used)
  3. 5V (Power in if H2 is configured)
  4. TX2 (from card to External FTDI)
  5. RX2 (from External FTDI to card)
  6. CTS (Not used)
  • Requires a cross-over of the Transmit and Receive pins if directly connecting to an FTDI part
  • Earlier versions of the FabGL schematics used pin 12 for RX
  • Most recent (2020-02) ANSI terminal uses pin 34
  • Board won't boot with an FTDI interface attached and USB cable attached
    • This is an issue for the ANSI Terminal sketch
  • Original pins were (Rev 1 matches original)
  RX2    => 12
  TX2    => 2

Here's why using pin 12 is a bad idea: 

GPIO12 (MTDI) is used as a bootstrapping pin to select output voltage of an internal regulator which powers the flash chip (VDD_SDIO). This pin has an internal pulldown so if left unconnected it will read low at reset (selecting default 3.3V operation).

UART2 Rework

  • The easiest way to do this is to wire the FTDI to GPIO34 pin instead of pin J6-5
    • Not pretty, but it does work fine
  • This is what is needed to permanently rework the board
  • Rework is only needed to run "stock" FabGL code that uses the UART2 port on the ESP32 (like the ansi terminal)
  • Cut trace/adding jumper to rev 1 board
    • Route to GPIO34
  • Cut as follows (cut in white)

GPIO12 Cut.PNG

  • Add wire as follows (add wire in white)

GPIO34 Add.PNG

  • [2020-01-20] Tested rework on card and it worked

Connect to FTDI card - Rev 1

  • Set FTDI jumper to 3.3V
  • Cross-over pins 4 and 5 when connecting to FTDI card (Rev 1 only)

FTDI rot.jpg

J3 - PS/2 Keyboard - Rev 1

  • Purple DIN 6 connector
  • ESP32 pins
  DAT   => 32
  CLK   => 33

J4 - PS/2 Mouse - Rev 1

  • DIN 6 connector
  • ESP32 pins
  DAT   => 27
  CLK   => 26

J5 - Audio Out - RCA Jack - Rev 1

  • ESP32 pins
  AUD   => 25

J15 - 5mm Terminal Block - Rev 1

  • 5V
  • Gnd

Headers (Revs 2,3 boards)

  • The Rev 2 board changes around headers and connectors

H1 - 5V - Rev 2

  • The ESP32-VGA can be powered from either the DC Jack or ESP32 USB power
  • Warning: Do not power from 5V Power jack and connect USB cable to the ESP32 module at the same time
    • The ESP32 module has blocking diode to protect the module
      • If the 5V DC jack has a power supply attached with lower voltage it could result in the supplied being shorted between the USB 5V and the DC power jack
      • This is not an issue if the DC power jack is disconnected
  • This could be used for an external power switch

H2/H3 - GVS - Rev 2

  • 3x4 header
  • Ground/Voltage/Signal lines
  1. GPIO35
  2. GPIO12
  3. VN/I39
  4. VP/I36

Connectors (Revs 2, 3 boards)

P1 - PS/2 Mouse - Revs 2, 3

  • DIN 6 connector
  • ESP32 pins
  MSEDAT   => GPIO27
  MSECLK   => GPIO26

P2 - PS/2 Keyboard - Revs 2, 3

  • Purple DIN 6 connector
  • ESP32 pins
  KBDAT   => GPIO32
  KBCLK   => GPIO33

P3 - VGA - Revs 2, 3

  • ESP32 pins
  HSync => GPIO23
  VSync => GPIO15
  R0    => GPIO22
  R1    => GPIO21
  G0    => GPIO19
  G1    => GPIO18
  B0    => GPIO5
  B1    => GPIO4

P4 - Audio Out - RCA Jack - Revs 2, 3

  • ESP32 pins
  AUD   => GPIO25

J1 - 5V Power - Revs 2, 3

  • Center +5V

J2 - FTDI #1 - Revs 2, 3

  • This interface is in common with the USB-to-Serial interface on the ESP32 module
  • Pinout
  1. GND
  2. RTS (Not used)
  3. 5V (Not used in Rev 2), Connects to J5 on Rev 3
  4. RX (from card to External FTDI)
  5. TX (from External FTDI to card)
  6. CTS (Not used)
  RX    => GPIO3
  TX    => GPIO1

Connect to FTDI card - Rev 2

  • Set FTDI jumper to 3.3V

FTDI rot.jpg

J3 - FTDI #2 - Rev 2

  • Most recent (2020-02) ANSI terminal uses pin 34 for Rx
  • Pinout
  1. GND
  2. RTS (Not used)
  3. 5V (Power in if H2 is configured)
  4. RX (from External FTDI to ESP32 card)
  5. TX (from ESP32 card to External FTDI)
  6. CTS (Not used)
  RX2    => GPIO34
  TX2    => GPIO2

Connect to FTDI card - Rev 2

  • Set FTDI jumper to 3.3V (image below shows jumper set to 5V which is wrong)

FTDI rot.jpg

J3 - FTDI #2 - Rev 3

  • Most recent (as of 2020-02) ANSI terminal uses pin 34 for Rx
  • Pinout
  1. GND
  2. RTS (Not used)
  3. 5V Connects to J5 on Rev 3
  4. RX (from External FTDI to ESP32 card)
  5. TX (from ESP32 card to External FTDI)
  6. CTS (Not used)
  RX2    => GPIO34
  TX2    => GPIO2

J4 - SD Card - Revs 2, 3

  • Brought to GVS header pins (Rev 1)
  • Brought to SD Card (Rev 2)
  MOSI  => GPIO17
  MISO  => GPIO16
  CLK   => GPIO14
  CS    => GPIO13

J5 - Power out

  • Powers external 3.3 interfaces
    • Used for external RS-232 cards
    • Don't install jumpers if external FTDI interface is used
  • Install shunt/jumper at F1PWR to connect FTDI #1 pin J2-2 to +3.3V
  • Install shunt/jumper at F2PWR to connect FTDI #2 pin J3-2 to +3.3V

J5 Rev3.PNG

VGA - Resistor Selection

  • ESP32 has a 3.3V driver which can drive more than 10 mA
  • Ideal case drive current
    • 0.7V (full scale VGA level) into 75 Ohms = 9.33 mA
    • 2/3 of the current or 6.16 mA comes from the lower value resistor (digital most significant bit)
    • 1/3 of the current or 3.08 mA comes from the higher value resistor (digital least significant bit)
  • R-2R values
  • Voltage steps are:

VGA Sim 2R Voltage.PNG

  • Current steps are:

VGA Sim 2R Current.PNG

FabGL GPIOs assignment summary - fabgl dev board rev2

From here


I2C (not usable with VGA)

  SDA   => GPIO4  (conflicts with VGA B1)
  SCL   => GPIO15 (conflicts with VGA VSync)

SPI Display - VSPI (not usable with VGA)

  CLK   => GPIO18 (conflicts with VGA G1)
  MISO  => GPIO19 (conflicts with VGA G0)
  MOSI  => GPIO23 (conflicts with VGA HSync)
  CS    => GPIO5  (conflicts with VGA B0)
  D/C   => GPIO22 (conflicts with VGA R0)
  RESET => GPIO21 (conflicts with VGA R1)

Software

FabGL

  • Display Controller features/applications
    • VGA
    • SSD1306
    • PS/2 Mouse and Keyboard Controller
    • Graphics Library
    • Sound Engine
    • Game Engine
    • ANSI/VT Terminal for the ESP32

FabGL Libraries

FabGL Arduino library

Installing the released library

FabGL Library.PNG

Using Latest FabGL builds

  • Fabrizio does a nice job of keeping his Arduino libraries up to date but if you want a bleeding edge experience, you can download his code from GitHub. Note, he's in active development so things often change.

Here's how I did it

  1. Install drivers via Arduino from the Library Manager. These are not the latest files. Space Invaders should run but not have sound (as of now because it's the older version).
  2. Move the FabGL from the Arduino libraries file folder to the desktop.
  3. Copy the FabGL from the GitHub download to the Arduino files folder (where you removed the other folder).
  4. Examples will now be the latest.
  5. Compile/download/test the new files. You know it works if you now get sound from Space Invaders.
  6. Save as where you would normally save your Arduino sketches.

Arduino Programming

  • If you try to upload a new sketch to your ESP32 and you get this error message “A fatal error occurred: Failed to connect to ESP32: Timed out… Connecting…“. It means that your ESP32 is not in flashing/uploading mode.
  • Press the “Upload” button in the Arduino IDE to upload your sketch
  • After you see the “Connecting….” message in your Arduino IDE, release the finger from the “BOOT” button:

Ardino ESP32.png

MicroPython

ESP-IDF

Operating Systems

Schematic

Rev 2 Changes

ESP32-VGA CAD REV2-bw.PNG

  • Rev 1 board won't program or boot with FDTI #2 card attached
    • Earlier FabGL had GPIO12 instead of GPIO34
    • Move FTDI Rx line (GPIO12 to GPIO34)
  • Swap FTDI pins 4 and 5 (FTDI connectors)
    • Allow direct connect to FTDI card (no swap)
  • Add SD Card connector
    • MISO => GPIO 16
    • MOSI => GPIO 17
    • CLK => GPIO 14
    • CS => GPIO 13
    • Remove I/O pins from GVS connector
  • Replace H1/H2 with 1x2 to select/remove DC jack power\
  • Remove Polysilicone fuse
  • Change ESP32 board name silkscreen
  • Add SD card connector

Prototype

FabGL P905-512pxV.jpg

Assembly Sheet

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