MVM-VC

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RPi3/4 connections

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NanoPi connections

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ESP32 connections

Rev 2020mar31

ESP32 - WROOM32 - HUZZA32 - header - baseboard - function

"bottom row"

GPIO21 - IO21 - 21      - JP1-1  - A1  - CPU SPI CS (SPI)
U0TXD  - TXD0 - TX/17   - JP1-2  - A2  - FTHR CPU TX - N/C
U0RXD  - RXD0 - RX/16   - JP1-3  - A3  - FTHR CPU RX - N/C
GPIO19 - IO19 - MISO/19 - JP1-4  - A4  - CPU MISO (SPI)
GPIO18 - IO18 - MOSI/18 - JP1-5  - A5  - CPU MOSI (SPI)
GPIO5  - IO5  - SCK/5   - JP1-6  - A6  - CPU SCK (SPI)
GPIO4  - IO4/A2_0 - ADC2/A5/4    - JP1-7  - A7  - CPU DRV STAT4
SENSOR_VP C16/270pF - IO36/SEN_VP/A1_0 - ADC1/A4/36   - JP1-8  - A8  - CPU DRV STAT3
SENSOR_VN C17/270pF - IO39/SEN_VN/A1_3 - "input only" ADC1/A3/39   - JP1-9  - A9  - CPU DRV STAT2
VDET_1 - I34/A1_6 - "input only" ADC1/A2/34   - JP1-10 - A10 - CPU DRV STAT1
GPIO25 - IO25/DAC1/A2_8 - ADC2/A1/DAC1/25 - JP1-11 - A11 - N/C
GPIO26 - IO26/DAC2/A2_9 - ADC2/A0/DAC2/26 - JP1-12 - A12 - CPU BUZZ
none - none - GND     - JP1-13 - A13 - GND
none - none - NC      - JP1-14 - A14 - N/C
none - none - "3V"    - JP1-15 - A15 - "+3V_CPU2"
none - none -  RST    - JP1-16 - A16 - CPU RESET - N/C

"top row"

none - none - BAT    - JP3-1  - B1  - N/C
none - none - EN     - JP3-2  - B2  - N/C
none - none - USB    - JP3-3  - B3  - "+5V_USB"
MTCK - IO13/A2_4 - "red LED" ADC2/13/A12 - JP3-4  - B4  - CPU_LED1
MTDI - IO12/A2_5 - "internal pulldown, output only" ADC2/12/A11 - JP3-5  - B5  - CPU_LED2
GPIO27 - IO27/A2_7 - ADC2/27/A10 - JP3-6  - B6  - CPU DRV CH1
32K_XN - IO33/A1_5/X32N - ADC1/33/A9  - JP3-7  - B7  - CPU DRV CH2
MTDO   - IO15/A2_3 - ADC2/15/A8  - JP3-8  - B8  - CPU DRV CH3
32K_XP - IO32/A1_4/X32P - ADC1/32/A7  - JP3-9  - B9  - CPU DRV CH4
MTMS   - IO14/A2_6 - ADC2/14/A6  - JP3-10 - B10 - CPU DRV RSTn (output board reset)
GPIO22 - IO22 - SCL/22 - JP3-11 - B11 - CPU SCL (I2C)
GPIO23 - IO23 - SDA/23 - JP3-12 - B12 - CPU SDA (I2C)

not on header, internally connected on HUZZA32:

VDET_2 - I35/A1_7 - ADC1/35/A13 - N/C - VBAT voltmeter (through divider)

not clear what function:

GPIO0   - IO0/A2_1 - GPIO0 - serial RTS 
GPIO2   - IO2/A2_2 - GPIO2 - serial DTR (looks like mistake on schematic)
GPIO16  - IO16 - IO16 - not connected?
GPIO17  - IO17 - IO17 - not connected?
CHIP_PU - EN - RESET - push button

WROOM32 flash memory connection ("U3"):

SD_DATA_2 - SD2 - n/c
SD_DATA_3 - SD3 - n/c
SD_CMD - CMD - n/c
SD_CLK - CLK - n/c
SD_DATA_0 - SD0 - n/c
SD_DATA_1 - SD1 - n/c