MVM-IT

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Links

  • MVM-IT MVM with Italian baseboard
  • MVM-TR MVM with TRIUMF baseboard

General information

  • external power supply: 24 VDC screw terminals
    • regulated down to 5V USB power (+5V_USB) which is
    • regulated down to 3.3V (+3V_CPU)
  • 4 channels of relay drivers
  • 2 screw terminals (CPU_BUZZ/BUZZ and CPU_AUX/AUX1)
  • 2 screw terminals (CPU_LED1/AUX2 and CPU_LED2/AUX3)
  • connection for "featherwing 2.4in" display
  • 7 screw terminals for I2C (I2C 0..6)
  • 1 screw terminal for SPI (EXT_SPI_CS0)
  • 1 pressure sensor
  • 3 sites for microcontroller (only 1 at a time): Adafruit HUZZA32, NanoPi, RaspberryPi

Switches and Jumpers

  • JMP3/JMP4 - select +3V_CPU from our regulator or from ESP32 internal regulator
  • SW1/SW2/SW3/SW4 - select I2C power +3V_CPU or +5V_USB
  • JMP1_DRV1/JMP2_DRV1 (DRV1..DRV4) - select relay driver

Connectors

  • power: 24VDC two pin screw terminal
  • adafruit huzzah32 socket
  • nanopi socket
  • raspberry pi 3B socket (40 pin J8)
  • SPI: six pin screw teminal
  • I2C0..I2C6: four pin screw terminals. i2c switch port order is: SPI, I2C0, I2C1, ... I2C6
  • 4x two pin screw terminals: CPU_BUZZ, AUX1, AUX2, AUX3.

Test plan

Done:

  • ESP32 I2C communication with pressure sensor (standalone): [BS 2020apr2].
  • board powered 24V: [DB/BS 2020apr4]
  • ESP32 runs: [BS 2020apr4, KO 2020apr5]
  • RaspberryPi runs: [LM 2020apr5, KO 2020apr5]
  • ESP32 to RPi3 USB connection ok, ESP32 powered from USB or 24VDC ok, no crash when 24VDC power is cycled [KO 2020apr5]
  • ESP32 featherwing TFT display ok (standalone): [KO 2020apr5]
  • control and readback of relays (valves): ESP32 [BS 2020apr4], RPi [LM 2020apr5, KO 2020apr5]
  • I2C communication: ESP32 [BS 2020apr4], RPi [LM 2020apr5]
  • ESP32 Wifi radio works: [KO 2020apr5]
  • ESP32 Wifi communication: [BS 2020apr7]

Problems found:

  • SPI communication: ESP32 [BS 2020apr4], RPi [KO 2020apr9]

Partial:

  • Pressure sensor readout (I2C): ESP32 [BS 2020apr4], RPi [...]
  • flow meter readout (I2C): ESP32 [BS 2020apr7], RPi [...]
  • external I2C: ESP32 [BS 2020apr7], RPi [...]
  • BUZZ, AUX1: ESP32 [...], RPi [KO 2020apr4]
  • CPU DRV RSTn works: ESP32 [...], RPi [KO 2020apr9]

Pending:

  • AUX2, AUX3: ESP32 [...], RPi [...]
  • featherwing display: ESP32 [...], RPi [...]
  • proportional valve control (DAC): ESP32 [...]
  • proportional valve control (PWM): ESP32 [...], RPi [...]
  • RPi Wifi client: [...]
  • RPi Wifi hotspot: [...]
  • RPi touch screen: [...]

System configurations permitted by hardware

  • "Italian model": [ MVM-VC + ESP32 ] ---- usb-serial ---- [ RPi3 + GUI ] (remote control) ---- wifi or cat5 or SD/USB flash for data collection
  • "one ESP32": [ MVM-VC + ESP32 + small LCD + mini-GUI ] ---- wifi for data collection (no cat5, no SDflash)
  • "one Pi": [ MVM-VC + RPi + GUI ] ---- wifi or cat5 or SD/USB flash for data collection
  • "two Pi": [ MVM-VC + RPi/NanoPi ] ---- cat5 ---- [ RPi + GUI ] ---- wifi or SD/USB flash for data collection
  • "three Pi": [ MVM-VC + RPi/NanoPi (control) ---???--- RPi + GUI (local control) ] ---???--- [ RPi + GUI ] (remote control)
  • "2.5 Pi": [ MVM-VC + ESP32 --- usb-serial --- RPi + GUI (local control) ] ---- cat5 ---- [ RPi + GUI ] (remote control)

Notable hardware limitations:

  • MVM-VC can be fully operated by ESP32 or RPi or NanoPi (not at the same time)
  • ESP32: yes wifi, no cat5 ethernet, no usb, no sd flash (sd flash maybe via adafruit LCD "feather")
  • NanoPi: maybe wifi, maybe HDMI/DP connector to drive monitor (NanoPi to be confirmed)
  • RPi is the most capable: cat5/rj45 ethernet, wifi, HDMI/DP, USB, SD flash slot.

Abbreviations: MVM-VC - TRIUMF PCB, ESP32 - adafruit HUZZA32/WROOM32/ESP32 icrocontroller, RPi - RaspberryPi, NanoPi - NanoPi, GUI - medium size LCD running the MVM python GUI, mini-GUI - small size LCD running minimal GUI coded in ESP32.

ESP32 connections

!!! ALL GPIO PINS are 3.3V, NOT 5V safe !!!

ESP32 - link to the ESP32 page

  • Pinouts Rev 2020apr5
ESP32 pin and name - WROOM32 - HUZZA32 - header - baseboard - function

"bottom row"

42 - GPIO21 - IO21 - 21      - JP1-1  - A1  - CPU SPI CS (SPI) - (output) SPI nCS - mux GPIO21 or VSPIHD
41 - U0TXD  - TXD0 - TX/17   - JP1-2  - A2  - FTHR CPU TX - N/C - mux GPIO1 or U0TXD
40 - U0RXD  - RXD0 - RX/16   - JP1-3  - A3  - FTHR CPU RX - N/C - mux GPIO3 or U0RXD
38 - GPIO19 - IO19 - MISO/19 - JP1-4  - A4  - CPU MISO (SPI) - (input) SPI MISO - mux GPIO19 or U0CTS or VSPIQ
35 - GPIO18 - IO18 - MOSI/18 - JP1-5  - A5  - CPU MOSI (SPI) - (output) SPI MOSI - mux GPIO18 or VSPICLK
34 - GPIO5  - IO5  - SCK/5   - JP1-6  - A6  - CPU SCK (SPI) - (output) SPI CLK - mux GPIO5 or VSPICS0
24 - GPIO4  - IO4/A2_0 - ADC2/A5/4    - JP1-7  - A7  - CPU DRV STAT4 - (open drain 3.3V input) - mux GPIO4 or RTC_GPIO10
 5 - SENSOR_VP C16/270pF - IO36/SEN_VP/A1_0 - ADC1/A4/36   - JP1-8  - A8  - CPU DRV STAT3 - (same) - mux GPIO36 or RTC_GPIO0 (input only)
 8 - SENSOR_VN C17/270pF - IO39/SEN_VN/A1_3 - ADC1/A3/39   - JP1-9  - A9  - CPU DRV STAT2 - (same) - mux GPIO39 or RTC_GPIO3 (input only)
10 - VDET_1 - I34/A1_6 - "input only" ADC1/A2/34   - JP1-10 - A10 - CPU DRV STAT1 - (same) - mux GPIO34 or RTC_GPIO4 (input only)
14 - GPIO25 - IO25/DAC1/A2_8 - ADC2/A1/DAC1/25 - JP1-11 - A11 - N/C - reserved for DAC output - mux GPIO25 or RTC_GPIO6 or DAC1
15 - GPIO26 - IO26/DAC2/A2_9 - ADC2/A0/DAC2/26 - JP1-12 - A12 - CPU BUZZ - (maybe output) direct connection to BUZZ screw terminal - mux GPIO26 or RTC_GPIO7 or DAC2
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"
20 - MTCK   - IO13/A2_4 - "red LED" ADC2/13/A12 - JP3-4  - B4  - CPU_LED1 - (output) drives open-drain 3.3V AUX2 - mux GPIO13 or RTC_GPIO14
18 - MTDI   - IO12/A2_5 - "internal pulldown, output only" ADC2/12/A11 - JP3-5  - B5  - CPU_LED2 - (output) same, AUX3 - mux GPIO12 or RTC_GPIO15 - "boot fail if pulled high"
16 - GPIO27 - IO27/A2_7 - ADC2/27/A10 - JP3-6  - B6  - CPU DRV CH1 - (output) drives buffer - mux GPIO27 or RTC_GPIO17
13 - 32K_XN - IO33/A1_5/X32N - ADC1/33/A9  - JP3-7  - B7  - CPU DRV CH2 - (same) - mux GPIO33 or RTC_GPIO8
21 - MTDO   - IO15/A2_3 - ADC2/15/A8  - JP3-8  - B8  - CPU DRV CH3 - (same) - mux GPIO15 or RTC_GPIO13
12 - 32K_XP - IO32/A1_4/X32P - ADC1/32/A7  - JP3-9  - B9  - CPU DRV CH4 - (same) - mux GPIO32 or RTC_GPIO9
17 - MTMS   - IO14/A2_6 - ADC2/14/A6  - JP3-10 - B10 - CPU DRV RSTn - (output, pull up to 3.3V) drives nRESET of I2C and SPI chips, mux GPIO14 or RTC_GPIO16
39 - GPIO22 - IO22 - SCL/22 - JP3-11 - B11 - CPU SCL - (I2C, pull up to 3.3V) - mux GPIO22 or U0RTS
36 - GPIO23 - IO23 - SDA/23 - JP3-12 - B12 - CPU SDA - (I2C, pull up to 3.3V) - mux GPIO23

not on header, internally connected on HUZZA32:

11 - VDET_2 - I35/A1_7 - ADC1/35/A13 - N/C - VBAT voltmeter (through divider) - mux GPIO35 or ADC1_CH7 or RTC_GPIO5 (input only)

not clear what function:

23 - GPIO0   - IO0/A2_1 - GPIO0 - serial RTS - mux GPIO0 or RTC_GPIO11
22 - GPIO2   - IO2/A2_2 - GPIO2 - serial DTR (looks like mistake on schematic) - mux GPIO2 or RTC_GPIO12
25 - GPIO16  - IO16 - IO16 - not connected? - mux GPIO16 or U2RXD
27 - GPIO17  - IO17 - IO17 - not connected? - mux GPIO17 or U2TXD
 9 - CHIP_PU - EN - RESET - push button - no mux

WROOM32 flash memory connection ("U3"):

28 - SD_DATA_2 - SD2 - n/c - mux SD_DATA2 or GPIO9
29 - SD_DATA_3 - SD3 - n/c - mux SD_DATA3 or GPIO10
30 - SD_CMD - CMD - n/c - mux SD_CMD or GPIO11
31 - SD_CLK - CLK - n/c - mux SD_CLK or GPIO6
32 - SD_DATA_0 - SD0 - n/c - mux SD_DATA0 or GPIO7
33 - SD_DATA_1 - SD1 - n/c - mux SD_DATA1 or GPIO8

Not connected to ESP32:

CPU AUX - (maybe output) direct connection to AUX screw terminal

Note:
- I2C controller can use any/all GPIO pins
- SPI controller can use any/all GPIO pins

I2C addresses

To probe the pressure sensor: 

$ i2cset -y 1 0x70 0 0x80
$ i2cget -y 1 0x70 
0x80
$ i2cdetect -y 1 ### detects: 0x70 (switch) and 0x76 (pressure sensor)
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: 70 -- -- -- -- -- 76 --

Pressure sensor

Calibration constants (chip on KO's board):

read by i2cget (addr 0xa0 through 0xae) 

pi@raspberrypi:~ $ i2cget -y 1 0x76 0xa0 w
0x0100

read by sensors.exe (branch dev-linux) 

pressure sensor PROM 0x00: 0x0001
pressure sensor PROM 0x01: 0x392b
pressure sensor PROM 0x02: 0x1e52
pressure sensor PROM 0x03: 0x0e25
pressure sensor PROM 0x04: 0x071a
pressure sensor PROM 0x05: 0x943d
pressure sensor PROM 0x06: 0x1f6b
pressure sensor PROM 0x07: 0x000c
mvm_hal_init: PS1 CRC4 OK!
  • read ADC, no conversion
root@raspberrypi:~/i2c-tools-4.1/tools# ./i2cget3 -y 1 0x76 0
write returned 1
read returned 4, value 0x3f000000
  • read ADC, pressure
i2cset -y 1 0x76 0x48
root@raspberrypi:~/i2c-tools-4.1/tools# ./i2cget3 -y 1 0x76 0
write returned 1
read returned 4, value 0x3f900a44
  • read ADC, temperature
i2cset -y 1 0x76 0x58
root@raspberrypi:~/i2c-tools-4.1/tools# ./i2cget3 -y 1 0x76 0
write returned 1
read returned 4, value 0x3f9c424d

Flow sensor

TBW

Proportional Valve Italian firmware

  • From Bryerton:
The Italian's use the PWM on DAC1 / A0 / IO25 pin. The API is the ledc API used to control an LED via PWM
  • see ArduinoCorePP_PWM_hw_v3.ino
    • function setup() attach pin "DAC1" to ledc
ledcSetup(0, 10000, 12); // KO: chan 0, freq in kHz, how many bits of PWM 12 bits = range 0..4095
ledcAttachPin(DAC1, 0); // KO: IO25/A0/DAC1
ledcWrite(0, 0);
    • function PressureControlLoop_PRESSIN() see ledcWrite()
if (Pset == 0) {
  ledcWrite(0, 0);
} else {
  pid_outb = ...; // KO: looks like a digital PID controller
  if (pid_outb<0) pid_outb=0; // KO: low limit
  pid_outb = pid_outb + 500; // KO: what is this?!?
  if (pid_outb>4090) pid_outb=4090; // KO: high limit
  ledcWrite(0, pid_outb); // KO: value 500..4090
}
    • also see valve_control() commented absent code for PWM.

MVM-GUI

Install

  • as root:
    • apt-get update
    • apt-get install python3-pyqt5 python3-numpy python3-pyqtgraph python3-serial
    • ### does not work, installs wrong pip: apt-get install python3-pip
    • curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
    • python3 get-pip.py --force-reinstall
    • ### does not work, installs too-old version of yaml 3.13: apt-get install python3-yaml
    • pip3 install PyYAML ### version 5.3.1

Run with python simulator

  • cd gui
  • ./mvm_gui.py fakeESP32

Run with ESP32 simulator

  • load the ardiuno sketch mock/mock.ino into ESP32 (see instructions below)
  • ./mvm_gui.py ### default connection is /dev/ttyUSB0 at 115200 bps, change it in default_settings.yaml

MVM-Firmware

Prepare

Build and Flash

Connect and Use

  • use Ardiuno tools -> serial console, set: serial 115200
  • or use minicom, set /dev/ttyUSB0, 115200 bps, no flow control
  • output on a base esp32 (no baseboard, no hardware, no sensors, etc)
ets Jun  8 2016 00:22:57

rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0018,len:4
load:0x3fff001c,len:1044
load:0x40078000,len:8896
load:0x40080400,len:5816
entry 0x400806ac
SCAN I2C BUS: 0
Scanning... I2C
No I2C devices found

SCAN I2C BUS: 1
Scanning... I2C
No I2C devices found

SCAN I2C BUS: 2
Scanning... I2C
No I2C devices found

SCAN I2C BUS: 3
Scanning... I2C
No I2C devices found

SCAN I2C BUS: 4
Scanning... I2C
No I2C devices found

SCAN I2C BUS: 5
Scanning... I2C
No I2C devices found

SCAN I2C BUS: 6
Scanning... I2C
No I2C devices found

SCAN I2C BUS: 7
Scanning... I2C
No I2C devices found

SENSOR:           0
SENS_T1:          65535
OFF_T1:           65535
TCS:              65535
TCO:              65535
TREF:             65535
TEMPSENS:         65535
OFFSET:            0.00
SENSOR:           1
SENS_T1:          65535
OFF_T1:           65535
TCS:              65535
TCO:              65535
TREF:             65535
TEMPSENS:         65535
OFFSET:            0.00
SENSOR:           2
SENS_T1:          65535
OFF_T1:           65535
TCS:              65535
TCO:              65535
TREF:             65535
TEMPSENS:         65535
OFFSET:            0.00
SENSOR:           3
SENS_T1:          65535
OFF_T1:           65535
TCS:              65535
TCO:              65535
TREF:             65535
TEMPSENS:         65535
OFFSET:            0.00
SFM driver version 0.1.0
SFM sensor probing failed
...
Measure Flow Sensor initialized!
  • send: "get all", reply: "valore=0.00,0.00,0,0,0,0,0,0,1"

Commands

  • aaa

End

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